Variable clinical expression in patients with a germline MEN1 disease gene mutation: clues to a genotype–phenotype correlation

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The observed haplotype in the HSCR/MTC patients (red) contains the region previously recognized as related to the sporadic and familial forms of HSCR (<a class="elsevierStyleCrossRef" href="#bib1">1</a>),(<a class="elsevierStyleCrossRef" href="#bib2">2</a>). Four SNPs within this region are only homozygous (aa) in patients with HSCR." ] ] ] "autores" => array:1 [ 0 => array:2 [ "autoresLista" => "Elisangela P.S. Quedas, Viviane C. Longuini, Tomoko Sekiya, Flavia L. Coutinho, Sergio P.A. Toledo, Uenis Tannuri, Rodrigo A. Toledo" "autores" => array:7 [ 0 => array:2 [ "nombre" => "Elisangela P.S." "apellidos" => "Quedas" ] 1 => array:2 [ "nombre" => "Viviane C." "apellidos" => "Longuini" ] 2 => array:2 [ "nombre" => "Tomoko" "apellidos" => "Sekiya" ] 3 => array:2 [ "nombre" => "Flavia L." "apellidos" => "Coutinho" ] 4 => array:2 [ "nombre" => "Sergio P.A." "apellidos" => "Toledo" ] 5 => array:2 [ "nombre" => "Uenis" "apellidos" => "Tannuri" ] 6 => array:2 [ "nombre" => "Rodrigo A." "apellidos" => "Toledo" ] ] ] ] ] "idiomaDefecto" => "en" "EPUB" => "https://multimedia.elsevier.es/PublicationsMultimediaV1/item/epub/S1807593222023973?idApp=UINPBA00004N" "url" => "/18075932/00000067000000S1/v1_202212010649/S1807593222023973/v1_202212010649/en/main.assets" ] "itemAnterior" => array:19 [ "pii" => "S180759322202395X" "issn" => "18075932" "doi" => "10.6061/clinics/2012(Sup01)09" "estado" => "S300" "fechaPublicacion" => "2012-04-01" "aid" => "2395" "copyright" => "CLINICS" "documento" => "article" "crossmark" => 0 "licencia" => "https://creativecommons.org/licenses/by-nc/3.0/" "subdocumento" => "rev" "cita" => "Clinics. 2012;67 Supl 1:43-8" "abierto" => array:3 [ "ES" => true "ES2" => true "LATM" => true ] "gratuito" => true "lecturas" => array:1 [ "total" => 0 ] "en" => array:11 [ "idiomaDefecto" => true "cabecera" => "REVIEW" "titulo" => "Pituitary tumors in patients with MEN1 syndrome" "tienePdf" => "en" "tieneTextoCompleto" => "en" "tieneResumen" => "en" "paginas" => array:1 [ 0 => array:2 [ "paginaInicial" => "43" "paginaFinal" => "48" ] ] "contieneResumen" => array:1 [ "en" => true ] "contieneTextoCompleto" => array:1 [ "en" => true ] "contienePdf" => array:1 [ "en" => true ] "autores" => array:1 [ 0 => array:2 [ "autoresLista" => "Luis V. Syro, Bernd W. Scheithauer, Kalman Kovacs, Rodrigo A. Toledo, Francisco J. Londoño, Leon D. Ortiz, Fabio Rotondo, Eva Horvath, Humberto Uribe" "autores" => array:9 [ 0 => array:2 [ "nombre" => "Luis V." "apellidos" => "Syro" ] 1 => array:3 [ "nombre" => "Bernd W." "apellidos" => "Scheithauer" "sufijo" => "(in memoriam)" ] 2 => array:2 [ "nombre" => "Kalman" "apellidos" => "Kovacs" ] 3 => array:2 [ "nombre" => "Rodrigo A." "apellidos" => "Toledo" ] 4 => array:2 [ "nombre" => "Francisco J." "apellidos" => "Londoño" ] 5 => array:2 [ "nombre" => "Leon D." "apellidos" => "Ortiz" ] 6 => array:2 [ "nombre" => "Fabio" "apellidos" => "Rotondo" ] 7 => array:2 [ "nombre" => "Eva" "apellidos" => "Horvath" ] 8 => array:2 [ "nombre" => "Humberto" "apellidos" => "Uribe" ] ] ] ] ] "idiomaDefecto" => "en" "EPUB" => "https://multimedia.elsevier.es/PublicationsMultimediaV1/item/epub/S180759322202395X?idApp=UINPBA00004N" "url" => "/18075932/00000067000000S1/v1_202212010649/S180759322202395X/v1_202212010649/en/main.assets" ] "en" => array:17 [ "idiomaDefecto" => true "cabecera" => "REVIEW" "titulo" => "Variable clinical expression in patients with a germline MEN1 disease gene mutation: clues to a genotype–phenotype correlation" "tieneTextoCompleto" => true "paginas" => array:1 [ 0 => array:2 [ "paginaInicial" => "49" "paginaFinal" => "56" ] ] "autores" => array:1 [ 0 => array:4 [ "autoresLista" => "Cornelis J. Lips, Koen M. Dreijerink, Jo W. Höppener" "autores" => array:3 [ 0 => array:4 [ "nombre" => "Cornelis J." "apellidos" => "Lips" "email" => array:1 [ 0 => "lips05@zonnet.nl" ] "referencia" => array:2 [ 0 => array:2 [ "etiqueta" => "I" "identificador" => "aff1" ] 1 => array:2 [ "etiqueta" => "*" "identificador" => "cor1" ] ] ] 1 => array:3 [ "nombre" => "Koen M." "apellidos" => "Dreijerink" "referencia" => array:1 [ 0 => array:2 [ "etiqueta" => "I" "identificador" => "aff1" ] ] ] 2 => array:3 [ "nombre" => "Jo W." "apellidos" => "Höppener" "referencia" => array:1 [ 0 => array:2 [ "etiqueta" => "II" "identificador" => "aff2" ] ] ] ] "afiliaciones" => array:2 [ 0 => array:3 [ "entidad" => "University Medical Center Utrecht, Department of Internal Medicine & Endocrinology, Utrecht, The Netherlands." "etiqueta" => "I" "identificador" => "aff1" ] 1 => array:3 [ "entidad" => "University Medical Center Utrecht, Department of Metabolic & Endocrine Diseases, Utrecht, The Netherlands." "etiqueta" => "II" "identificador" => "aff2" ] ] "correspondencia" => array:1 [ 0 => array:3 [ "identificador" => "cor1" "etiqueta" => "*" "correspondencia" => "Tel.: +31 703240428" ] ] ] ] "resumenGrafico" => array:2 [ "original" => 0 "multimedia" => array:7 [ "identificador" => "fig2" "etiqueta" => "Figure 2" "tipo" => "MULTIMEDIAFIGURA" "mostrarFloat" => true "mostrarDisplay" => false "figura" => array:1 [ 0 => array:4 [ "imagen" => "gr2.jpeg" "Alto" => 549 "Ancho" => 662 "Tamanyo" => 38911 ] ] "descripcion" => array:1 [ "en" => "Beyond inactivation of the MEN1 gene, additional mutations in other genes may be responsible for acceleration of tumor growth, thus involving a process of multistep tumorigenesis. Deregulation of normal neuroendocrine development/differentiation can occur through a range of processes, e.g. activation of the PI3K pathway leads to AKT phosphorylation, triggering a downstream cascade of events. Deregulation of this pathway can occur through several mechanisms: 1) gain of function by oncogenic mutations of PIK3; 2) loss of function of the tumor suppressor PTEN through gene deletion, mutation, micro-RNA expression, or epigenetic silencing; 3) amplification or mutation of AKT isoforms; 4) upstream activation through RTK signalling; 5) downstream loss of the tumor suppressors p18 and p27; 6) increased RAS expression, or activating mutations of RAF, MEK, or ERK, which accelerate cell proliferation. Opportunities for treatment are in blue. NSAIDs = non-steroidal anti-inflammatory drugs; RTK = receptor tyrosine kinase; TZDs = thiazolidinediones." ] ] ] "textoCompleto" => "INTRODUCTION„It is an old experience that through her errors, Nature often grants us unexpected insights into her secrets which are otherwise a closed domain“, William Harvey, 1657.Multiple endocrine neoplasia type 1 (MEN1) is an inherited endocrine tumor syndrome, characterized predominantly by tumors of the parathyroid glands, gastroenteropancreatic tumors, pituitary adenomas, adrenal adenomas, and neuroendocrine tumors of the thymus, lungs or stomach. MEN1 is caused by germline mutations of the MEN1 tumor suppressor gene. It appears that in the MEN1 syndrome, clinical expression differs between families. This may be the result of the specific MEN1 gene mutation in a family (genotype–phenotype correlation). As a rule, the development of a tumor depends on a series of genetic events (multistep tumorigenesis). Thus, additional co-segregating modifying factors such as germline mutations in other genes are likely to play a role in the interfamilial variability of MEN 1. Moreover, clinical expression can also vary between individual members of the same family, possibly because of additional genetic or epigenetic factors. To date, a clear correlation between genetic events and the variable clinical expression of MEN1 has not been established (<a class="elsevierStyleCrossRefs" href="#bib1">1–5</a>). Further understanding of the genetic aspects of MEN1 and the pathogenesis of MEN1-related tumors could enable more tailored clinical screening and treatment strategies.In this review, we discuss recent reports on aberrant clinical expression of MEN1, which may allow us a glimpse into the pathogenesis of this intriguing disorder.In 1903, Erdheim described the case of an acromegalic patient with a pituitary adenoma and three enlarged parathyroid glands. Fifty years later, Underdahl et al. reported eight patients with a syndrome of pituitary-, parathyroid-, and pancreatic islet adenomas. In 1954, Wermer found that the syndrome was transmitted as a dominant trait (<a class="elsevierStyleCrossRef" href="#bib6">6</a>). In 1968, Steiner et al. introduced the term “multiple endocrine neoplasia” (MEN) to describe disorders featuring combinations of endocrine tumors; they designated the Wermer syndrome as MEN1 and the Sipple syndrome as MEN2. Gorlin subdivided type 2 into A and B. Then, in 1975, Khairi (<a class="elsevierStyleCrossRef" href="#bib7">7</a>) suggested that type 2B be called type 3; however, this was not generally accepted. More recently, in 2006, families with multiple endocrine tumors but without MEN1 or RET (MEN2) gene mutations were identified (<a class="elsevierStyleCrossRef" href="#bib8">8</a>). This related syndrome is referred to as MEN4.DISCOVERY OF THE MEN1 GENEIn positional cloning, gene mapping precedes, and eventually leads to, gene identification. The first step is mapping the gene to a specific chromosomal region by linkage analysis. The second step is identifying the correct gene among all possible candidate genes within that particular chromosomal region. After the gene has been identified, it is possible to study its (patho)physiologic function.In 1996, two groups independently identified the MEN1 gene on chromosome 11q13 (<a class="elsevierStyleCrossRef" href="#bib9">9</a>),(<a class="elsevierStyleCrossRef" href="#bib10">10</a>). To date, more than 1336 different MEN1 gene mutations (both germline and sporadic) have been reported in the literature (<a class="elsevierStyleCrossRef" href="#bib4">4</a>). Most of these mutations are clearly inactivating, in accordance with the notion that the MEN1 gene is a tumor suppressor gene. There are no mutational hot spots in the MEN1 gene.FUNCTION OF THE MEN1-GENE PRODUCTThe MEN1 gene product, menin, functions as an adaptor protein that is involved in interactions with multiple protein partners. Men1 null mutant mice have indicated that menin is essential for viability (<a class="elsevierStyleCrossRef" href="#bib11">11</a>). Menin is involved in neuroendocrine cell development and function. Later on, it is active in many cellular processes, including gene transcription regulation, DNA replication, DNA repair, and signal transduction.Menin target genes that are important for development and proliferation, including homeobox domain (HOX) genes, the CDKN2C and CDKN1B cyclin-dependent kinase inhibiting genes, the human telomerase (hTERT) gene, and nuclear receptor target genes (<a class="elsevierStyleCrossRefs" href="#bib12">12–15</a>).As a transcriptional co-regulator, menin may function as a co-activator or co-repressor by recruiting histone-modifying enzymatic activity (<a class="elsevierStyleCrossRef" href="#bib12">12</a>),(<a class="elsevierStyleCrossRef" href="#bib15">15</a>),(<a class="elsevierStyleCrossRef" href="#bib16">16</a>). As a co-activator, menin is involved in the regulation of histone methylation by recruiting the mixed-lineage leukaemia (MLL) proteins MLL1 and MLL2 (<a class="elsevierStyleCrossRef" href="#bib12">12</a>),(<a class="elsevierStyleCrossRef" href="#bib17">17</a>). In this way, menin can bind to nuclear receptors and activate nuclear receptor-mediated gene transcription (<a class="elsevierStyleCrossRef" href="#bib12">12</a>),(<a class="elsevierStyleCrossRef" href="#bib15">15</a>). By tethering histone deacetylase activity to genes, menin can serve as a repressor of transcription (<a class="elsevierStyleCrossRef" href="#bib18">18</a>).In order to understand the role of menin as a tumor suppressor protein and as a co-factor of MLL fusion proteins, the structural basis had to be revealed. Recently, the crystal structure of menin in Nematostella vectensis was reported (<a class="elsevierStyleCrossRef" href="#bib19">19</a>). Knowledge about the three-dimensional structure may elucidate the interactions essential to the function of menin. It appears that the Leucine, Leucine, Tryptophan, Leucine, Leucine (LLWLL) amino acids nuclear receptor interaction motif of menin is well-conserved and is located in an alpha-helix. In general, modeling gene mutations into this structure will be helpful in determining the effects on protein function. Inactivation of the MEN1 gene results in predisposition to tumor formation (see <a class="elsevierStyleCrossRef" href="#fig1">Figure 1</a>), <a class="elsevierStyleCrossRef" href="#tbl1">Table 1</a>.<elsevierMultimedia ident="fig1"></elsevierMultimedia><elsevierMultimedia ident="tbl1"></elsevierMultimedia>ABERRANT CLINICAL EXPRESSION OF MEN1A MEN1 gene mutation may be completely detrimental to gene function. It may also result in a protein product with some residual function. An aberrant menin protein may be impaired in its function by several mechanisms: menin can interact with many different proteins. Possibly, germline mutations in the MEN1 gene selectively affect menin binding to its partners, leading to distinct phenotypes.The type of missense mutation (e.g. replacement of arginine with glycine) may have a differential effect on the function of menin (<a class="elsevierStyleCrossRef" href="#bib38">38</a>): in-frame or missense mutations differ from frameshift/nonsense mutations (<a class="elsevierStyleCrossRef" href="#bib39">39</a>), whereas missense and in-frame mutations may affect the interactions of a menin domain with transcription factors such as JunD, Smad3 and NFkappaB and nuclear receptors (<a class="elsevierStyleCrossRef" href="#bib1">1</a>), or impair sensitization to apoptosis from caspase-3, p53 or p21 (<a class="elsevierStyleCrossRef" href="#bib40">40</a>). A MEN1 gene missense mutation may result in protein instability, and enhanced and early proteolytic degradation via the ubiquitin–proteasome pathway (<a class="elsevierStyleCrossRef" href="#bib41">41</a>).It was generally assumed that, in contrast to MEN2, in MEN1 there is no clear genotype–phenotype correlation (<a class="elsevierStyleCrossRef" href="#bib1">1</a>),(<a class="elsevierStyleCrossRefs" href="#bib3">3–5</a>). However, several reports challenge this assumption.Familial aberrant expression1. MEN1 BurinFour large kindreds from the Burin peninsula/Fortune Bay area of Newfoundland with prominent features of prolactinomas, in addition to carcinoids, and parathyroid tumors (referred to as MEN1Burin) have been described, and they show linkage to 11q13, the same locus as that of MEN1. Haplotype analysis with 16 polymorphic markers now reveals that representative affected individuals from all four families share a common haplotype over a 2.5 Mb region. A nonsense mutation in the MEN1 gene has been found to be responsible for the disease in the affected members in all four of the MEN1-Burin families. This suggests that either a common ancestral mutation in the MEN1-Burin gene or a modifying gene on 11q13 is responsible for this prolactinoma variant of MEN1 (<a class="elsevierStyleCrossRefs" href="#bib42">42–45</a>).2. Familiar isolated hyperparathyroidism and MEN1 gene missense mutationsFamilial isolated primary hyperparathyroidism (FIHP) is an autosomal dominant disorder that can represent an early stage of either MEN1 caused by an allelic variant of the MEN1 gene, or of hyperparathyroidism–jaw tumor (HPT-JT) syndromes; alternatively, the condition can be caused by an allelic variant of the hyperparathyroidism 2 (HRPT2) gene, or caused by a mutation at another locus. Interestingly, the major proportion of MEN1 gene germline mutations that have been found in FIHP are seemingly mild missense mutations or in-frame deletions (<a class="elsevierStyleCrossRefs" href="#bib46">46–55</a>). In MEN1, roughly 80% of patients harbor nonsense mutations.3. Predominant mutations in MEN1 pancreatic neuroendocrine tumorsSchaaf performed mutation analysis of the MEN1 gene in tumors from 306 patients with MEN1, and found that patients with gastroenteropancreatic tumors more often had truncating mutations, very probably leading to completely inactivated menin (<a class="elsevierStyleCrossRef" href="#bib56">56</a>).4. Mild/late onset versus malignant phenotypesTo date, several disease-related MEN1 gene intron mutations have been reported. These intron mutations may affect mRNA splicing and cause mild phenotypes, with late, and relatively low, penetrance of the disease (<a class="elsevierStyleCrossRefs" href="#bib57">57–59</a>). However, clinical expression at a young age may occur. This may be explained by interpatient variations in gene transcription and translation of the MEN1 gene.Two recent case reports described families with a high penetrance of malignant neuroendocrine tumors of the pancreas (<a class="elsevierStyleCrossRef" href="#bib60">60</a>),(<a class="elsevierStyleCrossRef" href="#bib61">61</a>). Both these families carried germline mutations that completely abolish menin function.The earliest manifestation of MEN1 was a pituitary adenoma in a 5-year-old boy who had a missense mutation leading to a H139D substitution in the MEN1 protein (<a class="elsevierStyleCrossRef" href="#bib62">62</a>). Functional analysis of the mutant protein revealed severely reduced protein stability (<a class="elsevierStyleCrossRef" href="#bib41">41</a>), reduced binding to JunD (<a class="elsevierStyleCrossRef" href="#bib16">16</a>), reduced binding to the estrogen receptor alpha and absent histone-methylation recruiting capacity. Thus, functional analysis of this potentially mild missense MEN1 gene mutation shows that the protein product is, in fact, completely inactivated.5. Metabolic effects of aberrant expression of the MEN1 geneIn MEN1 disease-gene carriers, all vitamin D receptors (VDRs) and peroxisome proliferator-activated receptors (PPARs)-γ are expressed but are probably less activated because of impaired menin function.A. PPARγ2 is a transcription factor that plays a key role in adipocyte differentiation. Polymorphisms in this gene may contribute to the variability in body mass index and insulin sensitivity in the general population. PPARγ is the receptor for the thiazolidinediones, which act as PPARγ agonists and lower the blood glucose levels in patients with type 2 diabetes mellitus by increasing insulin sensitivity. Individuals with dominant-negative PPARγ gene mutations manifest a syndrome that combines lipodystrophy with features of the metabolic syndrome, including insulin resistance, type 2 diabetes, hepatic steatosis, dyslipidemia, hypertension and (in women) polycystic ovary syndrome. In patients with MEN1, decreased activation of PPAR may result in insulin resistance and weight gain (<a class="elsevierStyleCrossRef" href="#bib63">63</a>).B. Vitamin D receptors (VDRs) are found in a large number of tissues beyond the classic target tissues gut, bone and kidney. These tissues include endocrine glands such as pituitary, parathyroid glands, pancreatic islets, etc.Lourenço et al. discussed the increased bone loss pattern found in patients with MEN1 compared with that of patients with sporadic primary HPT (<a class="elsevierStyleCrossRef" href="#bib64">64</a>). Besides increased bone loss, resistance to vitamin D may be associated with insulin resistance and beta cell dysfunction, leading to increased risk for type 2 diabetes in patients with MEN1 (<a class="elsevierStyleCrossRef" href="#bib65">65</a>),(<a class="elsevierStyleCrossRef" href="#bib66">66</a>).Effect of genderThe prevalence and probability of pancreatic tumors among patients with MEN1 were higher in males than in females. This difference was due to the differential occurrence of gastrinomas. The prevalence and probability of developing pituitary adenomas were significantly greater in females. Thymic tumors are found nearly exclusively in male MEN1 patients (<a class="elsevierStyleCrossRef" href="#bib67">67</a>).The difference in clinical expression between the genders may be explained by the difference in transcription regulation of estrogen and androgen receptors. Menin can act as a co-activator of nuclear hormone receptors including estrogen (ERα) and possibly androgen (AR) receptors. A defect in the MEN1 gene, together with gender-specific differences in concentrations of the hormones involved and tissue-specific distribution of their receptors, may contribute to the observed gender-specific differences in prevalence of prolactinoma and gastrinoma.Additional genetic effects1. Loss of heterozygosity; the AIP geneIn accordance with the tumor suppressor function of menin, MEN1-associated tumors exhibit loss of the wild-type allele. This second hit occurs as a somatic mutation and often involves deletion of a larger chromosomal region containing multiple genes [loss of heterozygosity (LOH)].The gene encoding the aryl hydrocarbon receptor interacting protein (AIP) is located on 11q13, in the vicinity of the MEN1 gene. Recently, it was found that inactivating mutations in the AIP gene are the underlying cause of low-penetrance pituitary adenoma predisposition. The finding of a truncated gene and LOH indicates that AIP acts as a tumor suppressor gene (<a class="elsevierStyleCrossRef" href="#bib68">68</a>),(<a class="elsevierStyleCrossRef" href="#bib69">69</a>). In northern Finland, AIP-germline mutations accounted for 16% of cases of acromegaly in young patients. The tumor suppressor genes AIP and MEN1 are located 3 Mb apart. Concomitant deletions of these genes may underlie predisposition to MEN1 and pituitary adenoma. To what extent deletion of the AIP gene is present in MEN1 tumors has yet to be established. Inactivation of this gene in animal models may reveal a potential causative role in MEN1-associated tumors.2. Genetic predisposition for other diseasesGenetic predisposition for other diseases may contribute to enhancement of tumor formation in patients with MEN1 (<a class="elsevierStyleCrossRef" href="#bib70">70</a>). For instance, normally the vitamin D receptor on parathyroid cells inhibits production and release of parathyroid hormone (PTH). In families with inactivating mutations in the gene encoding VDR, this is associated with end-organ resistance to calcitriol.In the parathyroid glands of patients with MEN1, there exists a decreased activation of the VDR. An additional defect in the VDR or calcium receptor may contribute to hyperactivity, hyperplasia, and adenoma (<a class="elsevierStyleCrossRef" href="#bib71">71</a>).3. Additional, somatic mutations involved in acceleration of tumor growth3a). Data from other familial neuroendocrine tumor syndromesHow can we identify acquired mutations that are responsible for acceleration of tumor growth in MEN1? Clues for modifier genes may be found in other familial neuroendocrine tumor syndromes such as MEN2 and MEN4 (the latter is also referred to as MENX). Which are their traditional pathogenetic pathways and are these involved in aberrant clinical MEN1 expression? Overlap between MEN1 and MEN2 and additional genetic events have to be explored (e.g. p18/p27 knock-out mice develop both MEN1- and MEN2-associated tumors) (<a class="elsevierStyleCrossRef" href="#bib72">72</a>),(<a class="elsevierStyleCrossRef" href="#bib73">73</a>).Phenotypic overlap between MEN1- and MEN2-like syndromes was identified in the rat and named MENX. The syndrome is caused by a germline inactivating mutation in the CDKN1B gene encoding p27Kip1 (<a class="elsevierStyleCrossRef" href="#bib8">8</a>). p27Kip1 has a key role in cell cycle regulation and is involved in differentiation, apoptosis, and angiogenesis.Subsequently, germline mutations in the CDKN1B gene were identified in the germline of a MEN1-like family. In these patients, germline mutations of the MEN1 gene could not be detected (<a class="elsevierStyleCrossRef" href="#bib8">8</a>). However, only the menin-coding region and splice junctions were analyzed. The patients were also negative for RET gene mutations (MEN2). Mutations in CDKN1B and related genes, but without MEN1 gene mutations, are a rare cause of MEN1-like phenotype (<a class="elsevierStyleCrossRefs" href="#bib74">74–76</a>). As a consequence of mutations in the p27 gene, a novel human MEN syndrome was recognized and named MEN4.In mice, the Cdkn2c gene encoding p18Ink4c was shown to collaborate with menin in suppression of neuroendocrine tumor development (<a class="elsevierStyleCrossRef" href="#bib77">77</a>). Whether occurrence of somatic mutations in p18Ink4c and/or p27Kip1 accelerates tumor growth in human MEN1 tumors has yet to be established. In transgenic MEN2 mice and human patients with MEN2, inactivating mutations in p18 will promote tumor growth (<a class="elsevierStyleCrossRef" href="#bib72">72</a>),(<a class="elsevierStyleCrossRef" href="#bib73">73</a>),(<a class="elsevierStyleCrossRef" href="#bib78">78</a>),(<a class="elsevierStyleCrossRef" href="#bib79">79</a>). Reduced expression of CDKN1B, but not CDKN2C, has been observed in parathyroid adenomas from patients with MEN1.3b). Clues from sporadic parathyroid adenomas, pituitary tumors, and pancreatic NETsi) Sporadic Parathyroid adenomaA high rate of somatic MEN1 gene mutations is seen in sporadic parathyroid adenomas. There exists an interaction between menin and the transforming growth factor (TGF)-beta/Smad signaling pathway. In vitro experimentation has demonstrated that the presence of menin is required for TGF-beta to effectively inhibit parathyroid cell proliferation and PTH production (<a class="elsevierStyleCrossRef" href="#bib80">80</a>).ii) Pituitary tumorsThe pituitary tumor transforming gene (PTTG; securin) was the first transforming gene found to be highly expressed in pituitary tumor cells, and seems to play an important role in the process of oncogenesis. Cell signaling abnormalities have been identified in pituitary tumors, but their genetic basis is unknown. Both Raf/mitogen activated protein kinase kinase (MEK)/extracellular signal-regulated kinase (ERK) and phosphoinositide 3-kinase(PI3K)/Akt/mammalian target of rapamycin (mTOR) pathways are over-expressed and/or over-activated in pituitary tumors (<a class="elsevierStyleCrossRef" href="#bib81">81</a>). These pathways share a common root, including initial activation by a tyrosine kinase receptor.Pit-1 is a direct transcriptional target of VDR. Recruitment of histone deacetylase 1 is involved in the repressive effect of VDR on Pit-1 expression (<a class="elsevierStyleCrossRef" href="#bib82">82</a>).There is a critical role for the growth factor activin in regulating inhibition of pituitary cell growth and Pit-1/PRL expression through the Smads and menin (<a class="elsevierStyleCrossRef" href="#bib83">83</a>). Alterations in the activin/TGF-beta downstream signaling pathways may be critical steps towards tumor formation and progression (<a class="elsevierStyleCrossRef" href="#bib84">84</a>). To date, the occurrence of additional TGF-beta, Pit-1, PTTG, or VDR mutations in MEN1-associated tumors has not been published.iii) Pancreatic neuroendocrine tumorsIn nonfamilial pancreatic neuroendocrine tumors (PanNETs) the most commonly mutated genes specify proteins implicated in chromatin remodeling: 44% of the tumors had somatic inactivating mutations in MEN1. Clinically, mutations in the MEN1 gene were associated with better prognosis. Also, mutations in genes in the mTOR pathway were found in 14% of the tumors, a finding that could potentially be used to stratify patients for treatment with mTOR inhibitors (<a class="elsevierStyleCrossRef" href="#bib85">85</a>).Loss of menin expression is associated with over-expression of the Raf/MEK/ERK and P13K/AKT/mTOR pathways in pancreatic tumors (<a class="elsevierStyleCrossRef" href="#bib34">34</a>). Intact menin has an essential role in WNT/β-catenin signaling, and inhibits mouse pancreatic islet tumor proliferation (<a class="elsevierStyleCrossRef" href="#bib26">26</a>). Menin regulates subcellular localization of β-catenin via nuclear-cytoplasmic shuttling. Loss of menin leads to Wnt/β-catenin signaling activation. Expression of p27 was found to be repressed in pancreatic islet cell tumors (<a class="elsevierStyleCrossRef" href="#bib86">86</a>).3c) Pathways in multistep carcinogenesisIt appears that interaction of components of the PI3K/AKT pathway is involved in neuroendocrine tumor formation (<a class="elsevierStyleCrossRef" href="#bib87">87</a>),(<a class="elsevierStyleCrossRef" href="#bib88">88</a>). Deregulation of the PI3K/AKT pathway in neuroendocrine tumors can occur through a range of processes (see <a class="elsevierStyleCrossRef" href="#fig2">Figure 2</a>), including gain of function by oncogenic mutations of PI3K signalling, loss of function of the tumor suppressor PTEN through gene deletion, mutation, micro-RNA expression or epigenetic silencing, upstream activation through receptor tyrosine kinase (RTK) signaling, and/or downstream loss of the tumor suppressors p18 and p27.<elsevierMultimedia ident="fig2"></elsevierMultimedia>A combination of a mutation in the MEN1 disease gene with other specific mutations of genes in the PI3K/AKT pathway may be associated with acceleration of tumor growth.In addition, inactivated or absent menin promotes RAS expression; activating mutations of RAF, MEK, or ERK may accelerate cell proliferation (<a class="elsevierStyleCrossRef" href="#bib89">89</a>).Ecogenetic factorsCommon environmental factors may interact with genetic predisposition to MEN1 and contribute to enhancement of tumor formation (<a class="elsevierStyleCrossRef" href="#bib70">70</a>). In the parathyroid glands of patients with MEN1, a diet low in vitamin D or calcium may result in tumor growth. In the lactotropic cells of the pituitary gland, estrogenic or neuroleptic drugs may stimulate cell division. In the gastrin-producing cells of the stomach, presence of achlorhydria or use of histamine-H2 receptor or proton pump blockers may promote tumor growth (<a class="elsevierStyleCrossRef" href="#bib90">90</a>). Lifestyle factors such as smoking and exposure to radiation may have deleterious effects on menin function and tumor growth, as with many types of cancer.CONCLUDING REMARKSCareful observation of patients and collaboration between disciplines, including molecular endocrinology, has opened new directions in the management of MEN1 syndrome, and has promoted development of novel target-directed therapy. Since 1980, life expectancy and quality of life have improved considerably.By contrast, thymic tumors and duodenopancreatic tumors, including nonsecreting pancreatic tumors increase the risk of death (<a class="elsevierStyleCrossRef" href="#bib91">91</a>). Rare, but aggressive, adrenal tumors may also cause early death. In MEN1 disease gene carriers in MEN1 families, most deaths were related to the disease, and probably resulted from additional mutations.It is possible that consecutive and specific pathogenetic pathways are involved in MEN1 tumor formation. We presume that, through the inherited germline mutation resulting in organ-specific cell division, the patient is rendered vulnerable to additional, somatic mutations in these organs. These mutations may occur spontaneously or may be triggered by life style and/or environment. Predisposition and expression of other genetic diseases may also be involved. A complex genotype–phenotype relationship may be present. Unfortunately, for the majority of the patients it is not currently possible to predict the course of the disease.Germline mutations that result in complete inactivation of the gene product apparently cause more severe disease.Consequently, extensive periodical clinical examination has to be performed in all carriers of the MEN1 disease gene. In the near future, tumor gene-expression profiles and high throughput sequencing may permit more insight into additional genetic and epigenetic events that cause progression of tumor development. Functional analysis of MEN1 gene mutations is sometimes required to study the true effect of the mutation. In addition, as already suggested by Sir William Harvey, it is very helpful to investigate rare presentations of diseases (<a class="elsevierStyleCrossRef" href="#bib92">92</a>). Eventually, this insight may allow target-directed and mutation-specific therapy." "textoCompletoSecciones" => array:1 [ "secciones" => array:7 [ 0 => array:2 [ "identificador" => "xpalclavsec1581202" "titulo" => "KEYWORDS" ] 1 => array:2 [ "identificador" => "cesec10" "titulo" => "INTRODUCTION" ] 2 => array:2 [ "identificador" => "cesec20" "titulo" => "DISCOVERY OF THE MEN1 GENE" ] 3 => array:2 [ "identificador" => "cesec30" "titulo" => "FUNCTION OF THE MEN1-GENE PRODUCT" ] 4 => array:3 [ "identificador" => "cesec40" "titulo" => "ABERRANT CLINICAL EXPRESSION OF MEN1" "secciones" => array:4 [ 0 => array:3 [ "identificador" => "cesec50" "titulo" => "Familial aberrant expression" "secciones" => array:5 [ 0 => array:2 [ "identificador" => "cesec60" "titulo" => "1. MEN1 Burin" ] 1 => array:2 [ "identificador" => "cesec70" "titulo" => "2. Familiar isolated hyperparathyroidism and MEN1 gene missense mutations" ] 2 => array:2 [ "identificador" => "cesec80" "titulo" => "3. Predominant mutations in MEN1 pancreatic neuroendocrine tumors" ] 3 => array:2 [ "identificador" => "cesec90" "titulo" => "4. Mild/late onset versus malignant phenotypes" ] 4 => array:2 [ "identificador" => "cesec100" "titulo" => "5. Metabolic effects of aberrant expression of the MEN1 gene" ] ] ] 1 => array:2 [ "identificador" => "cesec110" "titulo" => "Effect of gender" ] 2 => array:3 [ "identificador" => "cesec120" "titulo" => "Additional genetic effects" "secciones" => array:3 [ 0 => array:2 [ "identificador" => "cesec130" "titulo" => "1. Loss of heterozygosity; the AIP gene" ] 1 => array:2 [ "identificador" => "cesec140" "titulo" => "2. Genetic predisposition for other diseases" ] 2 => array:3 [ "identificador" => "cesec150" "titulo" => "3. Additional, somatic mutations involved in acceleration of tumor growth" "secciones" => array:3 [ 0 => array:2 [ "identificador" => "cesec160" "titulo" => "3a). Data from other familial neuroendocrine tumor syndromes" ] 1 => array:3 [ "identificador" => "cesec170" "titulo" => "3b). Clues from sporadic parathyroid adenomas, pituitary tumors, and pancreatic NETs" "secciones" => array:3 [ 0 => array:2 [ "identificador" => "cesec180" "titulo" => "i) Sporadic Parathyroid adenoma" ] 1 => array:2 [ "identificador" => "cesec190" "titulo" => "ii) Pituitary tumors" ] 2 => array:2 [ "identificador" => "cesec200" "titulo" => "iii) Pancreatic neuroendocrine tumors" ] ] ] 2 => array:2 [ "identificador" => "cesec210" "titulo" => "3c) Pathways in multistep carcinogenesis" ] ] ] ] ] 3 => array:2 [ "identificador" => "cesec220" "titulo" => "Ecogenetic factors" ] ] ] 5 => array:2 [ "identificador" => "cesec230" "titulo" => "CONCLUDING REMARKS" ] 6 => array:1 [ "titulo" => "REFERENCES" ] ] ] "pdfFichero" => "main.pdf" "tienePdf" => true "PalabrasClave" => array:1 [ "en" => array:1 [ 0 => array:4 [ "clase" => "keyword" "titulo" => "KEYWORDS" "identificador" => "xpalclavsec1581202" "palabras" => array:5 [ 0 => "Multiple Endocrine Neoplasia type 1" 1 => "MEN1" 2 => "Menin" 3 => "Genotype–Phenotype Correlation" 4 => "Clinical Expression" ] ] ] ] "tieneResumen" => true "resumen" => array:1 [ "en" => array:1 [ "resumen" => "Multiple endocrine neoplasia type 1 is an inherited endocrine tumor syndrome, predominantly characterized by tumors of the parathyroid glands, gastroenteropancreatic tumors, pituitary adenomas, adrenal adenomas, and neuroendocrine tumors of the thymus, lungs or stomach. Multiple endocrine neoplasia type 1 is caused by germline mutations of the multiple endocrine neoplasia type 1 tumor suppressor gene. The initial germline mutation, loss of the wild-type allele, and modifying genetic and possibly epigenetic and environmental events eventually result in multiple endocrine neoplasia type 1 tumors. Our understanding of the function of the multiple endocrine neoplasia type 1 gene product, menin, has increased significantly over the years. However, to date, no clear genotype–phenotype correlation has been established.In this review we discuss reports on exceptional clinical presentations of multiple endocrine neoplasia type 1, which may provide more insight into the pathogenesis of this disorder and offer clues for a possible genotype–phenotype correlation." ] ] "NotaPie" => array:1 [ 0 => array:1 [ "nota" => "No potential conflict of interest was reported. Lips CJ conceived and designed the study and was also responsible for the manuscript writing and preparation of figures and table. Dreijerink KM searched the literature for important contents, provided assistance to the manuscript writing and to the molecular aspects of the menin protein. Höppener JW provided assistance to the study design, manuscript writing and final version of the manuscript." ] ] "multimedia" => array:3 [ 0 => array:7 [ "identificador" => "fig1" "etiqueta" => "Figure 1" "tipo" => "MULTIMEDIAFIGURA" "mostrarFloat" => true "mostrarDisplay" => false "figura" => array:1 [ 0 => array:4 [ "imagen" => "gr1.jpeg" "Alto" => 379 "Ancho" => 661 "Tamanyo" => 38237 ] ] "descripcion" => array:1 [ "en" => "In MEN1 tumors, inactivating mutations in the MEN1 gene result in alterations of histone protein modifications: both deacetylation (left) and trimethylation (right) are repressed. In this way, the normal function of menin acting as co-repressor and co-activator of gene transcription is disabled. Consequently, the normal function of menin (preservation of differentiation of the cell by modification of histone proteins and transcription of genes responsible for inhibition of cell division) is defective. Red arrows indicate inhibition of apoptosis, cell differentiation, DNA repair, and endocrine metabolic functions, whereas stimulators of cell division are indicated in green. Opportunities for tumor treatment are indicated in blue. E2 = estradiol; TZDs = thiazolidinediones; VDR = Vitamin D receptor." ] ] 1 => array:7 [ "identificador" => "fig2" "etiqueta" => "Figure 2" "tipo" => "MULTIMEDIAFIGURA" "mostrarFloat" => true "mostrarDisplay" => false "figura" => array:1 [ 0 => array:4 [ "imagen" => "gr2.jpeg" "Alto" => 549 "Ancho" => 662 "Tamanyo" => 38911 ] ] "descripcion" => array:1 [ "en" => "Beyond inactivation of the MEN1 gene, additional mutations in other genes may be responsible for acceleration of tumor growth, thus involving a process of multistep tumorigenesis. Deregulation of normal neuroendocrine development/differentiation can occur through a range of processes, e.g. activation of the PI3K pathway leads to AKT phosphorylation, triggering a downstream cascade of events. Deregulation of this pathway can occur through several mechanisms: 1) gain of function by oncogenic mutations of PIK3; 2) loss of function of the tumor suppressor PTEN through gene deletion, mutation, micro-RNA expression, or epigenetic silencing; 3) amplification or mutation of AKT isoforms; 4) upstream activation through RTK signalling; 5) downstream loss of the tumor suppressors p18 and p27; 6) increased RAS expression, or activating mutations of RAF, MEK, or ERK, which accelerate cell proliferation. Opportunities for treatment are in blue. NSAIDs = non-steroidal anti-inflammatory drugs; RTK = receptor tyrosine kinase; TZDs = thiazolidinediones." ] ] 2 => array:7 [ "identificador" => "tbl1" "etiqueta" => "Table 1" "tipo" => "MULTIMEDIATABLA" "mostrarFloat" => true "mostrarDisplay" => false "tabla" => array:2 [ "tablatextoimagen" => array:1 [ 0 => array:1 [ "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="top" scope="col">Protein \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="center" valign="top" scope="col">Function \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="center" valign="top" scope="col">Reference \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="top">A Chromatin modification proteins \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="" valign="\n \t\t\t\t\ttop\n \t\t\t\t"> \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="" valign="\n \t\t\t\t\ttop\n \t\t\t\t"> \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="top">HDAC1<a class="elsevierStyleCrossRef" href="#tfn1">∗</a>) \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="center" valign="top">Chromatin modification \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="center" valign="top">Kim et al. (<a class="elsevierStyleCrossRef" href="#bib18">18</a>) \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="top">MLL \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="center" valign="top">Chromatin modification \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="center" valign="top">Yokoyama et al. (<a class="elsevierStyleCrossRef" href="#bib17">17</a>) \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="top">MLL2 \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="center" valign="top">Chromatin modification \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="center" valign="top">Hughes et al. (<a class="elsevierStyleCrossRef" href="#bib12">12</a>) \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="top">mSin3A<a class="elsevierStyleCrossRef" href="#tfn1">∗</a>) \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="center" valign="top">Chromatin modification \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="center" valign="top">Kim et al. (<a class="elsevierStyleCrossRef" href="#bib18">18</a>) \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="top">LEDGF \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="center" valign="top">Chromatin-associated \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="center" valign="top">Yokoyama et al. (<a class="elsevierStyleCrossRef" href="#bib20">20</a>) \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="top">B Transcription factors \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="" valign="\n \t\t\t\t\ttop\n \t\t\t\t"> \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="" valign="\n \t\t\t\t\ttop\n \t\t\t\t"> \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="top">JunD \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="center" valign="top">Gene transcription \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="center" valign="top">Agarwal et al. (<a class="elsevierStyleCrossRef" href="#bib21">21</a>) \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="top">NF-κB \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="center" valign="top">Gene transcription \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="center" valign="top">Heppner et al. (<a class="elsevierStyleCrossRef" href="#bib22">22</a>) \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="top">Pem \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="center" valign="top">Gene transcription \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="center" valign="top">Lemmens et al. (<a class="elsevierStyleCrossRef" href="#bib23">23</a>) \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="top">Smad \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="center" valign="top">Gene transcription \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="center" valign="top">Kaji et al. (<a class="elsevierStyleCrossRef" href="#bib24">24</a>) \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="top">TGF-β \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="center" valign="top">Gene transcription \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="center" valign="top">Shattuck et al. (<a class="elsevierStyleCrossRef" href="#bib25">25</a>) \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="top">WNT/β-catenin<a class="elsevierStyleCrossRef" href="#tfn1">∗</a>) \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="center" valign="top">Gene transcription \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="center" valign="top">Chen et al. (<a class="elsevierStyleCrossRef" href="#bib26">26</a>) \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="top">ERα \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="center" valign="top">Gene transcription \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="center" valign="top">Dreijerink et al. (<a class="elsevierStyleCrossRef" href="#bib27">27</a>) \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="top">VDR \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="center" valign="top">Gene transcription \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="center" valign="top">Dreijerink et al. (<a class="elsevierStyleCrossRef" href="#bib27">27</a>) \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="top">PPARγ \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="center" valign="top">Gene transcription \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="center" valign="top">Dreijerink et al. (<a class="elsevierStyleCrossRef" href="#bib27">27</a>) \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="top">FOXO1<a class="elsevierStyleCrossRef" href="#tfn1">∗</a>) \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="center" valign="top">Gene transcription \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="center" valign="top">Wuescher et al. (<a class="elsevierStyleCrossRef" href="#bib28">28</a>) \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="top">C DNA repair proteins \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="" valign="\n \t\t\t\t\ttop\n \t\t\t\t"> \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="" valign="\n \t\t\t\t\ttop\n \t\t\t\t"> \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="top">RPA2 \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="center" valign="top">DNA replication \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="center" valign="top">Sukhodolets et al.(<a class="elsevierStyleCrossRef" href="#bib29">29</a>) \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="top">ASK \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="center" valign="top">Cell cycle regulation \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="center" valign="top">Schnepp et al. 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(<a class="elsevierStyleCrossRef" href="#bib37">37</a>) \t\t\t\t\t\t\n \t\t\t\t</td></tr></tbody></table> """ ] ] ] "notaPie" => array:1 [ 0 => array:3 [ "identificador" => "tfn1" "etiqueta" => "∗" "nota" => "Proteins in a complex with menin, possibly not through a direct interaction." ] ] ] "descripcion" => array:1 [ "en" => "Menin-interacting proteins." ] ] ] "bibliografia" => array:2 [ "titulo" => "REFERENCES" "seccion" => array:1 [ 0 => array:2 [ "identificador" => "cebibsec10" "bibliografiaReferencia" => array:92 [ 0 => array:3 [ "identificador" => "bib1" "etiqueta" => "1" "referencia" => array:1 [ 0 => array:2 [ "contribucion" => array:1 [ 0 => array:2 [ "titulo" => "Germline mutation profile of MEN1 in multiple endocrine neoplasia type 1: search for correlation between phenotype and the functional domains of the MEN1 protein" "autores" => array:1 [ 0 => array:2 [ "etal" => true "autores" => array:6 [ 0 => """ V Wautot \n \t\t\t\t\t\t\t\t """ 1 => """ C Vercherat \n \t\t\t\t\t\t\t\t """ 2 => """ J Lespinasse \n \t\t\t\t\t\t\t\t """ 3 => """ B Chambe \n \t\t\t\t\t\t\t\t """ 4 => """ GM Lenoir \n \t\t\t\t\t\t\t\t """ 5 => """ CX Zhang \n \t\t\t\t\t\t\t\t """ ] ] ] ] ] "host" => array:1 [ 0 => array:2 [ "doi" => "10.1002/humu.10092" "Revista" => array:7 [ "tituloSerie" => "Hum Mutat" "fecha" => "2002" "volumen" => "20" "numero" => "1" "paginaInicial" => "35" "paginaFinal" => "47" "link" => array:1 [ 0 => array:2 [ "url" => "https://www.ncbi.nlm.nih.gov/pubmed/12112656" "web" => "Medline" ] ] ] ] ] ] ] ] 1 => array:3 [ "identificador" => "bib2" "etiqueta" => "2" "referencia" => array:1 [ 0 => array:2 [ "contribucion" => array:1 [ 0 => array:2 [ "titulo" => "Genotype-phenotype analysis in multiple endocrine neoplasia type 1" "autores" => array:1 [ 0 => array:2 [ "etal" => true "autores" => array:6 [ 0 => """ MA Kouvaraki \n \t\t\t\t\t\t\t\t """ 1 => """ JE Lee \n \t\t\t\t\t\t\t\t """ 2 => """ SE Shapiro \n \t\t\t\t\t\t\t\t """ 3 => """ RF Gagel \n 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, Koen M. DreijerinkI, Jo W. HöppenerII

I University Medical Center Utrecht, Department of Internal Medicine & Endocrinology, Utrecht, The Netherlands.

II University Medical Center Utrecht, Department of Metabolic & Endocrine Diseases, Utrecht, The Netherlands.

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    "titulo" => "Variable clinical expression in patients with a germline <span class="elsevierStyleItalic">MEN1</span> disease gene mutation&#58; clues to a genotype&#8211;phenotype correlation"
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        "autoresLista" => "Cornelis J&#46; Lips, Koen M&#46; Dreijerink, Jo W&#46; H&#246;ppener"
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          "en" => "<p id="spara20" class="elsevierStyleSimplePara elsevierViewall">Beyond inactivation of the <span class="elsevierStyleItalic">MEN1</span> gene&#44; additional mutations in other genes may be responsible for acceleration of tumor growth&#44; thus involving a process of multistep tumorigenesis&#46; Deregulation of normal neuroendocrine development&#47;differentiation can occur through a range of processes&#44; e&#46;g&#46; activation of the PI3K pathway leads to AKT phosphorylation&#44; triggering a downstream cascade of events&#46; Deregulation of this pathway can occur through several mechanisms&#58; 1&#41; gain of function by oncogenic mutations of PIK3&#59; 2&#41; loss of function of the tumor suppressor PTEN through gene deletion&#44; mutation&#44; micro-RNA expression&#44; or epigenetic silencing&#59; 3&#41; amplification or mutation of AKT isoforms&#59; 4&#41; upstream activation through RTK signalling&#59; 5&#41; downstream loss of the tumor suppressors p18 and p27&#59; 6&#41; increased RAS expression&#44; or activating mutations of RAF&#44; MEK&#44; or ERK&#44; which accelerate cell proliferation&#46; Opportunities for treatment are in blue&#46; NSAIDs &#61; non-steroidal anti-inflammatory drugs&#59; RTK &#61; receptor tyrosine kinase&#59; TZDs &#61; thiazolidinediones&#46;</p>"
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    "textoCompleto" => "<span class="elsevierStyleSections"><span id="cesec10" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="cestitle20">INTRODUCTION</span><p id="para10" class="elsevierStylePara elsevierViewall">&#8222;It is an old experience that through her errors&#44; Nature often grants us unexpected insights into her secrets which are otherwise a closed domain&#8220;&#44; William Harvey&#44; 1657&#46;</p><p id="para20" class="elsevierStylePara elsevierViewall">Multiple endocrine neoplasia type 1 &#40;MEN1&#41; is an inherited endocrine tumor syndrome&#44; characterized predominantly by tumors of the parathyroid glands&#44; gastroenteropancreatic tumors&#44; pituitary adenomas&#44; adrenal adenomas&#44; and neuroendocrine tumors of the thymus&#44; lungs or stomach&#46; MEN1 is caused by germline mutations of the <span class="elsevierStyleItalic">MEN1</span> tumor suppressor gene&#46; It appears that in the MEN1 syndrome&#44; clinical expression differs between families&#46; This may be the result of the specific <span class="elsevierStyleItalic">MEN1</span> gene mutation in a family &#40;genotype&#8211;phenotype correlation&#41;&#46; As a rule&#44; the development of a tumor depends on a series of genetic events &#40;multistep tumorigenesis&#41;&#46; Thus&#44; additional co-segregating modifying factors such as germline mutations in other genes are likely to play a role in the interfamilial variability of MEN 1&#46; Moreover&#44; clinical expression can also vary between individual members of the same family&#44; possibly because of additional genetic or epigenetic factors&#46; To date&#44; a clear correlation between genetic events and the variable clinical expression of MEN1 has not been established &#40;<a class="elsevierStyleCrossRefs" href="#bib1">1&#8211;5</a>&#41;&#46; Further understanding of the genetic aspects of MEN1 and the pathogenesis of MEN1-related tumors could enable more tailored clinical screening and treatment strategies&#46;</p><p id="para30" class="elsevierStylePara elsevierViewall">In this review&#44; we discuss recent reports on aberrant clinical expression of MEN1&#44; which may allow us a glimpse into the pathogenesis of this intriguing disorder&#46;</p><p id="para40" class="elsevierStylePara elsevierViewall">In 1903&#44; Erdheim described the case of an acromegalic patient with a pituitary adenoma and three enlarged parathyroid glands&#46; Fifty years later&#44; Underdahl et al&#46; reported eight patients with a syndrome of pituitary-&#44; parathyroid-&#44; and pancreatic islet adenomas&#46; In 1954&#44; Wermer found that the syndrome was transmitted as a dominant trait &#40;<a class="elsevierStyleCrossRef" href="#bib6">6</a>&#41;&#46; In 1968&#44; Steiner et al&#46; introduced the term &#8220;multiple endocrine neoplasia&#8221; &#40;MEN&#41; to describe disorders featuring combinations of endocrine tumors&#59; they designated the Wermer syndrome as MEN1 and the Sipple syndrome as MEN2&#46; Gorlin subdivided type 2 into A and B&#46; Then&#44; in 1975&#44; Khairi &#40;<a class="elsevierStyleCrossRef" href="#bib7">7</a>&#41; suggested that type 2B be called type 3&#59; however&#44; this was not generally accepted&#46; More recently&#44; in 2006&#44; families with multiple endocrine tumors but without <span class="elsevierStyleItalic">MEN1</span> or <span class="elsevierStyleItalic">RET</span> &#40;MEN2<span class="elsevierStyleItalic">&#41;</span> gene mutations were identified &#40;<a class="elsevierStyleCrossRef" href="#bib8">8</a>&#41;&#46; This related syndrome is referred to as MEN4&#46;</p></span><span id="cesec20" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="cestitle30">DISCOVERY OF THE <span class="elsevierStyleItalic">MEN1</span> GENE</span><p id="para50" class="elsevierStylePara elsevierViewall">In positional cloning&#44; gene mapping precedes&#44; and eventually leads to&#44; gene identification&#46; The first step is mapping the gene to a specific chromosomal region by linkage analysis&#46; The second step is identifying the correct gene among all possible candidate genes within that particular chromosomal region&#46; After the gene has been identified&#44; it is possible to study its &#40;patho&#41;physiologic function&#46;</p><p id="para60" class="elsevierStylePara elsevierViewall">In 1996&#44; two groups independently identified the <span class="elsevierStyleItalic">MEN1</span> gene on chromosome 11q13 &#40;<a class="elsevierStyleCrossRef" href="#bib9">9</a>&#41;&#44;&#40;<a class="elsevierStyleCrossRef" href="#bib10">10</a>&#41;&#46; To date&#44; more than 1336 different <span class="elsevierStyleItalic">MEN1</span> gene mutations &#40;both germline and sporadic&#41; have been reported in the literature &#40;<a class="elsevierStyleCrossRef" href="#bib4">4</a>&#41;&#46; Most of these mutations are clearly inactivating&#44; in accordance with the notion that the <span class="elsevierStyleItalic">MEN1</span> gene is a tumor suppressor gene&#46; There are no mutational hot spots in the <span class="elsevierStyleItalic">MEN1</span> gene&#46;</p></span><span id="cesec30" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="cestitle40">FUNCTION OF THE <span class="elsevierStyleItalic">MEN1</span>-GENE PRODUCT</span><p id="para70" class="elsevierStylePara elsevierViewall">The <span class="elsevierStyleItalic">MEN1</span> gene product&#44; menin&#44; functions as an adaptor protein that is involved in interactions with multiple protein partners&#46; <span class="elsevierStyleItalic">Men1</span> null mutant mice have indicated that menin is essential for viability &#40;<a class="elsevierStyleCrossRef" href="#bib11">11</a>&#41;&#46; Menin is involved in neuroendocrine cell development and function&#46; Later on&#44; it is active in many cellular processes&#44; including gene transcription regulation&#44; DNA replication&#44; DNA repair&#44; and signal transduction&#46;</p><p id="para80" class="elsevierStylePara elsevierViewall">Menin target genes that are important for development and proliferation&#44; including homeobox domain &#40;HOX&#41; genes&#44; the <span class="elsevierStyleItalic">CDKN2C</span> and <span class="elsevierStyleItalic">CDKN1B</span> cyclin-dependent kinase inhibiting genes&#44; the human telomerase &#40;<span class="elsevierStyleItalic">hTERT</span>&#41; gene&#44; and nuclear receptor target genes &#40;<a class="elsevierStyleCrossRefs" href="#bib12">12&#8211;15</a>&#41;&#46;</p><p id="para90" class="elsevierStylePara elsevierViewall">As a transcriptional co-regulator&#44; menin may function as a co-activator or co-repressor by recruiting histone-modifying enzymatic activity &#40;<a class="elsevierStyleCrossRef" href="#bib12">12</a>&#41;&#44;&#40;<a class="elsevierStyleCrossRef" href="#bib15">15</a>&#41;&#44;&#40;<a class="elsevierStyleCrossRef" href="#bib16">16</a>&#41;&#46; As a co-activator&#44; menin is involved in the regulation of histone methylation by recruiting the mixed-lineage leukaemia &#40;MLL&#41; proteins MLL1 and MLL2 &#40;<a class="elsevierStyleCrossRef" href="#bib12">12</a>&#41;&#44;&#40;<a class="elsevierStyleCrossRef" href="#bib17">17</a>&#41;&#46; In this way&#44; menin can bind to nuclear receptors and activate nuclear receptor-mediated gene transcription &#40;<a class="elsevierStyleCrossRef" href="#bib12">12</a>&#41;&#44;&#40;<a class="elsevierStyleCrossRef" href="#bib15">15</a>&#41;&#46; By tethering histone deacetylase activity to genes&#44; menin can serve as a repressor of transcription &#40;<a class="elsevierStyleCrossRef" href="#bib18">18</a>&#41;&#46;</p><p id="para100" class="elsevierStylePara elsevierViewall">In order to understand the role of menin as a tumor suppressor protein and as a co-factor of MLL fusion proteins&#44; the structural basis had to be revealed&#46; Recently&#44; the crystal structure of menin in <span class="elsevierStyleItalic">Nematostella vectensis</span> was reported &#40;<a class="elsevierStyleCrossRef" href="#bib19">19</a>&#41;&#46; Knowledge about the three-dimensional structure may elucidate the interactions essential to the function of menin&#46; It appears that the Leucine&#44; Leucine&#44; Tryptophan&#44; Leucine&#44; Leucine &#40;LLWLL&#41; amino acids nuclear receptor interaction motif of menin is well-conserved and is located in an alpha-helix&#46; In general&#44; modeling gene mutations into this structure will be helpful in determining the effects on protein function&#46; Inactivation of the <span class="elsevierStyleItalic">MEN1</span> gene results in predisposition to tumor formation &#40;see <a class="elsevierStyleCrossRef" href="#fig1">Figure 1</a>&#41;&#44; <a class="elsevierStyleCrossRef" href="#tbl1">Table 1</a>&#46;</p><elsevierMultimedia ident="fig1"></elsevierMultimedia><elsevierMultimedia ident="tbl1"></elsevierMultimedia></span><span id="cesec40" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="cestitle50">ABERRANT CLINICAL EXPRESSION OF MEN1</span><p id="para110" class="elsevierStylePara elsevierViewall">A <span class="elsevierStyleItalic">MEN1</span> gene mutation may be completely detrimental to gene function&#46; It may also result in a protein product with some residual function&#46; An aberrant menin protein may be impaired in its function by several mechanisms&#58; menin can interact with many different proteins&#46; Possibly&#44; germline mutations in the <span class="elsevierStyleItalic">MEN1</span> gene selectively affect menin binding to its partners&#44; leading to distinct phenotypes&#46;</p><p id="para120" class="elsevierStylePara elsevierViewall">The type of missense mutation &#40;e&#46;g&#46; replacement of arginine with glycine&#41; may have a differential effect on the function of menin &#40;<a class="elsevierStyleCrossRef" href="#bib38">38</a>&#41;&#58; in-frame or missense mutations differ from frameshift&#47;nonsense mutations &#40;<a class="elsevierStyleCrossRef" href="#bib39">39</a>&#41;&#44; whereas missense and in-frame mutations may affect the interactions of a menin domain with transcription factors such as JunD&#44; Smad3 and NFkappaB and nuclear receptors &#40;<a class="elsevierStyleCrossRef" href="#bib1">1</a>&#41;&#44; or impair sensitization to apoptosis from caspase-3&#44; p53 or p21 &#40;<a class="elsevierStyleCrossRef" href="#bib40">40</a>&#41;&#46; A <span class="elsevierStyleItalic">MEN1</span> gene missense mutation may result in protein instability&#44; and enhanced and early proteolytic degradation via the ubiquitin&#8211;proteasome pathway &#40;<a class="elsevierStyleCrossRef" href="#bib41">41</a>&#41;&#46;</p><p id="para130" class="elsevierStylePara elsevierViewall">It was generally assumed that&#44; in contrast to MEN2&#44; in MEN1 there is no clear genotype&#8211;phenotype correlation &#40;<a class="elsevierStyleCrossRef" href="#bib1">1</a>&#41;&#44;&#40;<a class="elsevierStyleCrossRefs" href="#bib3">3&#8211;5</a>&#41;&#46; However&#44; several reports challenge this assumption&#46;</p><span id="cesec50" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="cestitle60">Familial aberrant expression</span><span id="cesec60" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="cestitle70">1&#46; MEN1 Burin</span><p id="para140" class="elsevierStylePara elsevierViewall">Four large kindreds from the Burin peninsula&#47;Fortune Bay area of Newfoundland with prominent features of prolactinomas&#44; in addition to carcinoids&#44; and parathyroid tumors &#40;referred to as MEN1Burin&#41; have been described&#44; and they show linkage to 11q13&#44; the same locus as that of MEN1&#46; Haplotype analysis with 16 polymorphic markers now reveals that representative affected individuals from all four families share a common haplotype over a 2&#46;5 Mb region&#46; A nonsense mutation in the <span class="elsevierStyleItalic">MEN1</span> gene has been found to be responsible for the disease in the affected members in all four of the MEN1-Burin families&#46; This suggests that either a common ancestral mutation in the <span class="elsevierStyleItalic">MEN1</span>-Burin gene or a modifying gene on 11q13 is responsible for this prolactinoma variant of MEN1 &#40;<a class="elsevierStyleCrossRefs" href="#bib42">42&#8211;45</a>&#41;&#46;</p></span><span id="cesec70" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="cestitle80">2&#46; Familiar isolated hyperparathyroidism and <span class="elsevierStyleItalic">MEN1</span> gene missense mutations</span><p id="para150" class="elsevierStylePara elsevierViewall">Familial isolated primary hyperparathyroidism &#40;FIHP&#41; is an autosomal dominant disorder that can represent an early stage of either MEN1 caused by an allelic variant of the <span class="elsevierStyleItalic">MEN1</span> gene&#44; or of hyperparathyroidism&#8211;jaw tumor &#40;HPT-JT&#41; syndromes&#59; alternatively&#44; the condition can be caused by an allelic variant of the hyperparathyroidism 2 &#40;<span class="elsevierStyleItalic">HRPT2</span>&#41; gene&#44; or caused by a mutation at another locus&#46; Interestingly&#44; the major proportion of <span class="elsevierStyleItalic">MEN1</span> gene germline mutations that have been found in FIHP are seemingly mild missense mutations or in-frame deletions &#40;<a class="elsevierStyleCrossRefs" href="#bib46">46&#8211;55</a>&#41;&#46; In MEN1&#44; roughly 80&#37; of patients harbor nonsense mutations&#46;</p></span><span id="cesec80" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="cestitle90">3&#46; Predominant mutations in MEN1 pancreatic neuroendocrine tumors</span><p id="para160" class="elsevierStylePara elsevierViewall">Schaaf performed mutation analysis of the <span class="elsevierStyleItalic">MEN1</span> gene in tumors from 306 patients with MEN1&#44; and found that patients with gastroenteropancreatic tumors more often had truncating mutations&#44; very probably leading to completely inactivated menin &#40;<a class="elsevierStyleCrossRef" href="#bib56">56</a>&#41;&#46;</p></span><span id="cesec90" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="cestitle100">4&#46; Mild&#47;late onset versus malignant phenotypes</span><p id="para170" class="elsevierStylePara elsevierViewall">To date&#44; several disease-related <span class="elsevierStyleItalic">MEN1</span> gene intron mutations have been reported&#46; These intron mutations may affect mRNA splicing and cause mild phenotypes&#44; with late&#44; and relatively low&#44; penetrance of the disease &#40;<a class="elsevierStyleCrossRefs" href="#bib57">57&#8211;59</a>&#41;&#46; However&#44; clinical expression at a young age may occur&#46; This may be explained by interpatient variations in gene transcription and translation of the <span class="elsevierStyleItalic">MEN1</span> gene&#46;</p><p id="para180" class="elsevierStylePara elsevierViewall">Two recent case reports described families with a high penetrance of malignant neuroendocrine tumors of the pancreas &#40;<a class="elsevierStyleCrossRef" href="#bib60">60</a>&#41;&#44;&#40;<a class="elsevierStyleCrossRef" href="#bib61">61</a>&#41;&#46; Both these families carried germline mutations that completely abolish menin function&#46;</p><p id="para190" class="elsevierStylePara elsevierViewall">The earliest manifestation of MEN1 was a pituitary adenoma in a 5-year-old boy who had a missense mutation leading to a H139D substitution in the <span class="elsevierStyleItalic">MEN1</span> protein &#40;<a class="elsevierStyleCrossRef" href="#bib62">62</a>&#41;&#46; Functional analysis of the mutant protein revealed severely reduced protein stability &#40;<a class="elsevierStyleCrossRef" href="#bib41">41</a>&#41;&#44; reduced binding to JunD &#40;<a class="elsevierStyleCrossRef" href="#bib16">16</a>&#41;&#44; reduced binding to the estrogen receptor alpha and absent histone-methylation recruiting capacity&#46; Thus&#44; functional analysis of this potentially mild missense <span class="elsevierStyleItalic">MEN1</span> gene mutation shows that the protein product is&#44; in fact&#44; completely inactivated&#46;</p></span><span id="cesec100" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="cestitle110">5&#46; Metabolic effects of aberrant expression of the <span class="elsevierStyleItalic">MEN1</span> gene</span><p id="para200" class="elsevierStylePara elsevierViewall">In <span class="elsevierStyleItalic">MEN1</span> disease-gene carriers&#44; all vitamin D receptors &#40;VDRs&#41; and peroxisome proliferator-activated receptors &#40;PPARs&#41;-&#947; are expressed but are probably less activated because of impaired menin function&#46;</p><p id="para210" class="elsevierStylePara elsevierViewall">A&#46; PPAR&#947;2 is a transcription factor that plays a key role in adipocyte differentiation&#46; Polymorphisms in this gene may contribute to the variability in body mass index and insulin sensitivity in the general population&#46; PPAR&#947; is the receptor for the thiazolidinediones&#44; which act as PPAR&#947; agonists and lower the blood glucose levels in patients with type 2 diabetes mellitus by increasing insulin sensitivity&#46; Individuals with dominant-negative PPAR&#947; gene mutations manifest a syndrome that combines lipodystrophy with features of the metabolic syndrome&#44; including insulin resistance&#44; type 2 diabetes&#44; hepatic steatosis&#44; dyslipidemia&#44; hypertension and &#40;in women&#41; polycystic ovary syndrome&#46; In patients with MEN1&#44; decreased activation of PPAR may result in insulin resistance and weight gain &#40;<a class="elsevierStyleCrossRef" href="#bib63">63</a>&#41;&#46;</p><p id="para220" class="elsevierStylePara elsevierViewall">B&#46; Vitamin D receptors &#40;VDRs&#41; are found in a large number of tissues beyond the classic target tissues gut&#44; bone and kidney&#46; These tissues include endocrine glands such as pituitary&#44; parathyroid glands&#44; pancreatic islets&#44; etc&#46;</p><p id="para230" class="elsevierStylePara elsevierViewall">Louren&#231;o et al&#46; discussed the increased bone loss pattern found in patients with MEN1 compared with that of patients with sporadic primary HPT &#40;<a class="elsevierStyleCrossRef" href="#bib64">64</a>&#41;&#46; Besides increased bone loss&#44; resistance to vitamin D may be associated with insulin resistance and beta cell dysfunction&#44; leading to increased risk for type 2 diabetes in patients with MEN1 &#40;<a class="elsevierStyleCrossRef" href="#bib65">65</a>&#41;&#44;&#40;<a class="elsevierStyleCrossRef" href="#bib66">66</a>&#41;&#46;</p></span></span><span id="cesec110" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="cestitle120">Effect of gender</span><p id="para240" class="elsevierStylePara elsevierViewall">The prevalence and probability of pancreatic tumors among patients with MEN1 were higher in males than in females&#46; This difference was due to the differential occurrence of gastrinomas&#46; The prevalence and probability of developing pituitary adenomas were significantly greater in females&#46; Thymic tumors are found nearly exclusively in male MEN1 patients &#40;<a class="elsevierStyleCrossRef" href="#bib67">67</a>&#41;&#46;</p><p id="para250" class="elsevierStylePara elsevierViewall">The difference in clinical expression between the genders may be explained by the difference in transcription regulation of estrogen and androgen receptors&#46; Menin can act as a co-activator of nuclear hormone receptors including estrogen &#40;ER&#945;&#41; and possibly androgen &#40;AR&#41; receptors&#46; A defect in the <span class="elsevierStyleItalic">MEN1</span> gene&#44; together with gender-specific differences in concentrations of the hormones involved and tissue-specific distribution of their receptors&#44; may contribute to the observed gender-specific differences in prevalence of prolactinoma and gastrinoma&#46;</p></span><span id="cesec120" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="cestitle130">Additional genetic effects</span><span id="cesec130" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="cestitle140">1&#46; Loss of heterozygosity&#59; the AIP gene</span><p id="para260" class="elsevierStylePara elsevierViewall">In accordance with the tumor suppressor function of menin&#44; MEN1-associated tumors exhibit loss of the wild-type allele&#46; This second hit occurs as a somatic mutation and often involves deletion of a larger chromosomal region containing multiple genes &#91;loss of heterozygosity &#40;LOH&#41;&#93;&#46;</p><p id="para270" class="elsevierStylePara elsevierViewall">The gene encoding the aryl hydrocarbon receptor interacting protein &#40;AIP&#41; is located on 11q13&#44; in the vicinity of the <span class="elsevierStyleItalic">MEN1</span> gene&#46; Recently&#44; it was found that inactivating mutations in the <span class="elsevierStyleItalic">AIP</span> gene are the underlying cause of low-penetrance pituitary adenoma predisposition&#46; The finding of a truncated gene and LOH indicates that <span class="elsevierStyleItalic">AIP</span> acts as a tumor suppressor gene &#40;<a class="elsevierStyleCrossRef" href="#bib68">68</a>&#41;&#44;&#40;<a class="elsevierStyleCrossRef" href="#bib69">69</a>&#41;&#46; In northern Finland&#44; <span class="elsevierStyleItalic">AIP</span>-germline mutations accounted for 16&#37; of cases of acromegaly in young patients&#46; The tumor suppressor genes <span class="elsevierStyleItalic">AIP</span> and <span class="elsevierStyleItalic">MEN1</span> are located 3 Mb apart&#46; Concomitant deletions of these genes may underlie predisposition to MEN1 and pituitary adenoma&#46; To what extent deletion of the <span class="elsevierStyleItalic">AIP</span> gene is present in MEN1 tumors has yet to be established&#46; Inactivation of this gene in animal models may reveal a potential causative role in MEN1-associated tumors&#46;</p></span><span id="cesec140" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="cestitle150">2&#46; Genetic predisposition for other diseases</span><p id="para280" class="elsevierStylePara elsevierViewall">Genetic predisposition for other diseases may contribute to enhancement of tumor formation in patients with MEN1 &#40;<a class="elsevierStyleCrossRef" href="#bib70">70</a>&#41;&#46; For instance&#44; normally the vitamin D receptor on parathyroid cells inhibits production and release of parathyroid hormone &#40;PTH&#41;&#46; In families with inactivating mutations in the gene encoding VDR&#44; this is associated with end-organ resistance to calcitriol&#46;</p><p id="para290" class="elsevierStylePara elsevierViewall">In the parathyroid glands of patients with MEN1&#44; there exists a decreased activation of the VDR&#46; An additional defect in the VDR or calcium receptor may contribute to hyperactivity&#44; hyperplasia&#44; and adenoma &#40;<a class="elsevierStyleCrossRef" href="#bib71">71</a>&#41;&#46;</p></span><span id="cesec150" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="cestitle160">3&#46; Additional&#44; somatic mutations involved in acceleration of tumor growth</span><span id="cesec160" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="cestitle170">3a&#41;&#46; Data from other familial neuroendocrine tumor syndromes</span><p id="para300" class="elsevierStylePara elsevierViewall">How can we identify acquired mutations that are responsible for acceleration of tumor growth in MEN1&#63; Clues for modifier genes may be found in other familial neuroendocrine tumor syndromes such as MEN2 and MEN4 &#40;the latter is also referred to as MENX&#41;&#46; Which are their traditional pathogenetic pathways and are these involved in aberrant clinical MEN1 expression&#63; Overlap between MEN1 and MEN2 and additional genetic events have to be explored &#40;e&#46;g&#46; p18&#47;p27 knock-out mice develop both MEN1- and MEN2-associated tumors&#41; &#40;<a class="elsevierStyleCrossRef" href="#bib72">72</a>&#41;&#44;&#40;<a class="elsevierStyleCrossRef" href="#bib73">73</a>&#41;&#46;</p><p id="para310" class="elsevierStylePara elsevierViewall">Phenotypic overlap between MEN1- and MEN2-like syndromes was identified in the rat and named MENX&#46; The syndrome is caused by a germline inactivating mutation in the <span class="elsevierStyleItalic">CDKN1B</span> gene encoding p27<span class="elsevierStyleSup">Kip1</span> &#40;<a class="elsevierStyleCrossRef" href="#bib8">8</a>&#41;&#46; p27<span class="elsevierStyleSup">Kip1</span> has a key role in cell cycle regulation and is involved in differentiation&#44; apoptosis&#44; and angiogenesis&#46;</p><p id="para320" class="elsevierStylePara elsevierViewall">Subsequently&#44; germline mutations in the <span class="elsevierStyleItalic">CDKN1B</span> gene were identified in the germline of a MEN1-like family&#46; In these patients&#44; germline mutations of the <span class="elsevierStyleItalic">MEN1</span> gene could not be detected &#40;<a class="elsevierStyleCrossRef" href="#bib8">8</a>&#41;&#46; However&#44; only the menin-coding region and splice junctions were analyzed&#46; The patients were also negative for <span class="elsevierStyleItalic">RET</span> gene mutations &#40;MEN2&#41;&#46; Mutations in <span class="elsevierStyleItalic">CDKN1B</span> and related genes&#44; but without <span class="elsevierStyleItalic">MEN1</span> gene mutations&#44; are a rare cause of MEN1-like phenotype &#40;<a class="elsevierStyleCrossRefs" href="#bib74">74&#8211;76</a>&#41;&#46; As a consequence of mutations in the p27 gene&#44; a novel human MEN syndrome was recognized and named MEN4&#46;</p><p id="para330" class="elsevierStylePara elsevierViewall">In mice&#44; the <span class="elsevierStyleItalic">Cdkn2c</span> gene encoding p18<span class="elsevierStyleSup">Ink4c</span> was shown to collaborate with menin in suppression of neuroendocrine tumor development &#40;<a class="elsevierStyleCrossRef" href="#bib77">77</a>&#41;&#46; Whether occurrence of somatic mutations in p18<span class="elsevierStyleSup">Ink4c</span> and&#47;or p27<span class="elsevierStyleSup">Kip1</span> accelerates tumor growth in human MEN1 tumors has yet to be established&#46; In transgenic MEN2 mice and human patients with MEN2&#44; inactivating mutations in p18 will promote tumor growth &#40;<a class="elsevierStyleCrossRef" href="#bib72">72</a>&#41;&#44;&#40;<a class="elsevierStyleCrossRef" href="#bib73">73</a>&#41;&#44;&#40;<a class="elsevierStyleCrossRef" href="#bib78">78</a>&#41;&#44;&#40;<a class="elsevierStyleCrossRef" href="#bib79">79</a>&#41;&#46; Reduced expression of <span class="elsevierStyleItalic">CDKN1B</span>&#44; but not <span class="elsevierStyleItalic">CDKN2C</span>&#44; has been observed in parathyroid adenomas from patients with MEN1&#46;</p></span><span id="cesec170" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="cestitle180">3b&#41;&#46; Clues from sporadic parathyroid adenomas&#44; pituitary tumors&#44; and pancreatic NETs</span><span id="cesec180" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="cestitle190">i&#41; Sporadic Parathyroid adenoma</span><p id="para340" class="elsevierStylePara elsevierViewall">A high rate of somatic <span class="elsevierStyleItalic">MEN1</span> gene mutations is seen in sporadic parathyroid adenomas&#46; There exists an interaction between menin and the transforming growth factor &#40;TGF&#41;-beta&#47;Smad signaling pathway&#46; <span class="elsevierStyleItalic">In vitro</span> experimentation has demonstrated that the presence of menin is required for TGF-beta to effectively inhibit parathyroid cell proliferation and PTH production &#40;<a class="elsevierStyleCrossRef" href="#bib80">80</a>&#41;&#46;</p></span><span id="cesec190" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="cestitle200">ii&#41; Pituitary tumors</span><p id="para350" class="elsevierStylePara elsevierViewall">The pituitary tumor transforming gene &#40;PTTG&#59; securin&#41; was the first transforming gene found to be highly expressed in pituitary tumor cells&#44; and seems to play an important role in the process of oncogenesis&#46; Cell signaling abnormalities have been identified in pituitary tumors&#44; but their genetic basis is unknown&#46; Both Raf&#47;mitogen activated protein kinase kinase &#40;MEK&#41;&#47;extracellular signal-regulated kinase &#40;ERK&#41; and phosphoinositide 3-kinase&#40;PI3K&#41;&#47;Akt&#47;mammalian target of rapamycin &#40;mTOR&#41; pathways are over-expressed and&#47;or over-activated in pituitary tumors &#40;<a class="elsevierStyleCrossRef" href="#bib81">81</a>&#41;&#46; These pathways share a common root&#44; including initial activation by a tyrosine kinase receptor&#46;</p><p id="para360" class="elsevierStylePara elsevierViewall">Pit-1 is a direct transcriptional target of VDR&#46; Recruitment of histone deacetylase 1 is involved in the repressive effect of VDR on Pit-1 expression &#40;<a class="elsevierStyleCrossRef" href="#bib82">82</a>&#41;&#46;</p><p id="para370" class="elsevierStylePara elsevierViewall">There is a critical role for the growth factor activin in regulating inhibition of pituitary cell growth and Pit-1&#47;PRL expression through the Smads and menin &#40;<a class="elsevierStyleCrossRef" href="#bib83">83</a>&#41;&#46; Alterations in the activin&#47;TGF-beta downstream signaling pathways may be critical steps towards tumor formation and progression &#40;<a class="elsevierStyleCrossRef" href="#bib84">84</a>&#41;&#46; To date&#44; the occurrence of additional TGF-beta&#44; Pit-1&#44; PTTG&#44; or VDR mutations in MEN1-associated tumors has not been published&#46;</p></span><span id="cesec200" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="cestitle210">iii&#41; Pancreatic neuroendocrine tumors</span><p id="para380" class="elsevierStylePara elsevierViewall">In nonfamilial pancreatic neuroendocrine tumors &#40;PanNETs&#41; the most commonly mutated genes specify proteins implicated in chromatin remodeling&#58; 44&#37; of the tumors had somatic inactivating mutations in <span class="elsevierStyleItalic">MEN1&#46;</span> Clinically&#44; mutations in the <span class="elsevierStyleItalic">MEN1</span> gene were associated with better prognosis&#46; Also&#44; mutations in genes in the mTOR pathway were found in 14&#37; of the tumors&#44; a finding that could potentially be used to stratify patients for treatment with mTOR inhibitors &#40;<a class="elsevierStyleCrossRef" href="#bib85">85</a>&#41;&#46;</p><p id="para390" class="elsevierStylePara elsevierViewall">Loss of menin expression is associated with over-expression of the Raf&#47;MEK&#47;ERK and P13K&#47;AKT&#47;mTOR pathways in pancreatic tumors &#40;<a class="elsevierStyleCrossRef" href="#bib34">34</a>&#41;&#46; Intact menin has an essential role in WNT&#47;&#946;-catenin signaling&#44; and inhibits mouse pancreatic islet tumor proliferation &#40;<a class="elsevierStyleCrossRef" href="#bib26">26</a>&#41;&#46; Menin regulates subcellular localization of &#946;-catenin via nuclear-cytoplasmic shuttling&#46; Loss of menin leads to Wnt&#47;&#946;-catenin signaling activation&#46; Expression of p27 was found to be repressed in pancreatic islet cell tumors &#40;<a class="elsevierStyleCrossRef" href="#bib86">86</a>&#41;&#46;</p></span></span><span id="cesec210" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="cestitle220">3c&#41; Pathways in multistep carcinogenesis</span><p id="para400" class="elsevierStylePara elsevierViewall">It appears that interaction of components of the PI3K&#47;AKT pathway is involved in neuroendocrine tumor formation &#40;<a class="elsevierStyleCrossRef" href="#bib87">87</a>&#41;&#44;&#40;<a class="elsevierStyleCrossRef" href="#bib88">88</a>&#41;&#46; Deregulation of the PI3K&#47;AKT pathway in neuroendocrine tumors can occur through a range of processes &#40;see <a class="elsevierStyleCrossRef" href="#fig2">Figure 2</a>&#41;&#44; including gain of function by oncogenic mutations of PI3K signalling&#44; loss of function of the tumor suppressor PTEN through gene deletion&#44; mutation&#44; micro-RNA expression or epigenetic silencing&#44; upstream activation through receptor tyrosine kinase &#40;RTK&#41; signaling&#44; and&#47;or downstream loss of the tumor suppressors p18 and p27&#46;</p><elsevierMultimedia ident="fig2"></elsevierMultimedia><p id="para410" class="elsevierStylePara elsevierViewall">A combination of a mutation in the <span class="elsevierStyleItalic">MEN1</span> disease gene with other specific mutations of genes in the PI3K&#47;AKT pathway may be associated with acceleration of tumor growth&#46;</p><p id="para420" class="elsevierStylePara elsevierViewall">In addition&#44; inactivated or absent menin promotes RAS expression&#59; activating mutations of RAF&#44; MEK&#44; or ERK may accelerate cell proliferation &#40;<a class="elsevierStyleCrossRef" href="#bib89">89</a>&#41;&#46;</p></span></span></span><span id="cesec220" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="cestitle230">Ecogenetic factors</span><p id="para430" class="elsevierStylePara elsevierViewall">Common environmental factors may interact with genetic predisposition to MEN1 and contribute to enhancement of tumor formation &#40;<a class="elsevierStyleCrossRef" href="#bib70">70</a>&#41;&#46; In the parathyroid glands of patients with MEN1&#44; a diet low in vitamin D or calcium may result in tumor growth&#46; In the lactotropic cells of the pituitary gland&#44; estrogenic or neuroleptic drugs may stimulate cell division&#46; In the gastrin-producing cells of the stomach&#44; presence of achlorhydria or use of histamine-H2 receptor or proton pump blockers may promote tumor growth &#40;<a class="elsevierStyleCrossRef" href="#bib90">90</a>&#41;&#46; Lifestyle factors such as smoking and exposure to radiation may have deleterious effects on menin function and tumor growth&#44; as with many types of cancer&#46;</p></span></span><span id="cesec230" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="cestitle240">CONCLUDING REMARKS</span><p id="para440" class="elsevierStylePara elsevierViewall">Careful observation of patients and collaboration between disciplines&#44; including molecular endocrinology&#44; has opened new directions in the management of MEN1 syndrome&#44; and has promoted development of novel target-directed therapy&#46; Since 1980&#44; life expectancy and quality of life have improved considerably&#46;</p><p id="para450" class="elsevierStylePara elsevierViewall">By contrast&#44; thymic tumors and duodenopancreatic tumors&#44; including nonsecreting pancreatic tumors increase the risk of death &#40;<a class="elsevierStyleCrossRef" href="#bib91">91</a>&#41;&#46; Rare&#44; but aggressive&#44; adrenal tumors may also cause early death&#46; In <span class="elsevierStyleItalic">MEN1</span> disease gene carriers in MEN1 families&#44; most deaths were related to the disease&#44; and probably resulted from additional mutations&#46;</p><p id="para460" class="elsevierStylePara elsevierViewall">It is possible that consecutive and specific pathogenetic pathways are involved in MEN1 tumor formation&#46; We presume that&#44; through the inherited germline mutation resulting in organ-specific cell division&#44; the patient is rendered vulnerable to additional&#44; somatic mutations in these organs&#46; These mutations may occur spontaneously or may be triggered by life style and&#47;or environment&#46; Predisposition and expression of other genetic diseases may also be involved&#46; A complex genotype&#8211;phenotype relationship may be present&#46; Unfortunately&#44; for the majority of the patients it is not currently possible to predict the course of the disease&#46;</p><p id="para470" class="elsevierStylePara elsevierViewall">Germline mutations that result in complete inactivation of the gene product apparently cause more severe disease&#46;</p><p id="para480" class="elsevierStylePara elsevierViewall">Consequently&#44; extensive periodical clinical examination has to be performed in all carriers of the <span class="elsevierStyleItalic">MEN1</span> disease gene&#46; In the near future&#44; tumor gene-expression profiles and high throughput sequencing may permit more insight into additional genetic and epigenetic events that cause progression of tumor development&#46; Functional analysis of <span class="elsevierStyleItalic">MEN1</span> gene mutations is sometimes required to study the true effect of the mutation&#46; In addition&#44; as already suggested by Sir William Harvey&#44; it is very helpful to investigate rare presentations of diseases &#40;<a class="elsevierStyleCrossRef" href="#bib92">92</a>&#41;&#46; Eventually&#44; this insight may allow target-directed and mutation-specific therapy&#46;</p></span></span>"
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        0 => array:2 [
          "identificador" => "xpalclavsec1581202"
          "titulo" => "KEYWORDS"
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        1 => array:2 [
          "identificador" => "cesec10"
          "titulo" => "INTRODUCTION"
        ]
        2 => array:2 [
          "identificador" => "cesec20"
          "titulo" => "DISCOVERY OF THE MEN1 GENE"
        ]
        3 => array:2 [
          "identificador" => "cesec30"
          "titulo" => "FUNCTION OF THE MEN1-GENE PRODUCT"
        ]
        4 => array:3 [
          "identificador" => "cesec40"
          "titulo" => "ABERRANT CLINICAL EXPRESSION OF MEN1"
          "secciones" => array:4 [
            0 => array:3 [
              "identificador" => "cesec50"
              "titulo" => "Familial aberrant expression"
              "secciones" => array:5 [
                0 => array:2 [
                  "identificador" => "cesec60"
                  "titulo" => "1&#46; MEN1 Burin"
                ]
                1 => array:2 [
                  "identificador" => "cesec70"
                  "titulo" => "2&#46; Familiar isolated hyperparathyroidism and MEN1 gene missense mutations"
                ]
                2 => array:2 [
                  "identificador" => "cesec80"
                  "titulo" => "3&#46; Predominant mutations in MEN1 pancreatic neuroendocrine tumors"
                ]
                3 => array:2 [
                  "identificador" => "cesec90"
                  "titulo" => "4&#46; Mild&#47;late onset versus malignant phenotypes"
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                4 => array:2 [
                  "identificador" => "cesec100"
                  "titulo" => "5&#46; Metabolic effects of aberrant expression of the MEN1 gene"
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              ]
            ]
            1 => array:2 [
              "identificador" => "cesec110"
              "titulo" => "Effect of gender"
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            2 => array:3 [
              "identificador" => "cesec120"
              "titulo" => "Additional genetic effects"
              "secciones" => array:3 [
                0 => array:2 [
                  "identificador" => "cesec130"
                  "titulo" => "1&#46; Loss of heterozygosity&#59; the AIP gene"
                ]
                1 => array:2 [
                  "identificador" => "cesec140"
                  "titulo" => "2&#46; Genetic predisposition for other diseases"
                ]
                2 => array:3 [
                  "identificador" => "cesec150"
                  "titulo" => "3&#46; Additional&#44; somatic mutations involved in acceleration of tumor growth"
                  "secciones" => array:3 [
                    0 => array:2 [
                      "identificador" => "cesec160"
                      "titulo" => "3a&#41;&#46; Data from other familial neuroendocrine tumor syndromes"
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                    1 => array:3 [
                      "identificador" => "cesec170"
                      "titulo" => "3b&#41;&#46; Clues from sporadic parathyroid adenomas&#44; pituitary tumors&#44; and pancreatic NETs"
                      "secciones" => array:3 [
                        0 => array:2 [
                          "identificador" => "cesec180"
                          "titulo" => "i&#41; Sporadic Parathyroid adenoma"
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                        1 => array:2 [
                          "identificador" => "cesec190"
                          "titulo" => "ii&#41; Pituitary tumors"
                        ]
                        2 => array:2 [
                          "identificador" => "cesec200"
                          "titulo" => "iii&#41; Pancreatic neuroendocrine tumors"
                        ]
                      ]
                    ]
                    2 => array:2 [
                      "identificador" => "cesec210"
                      "titulo" => "3c&#41; Pathways in multistep carcinogenesis"
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              ]
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            3 => array:2 [
              "identificador" => "cesec220"
              "titulo" => "Ecogenetic factors"
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          "titulo" => "CONCLUDING REMARKS"
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          "titulo" => "REFERENCES"
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          "identificador" => "xpalclavsec1581202"
          "palabras" => array:5 [
            0 => "Multiple Endocrine Neoplasia type 1"
            1 => "MEN1"
            2 => "Menin"
            3 => "Genotype&#8211;Phenotype Correlation"
            4 => "Clinical Expression"
          ]
        ]
      ]
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    "resumen" => array:1 [
      "en" => array:1 [
        "resumen" => "<span id="ceabs10" class="elsevierStyleSection elsevierViewall"><p id="spara40" class="elsevierStyleSimplePara elsevierViewall">Multiple endocrine neoplasia type 1 is an inherited endocrine tumor syndrome&#44; predominantly characterized by tumors of the parathyroid glands&#44; gastroenteropancreatic tumors&#44; pituitary adenomas&#44; adrenal adenomas&#44; and neuroendocrine tumors of the thymus&#44; lungs or stomach&#46; Multiple endocrine neoplasia type 1 is caused by germline mutations of the multiple endocrine neoplasia type 1 tumor suppressor gene&#46; The initial germline mutation&#44; loss of the wild-type allele&#44; and modifying genetic and possibly epigenetic and environmental events eventually result in multiple endocrine neoplasia type 1 tumors&#46; Our understanding of the function of the multiple endocrine neoplasia type 1 gene product&#44; menin&#44; has increased significantly over the years&#46; However&#44; to date&#44; no clear genotype&#8211;phenotype correlation has been established&#46;</p><p id="spara50" class="elsevierStyleSimplePara elsevierViewall">In this review we discuss reports on exceptional clinical presentations of multiple endocrine neoplasia type 1&#44; which may provide more insight into the pathogenesis of this disorder and offer clues for a possible genotype&#8211;phenotype correlation&#46;</p></span>"
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    "NotaPie" => array:1 [
      0 => array:1 [
        "nota" => "<p class="elsevierStyleNotepara" id="cenpara20">No potential conflict of interest was reported&#46;</p> <p class="elsevierStyleNotepara" id="cenpara30">Lips CJ conceived and designed the study and was also responsible for the manuscript writing and preparation of figures and table&#46; Dreijerink KM searched the literature for important contents&#44; provided assistance to the manuscript writing and to the molecular aspects of the menin protein&#46; H&#246;ppener JW provided assistance to the study design&#44; manuscript writing and final version of the manuscript&#46;</p>"
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        "etiqueta" => "Figure 1"
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        "descripcion" => array:1 [
          "en" => "<p id="spara10" class="elsevierStyleSimplePara elsevierViewall">In MEN1 tumors&#44; inactivating mutations in the <span class="elsevierStyleItalic">MEN1</span> gene result in alterations of histone protein modifications&#58; both deacetylation &#40;left&#41; and trimethylation &#40;right&#41; are repressed&#46; In this way&#44; the normal function of menin acting as co-repressor and co-activator of gene transcription is disabled&#46; Consequently&#44; the normal function of menin &#40;preservation of differentiation of the cell by modification of histone proteins and transcription of genes responsible for inhibition of cell division&#41; is defective&#46; Red arrows indicate inhibition of apoptosis&#44; cell differentiation&#44; DNA repair&#44; and endocrine metabolic functions&#44; whereas stimulators of cell division are indicated in green&#46; Opportunities for tumor treatment are indicated in blue&#46; E2 &#61; estradiol&#59; TZDs &#61; thiazolidinediones&#59; VDR &#61; Vitamin D receptor&#46;</p>"
        ]
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      1 => array:7 [
        "identificador" => "fig2"
        "etiqueta" => "Figure 2"
        "tipo" => "MULTIMEDIAFIGURA"
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          "en" => "<p id="spara20" class="elsevierStyleSimplePara elsevierViewall">Beyond inactivation of the <span class="elsevierStyleItalic">MEN1</span> gene&#44; additional mutations in other genes may be responsible for acceleration of tumor growth&#44; thus involving a process of multistep tumorigenesis&#46; Deregulation of normal neuroendocrine development&#47;differentiation can occur through a range of processes&#44; e&#46;g&#46; activation of the PI3K pathway leads to AKT phosphorylation&#44; triggering a downstream cascade of events&#46; Deregulation of this pathway can occur through several mechanisms&#58; 1&#41; gain of function by oncogenic mutations of PIK3&#59; 2&#41; loss of function of the tumor suppressor PTEN through gene deletion&#44; mutation&#44; micro-RNA expression&#44; or epigenetic silencing&#59; 3&#41; amplification or mutation of AKT isoforms&#59; 4&#41; upstream activation through RTK signalling&#59; 5&#41; downstream loss of the tumor suppressors p18 and p27&#59; 6&#41; increased RAS expression&#44; or activating mutations of RAF&#44; MEK&#44; or ERK&#44; which accelerate cell proliferation&#46; Opportunities for treatment are in blue&#46; NSAIDs &#61; non-steroidal anti-inflammatory drugs&#59; RTK &#61; receptor tyrosine kinase&#59; TZDs &#61; thiazolidinediones&#46;</p>"
        ]
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        "etiqueta" => "Table 1"
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                  \t\t\t\t  " align="left" valign="top" scope="col">Protein&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="center" valign="top" scope="col">Function&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="center" valign="top" scope="col">Reference&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="top"><span class="elsevierStyleBold">A Chromatin modification proteins</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="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&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="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&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="top">HDAC1<a class="elsevierStyleCrossRef" href="#tfn1">&#8727;</a>&#41;&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="center" valign="top">Chromatin modification&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="center" valign="top">Kim et al&#46; &#40;<a class="elsevierStyleCrossRef" href="#bib18">18</a>&#41;&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="top">MLL&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="center" valign="top">Chromatin modification&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="center" valign="top">Yokoyama et al&#46; &#40;<a class="elsevierStyleCrossRef" href="#bib17">17</a>&#41;&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="top">MLL2&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="center" valign="top">Chromatin modification&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="center" valign="top">Hughes et al&#46; &#40;<a class="elsevierStyleCrossRef" href="#bib12">12</a>&#41;&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="top">mSin3A<a class="elsevierStyleCrossRef" href="#tfn1">&#8727;</a>&#41;&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="center" valign="top">Chromatin modification&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="center" valign="top">Kim et al&#46; &#40;<a class="elsevierStyleCrossRef" href="#bib18">18</a>&#41;&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="top">LEDGF&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="center" valign="top">Chromatin-associated&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="center" valign="top">Yokoyama et al&#46; &#40;<a class="elsevierStyleCrossRef" href="#bib20">20</a>&#41;&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="top"><span class="elsevierStyleBold">B Transcription factors</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="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&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="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&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="top">JunD&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="center" valign="top">Gene transcription&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="center" valign="top">Agarwal et al&#46; &#40;<a class="elsevierStyleCrossRef" href="#bib21">21</a>&#41;&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="top">NF-&#954;B&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="center" valign="top">Gene transcription&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="center" valign="top">Heppner et al&#46; &#40;<a class="elsevierStyleCrossRef" href="#bib22">22</a>&#41;&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="top">Pem&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="center" valign="top">Gene transcription&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="center" valign="top">Lemmens et al&#46; &#40;<a class="elsevierStyleCrossRef" href="#bib23">23</a>&#41;&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="top">Smad&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="center" valign="top">Gene transcription&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="center" valign="top">Kaji et al&#46; &#40;<a class="elsevierStyleCrossRef" href="#bib24">24</a>&#41;&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="top">TGF-&#946;&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="center" valign="top">Gene transcription&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="center" valign="top">Shattuck et al&#46; &#40;<a class="elsevierStyleCrossRef" href="#bib25">25</a>&#41;&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="top">WNT&#47;&#946;-catenin<a class="elsevierStyleCrossRef" href="#tfn1">&#8727;</a>&#41;&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="center" valign="top">Gene transcription&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="center" valign="top">Chen et al&#46; &#40;<a class="elsevierStyleCrossRef" href="#bib26">26</a>&#41;&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="top">ER&#945;&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="center" valign="top">Gene transcription&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="center" valign="top">Dreijerink et al&#46; &#40;<a class="elsevierStyleCrossRef" href="#bib27">27</a>&#41;&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="top">VDR&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="center" valign="top">Gene transcription&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="center" valign="top">Dreijerink et al&#46; &#40;<a class="elsevierStyleCrossRef" href="#bib27">27</a>&#41;&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="top">PPAR&#947;&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="center" valign="top">Gene transcription&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="center" valign="top">Dreijerink et al&#46; &#40;<a class="elsevierStyleCrossRef" href="#bib27">27</a>&#41;&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="top">FOXO1<a class="elsevierStyleCrossRef" href="#tfn1">&#8727;</a>&#41;&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="center" valign="top">Gene transcription&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="center" valign="top">Wuescher et al&#46; &#40;<a class="elsevierStyleCrossRef" href="#bib28">28</a>&#41;&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="top"><span class="elsevierStyleBold">C DNA repair proteins</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="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&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="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&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="top">RPA2&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="center" valign="top">DNA replication&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="center" valign="top">Sukhodolets et al&#46;&#40;<a class="elsevierStyleCrossRef" href="#bib29">29</a>&#41;&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="top">ASK&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="center" valign="top">Cell cycle regulation&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="center" valign="top">Schnepp et al&#46; &#40;<a class="elsevierStyleCrossRef" href="#bib30">30</a>&#41;&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="top">CHES1&#40;FOXN3&#41;&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="center" valign="top">DNA repair&#47; Transcription&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="center" valign="top">Busygina et al&#46; &#40;<a class="elsevierStyleCrossRef" href="#bib31">31</a>&#41;&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="top">FANCD2&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="center" valign="top">DNA repair&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="center" valign="top">Jin et al&#46; &#40;<a class="elsevierStyleCrossRef" href="#bib32">32</a>&#41;&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="top"><span class="elsevierStyleBold">D Cytoplasmic proteins</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="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&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="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&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="top">Vimentin&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="center" valign="top">Cytoplasmic&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="center" valign="top">Lopez-Egido et al&#46; &#40;<a class="elsevierStyleCrossRef" href="#bib33">33</a>&#41;&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="top">AKT1&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="center" valign="top">Signal transduction&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="center" valign="top">Wang et al&#46; &#40;<a class="elsevierStyleCrossRef" href="#bib34">34</a>&#41;&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="top">GFAP&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="center" valign="top">Cytoplasmic&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="center" valign="top">Lopez-Egido et al&#46; &#40;<a class="elsevierStyleCrossRef" href="#bib33">33</a>&#41;&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="top">NM23&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="center" valign="top">GTP-ase&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="center" valign="top">Ohkura et al&#46; &#40;<a class="elsevierStyleCrossRef" href="#bib35">35</a>&#41;&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="top">IQGAP1&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="center" valign="top">Cell adhesion&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="center" valign="top">Yan et al&#46; &#40;<a class="elsevierStyleCrossRef" href="#bib36">36</a>&#41;&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
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                  \t\t\t\t  " align="center" valign="top">Myosin&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="center" valign="top">Obungu et al&#46; &#40;<a class="elsevierStyleCrossRef" href="#bib37">37</a>&#41;&nbsp;\t\t\t\t\t\t\n
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Article information

ISSN: 18075932
Original language: English

DOI:10.6061/clinics/2012(Sup01)10

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