Hepatoprotective Effect of Curcumin on Hepatocellular Carcinoma Through Autophagic and Apoptic Pathways

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"documento" => "article" "crossmark" => 0 "licencia" => "http://creativecommons.org/licenses/by-nc-nd/4.0/" "subdocumento" => "fla" "cita" => "Ann Hepatol. 2017;16:599-606" "abierto" => array:3 [ "ES" => true "ES2" => true "LATM" => true ] "gratuito" => true "lecturas" => array:2 [ "total" => 97 "formatos" => array:3 [ "EPUB" => 17 "HTML" => 48 "PDF" => 32 ] ] "en" => array:11 [ "idiomaDefecto" => true "titulo" => "Hepatic Echinococcosis with Thoracic Involvement. Clinical Characteristics of a Prospective Series of Cases" "tienePdf" => "en" "tieneTextoCompleto" => "en" "tieneResumen" => "en" "paginas" => array:1 [ 0 => array:2 [ "paginaInicial" => "599" "paginaFinal" => "606" ] ] "contieneResumen" => array:1 [ "en" => true ] "contieneTextoCompleto" => array:1 [ "en" => true ] "contienePdf" => array:1 [ "en" => true ] "resumenGrafico" => array:2 [ "original" => 0 "multimedia" => array:7 [ "identificador" => "f0015" "etiqueta" => "Figure 2" "tipo" => "MULTIMEDIAFIGURA" "mostrarFloat" => true "mostrarDisplay" => false "figura" => array:1 [ 0 => array:4 [ "imagen" => "gr2.jpeg" "Alto" => 1182 "Ancho" => 2074 "Tamanyo" => 247291 ] ] "descripcion" => array:1 [ "en" => "Anatomic-surgical lesions of TIHE. A. Adhered cyst (n = 11). There are strong adhesions between the cyst surface and the diaphragm, but without rupture of him. Equivalent to Grade I of the proposal by Gómez, et al. B. Hydatid transit (n = 12). Cyst perforates the diaphragm invading the thoracic cavity. The diaphragmatic defect needs repair. Equivalent to Grade I of the proposal by Gómez, et al. C. Hydatid pleura without bronchial rupture (n = 4). Vesiculation inside the thoracic pleura. Cyst perforates the diaphragm and grows inside the chest, with or without implant of daughter vesicles. Equivalent to Grade III of the proposal by Gómez, et al. D. Hydatid pleura with rupture a bronchus (n = 4). Parenchymal lung disease occurs (e.g. atelectasis). Cyst is connected to the bronchial tree. Partially equivalent to Grade IV of proposal by Gómez, et al. E. Hydatid pleura with rupture of the biliary tract (n = 3). Cyst perforates the diaphragm and grows inside the thoracic cavity, with or without implant of daughter vesicles. Furthermore, the cyst communicates with the bile duct, causing or not cholangiohydatidosis, with or without secondary cholangitis. F. Pleural-cystic-biliary fistula (n = 3). There is parenchymal lung disease. Cyst is connected to the bronchial tree (as a chronic bronchial fistula) and the bile duct. Partially equivalent to grade V of the proposal by Gómez, et al." ] ] ] "autores" => array:1 [ 0 => array:2 [ "autoresLista" => "Carlos Manterola, Tamara Otzen" "autores" => array:2 [ 0 => array:2 [ "nombre" => "Carlos" "apellidos" => "Manterola" ] 1 => array:2 [ "nombre" => "Tamara" "apellidos" => "Otzen" ] ] ] ] ] "idiomaDefecto" => "en" "EPUB" => "https://multimedia.elsevier.es/PublicationsMultimediaV1/item/epub/S1665268119310981?idApp=UINPBA00004N" "url" => "/16652681/0000001600000004/v1_201906150930/S1665268119310981/v1_201906150930/en/main.assets" ] "en" => array:17 [ "idiomaDefecto" => true "titulo" => "Hepatoprotective Effect of Curcumin on Hepatocellular Carcinoma Through Autophagic and Apoptic Pathways" "tieneTextoCompleto" => true "paginas" => array:1 [ 0 => array:2 [ "paginaInicial" => "607" "paginaFinal" => "618" ] ] "autores" => array:1 [ 0 => array:4 [ "autoresLista" => "Ahmed M. Elmansi, Amro A. El-Karef, Mamdouh M. El-Shishtawy, Laila A. Eissa" "autores" => array:4 [ 0 => array:3 [ "nombre" => "Ahmed M." "apellidos" => "Elmansi" "referencia" => array:1 [ 0 => array:2 [ "etiqueta" => "*" "identificador" => "aff1" ] ] ] 1 => array:3 [ "nombre" => "Amro A." "apellidos" => "El-Karef" "referencia" => array:1 [ 0 => array:2 [ "etiqueta" => "**" "identificador" => "aff2" ] ] ] 2 => array:4 [ "nombre" => "Mamdouh M." "apellidos" => "El-Shishtawy" "email" => array:1 [ 0 => "mshisht@mans.edu.eg" ] "referencia" => array:2 [ 0 => array:2 [ "etiqueta" => "*" "identificador" => "aff1" ] 1 => array:2 [ "etiqueta" => "*" "identificador" => "cor1" ] ] ] 3 => array:3 [ "nombre" => "Laila A." "apellidos" => "Eissa" "referencia" => array:1 [ 0 => array:2 [ "etiqueta" => "*" "identificador" => "aff1" ] ] ] ] "afiliaciones" => array:2 [ 0 => array:3 [ "entidad" => "Department of Biochemistry, Faculty of Pharmacy, Mansoura University, Mansoura, Egypt" "etiqueta" => "*" "identificador" => "aff1" ] 1 => array:3 [ "entidad" => "Department of Pathology, Faculty of Medicine, Mansoura University, Mansoura, Egypt" "etiqueta" => "**" "identificador" => "aff2" ] ] "correspondencia" => array:1 [ 0 => array:3 [ "identificador" => "cor1" "etiqueta" => "*" "correspondencia" => "Correspondence and reprint request:" ] ] ] ] "resumenGrafico" => array:2 [ "original" => 0 "multimedia" => array:7 [ "identificador" => "f0055" "etiqueta" => "Figure 10" "tipo" => "MULTIMEDIAFIGURA" "mostrarFloat" => true "mostrarDisplay" => false "figura" => array:1 [ 0 => array:4 [ "imagen" => "gr10.jpeg" "Alto" => 709 "Ancho" => 942 "Tamanyo" => 49459 ] ] "descripcion" => array:1 [ "en" => "Effect of Cur low-dose (100 mg/kg) and Cur high-dose (200 mg/kg) on Bcl-2 gene expression levels (mean ± SE) in Thioacetamide (200 mg/kg) induced HCC. * Significant against control group at P < 0.05. # Significant against TAA group at P < 0.05. † Significant against Cur low-dose group at P < 0.05." ] ] ] "textoCompleto" => "IntroductionHepatocellular carcinoma (HCC) comes in the third place as the most leading cause of cancer mortality all over the world and in the sixth place as the most frequently diagnosed cancer. HCC usually progresses from chronic hepatitis, to cirrhosis, to dysplastic nodules (low- and high-grade), to malignant tumors.<a class="elsevierStyleCrossRef" href="#bib0010">1</a>,<a class="elsevierStyleCrossRef" href="#bib0015">2</a>Curcumin derived from the plant Curcuma longa, is a gold-colored spice commonly used in the Indian subcontinent. Curcumin has been shown to exhibit antioxidant, anti-inflammatory, antiviral, antibacterial, antifungal, and anticancer activities and thus has a potential protective role against various malignant diseases, diabetes, allergies, arthritis, Alzheimer's disease, and other chronic illnesses.It has also been shown to induce cell death in apoptosis resistant cancer cells.<a class="elsevierStyleCrossRef" href="#bib0020">3</a>,<a class="elsevierStyleCrossRef" href="#bib0025">4</a>Autophagy is an evolutionarily conserved self-digestive mechanism, which involves many steps.<a class="elsevierStyleCrossRef" href="#bib0030">5</a> These steps include: aggregation of double-membrane, formation of autophagosome that engulfs the targeted region, its fusion with lysosomes and digestion in autolysosomes. Under starvation or other stresses, autophagy is required for cell survival to eliminate the damaged cellular components and to maintain nutrition and energy homeostasis. Therefore, autophagy has a close relationship with many biological or pathological phenomena including carcinogenesis. Many recent studies have indicated that autophagy has a tumor-suppressive function.<a class="elsevierStyleCrossRef" href="#bib0015">2</a>,<a class="elsevierStyleCrossRef" href="#bib0035">6</a> Besides tumor-suppressive function; autophagy has been reported to promote tumor development. Many recent studies have revealed that autophagy was essential for oncogene-mediated tumorigenesis,<a class="elsevierStyleCrossRef" href="#bib0040">7</a> which seemingly raises a paradox. However, autophagy probably has different roles in different stages of tumor development, which is a multistep and complicated process.<a class="elsevierStyleCrossRef" href="#bib0015">2</a>,<a class="elsevierStyleCrossRef" href="#bib0045">8</a>,<a class="elsevierStyleCrossRef" href="#bib0050">9</a>Microtubule-associated protein light chain 3 is a protein involved in the autophagy process, and exists in either of two forms, a cytosolic form (18 kDa, LC3-I) and membrane-bound form (16 kDa, LC3-II) which results from proteolysis and lipid modification of LC3-I. Since LC3-I is processed into LC3-II which in turn is incorporated into autophagosomal membranes during autophagy, the accumulation of LC3-II is considered as one of the markers of autophagy induction.<a class="elsevierStyleCrossRef" href="#bib0055">10</a>In addition to LC3, SQSTM1 is another autophagy specific substrate, since it has been reported to directly bind to LC3, incorporate into autophagosome, and finally degrade by autophagy. For example, in autophagy-deficient cells, autophagy-inducing stimulus such as starvation failed to reduce SQSTM1 expression. Therefore, SQSTM1 expression level is inversely correlated with autophagic activity.<a class="elsevierStyleCrossRef" href="#bib0060">11</a>Bcl-2 protein is one of the Bcl-2 proteins family that includes both pro- and anti-apoptic proteins. Bcl-2 belongs to the anti-apoptic group that down regulates autophagy through inhibiting other pro-apoptic members of the same family. Besides inactivation of pro-apoptotic Bcl-2 family proteins, the presence of elevated levels of anti-apoptotic family members is an obvious mechanism of apoptosis dysregulation in cancer.<a class="elsevierStyleCrossRef" href="#bib0065">12</a>,<a class="elsevierStyleCrossRef" href="#bib0070">13</a>Material and MethodsA in vitro StudyCell LineThe HepG2 cell line was purchased from The Holding Company for Biological Products & Vaccines (Vacsera, Cairo, Egypt), where the HepG2 cells were examined for identity and absence of bacteria, mycoplasma and viruses.HepG2 cells were grown in Dulbecco's Modified Eagle's medium supplemented with 10% fetal bovine serum and 1% streptomycin and penicillin, and incubated for 24 h at 37 °C in a 5% CO2 incubator to allow the cells to grow.MTT Assay1 x 104 cells were plated in each well of 96-well plate, and were placed in the humidified 5% CO2 incubator at 37 °C to allow them to grow for 24 h period. Cells were transferred to serum-free medium and exposed to different concentrations of curcumin (5, 10, 20, 40, and 50 μM) and another two combinations were made between curcumin 50 μM and N-Acetyl Cysteine (NAC) (Sigma-Aldrich, St. Louis, MO, USA), and between curcumin 50 μM with hydrogen peroxide (El-Gomhouria Co., Cairo, Egypt) and placed in the humidified 5% CO2 incubator for 24 h for evaluation.In vivo StudyAnimals and their treatment outlinesThe animal protocol was approved by ethical committee in Faculty of Pharmacy, Mansoura University (proto-col code No. 2012-32) Mansoura, Egypt, in accordance with “Principles of Laboratory Animal Care” (NIH publi-cation No. 85-23, revised 1985). 66 Male Sprague Dawely rats weighing 180-200 g were used. All animals in the study were maintained under standard conditions of temperature 25 ± 2 °C, with regular 12 h light/12 h dark cycle and allowed free access to food and water. Rats were divided into 4 groups:<ul class="elsevierStyleList" id="l0010"><li class="elsevierStyleListItem" id="u0010">•Control group (10 rats). Rats received corn oil through oral gavage and served as a negative control group throughout the study.</li><li class="elsevierStyleListItem" id="u0015">•TAA group (24 rats). Rats were injected with thioacetamide (TAA) (Sigma-Aldrich, St. Louis, MO, USA) at a dose of 200 mg/kg, intraperitoneal (i.p.) twice per week for 18 weeks.<a class="elsevierStyleCrossRef" href="#bib0075">14</a></li><li class="elsevierStyleListItem" id="u0020">•Curcumin low-dose (Cur low-dose) group and Curcumin high-dose (Cur high-dose) group (16 rats each).</li></ul>The two groups received curcumin 100 mg/kg,<a class="elsevierStyleCrossRef" href="#bib0080">15</a> and 200 mg/kg<a class="elsevierStyleCrossRef" href="#bib0085">16</a> daily, respectively, by oral gavage throughout the whole study and were injected with TAA (200 mg/kg, i.p.) twice per week for 18 weeks starting from the second week after administration of curcumin.Collection of samplesAfter the experimental period, rats were fasted overnight then blood samples were taken from the heart under diethyl ether anesthesia. The clotted blood samples were centrifuged at 5,000 rpm for 5 min for serum separation. Serum was divided into aliquots for biochemical analysis. Rats were sacrificed by decapitation; the whole liver was dissected, and immersed in ice-cold saline. A small part from right lobe of liver was cut and fixed in 10% phosphate-buffered formalin (pH 7.2) for histopathological examination. The remaining liver was kept in liquid nitrogen for subsequent analysis. It was then homogenized in 10-fold volume of ice-cold sodium potassium phosphate buffer (0.01 M, pH 7.4) containing 1.15% KCl. The homogenates were centrifuged at 600 x g for 10 min at 4 °C, and the supernatant was stored at -80 °C.Histopathological analysis of hepatic tissuePhosphate buffered formalin-fixed liver tissues were embedded in paraffin, cut into 5 μm thick sections and stained with hematoxylin and eosin (H&E) and Masson's trichrome for histopathological examination.Hepatic specimens were anonymously coded and examined in a masked manner.Liver function testsSerum alanine aminotransferase (ALT) and aspartate aminotransferase (AST) activities and albumin and AFP concentrations were measured by the standard methodologies using commercially available kits provided by Bio-diagnostic Company (Dokki, Giza, Egypt).Assessment of oxidative stressIt was estimated through determination of hepatic malondialdhyde (MDA) concentration, and hepatic superoxide dismutase (SOD) activity using commercially available kits provided by Biodiagnostic Company (Dokki, Giza, Egypt).Determination of SQSTM1 concentrationThe concentration of biochemical parameter SQSTM1 in the liver, and in HepG2 cells were measured by ELISA using a commercially available SQSTM1 (Enzo life sciences, NY, USA) in accordance with the manufacturer's instructions.Gene expression of LC3-II, and Bcl-2 by quantitative real-time polymerase chain reaction (RT-PCR)Total RNA for LC3-II, Bcl-2, and Glyceraldehyde 3-phosphate dehydrogenase (GAPDH) was isolated from euthanized rat liver using GF-1 total RNA extraction kit (Vivantis, Malaysia). One microgram of total RNA was reverse transcribed into single-stranded complementary DNA by using FastQuant RT Kit (with gDNase) (Tain-gen, China). Bcl-2 and LC3-II mRNA levels in different rat liver tissues were determined using Maxima SYBR Green/Fluorescein qPCR Master Mix by Rotor-Gene Q (Qiagen, USA). In the meanwhile, rat GAPDH was used as a housekeeping gene and an internal reference control. Gene-specific PCR primers (<a class="elsevierStyleCrossRef" href="#t0010">Table 1</a>) were obtained using Primer Express 3.0 (Applied Biosystems, USA), and GAP-DH gene sequences were obtained from previous studies.<a class="elsevierStyleCrossRef" href="#bib0090">17</a><elsevierMultimedia ident="t0010"></elsevierMultimedia>Statistical analysisFor descriptive statistics of quantitative variables, the mean ± standard error was used. One-way analysis of variance (ANOVA) was used to compare means between groups. Rats’ survival was estimated using the Kaplan-Meier method. Statistical computations were done on a personal computer using the computer software Prism 6. Statistical significance was predefined as P < 0.05.RESULTSEffect of Curcumin low-dose and Curcumin high-dose on survival percentThe survival percent of rats was 33% in TAA group (<a class="elsevierStyleCrossRef" href="#f0010">Figure 1</a>). Cur low-dose showed an increase in animal survival percent to 50%, while Cur high-dose showed an increase in animal survival percent to 62.5%.<elsevierMultimedia ident="f0010"></elsevierMultimedia>Regarding in vitro studies, treatment with Curcumin showed a significant reduction in the viability of HepG2 cells only with 50 μM dose (<a class="elsevierStyleCrossRef" href="#f0015">Figure 2</a>).<elsevierMultimedia ident="f0015"></elsevierMultimedia>Hepatoprotective effect of Curcumin low-dose and Curcumin high-dose in HCC induced by TAA in ratsNext, we examined the hepatoprotective effect of curcumin against HCC induced by TAA in vivo. TAA rats showed 2.7- and 2.1-fold significant increase in serum ALT, and AST activities, respectively, while Cur low-dose and Cur high-dose groups showed a significant decrease in ALT, and AST activities from TAA group (<a class="elsevierStyleCrossRef" href="#t0015">Table 2</a>). TAA group also showed a 17% significant reduction in serum albumin level in TAA group as compared with the control group, with only Cur high-dose group showing a significant increase in serum albumin level from TAA group (<a class="elsevierStyleCrossRef" href="#t0015">Table 2</a>).<elsevierMultimedia ident="t0015"></elsevierMultimedia>We also found 1.5-fold increase in serum AFP in TAA group as compared to control group (<a class="elsevierStyleCrossRef" href="#f0020">Figure 3</a>). Both curcumin groups blocked the increase in serum AFP level in TAA group.<elsevierMultimedia ident="f0020"></elsevierMultimedia>In addition, liver sections stained with H/E showed marked necroinflammatory changes with dysplastic nodules. However, sections from curcumin groups showed nearly normal appearance of hepatic lobule, with liver sections from Cur high-dose group (200 mg/kg daily) showing more improvement than Cur low-dose (100 mg/ kg daily), while liver sections stained with Masson Trichrome showed marked collagen deposition with complete cirrhosis in TAA group with less collagen deposition in Cur high-dose group than Cur low-dose group (<a class="elsevierStyleCrossRef" href="#f0025">Figure 4</a>).<elsevierMultimedia ident="f0025"></elsevierMultimedia>Oxidative stress markersIt is known that the oxidative stress status has a key role in HCC development and progression. We found 0.7-fold significant decrease in hepatic SOD activity (<a class="elsevierStyleCrossRef" href="#f0030">Figure 5</a>), and 1.3-fold significant increase in hepatic MDA levels (<a class="elsevierStyleCrossRef" href="#f0035">Figure 6</a>) in TAA group as compared with the control group.<elsevierMultimedia ident="f0030"></elsevierMultimedia><elsevierMultimedia ident="f0035"></elsevierMultimedia>Rats in Cur low-dose group showed significant reduction to the elevated MDA levels in TAA group, and significant increase to the reduced SOD activity in TAA group. Rats in Cur high-dose group did not show a significant change from TAA group in both oxidative stress markers.Effect of Curcumin low-dose and Curcumin high-dose on autophagic and apoptic pathwayAs shown in <a class="elsevierStyleCrossRef" href="#f0040">figure 7</a>, TAA group showed non-significant increase in SQSTM1 concentration when compared with control group. Cur low-dose group showed significant decrease in SQSTM1 concentration compared with control group, and showed significant increase in LC3-II hepatic gene expression levels compared with control group. Cur high-dose group showed non-significant decrease in SQSTM1 concentration and significant increase in LC3-II gene expression levels from control group as shown in <a class="elsevierStyleCrossRef" href="#f0045">figure 8</a>. In addition, treatment of HepG2 cells with curcumin caused a significant decrease in SQSTM1 (<a class="elsevierStyleCrossRef" href="#f0050">Figure 9</a>).<elsevierMultimedia ident="f0040"></elsevierMultimedia><elsevierMultimedia ident="f0045"></elsevierMultimedia><elsevierMultimedia ident="f0050"></elsevierMultimedia>Curcumin also showed significant increase in Bcl-2 gene expression levels in both concentrations (<a class="elsevierStyleCrossRef" href="#f0055">Figure 10</a>), a gene that is known to inhibit apoptosis, which means that curcumin had an inhibitory effect on apoptosis in this study. Moreover the effect of curcumin in induction of autophagy in both doses was highly correlated with the inhibitory effect on apoptosis for each dose.<elsevierMultimedia ident="f0055"></elsevierMultimedia>The correlation analysis of studied parametersThe data in <a class="elsevierStyleCrossRef" href="#t0020">table 3</a>, and <a class="elsevierStyleCrossRef" href="#f0060">figure 11</a> show the correlation analysis of the studied parameters. LC3-II gene expression level is positively correlated with Bcl-2 gene expression level (0.745, P < 0.05), and negatively correlated with each of liver AFP level (-0.445, P < 0.05), serum MDA level (-0.662, P < 0.05), and hepatic SQSTM1 concentration (-0.451, P < 0.05). Bcl-2 gene expression level is negatively correlated with SQSTM1 concentration (-0.521, P < 0.05), and serum MDA level (-0.862, P < 0.05).<elsevierMultimedia ident="t0020"></elsevierMultimedia><elsevierMultimedia ident="f0060"></elsevierMultimedia>DiscussionThe role of autophagy induced by curcumin in protection and treatment of HCC was assayed in this study. Autophagy and apoptosis are both considered two different mechanisms for programmed cell death. In this study, we examined how curcumin affects both autophagy and apoptosis, and how they affect HCC prognosis. We are the first to investigate the effect of curcumin on both autophagy and apoptosis in TAA induced HCC, and to relate these effects to the concentration of ROS.The experimental model was designed to reach only the first dysplastic stage of HCC. This is because autophagy has been proved to have different and even contradicting effects on HCC prognosis in both the dysplastic and tumor-forming stages of HCC.<a class="elsevierStyleCrossRef" href="#bib0015">2</a> Cells in the late tumor stages are characterized from cells in the early stages in having higher metabolic activity, which leads to higher levels of ROS.<a class="elsevierStyleCrossRef" href="#bib0095">18</a>,<a class="elsevierStyleCrossRef" href="#bib0100">19</a> Based on that difference between the two stages, it was found that inhibiting autophagy leads to excessive ROS accumulation which leads to cell death by apoptosis, while in the dysplastic stage inhibiting autophagy was shown to lead to cell survival and cancer proliferation.<a class="elsevierStyleCrossRef" href="#bib0015">2</a>,<a class="elsevierStyleCrossRef" href="#bib0105">20</a> In our work, we aimed to investigate the hepatoprotective effect of activating autophagy in the dysplastic stage instead of inhibiting it in the late tumor-forming stage.To investigate the involvement of autophagic pathway in the mechanism of curcumin's effect, LC3-II gene expression, and SQSTM1 concentration were measured, and the results showed significant increase in LC3-II gene expression in Cur low-dose, and Cur high-dose groups. The results also showed significant decrease in SQSTM1 concentration with both curcumin doses. Our results also indicated that curcumin lead to significantly decreasing HepG2 cells viability in a dose of 50 μM. This dose also showed a significant decrease in SQSTM1 concentration. These results are in agreement with other studies that suggested that curcumin among other natural products leads to autophagic cell death.<a class="elsevierStyleCrossRefs" href="#bib0110">21</a>-<a class="elsevierStyleCrossRef" href="#bib0120">23</a>The results of measuring the anti-apoptic Bcl-2 gene expression showed that curcumin significantly inhibited apoptosis in both concentrations. A correlation study between curcumin's effect on both Bcl-2 gene expression levels, and LC3-II gene expression levels showed significant high positive correlation (r = 0.745, P < 0.0001). Thus, our study shows that curcumin activates autophagy and simultaneously deactivates apoptosis. Previous studies showed that autophagy and apoptosis can happen together,<a class="elsevierStyleCrossRef" href="#bib0020">3</a> independently of each other,<a class="elsevierStyleCrossRef" href="#bib0125">24</a> or activating one can actually lead to inhibiting the other.<a class="elsevierStyleCrossRef" href="#bib0015">2</a> Studies have also suggested that curcumin may lead to cell death through apoptosis,<a class="elsevierStyleCrossRef" href="#bib0130">25</a>,<a class="elsevierStyleCrossRef" href="#bib0135">26</a> or through autophagy without affecting apoptosis at all.<a class="elsevierStyleCrossRef" href="#bib0125">24</a> Other studies also showed that apoptosis can be activated to treat different types of cancer,<a class="elsevierStyleCrossRef" href="#bib0065">12</a> but in some cases cells are resistant to apoptosis,<a class="elsevierStyleCrossRef" href="#bib0125">24</a> which makes an option like autophagic cell death much more valuable in treating of or protecting against cancer.Results of this study showed that curcumin in both doses significantly blocked the elevation of AFP concentration found in TAA group. Curcumin groups also significantly blocked the elevation in ALT and AST activities in TAA group. Cur high-dose group significantly blocked serum albumin concentration reduction found in TAA group. Histopathological examination of liver sections showed marked improvement in both curcumin groups than TAA group, with more improvement in Cur highdose group. These results show that curcumin in both doses help in protection against HCC induced by TAA in rats. Correlation studies also showed significant correlations between LC3-II gene expression levels as a marker of autophagy and each of AFP concentration (r = - 0.445, P < 0.05), ALT activity (r = - 0.571, P <0.05), and AST activity (r = - 0.579, P < 0.05).The induction or inhibition of autophagy to treat and protect against different types of cancer, including HCC, has been thoroughly studied recently. Recent studies found that activating autophagic cell death can lead to a better cancer prognosis in many cancer types including cervical cancer, nasopharyngeal carcinoma, pancreas adenocarcinoma, and HCC as it leads to cancer cell death.<a class="elsevierStyleCrossRefs" href="#bib0140">27</a>-<a class="elsevierStyleCrossRef" href="#bib0150">29</a> Other recent studies found that inhibition of autophagy may enhance the effect of some drugs like bevacizumab in treatment of HCC because autophagy in this case is used as a survival mechanism by cancer cells.<a class="elsevierStyleCrossRef" href="#bib0130">25</a>,<a class="elsevierStyleCrossRef" href="#bib0155">30</a> A recent study suggested an explanation of this paradoxical role of autophagy in HCC by clarifying that the induction of autophagy treats cancer in the first dysplastic stage of HCC, while in the later tumor-forming stages, induction of autophagy leads to worse cancer prognosis.<a class="elsevierStyleCrossRef" href="#bib0015">2</a>This study also aimed to understand the relationship between activating autophagy and increasing ROS levels. ROS play a vital role in the proliferation and survival of cancer cells. However, excessive ROS generation has been reported to cause cancer cell death through autophagic or apoptic pathways.<a class="elsevierStyleCrossRef" href="#bib0050">9</a>,<a class="elsevierStyleCrossRef" href="#bib0160">31</a> TAA is known as a hepatocarcinogen that increases the hepatic concentration of ROS that leads to liver fibrosis, cirrhosis, and finally HCC.<a class="elsevierStyleCrossRef" href="#bib0165">32</a>,<a class="elsevierStyleCrossRef" href="#bib0170">33</a> It also affects liver functions significantly, and interferes with the liver's ability to synthesize proteins like albumin.<a class="elsevierStyleCrossRef" href="#bib0175">34</a> In this study, we measured SOD activity and found increased activity in curcumin groups compared with TAA group, while MDA concentration showed significant decrease only in Cur low-dose group compared with TAA group. This comes in agreement with other studies that state that curcumin has an antioxidant activity.<a class="elsevierStyleCrossRef" href="#bib0180">35</a> Correlation studies showed significant negative correlation between MDA concentration as a marker of ROS level and each of LC3-II gene expression levels (r = - 0.662, P < 0.05), Bcl-2 gene expression levels (r = - 0.862, P < 0.0001).In both SOD and MDA, Cur low-dose group showed significantly better antioxidant activity when compared with Cur high-dose group. It was observed that Cur highdose had less distinct effect on decreasing oxidative stress that Cur low-dose. Also, in the in vitro experiment, treating HepG2 cells with curcumin alone (50 μM), and in combinations with NAC, or with hydrogen peroxide, showed that NAC decreased the effect of curcumin on HepG2 cells viability, while hydrogen peroxide increased that effect (<a class="elsevierStyleCrossRef" href="#f0065">Figure 12</a>). The applied method of adding NAC and hydrogen peroxide separately to a certain drug to study and prove the involvement of ROS in its mechanism has been used to confirm that ROS can either increase or inhibit a certain effect of the drug.<a class="elsevierStyleCrossRefs" href="#bib0185">36</a>-<a class="elsevierStyleCrossRef" href="#bib0195">38</a> Results from our in vitro experiment come in agreement with a recent research article that demonstrated the involvement of ROS in the activation of autophagy using the same technique of adding a ROS initiator like hydrogen peroxide, and a ROS scavenger like NAC but in a different model.<a class="elsevierStyleCrossRef" href="#bib0200">39</a> These two results suggest that curcumin may initially lead to increasing ROS as a part of its mechanism to induce autophagy, and activation of autophagy may then lead to decreasing ROS.<elsevierMultimedia ident="f0065"></elsevierMultimedia>This comes in agreement with recent studies which showed that in order for curcumin to induce autophagy, it leads first to increasing ROS which in turn activates autophagy.<a class="elsevierStyleCrossRef" href="#bib0115">22</a>,<a class="elsevierStyleCrossRef" href="#bib0205">40</a>,<a class="elsevierStyleCrossRef" href="#bib0210">41</a> Recent studies have further explained the relationship between ROS and autophagy, showing that ROS could initiate autophagosome formation, and autophagic degradation acting as cellular signaling molecules.<a class="elsevierStyleCrossRef" href="#bib0215">42</a> Autophagy, in contrast, leads to reducing oxidative damage and ROS levels by removing protein aggregates and damaged cellular organelles such as mitochondria.<a class="elsevierStyleCrossRef" href="#bib0220">43</a><a class="elsevierStyleCrossRef" href="#f0070">Figure 13</a> shows the suggested mechanism for curcumin's effect in protection and treatment of HCC. The figure shows that TAA inhibits autophagy, and that for curcumin to induce autophagy again it needs to increase the concentration of ROS first. Once ROS concentration is increased and the process of autophagy is induced, the concentration of SQSTM-1 decreases, and the gene expression of LC3-II increases as shown in the results. According to our findings, when autophagy is induced in our model, it also leads to inhibition of apoptosis which was evident by the gene expression levels of Bcl-2. Finally, when autophagy is activated, it leads to decreasing the levels of ROS which is responsible for the hepatoprotective effect of curcumin in this early stage of HCC.<elsevierMultimedia ident="f0070"></elsevierMultimedia>Another interesting finding was that changing between different concentrations of curcumin can change the extent to which it inhibits apoptosis and activates autophagy. Curcumin is even reported to induce apoptosis in some cases as discussed before. In this study, Cur high-dose showed a slightly better liver protection than Cur low-dose despite activating autophagy to a lesser extent. This could be due to the fact that Cur high-dose group inhibited apoptosis less than Cur low-dose. This suggests that a complete inhibition of apoptosis might not be beneficial, and striking a certain balance between the two mechanisms of cell death can lead to achieving better results in HCC prevention and treatment.ConclusionFinally, curcumin protects against fibrosis and subsequent HCCup to the first dysplastic stage of HCC by up-regulating autophagy (increasing LC3-II gene expression, and decreasing SQSTM1 concentration) and inhibiting apoptosis (increasing Bcl-2 gene expression). Cur highdose protected more against liver fibrosis by significantly blocking the increase in ALT, AST, and AFP concentrations, and significantly blocking the reduction in albumin concentration caused by TAA. Cur low-dose showed better antioxidant activities by blocking the increase in MDA concentration, and decreasing the activity of SOD. In vitro, Curcumin50 μM showed a significant decrease in HepG2 viability and in SQSTM1 concentration. These findings suggest that curcumin and other autophagy activators can be used in protection against the early stages of HCC. Studying how to manipulate autophagy levels in both early and late stages of HCC, and a better understanding of the complicated relationship between autophagy and apoptosis can lead to better cancer treatment options.Abbreviations<ul class="elsevierStyleList" id="l0015"><li class="elsevierStyleListItem" id="u0025">•AFP: α-fetoprotein.</li><li class="elsevierStyleListItem" id="u0030">•ALT: alanine aminotransferase.</li><li class="elsevierStyleListItem" id="u0035">•AST: aspartate aminotransferase.</li><li class="elsevierStyleListItem" id="u0040">•Cur High-dose: curcumin high-dose.</li><li class="elsevierStyleListItem" id="u0045">•Cur low-dose: curcumin low-dose.</li><li class="elsevierStyleListItem" id="u0050">•GAPDH: glyceraldehyde 3-phosphate dehydrogenase.</li><li class="elsevierStyleListItem" id="u0055">•H&E: hematoxylin and eosin.</li><li class="elsevierStyleListItem" id="u0060">•HCC: hepatocellular carcinoma.</li><li class="elsevierStyleListItem" id="u0065">•LC3-II: microtubule-associated protein light chain 3-II.</li><li class="elsevierStyleListItem" id="u0070">•MDA: malondialdhyde.</li><li class="elsevierStyleListItem" id="u0075">•NAC: N-Acetyl Cysteine.</li><li class="elsevierStyleListItem" id="u0080">•PCR: real-time polymerase chain reaction.</li><li class="elsevierStyleListItem" id="u0085">•SOD: superoxide dismutase.</li><li class="elsevierStyleListItem" id="u0090">•SQSTM1: sequestosome-1.</li><li class="elsevierStyleListItem" id="u0095">•TAA: thioacetamide.</li></ul>" "textoCompletoSecciones" => array:1 [ "secciones" => array:9 [ 0 => array:3 [ "identificador" => "xres1207270" "titulo" => "Abstract" "secciones" => array:3 [ 0 => array:2 [ "identificador" => "abs0010" "titulo" => "Background and rationale" ] 1 => array:2 [ "identificador" => "abs0015" "titulo" => "Results" ] 2 => array:2 [ "identificador" => "abs0020" "titulo" => "Conclusions" ] ] ] 1 => array:2 [ "identificador" => "xpalclavsec1124316" "titulo" => "Keywords" ] 2 => array:2 [ "identificador" => "s0010" "titulo" => "Introduction" ] 3 => array:3 [ "identificador" => "s0015" "titulo" => "Material and Methods" "secciones" => array:2 [ 0 => array:3 [ "identificador" => "s0020" "titulo" => "A in vitro Study" "secciones" => array:2 [ 0 => array:2 [ "identificador" => "s0025" "titulo" => "Cell Line" ] 1 => array:2 [ "identificador" => "s0030" "titulo" => "MTT Assay" ] ] ] 1 => array:3 [ "identificador" => "s0035" "titulo" => "In vivo Study" "secciones" => array:8 [ 0 => array:2 [ "identificador" => "s0040" "titulo" => "Animals and their treatment outlines" ] 1 => array:2 [ "identificador" => "s0045" "titulo" => "Collection of samples" ] 2 => array:2 [ "identificador" => "s0050" "titulo" => "Histopathological analysis of hepatic tissue" ] 3 => array:2 [ "identificador" => "s0055" "titulo" => "Liver function tests" ] 4 => array:2 [ "identificador" => "s0060" "titulo" => "Assessment of oxidative stress" ] 5 => array:2 [ "identificador" => "s0065" "titulo" => "Determination of SQSTM1 concentration" ] 6 => array:2 [ "identificador" => "s0070" "titulo" => "Gene expression of LC3-II, and Bcl-2 by quantitative real-time polymerase chain reaction (RT-PCR)" ] 7 => array:2 [ "identificador" => "s0075" "titulo" => "Statistical analysis" ] ] ] ] ] 4 => array:3 [ "identificador" => "s0080" "titulo" => "RESULTS" "secciones" => array:5 [ 0 => array:2 [ "identificador" => "s0085" "titulo" => "Effect of Curcumin low-dose and Curcumin high-dose on survival percent" ] 1 => array:2 [ "identificador" => "s0090" "titulo" => "Hepatoprotective effect of Curcumin low-dose and Curcumin high-dose in HCC induced by TAA in rats" ] 2 => array:2 [ "identificador" => "s0095" "titulo" => "Oxidative stress markers" ] 3 => array:2 [ "identificador" => "s0100" "titulo" => "Effect of Curcumin low-dose and Curcumin high-dose on autophagic and apoptic pathway" ] 4 => array:2 [ "identificador" => "s0105" "titulo" => "The correlation analysis of studied parameters" ] ] ] 5 => array:2 [ "identificador" => "s0110" "titulo" => "Discussion" ] 6 => array:2 [ "identificador" => "s0115" "titulo" => "Conclusion" ] 7 => array:2 [ "identificador" => "s0120" "titulo" => "Abbreviations" ] 8 => array:1 [ "titulo" => "References" ] ] ] "pdfFichero" => "main.pdf" "tienePdf" => true "fechaRecibido" => "2016-09-14" "fechaAceptado" => "2016-12-14" "PalabrasClave" => array:1 [ "en" => array:1 [ 0 => array:4 [ "clase" => "keyword" "titulo" => "Keywords" "identificador" => "xpalclavsec1124316" "palabras" => array:5 [ 0 => "Liver fibrosis" 1 => "LC3-II" 2 => "SQSTM1" 3 => "Bcl-2" 4 => "ROS" ] ] ] ] "tieneResumen" => true "resumen" => array:1 [ "en" => array:3 [ "titulo" => "Abstract" "resumen" => "Background and rationaleMicrotubule-associated protein light chain 3-II (LC3-II), and Sequestosome-1 (SQSTM1) are proteins that can be used as markers for autophagic pathway. Bcl-2 protein is reported to be inversely correlated with apoptosis. We aimed to investigate the effects of curcumin on liver inflammation and fibrosis up to the first dysplastic stage of Hepatocellular carcinoma (HCC) induced by Thioacetamide (TAA) in rats and to clarify the effects of curcumin on LC3-II, SQSTM1, and Bcl-2. Male Sprague-Dawley rats were randomized into four groups: Control group, TAA group, Curcumin low-dose group, and Curcumin highdose group. The last three groups received TAA 200 mg/kg i.p. twice weekly for 18 weeks. Oxidative stress markers as hepatic malondialdehyde (MDA) concentration and superoxide dismutase (SOD) activity were measured by colorimetric methods. Hepatic SQSTM1 concentration was measured by ELISA, and gene expression levels of Bcl-2, and LC3-II were measured by RT-PCR.We also investigated the in vitro effect of curcumin on HepG2 cells viability through MTT assay, and the involvement of autophagy in this effect. ResultsCurcumin increased the survival percent in rats, decreased -fetoprotein (AFP) concentration, and serum aspartate aminotransferase (AST) activity, and increased serum albumin concentration. Curcumin also significantly reduced oxidative stress in liver, inhibited apoptosis, and induced autophagy. In vitro, curcumin (50 μM) decreased HepG2 cells viabilityand the concentration of SQSTM1. ConclusionsCurcumin leads to protection against TAA induced HCC up to the first dysplastic stage through activating autophagic pathway and inhibiting apoptosis. Also, the antioxidant activity of curcumin almost prevents liver fibrosis." "secciones" => array:3 [ 0 => array:2 [ "identificador" => "abs0010" "titulo" => "Background and rationale" ] 1 => array:2 [ "identificador" => "abs0015" "titulo" => "Results" ] 2 => array:2 [ "identificador" => "abs0020" "titulo" => "Conclusions" ] ] ] ] "multimedia" => array:16 [ 0 => array:7 [ "identificador" => "f0010" "etiqueta" => "Figure 1" "tipo" => "MULTIMEDIAFIGURA" "mostrarFloat" => true "mostrarDisplay" => false "figura" => array:1 [ 0 => array:4 [ "imagen" => "gr1.jpeg" "Alto" => 614 "Ancho" => 933 "Tamanyo" => 46388 ] ] "descripcion" => array:1 [ "en" => "Kaplan-Meier survival percent curve of rats in Thioacetamide (TAA), Cur low-dose (100 mg/kg), and Cur high-dose (200 mg/kg) groups." ] ] 1 => array:7 [ "identificador" => "f0015" "etiqueta" => "Figure 2" "tipo" => "MULTIMEDIAFIGURA" "mostrarFloat" => true "mostrarDisplay" => false "figura" => array:1 [ 0 => array:4 [ "imagen" => "gr2.jpeg" "Alto" => 643 "Ancho" => 929 "Tamanyo" => 52312 ] ] "descripcion" => array:1 [ "en" => "Cell viability level (mean ± SE) in HepG2 cell line of (50, 40, 20, 10, 5 μM of curcumin) relative to the control group. * Significant against control group at P < 0.05." ] ] 2 => array:7 [ "identificador" => "f0020" "etiqueta" => "Figure 3" "tipo" => "MULTIMEDIAFIGURA" "mostrarFloat" => true "mostrarDisplay" => false "figura" => array:1 [ 0 => array:4 [ "imagen" => "gr3.jpeg" "Alto" => 717 "Ancho" => 899 "Tamanyo" => 60653 ] ] "descripcion" => array:1 [ "en" => "Effect of Cur low-dose (100 mg/kg) and Cur high-dose (200 mg/ kg) on serum -fetoprotein (AFP) concentration (mean ± SE) in Thioacetamide (200 mg/kg) induced HCC. * Significant against control group at P < 0.05. # Significant against TAA group at P < 0.05." ] ] 3 => array:7 [ "identificador" => "f0025" "etiqueta" => "Figure 4" "tipo" => "MULTIMEDIAFIGURA" "mostrarFloat" => true "mostrarDisplay" => false "figura" => array:1 [ 0 => array:4 [ "imagen" => "gr4.jpeg" "Alto" => 814 "Ancho" => 2049 "Tamanyo" => 395996 ] ] "descripcion" => array:1 [ "en" => "Liver sections stained with H/E, and Masson Trichrome of Control, TAA (thioacetamide 200 mg/kg twice weekly), Cur low-dose (100 mg/kg daily), and Cur high-dose (200 mg/kg daily) groups. Upper panel shows more improvement in Cur high-dose group than Cur low-dose group compared to marked necroinflammatory changes with dysplastic nodules in the TAA group. Lower panel showed marked collagen deposition with complete cirrhosis in TAA group with reduction of collagen deposition in Cur high-dose group than Cur low-dose group." ] ] 4 => array:7 [ "identificador" => "f0030" "etiqueta" => "Figure 5" "tipo" => "MULTIMEDIAFIGURA" "mostrarFloat" => true "mostrarDisplay" => false "figura" => array:1 [ 0 => array:4 [ "imagen" => "gr5.jpeg" "Alto" => 714 "Ancho" => 918 "Tamanyo" => 56726 ] ] "descripcion" => array:1 [ "en" => "Effect of Cur low-dose (100 mg/kg) and Cur high-dose (200 mg/ kg) on hepatic superoxide dismutase activity (SOD) (mean ± SE) in Thioacetamide (200 mg/kg) induced HCC. * Significant against control group at P < 0.05. # Significant against TAA group at P < 0.05. † Significant against Cur low-dose group at P < 0.05." ] ] 5 => array:7 [ "identificador" => "f0035" "etiqueta" => "Figure 6" "tipo" => "MULTIMEDIAFIGURA" "mostrarFloat" => true "mostrarDisplay" => false "figura" => array:1 [ 0 => array:4 [ "imagen" => "gr6.jpeg" "Alto" => 715 "Ancho" => 932 "Tamanyo" => 60962 ] ] "descripcion" => array:1 [ "en" => "Effect of Cur low-dose (100 mg/kg) and Cur high-dose (200 mg/ kg) on hepatic malondialdehyde (MDA) concetration (mean ± SE) in Thioacetamide (200 mg/kg) induced HCC. * Significant against control group at P < 0.05. # Significant against TAA group at P < 0.05. † Significant against Cur low-dose group at P < 0.05." ] ] 6 => array:7 [ "identificador" => "f0040" "etiqueta" => "Figure 7" "tipo" => "MULTIMEDIAFIGURA" "mostrarFloat" => true "mostrarDisplay" => false "figura" => array:1 [ 0 => array:4 [ "imagen" => "gr7.jpeg" "Alto" => 714 "Ancho" => 927 "Tamanyo" => 60979 ] ] "descripcion" => array:1 [ "en" => "Effect of Cur low-dose (100 mg/kg) and Cur high-dose (200 mg/kg) on liver sequestosome-1 (SQSTM1) concetration (mean ± SE) in Thioacetamide (200 mg/kg) induced HCC. # Significant against TAA group at P < 0.05." ] ] 7 => array:7 [ "identificador" => "f0045" "etiqueta" => "Figure 8" "tipo" => "MULTIMEDIAFIGURA" "mostrarFloat" => true "mostrarDisplay" => false "figura" => array:1 [ 0 => array:4 [ "imagen" => "gr8.jpeg" "Alto" => 712 "Ancho" => 942 "Tamanyo" => 48328 ] ] "descripcion" => array:1 [ "en" => "Effect of Cur low-dose (100 mg/kg) and Cur high-dose (200 mg/ kg) on microtubule-associated protein light chain 3 II (LC3-II) gene expression levels (mean ± SE) in Thioacetamide (200 mg/kg) induced HCC. * Significant against control group at P < 0.05. #Significant against TAA group at P < 0.05. † Significant against Cur low-dose group at P < 0.05." ] ] 8 => array:7 [ "identificador" => "f0050" "etiqueta" => "Figure 9" "tipo" => "MULTIMEDIAFIGURA" "mostrarFloat" => true "mostrarDisplay" => false "figura" => array:1 [ 0 => array:4 [ "imagen" => "gr9.jpeg" "Alto" => 663 "Ancho" => 940 "Tamanyo" => 50226 ] ] "descripcion" => array:1 [ "en" => "Sequestosome-1 (SQSTM1) concentration (mean ± SE) in HepG2 cell line in control and with 50 μM of curcumin. * Significant against control group at P < 0.05." ] ] 9 => array:7 [ "identificador" => "f0055" "etiqueta" => "Figure 10" "tipo" => "MULTIMEDIAFIGURA" "mostrarFloat" => true "mostrarDisplay" => false "figura" => array:1 [ 0 => array:4 [ "imagen" => "gr10.jpeg" "Alto" => 709 "Ancho" => 942 "Tamanyo" => 49459 ] ] "descripcion" => array:1 [ "en" => "Effect of Cur low-dose (100 mg/kg) and Cur high-dose (200 mg/kg) on Bcl-2 gene expression levels (mean ± SE) in Thioacetamide (200 mg/kg) induced HCC. * Significant against control group at P < 0.05. # Significant against TAA group at P < 0.05. † Significant against Cur low-dose group at P < 0.05." ] ] 10 => array:7 [ "identificador" => "f0060" "etiqueta" => "Figure 11" "tipo" => "MULTIMEDIAFIGURA" "mostrarFloat" => true "mostrarDisplay" => false "figura" => array:1 [ 0 => array:4 [ "imagen" => "gr11.jpeg" "Alto" => 2449 "Ancho" => 2080 "Tamanyo" => 281392 ] ] "descripcion" => array:1 [ "en" => "Significant correlation between hepatic gene expression levels of LC3-II with (A) hepatic gene expression levels of Bcl-2 (r = 0.745, P < 0.0001), (B) SQSTM1 concentration (r = -0.451, P < 0.05), (C) MDA concentration (r = -0.662, P < 0.05), (D) Serum AST activity (r = -0.579, P < 0.05), (E) Serum ALT activity (r = -0.571, P < 0.05), and (F) AFP concentration (r = -0.445, P < 0.05), and between hepatic gene expression levels of Bcl-2 with (G) SQSTM1 concentration (r = -0.521, P < 0.05), and (H) MDA concentration (r = -0.862, P < 0.0001)." ] ] 11 => array:7 [ "identificador" => "f0065" "etiqueta" => "Figure 12" "tipo" => "MULTIMEDIAFIGURA" "mostrarFloat" => true "mostrarDisplay" => false "figura" => array:1 [ 0 => array:4 [ "imagen" => "gr12.jpeg" "Alto" => 668 "Ancho" => 912 "Tamanyo" => 52212 ] ] "descripcion" => array:1 [ "en" => "MTT assay of viability of HepG2 cells with control, curcumin 50 μM alone, curcumin 50 μM with N-Acetyl Cysteine (NAC), and curcumin 50 μM with hydrogen peroxide. * Significant against control group at P < 0.05. # Significant against curcumin 50 μM group at P < 0.05." ] ] 12 => array:7 [ "identificador" => "f0070" "etiqueta" => "Figure 13" "tipo" => "MULTIMEDIAFIGURA" "mostrarFloat" => true "mostrarDisplay" => false "figura" => array:1 [ 0 => array:4 [ "imagen" => "gr13.jpeg" "Alto" => 1039 "Ancho" => 1380 "Tamanyo" => 112807 ] ] "descripcion" => array:1 [ "en" => "Postulated mechanism for the effect of curcumin on autophagic and apoptic pathways, and ROS in Thioacetamide induced HCC." ] ] 13 => array:7 [ "identificador" => "t0010" "etiqueta" => "Table 1" "tipo" => "MULTIMEDIATABLA" "mostrarFloat" => true "mostrarDisplay" => false "tabla" => array:1 [ "tablatextoimagen" => array:1 [ 0 => array:2 [ "tabla" => array:1 [ 0 => """ <table border="0" frame="\n \t\t\t\t\tvoid\n \t\t\t\t" class=""><thead title="thead"><tr title="table-row"><th class="td" title="\n \t\t\t\t\ttable-head\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t" scope="col" style="border-bottom: 2px solid black">Gene \t\t\t\t\t\t\n \t\t\t\t\t\t</th><th class="td" title="\n \t\t\t\t\ttable-head\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t" scope="col" style="border-bottom: 2px solid black">Sequence \t\t\t\t\t\t\n \t\t\t\t\t\t</th></tr></thead><tbody title="tbody"><tr title="table-row"><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">Rat LC3-II forward \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">CTCATCCGGGAGCAGCAT \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">Rat LC3-II reverse \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">CTCACCCTTGTATCGCTCTATAATCA \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">Rat Bcl-2 forward \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">ATCGCTCTGTGGATGACTGAGTAC \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">Rat Bcl-2 reverse \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">AGAGACAGCCAGGAGAAATCAAAC \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">Rat GAPDH forward \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">AAGTTCAACGGCACAGTCAAGG \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">Rat GAPDH reverse \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">CATACTCAGCACCAGCATCACC \t\t\t\t\t\t\n \t\t\t\t</td></tr></tbody></table> """ ] "imagenFichero" => array:1 [ 0 => "xTab2060683.png" ] ] ] ] "descripcion" => array:1 [ "en" => "Primer sequences used for the RT-PCR step." ] ] 14 => array:8 [ "identificador" => "t0015" "etiqueta" => "Table 2" "tipo" => "MULTIMEDIATABLA" "mostrarFloat" => true "mostrarDisplay" => false "fuente" => "Values: (mean ± SE). * Significant against control group at P < 0.05. # Significant against TAA group at P < 0.05. † Significant against Cur low-dose group at P < 0.05." "tabla" => array:1 [ "tablatextoimagen" => array:1 [ 0 => array:2 [ "tabla" => array:1 [ 0 => """ <table border="0" frame="\n \t\t\t\t\tvoid\n \t\t\t\t" class=""><thead title="thead"><tr title="table-row"><th class="td" title="\n \t\t\t\t\ttable-head\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t" scope="col" style="border-bottom: 2px solid black">Group \t\t\t\t\t\t\n \t\t\t\t\t\t</th><th class="td" title="\n \t\t\t\t\ttable-head\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t" scope="col" style="border-bottom: 2px solid black">Rats (n) \t\t\t\t\t\t\n \t\t\t\t\t\t</th><th class="td" title="\n \t\t\t\t\ttable-head\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t" scope="col" style="border-bottom: 2px solid black">ALT activity (U/L) \t\t\t\t\t\t\n \t\t\t\t\t\t</th><th class="td" title="\n \t\t\t\t\ttable-head\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t" scope="col" style="border-bottom: 2px solid black">AST activity (U/L) \t\t\t\t\t\t\n \t\t\t\t\t\t</th><th class="td" title="\n \t\t\t\t\ttable-head\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t" scope="col" style="border-bottom: 2px solid black">Albumin concentration (g/dL) \t\t\t\t\t\t\n \t\t\t\t\t\t</th></tr></thead><tbody title="tbody"><tr title="table-row"><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">Control \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">10 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">61.01 ± 3.97 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">45.46 ± 1.46 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">5.57 ± 0.09 \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">TAA \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">8 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">167.60 ± 2.60 * \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">97.46 ± 1.21 * \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">4.67 ± 0.15 * \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">Cur low-dose \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">10 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">96.08 ± 2.93 *# \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">61.36 ± 2.39 *,# \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">4.71 ± 0.12 * \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">Cur high-dose \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">8 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">86.52 ± 2.41 *# \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">67.48 ± 1.36 *,# \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">5.61 ± 0.17 #,† \t\t\t\t\t\t\n \t\t\t\t</td></tr></tbody></table> """ ] "imagenFichero" => array:1 [ 0 => "xTab2060682.png" ] ] ] ] "descripcion" => array:1 [ "en" => "Effect of Cur low-dose (100 mg/kg) and Cur high-dose (200 mg/kg) on serum Alanine aminotransferase activity (ALT), Aspartate aminotransferase activity (AST), and albumin concentration in Thioacetamide (200 mg/kg) induced HCC." ] ] 15 => array:8 [ "identificador" => "t0020" "etiqueta" => "Table 3" "tipo" => "MULTIMEDIATABLA" "mostrarFloat" => true "mostrarDisplay" => false "fuente" => "* Correlation is significant at P < 0.05 level." "tabla" => array:1 [ "tablatextoimagen" => array:1 [ 0 => array:2 [ "tabla" => array:1 [ 0 => """ <table border="0" frame="\n \t\t\t\t\tvoid\n \t\t\t\t" class=""><thead title="thead"><tr title="table-row"><th class="td" title="\n \t\t\t\t\ttable-head\n \t\t\t\t " align="" valign="\n \t\t\t\t\ttop\n \t\t\t\t" scope="col" style="border-bottom: 2px solid black"> \t\t\t\t\t\t\n \t\t\t\t\t\t</th><th class="td" title="\n \t\t\t\t\ttable-head\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t" scope="col" style="border-bottom: 2px solid black">MDA \t\t\t\t\t\t\n \t\t\t\t\t\t</th><th class="td" title="\n \t\t\t\t\ttable-head\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t" scope="col" style="border-bottom: 2px solid black">AFP \t\t\t\t\t\t\n \t\t\t\t\t\t</th><th class="td" title="\n \t\t\t\t\ttable-head\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t" scope="col" style="border-bottom: 2px solid black">LC3-II \t\t\t\t\t\t\n \t\t\t\t\t\t</th><th class="td" title="\n \t\t\t\t\ttable-head\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t" scope="col" style="border-bottom: 2px solid black">Bcl-2 \t\t\t\t\t\t\n \t\t\t\t\t\t</th><th class="td" title="\n \t\t\t\t\ttable-head\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t" scope="col" style="border-bottom: 2px solid black">Albumin \t\t\t\t\t\t\n \t\t\t\t\t\t</th><th class="td" title="\n \t\t\t\t\ttable-head\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t" scope="col" style="border-bottom: 2px solid black">SQSTM1 \t\t\t\t\t\t\n \t\t\t\t\t\t</th></tr></thead><tbody title="tbody"><tr title="table-row"><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">MDA \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">1 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">0.361* \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">-0.662* \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">-0.862* \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">0.327 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">0.435* \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">AFP \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">0.361* \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">1 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">-0.445* \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">-0.215* \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">-0.339 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">0.397* \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">LC3-II \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">-0.662* \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">-0.445* \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">1 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">0.745* \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">0.112 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">-0.451* \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">Bcl-2 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">-0.862* \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">-0.215* \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">0.745* \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">1 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">-0.286 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">-0.521* \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">Albumin \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">0.327 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">-0.339 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">0.112 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">-0.286 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">1 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">-0.029 \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">SQSTM1 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">0.435* \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">0.397* \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">-0.451* \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">-0.521* \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">-0.029 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">1 \t\t\t\t\t\t\n \t\t\t\t</td></tr></tbody></table> """ ] "imagenFichero" => array:1 [ 0 => "xTab2060684.png" ] ] ] ] 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Ahmed M. Elmansi*, Amro A. El-Karef**, Mamdouh M. El-Shishtawy

Corresponding author

mshisht@mans.edu.eg

Correspondence and reprint request:

, Laila A. Eissa*

* Department of Biochemistry, Faculty of Pharmacy, Mansoura University, Mansoura, Egypt

** Department of Pathology, Faculty of Medicine, Mansoura University, Mansoura, Egypt

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Curcumin has been shown to exhibit antioxidant&#44; anti-inflammatory&#44; antiviral&#44; antibacterial&#44; antifungal&#44; and anticancer activities and thus has a potential protective role against various malignant diseases&#44; diabetes&#44; allergies&#44; arthritis&#44; Alzheimer&#39;s disease&#44; and other chronic illnesses&#46;</p><p id="p0020" class="elsevierStylePara elsevierViewall">It has also been shown to induce cell death in apoptosis resistant cancer cells&#46;<a class="elsevierStyleCrossRef" href="#bib0020"><span class="elsevierStyleSup">3</span></a><span class="elsevierStyleSup">&#44;</span><a class="elsevierStyleCrossRef" href="#bib0025"><span class="elsevierStyleSup">4</span></a></p><p id="p0025" class="elsevierStylePara elsevierViewall">Autophagy is an evolutionarily conserved self-digestive mechanism&#44; which involves many steps&#46;<a class="elsevierStyleCrossRef" href="#bib0030"><span class="elsevierStyleSup">5</span></a> These steps include&#58; aggregation of double-membrane&#44; formation of autophagosome that engulfs the targeted region&#44; its fusion with lysosomes and digestion in autolysosomes&#46; Under starvation or other stresses&#44; autophagy is required for cell survival to eliminate the damaged cellular components and to maintain nutrition and energy homeostasis&#46; Therefore&#44; autophagy has a close relationship with many biological or pathological phenomena including carcinogenesis&#46; Many recent studies have indicated that autophagy has a tumor-suppressive function&#46;<a class="elsevierStyleCrossRef" href="#bib0015"><span class="elsevierStyleSup">2</span></a><span class="elsevierStyleSup">&#44;</span><a class="elsevierStyleCrossRef" href="#bib0035"><span class="elsevierStyleSup">6</span></a> Besides tumor-suppressive function&#59; autophagy has been reported to promote tumor development&#46; Many recent studies have revealed that autophagy was essential for oncogene-mediated tumorigenesis&#44;<a class="elsevierStyleCrossRef" href="#bib0040"><span class="elsevierStyleSup">7</span></a> which seemingly raises a paradox&#46; However&#44; autophagy probably has different roles in different stages of tumor development&#44; which is a multistep and complicated process&#46;<a class="elsevierStyleCrossRef" href="#bib0015"><span class="elsevierStyleSup">2</span></a><span class="elsevierStyleSup">&#44;</span><a class="elsevierStyleCrossRef" href="#bib0045"><span class="elsevierStyleSup">8</span></a><span class="elsevierStyleSup">&#44;</span><a class="elsevierStyleCrossRef" href="#bib0050"><span class="elsevierStyleSup">9</span></a></p><p id="p0030" class="elsevierStylePara elsevierViewall">Microtubule-associated protein light chain 3 is a protein involved in the autophagy process&#44; and exists in either of two forms&#44; a cytosolic form &#40;18 kDa&#44; LC3-I&#41; and membrane-bound form &#40;16 kDa&#44; LC3-II&#41; which results from proteolysis and lipid modification of LC3-I&#46; Since LC3-I is processed into LC3-II which in turn is incorporated into autophagosomal membranes during autophagy&#44; the accumulation of LC3-II is considered as one of the markers of autophagy induction&#46;<a class="elsevierStyleCrossRef" href="#bib0055"><span class="elsevierStyleSup">10</span></a></p><p id="p0035" class="elsevierStylePara elsevierViewall">In addition to LC3&#44; SQSTM1 is another autophagy specific substrate&#44; since it has been reported to directly bind to LC3&#44; incorporate into autophagosome&#44; and finally degrade by autophagy&#46; For example&#44; in autophagy-deficient cells&#44; autophagy-inducing stimulus such as starvation failed to reduce SQSTM1 expression&#46; Therefore&#44; SQSTM1 expression level is inversely correlated with autophagic activity&#46;<a class="elsevierStyleCrossRef" href="#bib0060"><span class="elsevierStyleSup">11</span></a></p><p id="p0040" class="elsevierStylePara elsevierViewall">Bcl-2 protein is one of the Bcl-2 proteins family that includes both pro- and anti-apoptic proteins&#46; Bcl-2 belongs to the anti-apoptic group that down regulates autophagy through inhibiting other pro-apoptic members of the same family&#46; Besides inactivation of pro-apoptotic Bcl-2 family proteins&#44; the presence of elevated levels of anti-apoptotic family members is an obvious mechanism of apoptosis dysregulation in cancer&#46;<a class="elsevierStyleCrossRef" href="#bib0065"><span class="elsevierStyleSup">12</span></a><span class="elsevierStyleSup">&#44;</span><a class="elsevierStyleCrossRef" href="#bib0070"><span class="elsevierStyleSup">13</span></a></p></span><span id="s0015" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="st0040">Material and Methods</span><span id="s0020" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="st0045">A in vitro Study</span><span id="s0025" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="st0050">Cell Line</span><p id="p0045" class="elsevierStylePara elsevierViewall">The HepG2 cell line was purchased from The Holding Company for Biological Products &#38; Vaccines &#40;Vacsera&#44; Cairo&#44; Egypt&#41;&#44; where the HepG2 cells were examined for identity and absence of bacteria&#44; mycoplasma and viruses&#46;</p><p id="p0050" class="elsevierStylePara elsevierViewall">HepG2 cells were grown in Dulbecco&#39;s Modified Eagle&#39;s medium supplemented with 10&#37; fetal bovine serum and 1&#37; streptomycin and penicillin&#44; and incubated for 24 h at 37 &#176;C in a 5&#37; CO<span class="elsevierStyleInf">2</span> incubator to allow the cells to grow&#46;</p></span><span id="s0030" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="st0055">MTT Assay</span><p id="p0055" class="elsevierStylePara elsevierViewall">1 x 10<span class="elsevierStyleSup">4</span> cells were plated in each well of 96-well plate&#44; and were placed in the humidified 5&#37; CO<span class="elsevierStyleInf">2</span> incubator at 37 &#176;C to allow them to grow for 24 h period&#46; Cells were transferred to serum-free medium and exposed to different concentrations of curcumin &#40;5&#44; 10&#44; 20&#44; 40&#44; and 50 &#956;M&#41; and another two combinations were made between curcumin 50 &#956;M and N-Acetyl Cysteine &#40;NAC&#41; &#40;Sigma-Aldrich&#44; St&#46; Louis&#44; MO&#44; USA&#41;&#44; and between curcumin 50 &#956;M with hydrogen peroxide &#40;El-Gomhouria Co&#46;&#44; Cairo&#44; Egypt&#41; and placed in the humidified 5&#37; CO<span class="elsevierStyleInf">2</span> incubator for 24 h for evaluation&#46;</p></span></span><span id="s0035" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="st0060">In vivo Study</span><span id="s0040" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="st0065">Animals and their treatment outlines</span><p id="p0060" class="elsevierStylePara elsevierViewall">The animal protocol was approved by ethical committee in Faculty of Pharmacy&#44; Mansoura University &#40;proto-col code No&#46; 2012-32&#41; Mansoura&#44; Egypt&#44; in accordance with &#8220;Principles of Laboratory Animal Care&#8221; &#40;NIH publi-cation No&#46; 85-23&#44; revised 1985&#41;&#46; 66 Male Sprague Dawely rats weighing 180-200 g were used&#46; All animals in the study were maintained under standard conditions of temperature 25 &#177; 2 &#176;C&#44; with regular 12 h light&#47;12 h dark cycle and allowed free access to food and water&#46; Rats were divided into 4 groups&#58;<ul class="elsevierStyleList" id="l0010"><li class="elsevierStyleListItem" id="u0010"><span class="elsevierStyleLabel">&#8226;</span><p id="p0065" class="elsevierStylePara elsevierViewall">Control group &#40;10 rats&#41;&#46; Rats received corn oil through oral gavage and served as a negative control group throughout the study&#46;</p></li><li class="elsevierStyleListItem" id="u0015"><span class="elsevierStyleLabel">&#8226;</span><p id="p0070" class="elsevierStylePara elsevierViewall">TAA group &#40;24 rats&#41;&#46; Rats were injected with thioacetamide &#40;TAA&#41; &#40;Sigma-Aldrich&#44; St&#46; Louis&#44; MO&#44; USA&#41; at a dose of 200 mg&#47;kg&#44; intraperitoneal &#40;i&#46;p&#46;&#41; twice per week for 18 weeks&#46;<a class="elsevierStyleCrossRef" href="#bib0075"><span class="elsevierStyleSup">14</span></a></p></li><li class="elsevierStyleListItem" id="u0020"><span class="elsevierStyleLabel">&#8226;</span><p id="p0075" class="elsevierStylePara elsevierViewall">Curcumin low-dose &#40;Cur low-dose&#41; group and Curcumin high-dose &#40;Cur high-dose&#41; group &#40;16 rats each&#41;&#46;</p></li></ul></p><p id="p0080" class="elsevierStylePara elsevierViewall">The two groups received curcumin 100 mg&#47;kg&#44;<a class="elsevierStyleCrossRef" href="#bib0080"><span class="elsevierStyleSup">15</span></a> and 200 mg&#47;kg<a class="elsevierStyleCrossRef" href="#bib0085"><span class="elsevierStyleSup">16</span></a> daily&#44; respectively&#44; by oral gavage throughout the whole study and were injected with TAA &#40;200 mg&#47;kg&#44; i&#46;p&#46;&#41; twice per week for 18 weeks starting from the second week after administration of curcumin&#46;</p></span><span id="s0045" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="st0070">Collection of samples</span><p id="p0085" class="elsevierStylePara elsevierViewall">After the experimental period&#44; rats were fasted overnight then blood samples were taken from the heart under diethyl ether anesthesia&#46; The clotted blood samples were centrifuged at 5&#44;000 rpm for 5 min for serum separation&#46; Serum was divided into aliquots for biochemical analysis&#46; Rats were sacrificed by decapitation&#59; the whole liver was dissected&#44; and immersed in ice-cold saline&#46; A small part from right lobe of liver was cut and fixed in 10&#37; phosphate-buffered formalin &#40;pH 7&#46;2&#41; for histopathological examination&#46; The remaining liver was kept in liquid nitrogen for subsequent analysis&#46; It was then homogenized in 10-fold volume of ice-cold sodium potassium phosphate buffer &#40;0&#46;01 M&#44; pH 7&#46;4&#41; containing 1&#46;15&#37; KCl&#46; The homogenates were centrifuged at 600 x g for 10 min at 4 &#176;C&#44; and the supernatant was stored at -80 &#176;C&#46;</p></span><span id="s0050" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="st0075">Histopathological analysis of hepatic tissue</span><p id="p0090" class="elsevierStylePara elsevierViewall">Phosphate buffered formalin-fixed liver tissues were embedded in paraffin&#44; cut into 5 &#956;m thick sections and stained with hematoxylin and eosin &#40;H&#38;E&#41; and Masson&#39;s trichrome for histopathological examination&#46;</p><p id="p0095" class="elsevierStylePara elsevierViewall">Hepatic specimens were anonymously coded and examined in a masked manner&#46;</p></span><span id="s0055" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="st0080">Liver function tests</span><p id="p0100" class="elsevierStylePara elsevierViewall">Serum alanine aminotransferase &#40;ALT&#41; and aspartate aminotransferase &#40;AST&#41; activities and albumin and AFP concentrations were measured by the standard methodologies using commercially available kits provided by Bio-diagnostic Company &#40;Dokki&#44; Giza&#44; Egypt&#41;&#46;</p></span><span id="s0060" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="st0085">Assessment of oxidative stress</span><p id="p0105" class="elsevierStylePara elsevierViewall">It was estimated through determination of hepatic malondialdhyde &#40;MDA&#41; concentration&#44; and hepatic superoxide dismutase &#40;SOD&#41; activity using commercially available kits provided by Biodiagnostic Company &#40;Dokki&#44; Giza&#44; Egypt&#41;&#46;</p></span><span id="s0065" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="st0090">Determination of SQSTM1 concentration</span><p id="p0110" class="elsevierStylePara elsevierViewall">The concentration of biochemical parameter SQSTM1 in the liver&#44; and in HepG2 cells were measured by ELISA using a commercially available SQSTM1 &#40;Enzo life sciences&#44; NY&#44; USA&#41; in accordance with the manufacturer&#39;s instructions&#46;</p></span><span id="s0070" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="st0095">Gene expression of LC3-II&#44; and Bcl-2 by quantitative real-time polymerase chain reaction &#40;RT-PCR&#41;</span><p id="p0115" class="elsevierStylePara elsevierViewall">Total RNA for LC3-II&#44; Bcl-2&#44; and Glyceraldehyde 3-phosphate dehydrogenase &#40;GAPDH&#41; was isolated from euthanized rat liver using GF-1 total RNA extraction kit &#40;Vivantis&#44; Malaysia&#41;&#46; One microgram of total RNA was reverse transcribed into single-stranded complementary DNA by using FastQuant RT Kit &#40;with gDNase&#41; &#40;Tain-gen&#44; China&#41;&#46; Bcl-2 and LC3-II mRNA levels in different rat liver tissues were determined using Maxima SYBR Green&#47;Fluorescein qPCR Master Mix by Rotor-Gene Q &#40;Qiagen&#44; USA&#41;&#46; In the meanwhile&#44; rat GAPDH was used as a housekeeping gene and an internal reference control&#46; Gene-specific PCR primers <span class="elsevierStyleItalic">&#40;</span><a class="elsevierStyleCrossRef" href="#t0010"><span class="elsevierStyleItalic">Table 1</span></a><span class="elsevierStyleItalic">&#41;</span> were obtained using Primer Express 3&#46;0 &#40;Applied Biosystems&#44; USA&#41;&#44; and GAP-DH gene sequences were obtained from previous studies&#46;<a class="elsevierStyleCrossRef" href="#bib0090"><span class="elsevierStyleSup">17</span></a></p><elsevierMultimedia ident="t0010"></elsevierMultimedia></span><span id="s0075" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="st0100">Statistical analysis</span><p id="p0120" class="elsevierStylePara elsevierViewall">For descriptive statistics of quantitative variables&#44; the mean &#177; standard error was used&#46; One-way analysis of variance &#40;ANOVA&#41; was used to compare means between groups&#46; Rats&#8217; survival was estimated using the Kaplan-Meier method&#46; Statistical computations were done on a personal computer using the computer software Prism 6&#46; Statistical significance was predefined as P &#60; 0&#46;05&#46;</p></span></span></span><span id="s0080" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="st0105">RESULTS</span><span id="s0085" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="st0110">Effect of Curcumin low-dose and Curcumin high-dose on survival percent</span><p id="p0125" class="elsevierStylePara elsevierViewall">The survival percent of rats was 33&#37; in TAA group &#40;<a class="elsevierStyleCrossRef" href="#f0010">Figure 1</a>&#41;&#46; Cur low-dose showed an increase in animal survival percent to 50&#37;&#44; while Cur high-dose showed an increase in animal survival percent to 62&#46;5&#37;&#46;</p><elsevierMultimedia ident="f0010"></elsevierMultimedia><p id="p0130" class="elsevierStylePara elsevierViewall">Regarding in vitro studies&#44; treatment with Curcumin showed a significant reduction in the viability of HepG2 cells only with 50 &#956;M dose &#40;<a class="elsevierStyleCrossRef" href="#f0015">Figure 2</a>&#41;&#46;</p><elsevierMultimedia ident="f0015"></elsevierMultimedia></span><span id="s0090" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="st0115">Hepatoprotective effect of Curcumin low-dose and Curcumin high-dose in HCC induced by TAA in rats</span><p id="p0135" class="elsevierStylePara elsevierViewall">Next&#44; we examined the hepatoprotective effect of curcumin against HCC induced by TAA <span class="elsevierStyleItalic">in vivo</span>&#46; TAA rats showed 2&#46;7- and 2&#46;1-fold significant increase in serum ALT&#44; and AST activities&#44; respectively&#44; while Cur low-dose and Cur high-dose groups showed a significant decrease in ALT&#44; and AST activities from TAA group &#40;<a class="elsevierStyleCrossRef" href="#t0015">Table 2</a>&#41;&#46; TAA group also showed a 17&#37; significant reduction in serum albumin level in TAA group as compared with the control group&#44; with only Cur high-dose group showing a significant increase in serum albumin level from TAA group &#40;<a class="elsevierStyleCrossRef" href="#t0015">Table 2</a>&#41;&#46;</p><elsevierMultimedia ident="t0015"></elsevierMultimedia><p id="p0140" class="elsevierStylePara elsevierViewall">We also found 1&#46;5-fold increase in serum AFP in TAA group as compared to control group &#40;<a class="elsevierStyleCrossRef" href="#f0020">Figure 3</a>&#41;&#46; Both curcumin groups blocked the increase in serum AFP level in TAA group&#46;</p><elsevierMultimedia ident="f0020"></elsevierMultimedia><p id="p0145" class="elsevierStylePara elsevierViewall">In addition&#44; liver sections stained with H&#47;E showed marked necroinflammatory changes with dysplastic nodules&#46; However&#44; sections from curcumin groups showed nearly normal appearance of hepatic lobule&#44; with liver sections from Cur high-dose group &#40;200 mg&#47;kg daily&#41; showing more improvement than Cur low-dose &#40;100 mg&#47; kg daily&#41;&#44; while liver sections stained with Masson Trichrome showed marked collagen deposition with complete cirrhosis in TAA group with less collagen deposition in Cur high-dose group than Cur low-dose group &#40;<a class="elsevierStyleCrossRef" href="#f0025">Figure 4</a>&#41;&#46;</p><elsevierMultimedia ident="f0025"></elsevierMultimedia></span><span id="s0095" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="st0120">Oxidative stress markers</span><p id="p0150" class="elsevierStylePara elsevierViewall">It is known that the oxidative stress status has a key role in HCC development and progression&#46; We found 0&#46;7-fold significant decrease in hepatic SOD activity &#40;<a class="elsevierStyleCrossRef" href="#f0030">Figure 5</a>&#41;&#44; and 1&#46;3-fold significant increase in hepatic MDA levels &#40;<a class="elsevierStyleCrossRef" href="#f0035">Figure 6</a>&#41; in TAA group as compared with the control group&#46;</p><elsevierMultimedia ident="f0030"></elsevierMultimedia><elsevierMultimedia ident="f0035"></elsevierMultimedia><p id="p0155" class="elsevierStylePara elsevierViewall">Rats in Cur low-dose group showed significant reduction to the elevated MDA levels in TAA group&#44; and significant increase to the reduced SOD activity in TAA group&#46; Rats in Cur high-dose group did not show a significant change from TAA group in both oxidative stress markers&#46;</p></span><span id="s0100" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="st0125">Effect of Curcumin low-dose and Curcumin high-dose on autophagic and apoptic pathway</span><p id="p0160" class="elsevierStylePara elsevierViewall">As shown in <a class="elsevierStyleCrossRef" href="#f0040">figure 7</a>&#44; TAA group showed non-significant increase in SQSTM1 concentration when compared with control group&#46; Cur low-dose group showed significant decrease in SQSTM1 concentration compared with control group&#44; and showed significant increase in LC3-II hepatic gene expression levels compared with control group&#46; Cur high-dose group showed non-significant decrease in SQSTM1 concentration and significant increase in LC3-II gene expression levels from control group as shown in <a class="elsevierStyleCrossRef" href="#f0045">figure 8</a>&#46; In addition&#44; treatment of HepG2 cells with curcumin caused a significant decrease in SQSTM1 &#40;<a class="elsevierStyleCrossRef" href="#f0050">Figure 9</a>&#41;&#46;</p><elsevierMultimedia ident="f0040"></elsevierMultimedia><elsevierMultimedia ident="f0045"></elsevierMultimedia><elsevierMultimedia ident="f0050"></elsevierMultimedia><p id="p0165" class="elsevierStylePara elsevierViewall">Curcumin also showed significant increase in Bcl-2 gene expression levels in both concentrations &#40;<a class="elsevierStyleCrossRef" href="#f0055">Figure 10</a>&#41;&#44; a gene that is known to inhibit apoptosis&#44; which means that curcumin had an inhibitory effect on apoptosis in this study&#46; Moreover the effect of curcumin in induction of autophagy in both doses was highly correlated with the inhibitory effect on apoptosis for each dose&#46;</p><elsevierMultimedia ident="f0055"></elsevierMultimedia></span><span id="s0105" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="st0130">The correlation analysis of studied parameters</span><p id="p0170" class="elsevierStylePara elsevierViewall">The data in <a class="elsevierStyleCrossRef" href="#t0020">table 3</a>&#44; and <a class="elsevierStyleCrossRef" href="#f0060">figure 11</a> show the correlation analysis of the studied parameters&#46; LC3-II gene expression level is positively correlated with Bcl-2 gene expression level &#40;0&#46;745&#44; P &#60; 0&#46;05&#41;&#44; and negatively correlated with each of liver AFP level &#40;-0&#46;445&#44; P &#60; 0&#46;05&#41;&#44; serum MDA level &#40;-0&#46;662&#44; P &#60; 0&#46;05&#41;&#44; and hepatic SQSTM1 concentration &#40;-0&#46;451&#44; P &#60; 0&#46;05&#41;&#46; Bcl-2 gene expression level is negatively correlated with SQSTM1 concentration &#40;-0&#46;521&#44; P &#60; 0&#46;05&#41;&#44; and serum MDA level &#40;-0&#46;862&#44; P &#60; 0&#46;05&#41;&#46;</p><elsevierMultimedia ident="t0020"></elsevierMultimedia><elsevierMultimedia ident="f0060"></elsevierMultimedia></span></span><span id="s0110" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="st0135">Discussion</span><p id="p0175" class="elsevierStylePara elsevierViewall">The role of autophagy induced by curcumin in protection and treatment of HCC was assayed in this study&#46; Autophagy and apoptosis are both considered two different mechanisms for programmed cell death&#46; In this study&#44; we examined how curcumin affects both autophagy and apoptosis&#44; and how they affect HCC prognosis&#46; We are the first to investigate the effect of curcumin on both autophagy and apoptosis in TAA induced HCC&#44; and to relate these effects to the concentration of ROS&#46;</p><p id="p0180" class="elsevierStylePara elsevierViewall">The experimental model was designed to reach only the first dysplastic stage of HCC&#46; This is because autophagy has been proved to have different and even contradicting effects on HCC prognosis in both the dysplastic and tumor-forming stages of HCC&#46;<a class="elsevierStyleCrossRef" href="#bib0015"><span class="elsevierStyleSup">2</span></a> Cells in the late tumor stages are characterized from cells in the early stages in having higher metabolic activity&#44; which leads to higher levels of ROS&#46;<a class="elsevierStyleCrossRef" href="#bib0095"><span class="elsevierStyleSup">18</span></a><span class="elsevierStyleSup">&#44;</span><a class="elsevierStyleCrossRef" href="#bib0100"><span class="elsevierStyleSup">19</span></a> Based on that difference between the two stages&#44; it was found that inhibiting autophagy leads to excessive ROS accumulation which leads to cell death by apoptosis&#44; while in the dysplastic stage inhibiting autophagy was shown to lead to cell survival and cancer proliferation&#46;<a class="elsevierStyleCrossRef" href="#bib0015"><span class="elsevierStyleSup">2</span></a><span class="elsevierStyleSup">&#44;</span><a class="elsevierStyleCrossRef" href="#bib0105"><span class="elsevierStyleSup">20</span></a> In our work&#44; we aimed to investigate the hepatoprotective effect of activating autophagy in the dysplastic stage instead of inhibiting it in the late tumor-forming stage&#46;</p><p id="p0185" class="elsevierStylePara elsevierViewall">To investigate the involvement of autophagic pathway in the mechanism of curcumin&#39;s effect&#44; LC3-II gene expression&#44; and SQSTM1 concentration were measured&#44; and the results showed significant increase in LC3-II gene expression in Cur low-dose&#44; and Cur high-dose groups&#46; The results also showed significant decrease in SQSTM1 concentration with both curcumin doses&#46; Our results also indicated that curcumin lead to significantly decreasing HepG2 cells viability in a dose of 50 &#956;M&#46; This dose also showed a significant decrease in SQSTM1 concentration&#46; These results are in agreement with other studies that suggested that curcumin among other natural products leads to autophagic cell death&#46;<a class="elsevierStyleCrossRefs" href="#bib0110"><span class="elsevierStyleSup">21</span></a><span class="elsevierStyleSup">-</span><a class="elsevierStyleCrossRef" href="#bib0120"><span class="elsevierStyleSup">23</span></a></p><p id="p0190" class="elsevierStylePara elsevierViewall">The results of measuring the anti-apoptic Bcl-2 gene expression showed that curcumin significantly inhibited apoptosis in both concentrations&#46; A correlation study between curcumin&#39;s effect on both Bcl-2 gene expression levels&#44; and LC3-II gene expression levels showed significant high positive correlation &#40;r &#61; 0&#46;745&#44; P &#60; 0&#46;0001&#41;&#46; Thus&#44; our study shows that curcumin activates autophagy and simultaneously deactivates apoptosis&#46; Previous studies showed that autophagy and apoptosis can happen together&#44;<a class="elsevierStyleCrossRef" href="#bib0020"><span class="elsevierStyleSup">3</span></a> independently of each other&#44;<a class="elsevierStyleCrossRef" href="#bib0125"><span class="elsevierStyleSup">24</span></a> or activating one can actually lead to inhibiting the other&#46;<a class="elsevierStyleCrossRef" href="#bib0015"><span class="elsevierStyleSup">2</span></a> Studies have also suggested that curcumin may lead to cell death through apoptosis&#44;<a class="elsevierStyleCrossRef" href="#bib0130"><span class="elsevierStyleSup">25</span></a><span class="elsevierStyleSup">&#44;</span><a class="elsevierStyleCrossRef" href="#bib0135"><span class="elsevierStyleSup">26</span></a> or through autophagy without affecting apoptosis at all&#46;<a class="elsevierStyleCrossRef" href="#bib0125"><span class="elsevierStyleSup">24</span></a> Other studies also showed that apoptosis can be activated to treat different types of cancer&#44;<a class="elsevierStyleCrossRef" href="#bib0065"><span class="elsevierStyleSup">12</span></a> but in some cases cells are resistant to apoptosis&#44;<a class="elsevierStyleCrossRef" href="#bib0125"><span class="elsevierStyleSup">24</span></a> which makes an option like autophagic cell death much more valuable in treating of or protecting against cancer&#46;</p><p id="p0195" class="elsevierStylePara elsevierViewall">Results of this study showed that curcumin in both doses significantly blocked the elevation of AFP concentration found in TAA group&#46; Curcumin groups also significantly blocked the elevation in ALT and AST activities in TAA group&#46; Cur high-dose group significantly blocked serum albumin concentration reduction found in TAA group&#46; Histopathological examination of liver sections showed marked improvement in both curcumin groups than TAA group&#44; with more improvement in Cur highdose group&#46; These results show that curcumin in both doses help in protection against HCC induced by TAA in rats&#46; Correlation studies also showed significant correlations between LC3-II gene expression levels as a marker of autophagy and each of AFP concentration &#40;r &#61; - 0&#46;445&#44; P &#60; 0&#46;05&#41;&#44; ALT activity &#40;r &#61; - 0&#46;571&#44; P &#60;0&#46;05&#41;&#44; and AST activity &#40;r &#61; - 0&#46;579&#44; P &#60; 0&#46;05&#41;&#46;</p><p id="p0200" class="elsevierStylePara elsevierViewall">The induction or inhibition of autophagy to treat and protect against different types of cancer&#44; including HCC&#44; has been thoroughly studied recently&#46; Recent studies found that activating autophagic cell death can lead to a better cancer prognosis in many cancer types including cervical cancer&#44; nasopharyngeal carcinoma&#44; pancreas adenocarcinoma&#44; and HCC as it leads to cancer cell death&#46;<a class="elsevierStyleCrossRefs" href="#bib0140"><span class="elsevierStyleSup">27</span></a><span class="elsevierStyleSup">-</span><a class="elsevierStyleCrossRef" href="#bib0150"><span class="elsevierStyleSup">29</span></a> Other recent studies found that inhibition of autophagy may enhance the effect of some drugs like bevacizumab in treatment of HCC because autophagy in this case is used as a survival mechanism by cancer cells&#46;<a class="elsevierStyleCrossRef" href="#bib0130"><span class="elsevierStyleSup">25</span></a><span class="elsevierStyleSup">&#44;</span><a class="elsevierStyleCrossRef" href="#bib0155"><span class="elsevierStyleSup">30</span></a> A recent study suggested an explanation of this paradoxical role of autophagy in HCC by clarifying that the induction of autophagy treats cancer in the first dysplastic stage of HCC&#44; while in the later tumor-forming stages&#44; induction of autophagy leads to worse cancer prognosis&#46;<a class="elsevierStyleCrossRef" href="#bib0015"><span class="elsevierStyleSup">2</span></a></p><p id="p0205" class="elsevierStylePara elsevierViewall">This study also aimed to understand the relationship between activating autophagy and increasing ROS levels&#46; ROS play a vital role in the proliferation and survival of cancer cells&#46; However&#44; excessive ROS generation has been reported to cause cancer cell death through autophagic or apoptic pathways&#46;<a class="elsevierStyleCrossRef" href="#bib0050"><span class="elsevierStyleSup">9</span></a><span class="elsevierStyleSup">&#44;</span><a class="elsevierStyleCrossRef" href="#bib0160"><span class="elsevierStyleSup">31</span></a> TAA is known as a hepatocarcinogen that increases the hepatic concentration of ROS that leads to liver fibrosis&#44; cirrhosis&#44; and finally HCC&#46;<a class="elsevierStyleCrossRef" href="#bib0165"><span class="elsevierStyleSup">32</span></a><span class="elsevierStyleSup">&#44;</span><a class="elsevierStyleCrossRef" href="#bib0170"><span class="elsevierStyleSup">33</span></a> It also affects liver functions significantly&#44; and interferes with the liver&#39;s ability to synthesize proteins like albumin&#46;<a class="elsevierStyleCrossRef" href="#bib0175"><span class="elsevierStyleSup">34</span></a> In this study&#44; we measured SOD activity and found increased activity in curcumin groups compared with TAA group&#44; while MDA concentration showed significant decrease only in Cur low-dose group compared with TAA group&#46; This comes in agreement with other studies that state that curcumin has an antioxidant activity&#46;<a class="elsevierStyleCrossRef" href="#bib0180"><span class="elsevierStyleSup">35</span></a> Correlation studies showed significant negative correlation between MDA concentration as a marker of ROS level and each of LC3-II gene expression levels &#40;r &#61; - 0&#46;662&#44; P &#60; 0&#46;05&#41;&#44; Bcl-2 gene expression levels &#40;r &#61; - 0&#46;862&#44; P &#60; 0&#46;0001&#41;&#46;</p><p id="p0210" class="elsevierStylePara elsevierViewall">In both SOD and MDA&#44; Cur low-dose group showed significantly better antioxidant activity when compared with Cur high-dose group&#46; It was observed that Cur highdose had less distinct effect on decreasing oxidative stress that Cur low-dose&#46; Also&#44; in the in vitro experiment&#44; treating HepG2 cells with curcumin alone &#40;50 &#956;M&#41;&#44; and in combinations with NAC&#44; or with hydrogen peroxide&#44; showed that NAC decreased the effect of curcumin on HepG2 cells viability&#44; while hydrogen peroxide increased that effect &#40;<a class="elsevierStyleCrossRef" href="#f0065">Figure 12</a>&#41;&#46; The applied method of adding NAC and hydrogen peroxide separately to a certain drug to study and prove the involvement of ROS in its mechanism has been used to confirm that ROS can either increase or inhibit a certain effect of the drug&#46;<a class="elsevierStyleCrossRefs" href="#bib0185"><span class="elsevierStyleSup">36</span></a><span class="elsevierStyleSup">-</span><a class="elsevierStyleCrossRef" href="#bib0195"><span class="elsevierStyleSup">38</span></a> Results from our <span class="elsevierStyleItalic">in vitro</span> experiment come in agreement with a recent research article that demonstrated the involvement of ROS in the activation of autophagy using the same technique of adding a ROS initiator like hydrogen peroxide&#44; and a ROS scavenger like NAC but in a different model&#46;<a class="elsevierStyleCrossRef" href="#bib0200"><span class="elsevierStyleSup">39</span></a> These two results suggest that curcumin may initially lead to increasing ROS as a part of its mechanism to induce autophagy&#44; and activation of autophagy may then lead to decreasing ROS&#46;</p><elsevierMultimedia ident="f0065"></elsevierMultimedia><p id="p0215" class="elsevierStylePara elsevierViewall">This comes in agreement with recent studies which showed that in order for curcumin to induce autophagy&#44; it leads first to increasing ROS which in turn activates autophagy&#46;<a class="elsevierStyleCrossRef" href="#bib0115"><span class="elsevierStyleSup">22</span></a><span class="elsevierStyleSup">&#44;</span><a class="elsevierStyleCrossRef" href="#bib0205"><span class="elsevierStyleSup">40</span></a><span class="elsevierStyleSup">&#44;</span><a class="elsevierStyleCrossRef" href="#bib0210"><span class="elsevierStyleSup">41</span></a> Recent studies have further explained the relationship between ROS and autophagy&#44; showing that ROS could initiate autophagosome formation&#44; and autophagic degradation acting as cellular signaling molecules&#46;<a class="elsevierStyleCrossRef" href="#bib0215"><span class="elsevierStyleSup">42</span></a> Autophagy&#44; in contrast&#44; leads to reducing oxidative damage and ROS levels by removing protein aggregates and damaged cellular organelles such as mitochondria&#46;<a class="elsevierStyleCrossRef" href="#bib0220"><span class="elsevierStyleSup">43</span></a></p><p id="p0220" class="elsevierStylePara elsevierViewall"><a class="elsevierStyleCrossRef" href="#f0070">Figure 13</a> shows the suggested mechanism for curcumin&#39;s effect in protection and treatment of HCC&#46; The figure shows that TAA inhibits autophagy&#44; and that for curcumin to induce autophagy again it needs to increase the concentration of ROS first&#46; Once ROS concentration is increased and the process of autophagy is induced&#44; the concentration of SQSTM-1 decreases&#44; and the gene expression of LC3-II increases as shown in the results&#46; According to our findings&#44; when autophagy is induced in our model&#44; it also leads to inhibition of apoptosis which was evident by the gene expression levels of Bcl-2&#46; Finally&#44; when autophagy is activated&#44; it leads to decreasing the levels of ROS which is responsible for the hepatoprotective effect of curcumin in this early stage of HCC&#46;</p><elsevierMultimedia ident="f0070"></elsevierMultimedia><p id="p0225" class="elsevierStylePara elsevierViewall">Another interesting finding was that changing between different concentrations of curcumin can change the extent to which it inhibits apoptosis and activates autophagy&#46; Curcumin is even reported to induce apoptosis in some cases as discussed before&#46; In this study&#44; Cur high-dose showed a slightly better liver protection than Cur low-dose despite activating autophagy to a lesser extent&#46; This could be due to the fact that Cur high-dose group inhibited apoptosis less than Cur low-dose&#46; This suggests that a complete inhibition of apoptosis might not be beneficial&#44; and striking a certain balance between the two mechanisms of cell death can lead to achieving better results in HCC prevention and treatment&#46;</p></span><span id="s0115" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="st0140">Conclusion</span><p id="p0230" class="elsevierStylePara elsevierViewall">Finally&#44; curcumin protects against fibrosis and subsequent HCCup to the first dysplastic stage of HCC by up-regulating autophagy &#40;increasing LC3-II gene expression&#44; and decreasing SQSTM1 concentration&#41; and inhibiting apoptosis &#40;increasing Bcl-2 gene expression&#41;&#46; Cur highdose protected more against liver fibrosis by significantly blocking the increase in ALT&#44; AST&#44; and AFP concentrations&#44; and significantly blocking the reduction in albumin concentration caused by TAA&#46; Cur low-dose showed better antioxidant activities by blocking the increase in MDA concentration&#44; and decreasing the activity of SOD&#46; In vitro&#44; Curcumin50 &#956;M showed a significant decrease in HepG2 viability and in SQSTM1 concentration&#46; These findings suggest that curcumin and other autophagy activators can be used in protection against the early stages of HCC&#46; Studying how to manipulate autophagy levels in both early and late stages of HCC&#44; and a better understanding of the complicated relationship between autophagy and apoptosis can lead to better cancer treatment options&#46;</p></span><span id="s0120" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="st0145">Abbreviations</span><p id="p0235" class="elsevierStylePara elsevierViewall"><ul class="elsevierStyleList" id="l0015"><li class="elsevierStyleListItem" id="u0025"><span class="elsevierStyleLabel">&#8226;</span><p id="p0240" class="elsevierStylePara elsevierViewall"><span class="elsevierStyleBold">AFP&#58;</span> &#945;-fetoprotein&#46;</p></li><li class="elsevierStyleListItem" id="u0030"><span class="elsevierStyleLabel">&#8226;</span><p id="p0245" class="elsevierStylePara elsevierViewall"><span class="elsevierStyleBold">ALT&#58;</span> alanine aminotransferase&#46;</p></li><li class="elsevierStyleListItem" id="u0035"><span class="elsevierStyleLabel">&#8226;</span><p id="p0250" class="elsevierStylePara elsevierViewall"><span class="elsevierStyleBold">AST&#58;</span> aspartate aminotransferase&#46;</p></li><li class="elsevierStyleListItem" id="u0040"><span class="elsevierStyleLabel">&#8226;</span><p id="p0255" class="elsevierStylePara elsevierViewall"><span class="elsevierStyleBold">Cur High-dose&#58;</span> curcumin high-dose&#46;</p></li><li class="elsevierStyleListItem" id="u0045"><span class="elsevierStyleLabel">&#8226;</span><p id="p0260" class="elsevierStylePara elsevierViewall"><span class="elsevierStyleBold">Cur low-dose&#58;</span> curcumin low-dose&#46;</p></li><li class="elsevierStyleListItem" id="u0050"><span class="elsevierStyleLabel">&#8226;</span><p id="p0265" class="elsevierStylePara elsevierViewall"><span class="elsevierStyleBold">GAPDH&#58;</span> glyceraldehyde 3-phosphate dehydrogenase&#46;</p></li><li class="elsevierStyleListItem" id="u0055"><span class="elsevierStyleLabel">&#8226;</span><p id="p0270" class="elsevierStylePara elsevierViewall"><span class="elsevierStyleBold">H&#38;E&#58;</span> hematoxylin and eosin&#46;</p></li><li class="elsevierStyleListItem" id="u0060"><span class="elsevierStyleLabel">&#8226;</span><p id="p0275" class="elsevierStylePara elsevierViewall"><span class="elsevierStyleBold">HCC&#58;</span> hepatocellular carcinoma&#46;</p></li><li class="elsevierStyleListItem" id="u0065"><span class="elsevierStyleLabel">&#8226;</span><p id="p0280" class="elsevierStylePara elsevierViewall"><span class="elsevierStyleBold">LC3-II&#58;</span> microtubule-associated protein light chain 3-II&#46;</p></li><li class="elsevierStyleListItem" id="u0070"><span class="elsevierStyleLabel">&#8226;</span><p id="p0285" class="elsevierStylePara elsevierViewall"><span class="elsevierStyleBold">MDA&#58;</span> malondialdhyde&#46;</p></li><li class="elsevierStyleListItem" id="u0075"><span class="elsevierStyleLabel">&#8226;</span><p id="p0290" class="elsevierStylePara elsevierViewall"><span class="elsevierStyleBold">NAC&#58;</span> N-Acetyl Cysteine&#46;</p></li><li class="elsevierStyleListItem" id="u0080"><span class="elsevierStyleLabel">&#8226;</span><p id="p0295" class="elsevierStylePara elsevierViewall"><span class="elsevierStyleBold">PCR&#58;</span> real-time polymerase chain reaction&#46;</p></li><li class="elsevierStyleListItem" id="u0085"><span class="elsevierStyleLabel">&#8226;</span><p id="p0300" class="elsevierStylePara elsevierViewall"><span class="elsevierStyleBold">SOD&#58;</span> superoxide dismutase&#46;</p></li><li class="elsevierStyleListItem" id="u0090"><span class="elsevierStyleLabel">&#8226;</span><p id="p0305" class="elsevierStylePara elsevierViewall"><span class="elsevierStyleBold">SQSTM1&#58;</span> sequestosome-1&#46;</p></li><li class="elsevierStyleListItem" id="u0095"><span class="elsevierStyleLabel">&#8226;</span><p id="p0310" class="elsevierStylePara elsevierViewall"><span class="elsevierStyleBold">TAA&#58;</span> thioacetamide&#46;</p></li></ul></p></span></span>"
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        0 => array:3 [
          "identificador" => "xres1207270"
          "titulo" => "Abstract"
          "secciones" => array:3 [
            0 => array:2 [
              "identificador" => "abs0010"
              "titulo" => "Background and rationale"
            ]
            1 => array:2 [
              "identificador" => "abs0015"
              "titulo" => "Results"
            ]
            2 => array:2 [
              "identificador" => "abs0020"
              "titulo" => "Conclusions"
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          "identificador" => "xpalclavsec1124316"
          "titulo" => "Keywords"
        ]
        2 => array:2 [
          "identificador" => "s0010"
          "titulo" => "Introduction"
        ]
        3 => array:3 [
          "identificador" => "s0015"
          "titulo" => "Material and Methods"
          "secciones" => array:2 [
            0 => array:3 [
              "identificador" => "s0020"
              "titulo" => "A in vitro Study"
              "secciones" => array:2 [
                0 => array:2 [
                  "identificador" => "s0025"
                  "titulo" => "Cell Line"
                ]
                1 => array:2 [
                  "identificador" => "s0030"
                  "titulo" => "MTT Assay"
                ]
              ]
            ]
            1 => array:3 [
              "identificador" => "s0035"
              "titulo" => "In vivo Study"
              "secciones" => array:8 [
                0 => array:2 [
                  "identificador" => "s0040"
                  "titulo" => "Animals and their treatment outlines"
                ]
                1 => array:2 [
                  "identificador" => "s0045"
                  "titulo" => "Collection of samples"
                ]
                2 => array:2 [
                  "identificador" => "s0050"
                  "titulo" => "Histopathological analysis of hepatic tissue"
                ]
                3 => array:2 [
                  "identificador" => "s0055"
                  "titulo" => "Liver function tests"
                ]
                4 => array:2 [
                  "identificador" => "s0060"
                  "titulo" => "Assessment of oxidative stress"
                ]
                5 => array:2 [
                  "identificador" => "s0065"
                  "titulo" => "Determination of SQSTM1 concentration"
                ]
                6 => array:2 [
                  "identificador" => "s0070"
                  "titulo" => "Gene expression of LC3-II&#44; and Bcl-2 by quantitative real-time polymerase chain reaction &#40;RT-PCR&#41;"
                ]
                7 => array:2 [
                  "identificador" => "s0075"
                  "titulo" => "Statistical analysis"
                ]
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        ]
        4 => array:3 [
          "identificador" => "s0080"
          "titulo" => "RESULTS"
          "secciones" => array:5 [
            0 => array:2 [
              "identificador" => "s0085"
              "titulo" => "Effect of Curcumin low-dose and Curcumin high-dose on survival percent"
            ]
            1 => array:2 [
              "identificador" => "s0090"
              "titulo" => "Hepatoprotective effect of Curcumin low-dose and Curcumin high-dose in HCC induced by TAA in rats"
            ]
            2 => array:2 [
              "identificador" => "s0095"
              "titulo" => "Oxidative stress markers"
            ]
            3 => array:2 [
              "identificador" => "s0100"
              "titulo" => "Effect of Curcumin low-dose and Curcumin high-dose on autophagic and apoptic pathway"
            ]
            4 => array:2 [
              "identificador" => "s0105"
              "titulo" => "The correlation analysis of studied parameters"
            ]
          ]
        ]
        5 => array:2 [
          "identificador" => "s0110"
          "titulo" => "Discussion"
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        6 => array:2 [
          "identificador" => "s0115"
          "titulo" => "Conclusion"
        ]
        7 => array:2 [
          "identificador" => "s0120"
          "titulo" => "Abbreviations"
        ]
        8 => array:1 [
          "titulo" => "References"
        ]
      ]
    ]
    "pdfFichero" => "main.pdf"
    "tienePdf" => true
    "fechaRecibido" => "2016-09-14"
    "fechaAceptado" => "2016-12-14"
    "PalabrasClave" => array:1 [
      "en" => array:1 [
        0 => array:4 [
          "clase" => "keyword"
          "titulo" => "Keywords"
          "identificador" => "xpalclavsec1124316"
          "palabras" => array:5 [
            0 => "Liver fibrosis"
            1 => "LC3-II"
            2 => "SQSTM1"
            3 => "Bcl-2"
            4 => "ROS"
          ]
        ]
      ]
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      "en" => array:3 [
        "titulo" => "Abstract"
        "resumen" => "<span id="abs0010" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="st0015"><span class="elsevierStyleBold">Background and rationale</span></span><p id="sp0090" class="elsevierStyleSimplePara elsevierViewall">Microtubule-associated protein light chain 3-II &#40;LC3-II&#41;&#44; and Sequestosome-1 &#40;SQSTM1&#41; are proteins that can be used as markers for autophagic pathway&#46; Bcl-2 protein is reported to be inversely correlated with apoptosis&#46; We aimed to investigate the effects of curcumin on liver inflammation and fibrosis up to the first dysplastic stage of Hepatocellular carcinoma &#40;HCC&#41; induced by Thioacetamide &#40;TAA&#41; in rats and to clarify the effects of curcumin on LC3-II&#44; SQSTM1&#44; and Bcl-2&#46; Male Sprague-Dawley rats were randomized into four groups&#58; Control group&#44; TAA group&#44; Curcumin low-dose group&#44; and Curcumin highdose group&#46; The last three groups received TAA 200 mg&#47;kg i&#46;p&#46; twice weekly for 18 weeks&#46; Oxidative stress markers as hepatic malondialdehyde &#40;MDA&#41; concentration and superoxide dismutase &#40;SOD&#41; activity were measured by colorimetric methods&#46; Hepatic SQSTM1 concentration was measured by ELISA&#44; and gene expression levels of Bcl-2&#44; and LC3-II were measured by RT-PCR&#46;We also investigated the <span class="elsevierStyleItalic">in vitro</span> effect of curcumin on HepG2 cells viability through MTT assay&#44; and the involvement of autophagy in this effect&#46;</p></span> <span id="abs0015" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="st0020"><span class="elsevierStyleBold">Results</span></span><p id="sp0095" class="elsevierStyleSimplePara elsevierViewall">Curcumin increased the survival percent in rats&#44; decreased -fetoprotein &#40;AFP&#41; concentration&#44; and serum aspartate aminotransferase &#40;AST&#41; activity&#44; and increased serum albumin concentration&#46; Curcumin also significantly reduced oxidative stress in liver&#44; inhibited apoptosis&#44; and induced autophagy&#46; <span class="elsevierStyleItalic">In vitro</span>&#44; curcumin &#40;50 &#956;M&#41; decreased HepG2 cells viabilityand the concentration of SQSTM1&#46;</p></span> <span id="abs0020" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="st0025"><span class="elsevierStyleBold">Conclusions</span></span><p id="sp0100" class="elsevierStyleSimplePara elsevierViewall">Curcumin leads to protection against TAA induced HCC up to the first dysplastic stage through activating autophagic pathway and inhibiting apoptosis&#46; Also&#44; the antioxidant activity of curcumin almost prevents liver fibrosis&#46;</p></span>"
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          0 => array:2 [
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            "titulo" => "Background and rationale"
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            "titulo" => "Results"
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            "titulo" => "Conclusions"
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          "en" => "<p id="sp0010" class="elsevierStyleSimplePara elsevierViewall">Kaplan-Meier survival percent curve of rats in Thioacetamide &#40;TAA&#41;&#44; Cur low-dose &#40;100 mg&#47;kg&#41;&#44; and Cur high-dose &#40;200 mg&#47;kg&#41; groups&#46;</p>"
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          "en" => "<p id="sp0015" class="elsevierStyleSimplePara elsevierViewall">Cell viability level &#40;mean &#177; SE&#41; in HepG2 cell line of &#40;50&#44; 40&#44; 20&#44; 10&#44; 5 &#956;M of curcumin&#41; relative to the control group&#46; &#42; Significant against control group at P &#60; 0&#46;05&#46;</p>"
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          "en" => "<p id="sp0020" class="elsevierStyleSimplePara elsevierViewall">Effect of Cur low-dose &#40;100 mg&#47;kg&#41; and Cur high-dose &#40;200 mg&#47; kg&#41; on serum -fetoprotein &#40;AFP&#41; concentration &#40;mean &#177; SE&#41; in Thioacetamide &#40;200 mg&#47;kg&#41; induced HCC&#46; &#42; Significant against control group at P &#60; 0&#46;05&#46; <span class="elsevierStyleSup">&#35;</span> Significant against TAA group at P &#60; 0&#46;05&#46;</p>"
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          "en" => "<p id="sp0025" class="elsevierStyleSimplePara elsevierViewall">Liver sections stained with H&#47;E&#44; and Masson Trichrome of Control&#44; TAA &#40;thioacetamide 200 mg&#47;kg twice weekly&#41;&#44; Cur low-dose &#40;100 mg&#47;kg daily&#41;&#44; and Cur high-dose &#40;200 mg&#47;kg daily&#41; groups&#46; Upper panel shows more improvement in Cur high-dose group than Cur low-dose group compared to marked necroinflammatory changes with dysplastic nodules in the TAA group&#46; Lower panel showed marked collagen deposition with complete cirrhosis in TAA group with reduction of collagen deposition in Cur high-dose group than Cur low-dose group&#46;</p>"
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          "en" => "<p id="sp0030" class="elsevierStyleSimplePara elsevierViewall">Effect of Cur low-dose &#40;100 mg&#47;kg&#41; and Cur high-dose &#40;200 mg&#47; kg&#41; on hepatic superoxide dismutase activity &#40;SOD&#41; &#40;mean &#177; SE&#41; in Thioacetamide &#40;200 mg&#47;kg&#41; induced HCC&#46; &#42; Significant against control group at P &#60; 0&#46;05&#46; <span class="elsevierStyleSup">&#35;</span> Significant against TAA group at P &#60; 0&#46;05&#46; <span class="elsevierStyleSup">&#8224;</span> Significant against Cur low-dose group at P &#60; 0&#46;05&#46;</p>"
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          "en" => "<p id="sp0035" class="elsevierStyleSimplePara elsevierViewall">Effect of Cur low-dose &#40;100 mg&#47;kg&#41; and Cur high-dose &#40;200 mg&#47; kg&#41; on hepatic malondialdehyde &#40;MDA&#41; concetration &#40;mean &#177; SE&#41; in Thioacetamide &#40;200 mg&#47;kg&#41; induced HCC&#46; &#42; Significant against control group at P &#60; 0&#46;05&#46; <span class="elsevierStyleSup">&#35;</span> Significant against TAA group at P &#60; 0&#46;05&#46; <span class="elsevierStyleSup">&#8224;</span> Significant against Cur low-dose group at P &#60; 0&#46;05&#46;</p>"
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          "en" => "<p id="sp0040" class="elsevierStyleSimplePara elsevierViewall">Effect of Cur low-dose &#40;100 mg&#47;kg&#41; and Cur high-dose &#40;200 mg&#47;kg&#41; on liver sequestosome-1 &#40;SQSTM1&#41; concetration &#40;mean &#177; SE&#41; in Thioacetamide &#40;200 mg&#47;kg&#41; induced HCC&#46; <span class="elsevierStyleSup">&#35;</span> Significant against TAA group at P &#60; 0&#46;05&#46;</p>"
        ]
      ]
      7 => array:7 [
        "identificador" => "f0045"
        "etiqueta" => "Figure 8"
        "tipo" => "MULTIMEDIAFIGURA"
        "mostrarFloat" => true
        "mostrarDisplay" => false
        "figura" => array:1 [
          0 => array:4 [
            "imagen" => "gr8.jpeg"
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          "en" => "<p id="sp0045" class="elsevierStyleSimplePara elsevierViewall">Effect of Cur low-dose &#40;100 mg&#47;kg&#41; and Cur high-dose &#40;200 mg&#47; kg&#41; on microtubule-associated protein light chain 3 II &#40;LC3-II&#41; gene expression levels &#40;mean &#177; SE&#41; in Thioacetamide &#40;200 mg&#47;kg&#41; induced HCC&#46; &#42; Significant against control group at P &#60; 0&#46;05&#46; <span class="elsevierStyleSup">&#35;</span>Significant against TAA group at P &#60; 0&#46;05&#46; <span class="elsevierStyleSup">&#8224;</span> Significant against Cur low-dose group at P &#60; 0&#46;05&#46;</p>"
        ]
      ]
      8 => array:7 [
        "identificador" => "f0050"
        "etiqueta" => "Figure 9"
        "tipo" => "MULTIMEDIAFIGURA"
        "mostrarFloat" => true
        "mostrarDisplay" => false
        "figura" => array:1 [
          0 => array:4 [
            "imagen" => "gr9.jpeg"
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          "en" => "<p id="sp0050" class="elsevierStyleSimplePara elsevierViewall">Sequestosome-1 &#40;SQSTM1&#41; concentration &#40;mean &#177; SE&#41; in HepG2 cell line in control and with 50 &#956;M of curcumin&#46; &#42; Significant against control group at P &#60; 0&#46;05&#46;</p>"
        ]
      ]
      9 => array:7 [
        "identificador" => "f0055"
        "etiqueta" => "Figure 10"
        "tipo" => "MULTIMEDIAFIGURA"
        "mostrarFloat" => true
        "mostrarDisplay" => false
        "figura" => array:1 [
          0 => array:4 [
            "imagen" => "gr10.jpeg"
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          "en" => "<p id="sp0055" class="elsevierStyleSimplePara elsevierViewall">Effect of Cur low-dose &#40;100 mg&#47;kg&#41; and Cur high-dose &#40;200 mg&#47;kg&#41; on Bcl-2 gene expression levels &#40;mean &#177; SE&#41; in Thioacetamide &#40;200 mg&#47;kg&#41; induced HCC&#46; &#42; Significant against control group at P &#60; 0&#46;05&#46; <span class="elsevierStyleSup">&#35;</span> Significant against TAA group at P &#60; 0&#46;05&#46; <span class="elsevierStyleSup">&#8224;</span> Significant against Cur low-dose group at P &#60; 0&#46;05&#46;</p>"
        ]
      ]
      10 => array:7 [
        "identificador" => "f0060"
        "etiqueta" => "Figure 11"
        "tipo" => "MULTIMEDIAFIGURA"
        "mostrarFloat" => true
        "mostrarDisplay" => false
        "figura" => array:1 [
          0 => array:4 [
            "imagen" => "gr11.jpeg"
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          "en" => "<p id="sp0060" class="elsevierStyleSimplePara elsevierViewall">Significant correlation between hepatic gene expression levels of LC3-II with &#40;<span class="elsevierStyleBold">A</span>&#41; hepatic gene expression levels of Bcl-2 &#40;r &#61; 0&#46;745&#44; P &#60; 0&#46;0001&#41;&#44; &#40;<span class="elsevierStyleBold">B</span>&#41; SQSTM1 concentration &#40;r &#61; -0&#46;451&#44; P &#60; 0&#46;05&#41;&#44; &#40;<span class="elsevierStyleBold">C</span>&#41; MDA concentration &#40;r &#61; -0&#46;662&#44; P &#60; 0&#46;05&#41;&#44; &#40;<span class="elsevierStyleBold">D</span>&#41; Serum AST activity &#40;r &#61; -0&#46;579&#44; P &#60; 0&#46;05&#41;&#44; &#40;<span class="elsevierStyleBold">E</span>&#41; Serum ALT activity &#40;r &#61; -0&#46;571&#44; P &#60; 0&#46;05&#41;&#44; and &#40;<span class="elsevierStyleBold">F</span>&#41; AFP concentration &#40;r &#61; -0&#46;445&#44; P &#60; 0&#46;05&#41;&#44; and between hepatic gene expression levels of Bcl-2 with &#40;<span class="elsevierStyleBold">G</span>&#41; SQSTM1 concentration &#40;r &#61; -0&#46;521&#44; P &#60; 0&#46;05&#41;&#44; and &#40;<span class="elsevierStyleBold">H</span>&#41; MDA concentration &#40;r &#61; -0&#46;862&#44; P &#60; 0&#46;0001&#41;&#46;</p>"
        ]
      ]
      11 => array:7 [
        "identificador" => "f0065"
        "etiqueta" => "Figure 12"
        "tipo" => "MULTIMEDIAFIGURA"
        "mostrarFloat" => true
        "mostrarDisplay" => false
        "figura" => array:1 [
          0 => array:4 [
            "imagen" => "gr12.jpeg"
            "Alto" => 668
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            "Tamanyo" => 52212
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        "descripcion" => array:1 [
          "en" => "<p id="sp0065" class="elsevierStyleSimplePara elsevierViewall">MTT assay of viability of HepG2 cells with control&#44; curcumin 50 &#956;M alone&#44; curcumin 50 &#956;M with N-Acetyl Cysteine &#40;NAC&#41;&#44; and curcumin 50 &#956;M with hydrogen peroxide&#46; &#42; Significant against control group at P &#60; 0&#46;05&#46; <span class="elsevierStyleSup">&#35;</span> Significant against curcumin 50 &#956;M group at P &#60; 0&#46;05&#46;</p>"
        ]
      ]
      12 => array:7 [
        "identificador" => "f0070"
        "etiqueta" => "Figure 13"
        "tipo" => "MULTIMEDIAFIGURA"
        "mostrarFloat" => true
        "mostrarDisplay" => false
        "figura" => array:1 [
          0 => array:4 [
            "imagen" => "gr13.jpeg"
            "Alto" => 1039
            "Ancho" => 1380
            "Tamanyo" => 112807
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        "descripcion" => array:1 [
          "en" => "<p id="sp0070" class="elsevierStyleSimplePara elsevierViewall">Postulated mechanism for the effect of curcumin on autophagic and apoptic pathways&#44; and ROS in Thioacetamide induced HCC&#46;</p>"
        ]
      ]
      13 => array:7 [
        "identificador" => "t0010"
        "etiqueta" => "Table 1"
        "tipo" => "MULTIMEDIATABLA"
        "mostrarFloat" => true
        "mostrarDisplay" => false
        "tabla" => array:1 [
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                0 => """
                  <table border="0" frame="\n
                  \t\t\t\t\tvoid\n
                  \t\t\t\t" class=""><thead title="thead"><tr title="table-row"><th class="td" title="\n
                  \t\t\t\t\ttable-head\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t" scope="col" style="border-bottom: 2px solid black">Gene&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t\t\t</th><th class="td" title="\n
                  \t\t\t\t\ttable-head\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t" scope="col" style="border-bottom: 2px solid black">Sequence&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t\t\t</th></tr></thead><tbody title="tbody"><tr title="table-row"><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">Rat <span class="elsevierStyleItalic">LC3-II</span> forward&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">CTCATCCGGGAGCAGCAT&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">Rat <span class="elsevierStyleItalic">LC3-II</span> reverse&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">CTCACCCTTGTATCGCTCTATAATCA&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">Rat <span class="elsevierStyleItalic">Bcl-2</span> forward&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">ATCGCTCTGTGGATGACTGAGTAC&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">Rat <span class="elsevierStyleItalic">Bcl-2</span> reverse&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">AGAGACAGCCAGGAGAAATCAAAC&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">Rat <span class="elsevierStyleItalic">GAPDH</span> forward&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">AAGTTCAACGGCACAGTCAAGG&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">Rat <span class="elsevierStyleItalic">GAPDH</span> reverse&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">CATACTCAGCACCAGCATCACC&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr></tbody></table>
                  """
              ]
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        "descripcion" => array:1 [
          "en" => "<p id="sp0075" class="elsevierStyleSimplePara elsevierViewall">Primer sequences used for the RT-PCR step&#46;</p>"
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      14 => array:8 [
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        "etiqueta" => "Table 2"
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        "mostrarFloat" => true
        "mostrarDisplay" => false
        "fuente" => "Values&#58; &#40;mean &#177; SE&#41;&#46; &#42; Significant against control group at P &#60; 0&#46;05&#46; <span class="elsevierStyleSup">&#35;</span> Significant against TAA group at P &#60; 0&#46;05&#46; <span class="elsevierStyleSup">&#8224;</span> Significant against Cur low-dose group at P &#60; 0&#46;05&#46;"
        "tabla" => array:1 [
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                  <table border="0" frame="\n
                  \t\t\t\t\tvoid\n
                  \t\t\t\t" class=""><thead title="thead"><tr title="table-row"><th class="td" title="\n
                  \t\t\t\t\ttable-head\n
                  \t\t\t\t  " align="left" valign="\n
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                  \t\t\t\t" scope="col" style="border-bottom: 2px solid black">Group&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t\t\t</th><th class="td" title="\n
                  \t\t\t\t\ttable-head\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t" scope="col" style="border-bottom: 2px solid black">Rats &#40;n&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t\t\t</th><th class="td" title="\n
                  \t\t\t\t\ttable-head\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t" scope="col" style="border-bottom: 2px solid black">ALT activity &#40;U&#47;L&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t\t\t</th><th class="td" title="\n
                  \t\t\t\t\ttable-head\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t" scope="col" style="border-bottom: 2px solid black">AST activity &#40;U&#47;L&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t\t\t</th><th class="td" title="\n
                  \t\t\t\t\ttable-head\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t" scope="col" style="border-bottom: 2px solid black">Albumin concentration &#40;g&#47;dL&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t\t\t</th></tr></thead><tbody title="tbody"><tr title="table-row"><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
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                  \t\t\t\t">Control&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">10&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">61&#46;01 &#177; 3&#46;97&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">45&#46;46 &#177; 1&#46;46&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">5&#46;57 &#177; 0&#46;09&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">TAA&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">8&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">167&#46;60 &#177; 2&#46;60 &#42;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">97&#46;46 &#177; 1&#46;21 &#42;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">4&#46;67 &#177; 0&#46;15 &#42;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">Cur low-dose&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">10&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">96&#46;08 &#177; 2&#46;93 &#42;<span class="elsevierStyleSup">&#35;</span>&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">61&#46;36 &#177; 2&#46;39 &#42;&#44;<span class="elsevierStyleSup">&#35;</span>&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">4&#46;71 &#177; 0&#46;12 &#42;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">Cur high-dose&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">8&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">86&#46;52 &#177; 2&#46;41 &#42;<span class="elsevierStyleSup">&#35;</span>&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">67&#46;48 &#177; 1&#46;36 &#42;&#44;<span class="elsevierStyleSup">&#35;</span>&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">5&#46;61 &#177; 0&#46;17 <span class="elsevierStyleSup">&#35;&#44;&#8224;</span>&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr></tbody></table>
                  """
              ]
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        "descripcion" => array:1 [
          "en" => "<p id="sp0080" class="elsevierStyleSimplePara elsevierViewall">Effect of Cur low-dose &#40;100 mg&#47;kg&#41; and Cur high-dose &#40;200 mg&#47;kg&#41; on serum Alanine aminotransferase activity &#40;ALT&#41;&#44; Aspartate aminotransferase activity &#40;AST&#41;&#44; and albumin concentration in Thioacetamide &#40;200 mg&#47;kg&#41; induced HCC&#46;</p>"
        ]
      ]
      15 => array:8 [
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        "etiqueta" => "Table 3"
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        "fuente" => "&#42; Correlation is significant at P &#60; 0&#46;05 level&#46;"
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                  <table border="0" frame="\n
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                  \t\t\t\t" scope="col" style="border-bottom: 2px solid black">&nbsp;\t\t\t\t\t\t\n
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Article information

ISSN: 16652681
Original language: English

DOI:10.5604/01.3001.0010.0307

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Year/Month	Html	Pdf	Total

2024 November	8	2	10
2024 October	55	12	67
2024 September	54	6	60
2024 August	52	4	56
2024 July	49	3	52
2024 June	60	6	66
2024 May	76	21	97
2024 April	50	13	63
2024 March	84	20	104
2024 February	92	23	115
2024 January	63	17	80
2023 December	43	16	59
2023 November	36	12	48
2023 October	56	17	73
2023 September	37	13	50
2023 August	23	7	30
2023 July	30	3	33
2023 June	23	3	26
2023 May	64	10	74
2023 April	67	4	71
2023 March	49	6	55
2023 February	62	12	74
2023 January	58	10	68
2022 December	30	14	44
2022 November	55	7	62
2022 October	63	1	64
2022 September	40	7	47
2022 August	37	6	43
2022 July	24	19	43
2022 June	14	5	19
2022 May	10	5	15
2022 April	20	4	24
2022 March	32	9	41
2022 February	45	13	58
2022 January	59	15	74
2021 December	26	16	42
2021 November	26	12	38
2021 October	49	17	66
2021 September	39	10	49
2021 August	62	6	68
2021 July	33	17	50
2021 June	27	10	37
2021 May	32	16	48
2021 April	79	33	112
2021 March	44	34	78
2021 February	33	29	62
2021 January	32	18	50
2020 December	30	24	54
2020 November	36	19	55
2020 October	25	18	43
2020 September	27	9	36
2020 August	26	14	40
2020 July	30	18	48
2020 June	21	4	25
2020 May	29	13	42
2020 April	32	11	43
2020 March	42	6	48
2020 February	28	2	30
2020 January	25	13	38
2019 December	23	11	34
2019 November	14	11	25
2019 October	12	5	17
2019 September	17	3	20
2019 August	8	8	16
2019 July	3	10	13
2019 June	3	12	15

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