Publications Scientifiques

[ Article ] Implication of human endogenous retrovirus envelope proteins in placental functions

Date de soumission: 07-02-2018
Année de Publication: 2014
Entité/Laboratoire Laboratoire de Recherche en Biologie Appliquée (LARBA)
Document type : Article
Discipline(s) : Immulogie & maladie infectueuse
Titre Implication of human endogenous retrovirus envelope proteins in placental functions
Auteurs Lokossou Adjimon Gatien [1], Toudic Caroline [2], Barbeau Benoit [3],
Journal: Viruse
Catégorie Journal: Internationale
Impact factor: 0
Volume Journal: 6
DOI: 10.3390/v6114609
Resume Human endogenous retroviruses (ERVs) represent 8% of the total human genome. Although the majority of these ancient proviral sequences have only retained non-coding long terminal repeats (LTRs), a number of "endogenized" retroviral genes encode functional proteins. Previous studies have underlined the implication of these ERV-derived proteins in the development and the function of the placenta. In this review, we summarize recent findings showing that two ERV genes, termed Syncytin-1 and Syncytin-2, which encode former envelope (Env) proteins, trigger fusion events between villous cytotrophoblasts and the peripheral multinucleated syncytiotrophoblast layer. Such fusion events maintain the stability of this latter cell structure, which plays an important role in fetal development by the active secretion of various soluble factors, gas exchange and regulation of fetomaternal immunotolerance. We also highlight new studies showing that these ERV proteins, in addition to their localization at the cell surface of cytotrophoblasts, are also incorporated on the surface of various extracellular microvesicles, including exosomes. Such exosome-associated proteins could be involved in the various functions attributed to these vesicles and could provide a form of tropism. Additionally, through their immunosuppressive domains, these ERV proteins could also contribute to fetomaternal immunotolerance in a local and more distal manner. These various aspects of the implication of Syncytin-1 and -2 in placental function are also addressed in the context of the placenta-related disorder, preeclampsia.
Mots clés human endogenous retrovirus, Syncytin-1 and -2, placenta, syncytiotrophoblast, immunotolerance, exosomes, pre-eclampsia
Pages 4609 - 4627
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