Abstract

In severely or chronically injured livers where the proliferative capacity of hepatocytes is compromised, putative stem/progenitor cells are supposed to be activated. These cells are generally characterized as biliary epithelial cell marker-positive cells that emerge ectopically in the parenchymal region of the liver, as determined by histopathological examination of various liver diseases in humans and animal models. Whereas the biliary system indeed harbors cells with stem/progenitor activity that can be defined ex vivo, genetic lineage tracing studies in mice have casted doubt on their exact contribution as the genuine stem/progenitor cell population that differentiates in situ into hepatocytes. Here, I briefly review recentadvances in the characterization and certification of the stem/progenitor cells in the adult liver and discuss the ongoing and future challenges to further our understanding of the cellular basis of liver regeneration. (Hepatology 2016;64:663-668).

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