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REVIEW
Hydrogen, a potential safeguard for graft-versus-host disease and graft ischemia-reperfusion injury?
Lijuan YuanI, Jianliang ShenII,
Corresponding author
nghxyk@163.com

Corresponding author
I Anhui Medical University, Postgraduate School, Hefei, China
II Navy General Hospital, Department of Hematology, Beijing, China
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    "textoCompleto" => "<span class="elsevierStyleSections"><span id="cesec10" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="cestitle10">INTRODUCTION</span><p id="para10" class="elsevierStylePara elsevierViewall">Transplantation is a therapeutic modality in which healthy cells&#44; tissues&#44; or organs &#40;an autograft or allograft&#41; are transplanted to restore the anatomical structure and function of damaged organs or tissues&#46; This approach is the final treatment choice for untreatable diseases and end-stage organ diseases <a class="elsevierStyleCrossRef" href="#bib1">1</a>&#46; Organ transplantation leads to benefits such as functional recovery and prolonged survival&#44; but post-transplantation complications such as ischemia-reperfusion &#40;I&#47;R&#41; injury and acute graft-<span class="elsevierStyleItalic">versus</span>-host disease &#40;aGVHD&#41; remain major challenges <a class="elsevierStyleCrossRefs" href="#bib2">2&#8211;4</a>&#46; These complications reduce patients&#39; quality of life&#44; increase medical costs&#44; and worsen prognosis&#46;</p><span id="cesec20" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="cestitle20">Graft ischemia-reperfusion injury</span><p id="para20" class="elsevierStylePara elsevierViewall">During the process of transplantation&#44; blood flow to the organ to be transplanted is interrupted&#44; leading to ischemia that can damage the organ&#46; In addition&#44; restoration of blood flow to the transplanted organ may result in local and systemic inflammatory responses that can increase tissue injury&#46; Graft I&#47;R injury is characterized by reactive oxygen species &#40;ROS&#41; production&#44; complement activation&#44; leukocyte infiltration&#44; platelet-leukocyte aggregation&#44; increased microvascular permeability&#44; and decreased endothelium-dependent relaxation <a class="elsevierStyleCrossRef" href="#bib5">5</a>&#44;<a class="elsevierStyleCrossRef" href="#bib6">6</a>&#46; In the process of prolonged ischemia&#44; adenosine triphosphate &#40;ATP&#41; levels and intracellular pH decrease because of anaerobic metabolism&#44; leading to lactate accumulation&#46; In addition&#44; increased intracellular and mitochondrial calcium levels &#40;calcium overload&#41; are observed because certain ATPase-dependent ion transport mechanisms become dysfunctional <a class="elsevierStyleCrossRef" href="#bib7">7</a>&#46; This calcium overload leads to cell swelling and rupture as well as cell death by necrotic&#44; necroptotic&#44; apoptotic and autophagic mechanisms&#46;</p><p id="para30" class="elsevierStylePara elsevierViewall">Graft I&#47;R injury is manifested by increased inflammation mediated by the complement system and cytokines&#46; Once activated&#44; the complement pathway damages the transplanted organ&#39;s cells by attacking the plasma membrane or recruiting&#47;activating neutrophils <a class="elsevierStyleCrossRef" href="#bib8">8</a>&#44;<a class="elsevierStyleCrossRef" href="#bib9">9</a>&#46; Cytokines may play either pro- or anti-inflammatory roles&#46; Among others&#44; tumor necrosis factor &#40;TNF&#41;-&#945; is central in graft I&#47;R injury <a class="elsevierStyleCrossRef" href="#bib10">10</a>&#46; Increased TNF-&#945; in the graft will lead to increased neutrophil recruitment&#44; increased ROS production and activation of the NF-&#954;B and JNK pathways <a class="elsevierStyleCrossRef" href="#bib11">11</a>&#46; Other cytokines are also involved&#58; interleukin &#40;IL&#41;-1&#946;&#44; IL-18&#44; and interferon &#40;IFN&#41;-&#947; increase damage&#44; while IL-6&#44; IL-10&#44; and IL-13 attempt to control the damage <a class="elsevierStyleCrossRef" href="#bib10">10</a>&#46; In its severest form&#44; I&#47;R injury can lead to dysfunction and possibly death of the transplanted organ <a class="elsevierStyleCrossRef" href="#bib5">5</a>&#44;<a class="elsevierStyleCrossRef" href="#bib6">6</a>&#44;<a class="elsevierStyleCrossRef" href="#bib12">12</a>&#46;</p></span><span id="cesec30" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="cestitle30">Graft-<span class="elsevierStyleItalic">versus</span>-host disease</span><p id="para40" class="elsevierStylePara elsevierViewall">GVHD is a severe complication of organ transplantation&#44; resulting in morbidity and mortality&#46; GVHD consists of three phases&#44; and several of the involved mechanisms are shared with the classical mechanisms of I&#47;R injury&#46; During the first phase&#44; tissues are damaged by the recipient&#39;s conditioning regimen&#44; which leads to the release of inflammatory cytokines such as TNF-&#945;&#44; IL-1&#44; and IL-7 <a class="elsevierStyleCrossRef" href="#bib13">13</a>&#46; These cytokines induce activation of host antigen-presenting cells &#40;APCs&#41;&#46; During the second phase of GVHD&#44; the host APCs activate the donors&#39; cells through IL-12 and IL-23 release&#44; resulting in the production of Th1-related cytokines such as IL-2&#44; IL-6&#44; and TNF-&#947;&#46; IL-10 downregulates the synthesis of these cytokines&#44; but it is usually itself downregulated in the inflammatory context&#46; The activated Th1 cells from the donor secrete IFN-&#947; to induce secretion of indoleamine 2&#46;3-dioxygenase by the host APCs&#44; thus stimulating immunotolerizing Tregs&#46; IFN-&#947; also stimulates mononuclear cells to secrete IL-1 and TNF-&#945;&#44; which are inflammatory cytokines <a class="elsevierStyleCrossRef" href="#bib13">13</a>&#46; Finally&#44; in the third phase&#44; the Th1 cells promote the proliferation and differentiation of cytotoxic T lymphocytes &#40;CTLs&#41; and stimulate natural killer &#40;NK&#41; cells&#44; which in turn induce apoptosis of the cells of the transplanted organ <a class="elsevierStyleCrossRef" href="#bib14">14</a>&#46; Cellular and inflammatory cytokines such as TNF-&#947;&#44; IL-1&#44; and IL-6 then directly assault various host tissues&#44; leading to the clinical manifestations of GVHD <a class="elsevierStyleCrossRef" href="#bib15">15</a>&#46; The activated cells also produce ROS&#44; resulting in severe cell damage and the development of GVHD <a class="elsevierStyleCrossRef" href="#bib16">16</a>&#46; Several studies have shown that GVHD is characterized by increased oxidative stress <a class="elsevierStyleCrossRefs" href="#bib17">17&#8211;19</a>&#44; and it has thus been suggested that antioxidants could be used to prevent GVHD <a class="elsevierStyleCrossRef" href="#bib20">20</a>&#46;</p></span><span id="cesec40" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="cestitle40">Hydrogen as an antioxidant</span><p id="para50" class="elsevierStylePara elsevierViewall">Hydrogen is an inert gas that was long considered to have no effect on higher living organisms&#46; Interestingly&#44; however&#44; in 2007&#44; Ohsawa et al&#46; <a class="elsevierStyleCrossRef" href="#bib21">21</a> observed that hydrogen could reduce the levels of hydroxyl radicals &#40;the most cytotoxic of all ROS&#41;&#44; effectively protecting cells <a class="elsevierStyleCrossRef" href="#bib22">22</a>&#46; Subsequently&#44; many studies showed that hydrogen acts as an antioxidant and it has been used broadly in the prevention and treatment of many illnesses in experimental animal models <a class="elsevierStyleCrossRefs" href="#bib23">23&#8211;28</a>&#46; The hydrogen used in these studies mainly consisted of two types &#40;hydrogen gas and hydrogen-rich saline&#41; delivered through a number of methods&#44; such as ventilation with mixed gas containing hydrogen <a class="elsevierStyleCrossRef" href="#bib29">29</a>&#44; oral administration of hydrogen-rich saline <a class="elsevierStyleCrossRef" href="#bib30">30</a>&#44; intraperitoneal injection of hydrogen gas or hydrogen-rich saline <a class="elsevierStyleCrossRef" href="#bib31">31</a>&#44; and intravenous injection of hydrogen-rich saline <a class="elsevierStyleCrossRef" href="#bib32">32</a>&#46;</p></span><span id="cesec50" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="cestitle50">Hydrogen as a therapeutic modality against transplantation-related I&#47;R injury and GVHD</span><p id="para60" class="elsevierStylePara elsevierViewall">Increasing evidence has shown that molecular hydrogen could play an important role in the prevention and treatment of GVHD and graft I&#47;R injury&#46; Hence&#44; the current literature regarding the effects of hydrogen on different animal models mimicking GVHD and I&#47;R injury will be reviewed&#46; The mechanisms of hydrogen&#39;s effects on I&#47;R injury and GVHD are summarized in <a class="elsevierStyleCrossRef" href="#t1-cln_71p544">Table 1</a>&#44; but although many studies were performed in models of I&#47;R injury&#44; these were not necessarily models of graft I&#47;R injury&#46; Therefore&#44; the results may provide clues about the use of hydrogen for the treatment of graft I&#47;R injury&#44; but caution must be taken when examining these results&#46; The studies mainly examined the use of hydrogen for organ pre-conditioning before harvesting&#44; during organ preservation&#44; and just before or during transplantation&#46; Indeed&#44; prolonged hypothermic preservation prior to transplantation is a challenge in the process of transplantation&#46; In addition&#44; graft I&#47;R injury is common during transplantation&#44; wherein multiple factors are involved and contribute to ROS production and ultrastructural injury&#46; A number of studies have shown that hydrogen can decrease inflammation and apoptosis in graft organs&#44; as detailed below&#46;</p><elsevierMultimedia ident="t1-cln_71p544"></elsevierMultimedia></span><span id="cesec60" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="cestitle60">Heart</span><p id="para70" class="elsevierStylePara elsevierViewall">Nakao et al&#46; <a class="elsevierStyleCrossRef" href="#bib33">33</a> showed that hydrogen could significantly reduce heart I&#47;R injury induced by prolonged hypothermic preservation prior to transplantation through hydrogen&#39;s anti-inflammatory and antioxidant properties&#44; as revealed by decreased levels of malondialdehyde &#40;MDA&#41; &#40;an oxidation marker&#41; and levels of troponin I and creatine phosphokinase &#40;markers of heart injury&#41;&#46; Similarly&#44; Noda et al&#46; <a class="elsevierStyleCrossRef" href="#bib34">34</a> documented that a novel hydrogen-supplemented preservation solution efficiently improved myocardial injury due to cold I&#47;R in a rat heterotopic transplantation model&#46; In this study&#44; the hydrogen-rich preservation solution led to decreased levels of IL-6&#44; IL-1&#946;&#44; TNF-&#945;&#44; ICAM-1&#44; iNOS&#44; and CCL2&#44; which are all markers of inflammation&#46; Another study by Noda et al&#46; showed that drinking hydrogen-rich water after heart transplantation could enhance cardiac allograft survival due to hydrogen&#39;s antioxidant properties&#44; eliminating toxic ROS and reducing chronic intimal hyperplasia of the aortic artery after heart and artery transplantation <a class="elsevierStyleCrossRef" href="#bib35">35</a>&#46; Indeed&#44; this study showed that hydrogen led to increased ATP levels and more efficacious mitochondrial respiratory chain function as well as decreased IL-2 and IFN-&#947; levels and intimal hyperplasia <a class="elsevierStyleCrossRef" href="#bib35">35</a>&#46; Therefore&#44; the use of hydrogen in heart transplantation seems to be associated with reduced oxidative stress and inflammation&#46; However&#44; the available studies on heart grafts are limited in number and scope&#46;</p></span><span id="cesec70" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="cestitle70">Kidneys</span><p id="para80" class="elsevierStylePara elsevierViewall">Hydrogen-rich saline from the University of Wisconsin has been used during hypothermic preservation of renal grafts and has been shown to decrease oxidative stress&#44; as represented by lower MDA and serum 8-hydroxydeoxyguanosine &#40;8-OHdG&#41; levels as well as by prolonged graft survival <a class="elsevierStyleCrossRef" href="#bib36">36</a>&#46; This preservation solution also decreased macrophage infiltration of this type of graft <a class="elsevierStyleCrossRef" href="#bib36">36</a>&#46; In animal models of kidney transplantation&#44; Shingu et al&#46; <a class="elsevierStyleCrossRef" href="#bib37">37</a> showed that treatment with hydrogen-rich saline could significantly attenuate renal graft I&#47;R injury by reducing the levels of 8-OHdG&#44; therefore improving renal transplant function and maintaining normal tissue structure after transplantation&#46; Cardinal et al&#46; <a class="elsevierStyleCrossRef" href="#bib38">38</a> found that oral administration of hydrogen-rich saline could improve kidney function and increase overall survival after allotransplantation through reduction of oxidative stress and limited activation of inflammatory pathways such as MAPK pathways&#46; Taken together&#44; these results suggest that hydrogen improves kidney graft outcomes by decreasing inflammation and oxidative stress&#46;</p></span><span id="cesec80" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="cestitle80">Lungs</span><p id="para90" class="elsevierStylePara elsevierViewall">One study showed that lung inflation with 3&#37; hydrogen during the cold ischemia phase lowered graft myeloperoxidase &#40;MPO&#41; activity and serum IL-8 and TNF-&#945; levels&#44; resulting in alleviated lung graft injury and improved function <a class="elsevierStyleCrossRef" href="#bib39">39</a>&#46; A study by Noda et al&#46; <a class="elsevierStyleCrossRef" href="#bib40">40</a> showed similar results in a rat model of lung transplantation using hydrogen preconditioning during the <span class="elsevierStyleItalic">ex vivo</span> period&#46; The study also showed that the levels of hypoxia-inducible factor-1 were decreased in hydrogen-treated lungs&#44; leading to decreased levels of the inflammatory cytokines IL-6&#44; IL-1&#946;&#44; and TNF-&#945; <a class="elsevierStyleCrossRef" href="#bib40">40</a>&#46; In rat models of brain-dead donor&#47;recipient lung transplantation&#44; it was demonstrated that hydrogen inhalation by the donors and the recipients could improve both lung function and graft histology by decreasing the inflammatory index &#40;higher IL-8 and lower TNF-&#945; levels&#41;&#44; oxidative stress &#40;increased superoxide dismutase &#40;SOD&#41; activity and lower MDA levels&#41;&#44; and apoptosis <a class="elsevierStyleCrossRef" href="#bib41">41</a>&#46; In another rat lung transplantation model&#44; inhalation of mixed gas &#40;98&#37; oxygen and 2&#37; hydrogen&#41; alleviated lung graft I&#47;R injury <a class="elsevierStyleCrossRef" href="#bib42">42</a> by reducing inflammatory mediator upregulation as well as macrophage infiltration and sequestration&#59; lowering tissue MDA levels 2 hours after reperfusion&#59; and increasing the levels of the B-cell lymphoma &#40;Bcl&#41;-2 and Bcl-extra-large proteins&#44; two proteins involved in apoptosis&#46; A study by the same group showed that inhalation of mixed gas &#40;2&#37; hydrogen and 98&#37; oxygen&#41; by the organ donor could reduce the severity of I&#47;R injury by reducing tissue edema and the number of apoptotic pulmonary epithelial cells and especially by increasing the expression of heme oxygenase-1 &#40;HO-1&#41;&#44; which is a potent&#44; inducible transcription factor with antioxidant&#44; anti-inflammatory&#44; and anti-apoptotic properties&#44; therefore playing important roles in lung graft protection <a class="elsevierStyleCrossRef" href="#bib43">43</a>&#46; Additionally&#44; a recent study in pigs showed that hydrogen gas inhalation during <span class="elsevierStyleItalic">ex vivo</span> lung perfusion improved lung function after donation following cardiac death&#59; the hydrogen group also had lower expression of IL-1&#946;&#44; IL-6&#44; IL-8&#44; and TNF-&#945; as well as lower scores for lung injury severity <a class="elsevierStyleCrossRef" href="#bib44">44</a>&#46; Taken together&#44; these studies all suggest that the use of hydrogen in lung grafts reduces inflammation&#44; oxidative stress&#44; and apoptosis&#46;</p></span><span id="cesec90" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="cestitle90">Liver</span><p id="para100" class="elsevierStylePara elsevierViewall">One study examined the outcomes of perfusing the donor liver with hydrogen-saturated lactate Ringer&#39;s solution just before reperfusion and showed significantly lower aspartate aminotransferase and lactate dehydrogenase levels in animals with hydrogen-perfused livers&#44; suggesting better graft function than in untreated grafts <a class="elsevierStyleCrossRef" href="#bib45">45</a>&#46; In a rat model of small intestinal transplantation wherein both donors and recipients received 2&#37; hydrogen inhalation&#44; Buchholz et al&#46; <a class="elsevierStyleCrossRef" href="#bib46">46</a> found that hydrogen treatment significantly decreased the levels of CCL2&#44; IL-1&#946;&#44; IL-6&#44; and TNF-&#945;&#44; leading to improved gastrointestinal transit and decreased lipid peroxidation as well as attenuated post-transplant breakdown of mucosal barrier function&#46; Shigeta et al&#46; <a class="elsevierStyleCrossRef" href="#bib47">47</a> showed that luminal injection of hydrogen-rich solution attenuated I&#47;R injury in a rat model of intestine transplantation by reducing oxidative stress&#46; In a rat model of pancreas transplantation&#44; hydrogen-rich saline was shown to protect against I&#47;R injury&#44; as demonstrated by better histopathological damage scores &#40;based on edema&#44; inflammation and necrosis&#41; and better pancreatic function as well as by reduced levels of TNF-&#945;&#44; IL-1&#946;&#44; and IL-6 <a class="elsevierStyleCrossRef" href="#bib48">48</a>&#46; In a rat model of small-bowel transplantation&#44; rats suffered from symptoms of gastroparesis&#44; and Buchholz et al&#46; <a class="elsevierStyleCrossRef" href="#bib49">49</a> showed that hydrogen could alleviate this transplantation-related gastroparesis by improving the suppression of graft muscle contractility&#44; inhibiting the gene expression of proinflammatory factors&#44; and reducing the systemic inflammatory response&#46;</p></span><span id="cesec100" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="cestitle100">Bone marrow and GVHD</span><p id="para110" class="elsevierStylePara elsevierViewall">Few studies have specifically examined the effects of hydrogen on GVHD&#46; Qian et al&#46; <a class="elsevierStyleCrossRef" href="#bib50">50</a> studied the effects of hydrogen-rich saline treatment in a mouse model of haploidentical allogenic bone marrow transplantation and found that the hydrogen-rich saline group had significantly reduced GVHD&#44; significantly higher survival and faster recovery of peripheral blood leukocytes compared with the control group&#46; This study further expanded the application range of hydrogen and introduced a new method for treating GVHD&#46; However&#44; the study did not examine the exact mechanisms involved in the results and suggested that reduced TNF-&#945;&#44; IL-2&#44; and&#47;or ROS levels may play roles in the benefits of hydrogen against aGVHD after bone marrow transplantation <a class="elsevierStyleCrossRef" href="#bib50">50</a>&#46; In a mouse model consisting of lethal irradiation followed by allogeneic hematopoietic stem cell transplantation&#44; hydrogen-rich saline was shown to improve the survival rate&#44; to lower the rate of GVHD and the serum levels of inflammatory cytokines&#44; and to reduce tissue damage <a class="elsevierStyleCrossRef" href="#bib51">51</a>&#46; Again&#44; the exact mechanisms involved have not been explored&#46;</p></span><span id="cesec110" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="cestitle110">Hydrogen as a treatment for non-graft I&#47;R injury</span><p id="para120" class="elsevierStylePara elsevierViewall">A number of studies have shown that hydrogen could be used to prevent I&#47;R injury&#46; In an experimental model of bilateral renal pedicle occlusion for 45 minutes&#44; Wang et al&#46; <a class="elsevierStyleCrossRef" href="#bib31">31</a> showed that intraperitoneal injection of hydrogen-rich saline five minutes before reperfusion could alleviate I&#47;R injury by inhibiting the secretion of a variety of inflammatory cytokines&#46; In a rat model of I&#47;R injury&#44; inhalation of 2&#46;5&#37; hydrogen initiated 10 minutes before reperfusion and continued for 120 minutes could attenuated renal I&#47;R injury by decreasing MDA levels <a class="elsevierStyleCrossRef" href="#bib52">52</a>&#46; Sun et al&#46; <a class="elsevierStyleCrossRef" href="#bib53">53</a>&#44;<a class="elsevierStyleCrossRef" href="#bib54">54</a> also showed that hydrogen could reduce myocardial damage in a rat heart with regional myocardial I&#47;R through antioxidative and anti-inflammatory effects&#46;</p><p id="para130" class="elsevierStylePara elsevierViewall">In a New Zealand white rabbit model of lung I&#47;R injury&#44; hydrogen-rich saline treatment protected the lung from I&#47;R injury by increasing the PaO<span class="elsevierStyleInf">2</span>&#47;FiO<span class="elsevierStyleInf">2</span> ratio and reducing the lung wet&#47;dry ratio <a class="elsevierStyleCrossRef" href="#bib55">55</a>&#59; in particular&#44; the hydrogen-rich saline group displayed a significantly lower proportion of alveolar hemorrhage and pathologic lesions compared with the control group&#46; In a rat model of lung injury induced by intestinal I&#47;R injury&#44; Mao et al&#46; <a class="elsevierStyleCrossRef" href="#bib56">56</a> showed that hydrogen-rich saline could reduce lung injury by decreasing MDA levels and MPO activity in the lung tissues&#46;</p><p id="para140" class="elsevierStylePara elsevierViewall">In a liver injury mouse model&#44; Sun et al&#46; <a class="elsevierStyleCrossRef" href="#bib57">57</a> showed that hydrogen-rich saline treatment could have protective effects on the liver&#46; Similarly&#44; in a mouse model of liver I&#47;R injury&#44; Fukuda et al&#46; <a class="elsevierStyleCrossRef" href="#bib58">58</a> found that hydrogen inhalation could significantly reduce liver I&#47;R injury by inhibiting the release of serum alanine aminotransferase and MDA production&#46;</p><p id="para150" class="elsevierStylePara elsevierViewall">Spinal cord injuries can be divided into two phases&#58; i&#46;e&#46;&#44; direct mechanical tissue disruption&#44; followed by cell damage by a cascade that includes oxidative stress&#44; calcium mobilization&#44; glutamate toxicity&#44; and inflammation <a class="elsevierStyleCrossRef" href="#bib59">59</a>&#46; Increased ROS production during spinal cord injuries plays a role in neuronal death and subsequent neuronal deficits <a class="elsevierStyleCrossRef" href="#bib60">60</a>&#44;<a class="elsevierStyleCrossRef" href="#bib61">61</a>&#46; In addition to causing direct insults to macromolecules&#44; these ROS act as intracellular messengers of neuronal death <a class="elsevierStyleCrossRef" href="#bib62">62</a>&#44;<a class="elsevierStyleCrossRef" href="#bib63">63</a>&#46; Neurons are among the cells most sensitive to ROS <a class="elsevierStyleCrossRef" href="#bib59">59</a>&#46; It was found that hydrogen reduced acute spinal cord contusion injury by increasing the release of brain-derived neurotrophic factor and decreasing the levels of oxidative products such as 8-iso-prostaglandin F2&#945; and MDA <a class="elsevierStyleCrossRef" href="#bib64">64</a>&#44;<a class="elsevierStyleCrossRef" href="#bib65">65</a>&#46;</p><p id="para160" class="elsevierStylePara elsevierViewall">Retinal I&#47;R injuries are often observed in conditions such as acute angle-closure glaucoma&#44; retinal artery occlusion&#44; and amaurosis fugax&#46; In animal models&#44; retinal I&#47;R injuries are often induced by transient elevation of intraocular pressure&#46; In a model of retinal I&#47;R injury&#44; hydroxyl radicals caused irreversible cellular damage by affecting lipids&#44; proteins and nucleic acids <a class="elsevierStyleCrossRef" href="#bib66">66</a>&#46; Hydrogen-loaded eye drops were used in these animals and markers such as 4-hydroxynonenal and 8-hydroxy-2-deoxyguanosine were used to evaluate I&#47;R injury&#46; The hydrogen-loaded eye drops dramatically decreased 4-hydroxynonenal and 8-hydroxy-2-deoxyguanosine levels and reduced subsequent retinal cell death after I&#47;R injury <a class="elsevierStyleCrossRef" href="#bib66">66</a>&#46;</p><p id="para170" class="elsevierStylePara elsevierViewall">Testicular torsion occurs when the spermatic cord twists&#44; thereby cutting off the testicle&#39;s blood supply&#46; This urological condition usually affects children and adolescents and inflammatory cytokines and free radicals play important roles&#46; One study assessed the effect of hydrogen-rich saline on testicular I&#47;R injury after testicular torsion and showed that the injury score in the hydrogen treatment group was the lowest among all tested groups&#46; Moreover&#44; compared with the other groups&#44; in the hydrogen treatment group&#44; MDA levels were significantly lowered and SOD activity was significantly improved <a class="elsevierStyleCrossRef" href="#bib67">67</a>&#46;</p><p id="para180" class="elsevierStylePara elsevierViewall">In a rat model of <span class="elsevierStyleItalic">in utero</span> I&#47;R injury&#44; Mano et al&#46; <a class="elsevierStyleCrossRef" href="#bib68">68</a> studied the effects of hydrogen on rat fetal hippocampal damage caused by I&#47;R on day 16 of pregnancy&#46; The results indicated that oral administration of hydrogen-saturated water could reduce placental oxidative damage&#44; alleviate neonatal growth retardation and improve the rat fetal hippocampal damage caused by <span class="elsevierStyleItalic">in utero</span> I&#47;R <a class="elsevierStyleCrossRef" href="#bib68">68</a>&#46; Similar effects were observed in another study <a class="elsevierStyleCrossRef" href="#bib69">69</a>&#46;</p><p id="para190" class="elsevierStylePara elsevierViewall">Therefore&#44; a number of animal experiments over the last few years have shown that hydrogen can obviously reduce the damage caused by organ transplantation&#46; From the initial simple effect of antioxidative activity <a class="elsevierStyleCrossRef" href="#bib23">23</a> to anti-inflammatory and anti-apoptotic activity and regulation of signaling pathways <a class="elsevierStyleCrossRef" href="#bib31">31</a>&#44;<a class="elsevierStyleCrossRef" href="#bib54">54</a>&#44;<a class="elsevierStyleCrossRef" href="#bib64">64</a>&#44;<a class="elsevierStyleCrossRef" href="#bib70">70</a>&#44; the effects of hydrogen treatment have been demonstrated in many experiments&#46;</p><p id="para200" class="elsevierStylePara elsevierViewall">A substantial body of experimental evidence suggests that hydrogen can significantly alleviate I&#47;R injury related to transplantation and has a therapeutic effect on complications of transplantation &#40;including GVHD&#41;&#44; mainly <span class="elsevierStyleItalic">via</span> inhibition of inflammatory cytokine secretion and reduction of oxidative stress&#46; However&#44; the exact mechanisms leading to these effects are currently ill known&#46; In addition&#44; many studies on the effects of hydrogen were performed in models of I&#47;R injury&#44; but not in models of graft I&#47;R injury&#46; Nevertheless&#44; the results may provide clues about the use of hydrogen for the treatment of graft I&#47;R injury&#44; although caution must be taken when examining these results&#46;</p><p id="para210" class="elsevierStylePara elsevierViewall">With the advantages of being easily available&#44; having a low price&#44; and being a nontoxic small molecule that is easily absorbed&#44; hydrogen has a strong prospect of clinical applications&#46; Further animal experiments and preliminary human clinical trials are needed to lay the foundation for hydrogen use as a drug in the clinic in the near future&#46;</p></span></span><span id="cesec120" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="cestitle120">AUTHOR CONTRIBUTIONS</span><p id="para220" class="elsevierStylePara elsevierViewall">All authors contributed to the review of the literature&#44; the data analysis&#44; and the manuscript writing and approved the final version of the manuscript&#46;</p></span></span>"
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          "identificador" => "xpalclavsec1580450"
          "titulo" => "KEYWORDS"
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        1 => array:3 [
          "identificador" => "cesec10"
          "titulo" => "INTRODUCTION"
          "secciones" => array:10 [
            0 => array:2 [
              "identificador" => "cesec20"
              "titulo" => "Graft ischemia-reperfusion injury"
            ]
            1 => array:2 [
              "identificador" => "cesec30"
              "titulo" => "Graft-versus-host disease"
            ]
            2 => array:2 [
              "identificador" => "cesec40"
              "titulo" => "Hydrogen as an antioxidant"
            ]
            3 => array:2 [
              "identificador" => "cesec50"
              "titulo" => "Hydrogen as a therapeutic modality against transplantation-related I&#47;R injury and GVHD"
            ]
            4 => array:2 [
              "identificador" => "cesec60"
              "titulo" => "Heart"
            ]
            5 => array:2 [
              "identificador" => "cesec70"
              "titulo" => "Kidneys"
            ]
            6 => array:2 [
              "identificador" => "cesec80"
              "titulo" => "Lungs"
            ]
            7 => array:2 [
              "identificador" => "cesec90"
              "titulo" => "Liver"
            ]
            8 => array:2 [
              "identificador" => "cesec100"
              "titulo" => "Bone marrow and GVHD"
            ]
            9 => array:2 [
              "identificador" => "cesec110"
              "titulo" => "Hydrogen as a treatment for non-graft I&#47;R injury"
            ]
          ]
        ]
        2 => array:2 [
          "identificador" => "cesec120"
          "titulo" => "AUTHOR CONTRIBUTIONS"
        ]
        3 => array:1 [
          "titulo" => "REFERENCES"
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    "pdfFichero" => "main.pdf"
    "tienePdf" => true
    "fechaRecibido" => "2016-04-29"
    "fechaAceptado" => "2016-06-02"
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        0 => array:4 [
          "clase" => "keyword"
          "titulo" => "KEYWORDS"
          "identificador" => "xpalclavsec1580450"
          "palabras" => array:5 [
            0 => "Molecular Hydrogen"
            1 => "Organ Transplantation"
            2 => "Graft-<span class="elsevierStyleItalic">Versus</span>-Host Disease"
            3 => "Ischemia-Reperfusion Injury"
            4 => "Antioxidant"
          ]
        ]
      ]
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        "resumen" => "<span id="ceabs10" class="elsevierStyleSection elsevierViewall"><p id="spara20" class="elsevierStyleSimplePara elsevierViewall">Post-transplant complications such as graft-<span class="elsevierStyleItalic">versus</span>-host disease and graft ischemia-reperfusion injury are crucial challenges in transplantation&#46; Hydrogen can act as a potential antioxidant&#44; playing a preventive role against post-transplant complications in animal models of multiple organ transplantation&#46; Herein&#44; the authors review the current literature regarding the effects of hydrogen on graft ischemia-reperfusion injury and graft-<span class="elsevierStyleItalic">versus</span>-host disease&#46; Existing data on the effects of hydrogen on ischemia-reperfusion injury related to organ transplantation are specifically reviewed and coupled with further suggestions for future work&#46; The reviewed studies showed that hydrogen &#40;inhaled or dissolved in saline&#41; improved the outcomes of organ transplantation by decreasing oxidative stress and inflammation at both the transplanted organ and the systemic levels&#46; In conclusion&#44; a substantial body of experimental evidence suggests that hydrogen can significantly alleviate transplantation-related ischemia-reperfusion injury and have a therapeutic effect on graft-<span class="elsevierStyleItalic">versus</span>-host disease&#44; mainly via inhibition of inflammatory cytokine secretion and reduction of oxidative stress through several underlying mechanisms&#46; Further animal experiments and preliminary human clinical trials will lay the foundation for hydrogen use as a drug in the clinic&#46;</p></span>"
      ]
    ]
    "NotaPie" => array:1 [
      0 => array:1 [
        "nota" => "<p class="elsevierStyleNotepara" id="cenpara10">No potential conflict of interest was reported&#46;</p>"
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                  \t\t\t\t" scope="col">Effects&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t  " align="left" valign="\n
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                  \t\t\t\t" scope="col">Mechanism&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t"><span class="elsevierStyleBold">Antioxidation</span></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">&#42;Inhibition of increased myeloperoxidase &#40;MPO&#41; activity <a class="elsevierStyleCrossRef" href="#bib56">56</a>&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n
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                  \t\t\t\t  " align="left" valign="\n
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                  \t\t\t\t">&#42;Elimination of toxic reactive oxygen species <a class="elsevierStyleCrossRef" href="#bib35">35</a>&#44;<a class="elsevierStyleCrossRef" href="#bib46">46</a>&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n
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                  \t\t\t\t  " align="left" valign="\n
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                  \t\t\t\t">&#42;Decreased levels of 8-hydroxydeoxyguanosine <a class="elsevierStyleCrossRef" href="#bib36">36</a>&#44;<a class="elsevierStyleCrossRef" href="#bib37">37</a>&#44;<a class="elsevierStyleCrossRef" href="#bib66">66</a>&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t\ttop\n
                  \t\t\t\t">&#42;Decreased tissue malondialdehyde levels <a class="elsevierStyleCrossRef" href="#bib36">36</a>&#44;<a class="elsevierStyleCrossRef" href="#bib42">42</a>&#44;<a class="elsevierStyleCrossRef" href="#bib52">52</a>&#44;<a class="elsevierStyleCrossRef" href="#bib56">56</a>&#44;<a class="elsevierStyleCrossRef" href="#bib64">64</a>&#44;<a class="elsevierStyleCrossRef" href="#bib65">65</a>&#44;<a class="elsevierStyleCrossRef" href="#bib67">67</a>&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n
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                  \t\t\t\t  " align="left" valign="\n
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                  \t\t\t\t">&#42;Decreased lipid peroxidation <a class="elsevierStyleCrossRef" href="#bib42">42</a>&#44;<a class="elsevierStyleCrossRef" href="#bib49">49</a>&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n
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                  \t\t\t\t  " align="left" valign="\n
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                  \t\t\t\t">&#42;Increased expression of heme oxygenase-1 <a class="elsevierStyleCrossRef" href="#bib43">43</a>&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">&#42;Decreased MPO activity <a class="elsevierStyleCrossRef" href="#bib56">56</a>&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n
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                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&#42;Decreased levels of 8-iso-prostaglandin F2&#945; <a class="elsevierStyleCrossRef" href="#bib64">64</a>&#44;<a class="elsevierStyleCrossRef" href="#bib65">65</a>&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n
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                  \t\t\t\t  " align="left" valign="\n
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                  \t\t\t\t">&#42;Decreased levels of 4-hydroxynonenal <a class="elsevierStyleCrossRef" href="#bib66">66</a>&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n
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                  \t\t\t\t  " align="left" valign="\n
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                  \t\t\t\t">&#42;Improved superoxide dismutase activity <a class="elsevierStyleCrossRef" href="#bib67">67</a>&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n
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                  \t\t\t\t">&#42;Decreased hypoxia-inducible factor-1 levels <a class="elsevierStyleCrossRef" href="#bib40">40</a>&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t"><span class="elsevierStyleBold">Anti-inflammation</span></td><td class="td" title="\n
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                  \t\t\t\t  " align="left" valign="\n
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                  \t\t\t\t">&#42;Inhibition of the secretion of a variety of inflammatory cytokines <a class="elsevierStyleCrossRef" href="#bib31">31</a>&#44;<a class="elsevierStyleCrossRef" href="#bib42">42</a>&#44;<a class="elsevierStyleCrossRef" href="#bib46">46</a>&#44;<a class="elsevierStyleCrossRef" href="#bib56">56</a>&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t">&#42;Decreased inflammatory index and oxidative stress <a class="elsevierStyleCrossRef" href="#bib41">41</a>&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t">&#42;Reduced macrophage infiltration and sequestration <a class="elsevierStyleCrossRef" href="#bib42">42</a>&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t">&#42;Reduced recruitment of neutrophils <a class="elsevierStyleCrossRef" href="#bib46">46</a>&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t">&#42;Inhibition of the gene expression of proinflammatory factors <a class="elsevierStyleCrossRef" href="#bib49">49</a>&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t">&#42;Increased levels of the B-cell lymphoma-2 and Bcl-extra-large proteins <a class="elsevierStyleCrossRef" href="#bib42">42</a>&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t">&#42;Increased release of brain-derived neurotrophic factor <a class="elsevierStyleCrossRef" href="#bib64">64&#44;65</a>&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t">&#42;Regulation of signaling pathways <a class="elsevierStyleCrossRef" href="#bib54">54&#44;64&#44;70&#44;71</a>&nbsp;\t\t\t\t\t\t\n
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Article information
ISSN: 18075932
Original language: English
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es en pt

¿Es usted profesional sanitario apto para prescribir o dispensar medicamentos?

Are you a health professional able to prescribe or dispense drugs?

Você é um profissional de saúde habilitado a prescrever ou dispensar medicamentos