Reptin/RUVBL2 is required for hepatocyte proliferation in vivo, liver regeneration and homeostasis.

Liver international : official journal of the International Association for the Study of the Liver 2021 Jun

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Previous studies have shown that Reptin is overexpressed in hepatocellular carcinoma and that it is necessary for in vitro proliferation and cell survival. However, its pathophysiological role in vivo remains unknown. We aimed to study the role of Reptin in hepatocyte proliferation after regeneration using a liver Reptin knock-out model (ReptinLKO ). Interestingly, hepatocyte proliferation is strongly impaired in ReptinLKO mice 36 h after partial hepatectomy, associated with a decrease of cyclin-A expression and mTORC1 and MAPK signalling, leading to an impaired liver regeneration. Moreover, in the ReptinLKO model, we have observed a progressive loss of Reptin invalidation associated with an atypical liver regeneration. Hypertrophic and proliferative hepatocytes gradually replace ReptinKO hypotrophic hepatocytes. To conclude, our results show that Reptin is required for hepatocyte proliferation in vivo and liver regeneration and that it plays a crucial role in hepatocyte survival and liver homeostasis. © 2021 John Wiley & Sons A/S. Published by John Wiley & Sons Ltd.

Citation

Joaquim Javary, Nathalie Allain, Zakaria Ezzoukhry, Sylvaine Di Tommaso, Jean-William Dupuy, Pierre Costet, Nathalie Dugot-Senant, Frédéric Saltel, Violaine Moreau, Pierre Dubus, Samira Benhamouche-Trouillet. Reptin/RUVBL2 is required for hepatocyte proliferation in vivo, liver regeneration and homeostasis. Liver international : official journal of the International Association for the Study of the Liver. 2021 Jun;41(6):1423-1429