{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,23]],"date-time":"2026-09-23T02:01:05Z","timestamp":1790128865159,"version":"4.0.1"},"reference-count":67,"publisher":"MDPI AG","issue":"3","license":[{"start":{"date-parts":[[2022,1,29]],"date-time":"2022-01-29T00:00:00Z","timestamp":1643414400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/100009326","name":"Cancer Research Society","doi-asserted-by":"publisher","award":["24004"],"award-info":[{"award-number":["24004"]}],"id":[{"id":"10.13039\/100009326","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["IJMS"],"abstract":"<jats:p>Uveal melanoma (UM) remains the most common intraocular malignancy among diseases affecting the adult eye. The primary tumor disseminates to the liver in half of patients and leads to a 6 to 12-month survival rate, making UM a particularly aggressive type of cancer. Genomic analyses have led to the development of gene-expression profiles that can efficiently predict metastatic progression. Among these genes, that encoding the serotonin receptor 2B (HTR2B) represents the most discriminant from this molecular signature, its aberrant expression being the hallmark of UM metastatic progression. Recent evidence suggests that expression of HTR2B might be regulated through the Janus kinase\/Signal Transducer and Activator of Transcription proteins (JAK\/STAT) intracellular signalization pathway. However, little is actually known about the molecular mechanisms involved in the abnormally elevated expression of the HTR2B gene in metastatic UM and whether activated STAT proteins participates to this mechanism. In this study, we determined the pattern of STAT family members expressed in both primary tumors and UM cell-lines, and evaluated their contribution to HTR2B gene expression. Examination of the HTR2B promoter sequence revealed the presence of a STAT putative target site (5\u2032-TTC (N)3 GAA3\u2032) located 280 bp upstream of the mRNA start site that is completely identical to the high affinity binding site recognized by these TFs. Gene profiling on microarrays provided evidence that metastatic UM cell lines with high levels of HTR2B also express high levels of STAT proteins whereas low levels of these TFs are observed in non-metastatic UM cells with low levels of HTR2B, suggesting that STAT proteins contribute to HTR2B gene expression in UM cells. All UM cell lines tested were found to express their own pattern of STAT proteins in Western blot analyses. Furthermore, T142 and T143 UM cells responded to interleukins IL-4 and IL-6 by increasing the phosphorylation status of STAT1. Most of all, expression of HTR2B also considerably increased in response to both IL-4 and IL-6 therefore providing evidence that HTR2B gene expression is modulated by STAT proteins in UM cells. The binding of STAT proteins to the \u2212280 HTR2B\/STAT site was also demonstrated by electrophoretic mobility shift assay (EMSA) analyses and site-directed mutation of that STAT site also abolished both IL-4 and IL-6 responsiveness in in vitro transfection analyses. The results of this study therefore demonstrate that members from the STAT family of TFs positively contribute to the expression of HTR2B in uveal melanoma.<\/jats:p>","DOI":"10.3390\/ijms23031564","type":"journal-article","created":{"date-parts":[[2022,1,29]],"date-time":"2022-01-29T23:02:06Z","timestamp":1643497326000},"page":"1564","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":13,"title":["Contribution of the STAT Family of Transcription Factors to the Expression of the Serotonin 2B (HTR2B) Receptor in Human Uveal Melanoma"],"prefix":"10.3390","volume":"23","author":[{"given":"Manel","family":"Benhassine","sequence":"first","affiliation":[{"name":"Centre Universitaire d\u2019Ophtalmologie-Recherche (CUO-Recherche), Axe M\u00e9decine R\u00e9g\u00e9n\u00e9ratrice, H\u00f4pital du Saint-Sacrement, Centre de Recherche FRQS du CHU de Qu\u00e9bec, Quebec City, QC G1S4L8, Canada"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ga\u00ebtan","family":"Le-Bel","sequence":"additional","affiliation":[{"name":"Centre Universitaire d\u2019Ophtalmologie-Recherche (CUO-Recherche), Axe M\u00e9decine R\u00e9g\u00e9n\u00e9ratrice, H\u00f4pital du Saint-Sacrement, Centre de Recherche FRQS du CHU de Qu\u00e9bec, Quebec City, QC G1S4L8, Canada"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6767-5833","authenticated-orcid":false,"given":"Sylvain L.","family":"Gu\u00e9rin","sequence":"additional","affiliation":[{"name":"Centre Universitaire d\u2019Ophtalmologie-Recherche (CUO-Recherche), Axe M\u00e9decine R\u00e9g\u00e9n\u00e9ratrice, H\u00f4pital du Saint-Sacrement, Centre de Recherche FRQS du CHU de Qu\u00e9bec, Quebec City, QC G1S4L8, Canada"},{"name":"D\u00e9partement d\u2019Ophtalmologie, Facult\u00e9 de M\u00e9decine, Universit\u00e9 Laval, Quebec City, QC G1V0A6, Canada"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2022,1,29]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"1758834018757175","DOI":"10.1177\/1758834018757175","article-title":"Treatment of uveal melanoma: Where are we now?","volume":"10","author":"Yang","year":"2018","journal-title":"Ther. 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