title: Regenerating the liver: not so simple after all?
abstract: Under normal homeostatic conditions, hepatocyte renewal is a slow process and complete turnover likely takes at least a year. Studies of hepatocyte regeneration after a two-thirds partial hepatectomy (2/3 PH) have strongly suggested that periportal hepatocytes are the driving force behind regenerative re-population, but recent murine studies have brought greater complexity to the issue. Although periportal hepatocytes are still considered pre-eminent in the response to 2/3 PH, new studies suggest that normal homeostatic renewal is driven by pericentral hepatocytes under the control of Wnts, while pericentral injury provokes the clonal expansion of a subpopulation of periportal hepatocytes expressing low levels of biliary duct genes such as Sox9 and osteopontin. Furthermore, some clarity has been given to the debate on the ability of biliary-derived hepatic progenitor cells to generate physiologically meaningful numbers of hepatocytes in injury models, demonstrating that under appropriate circumstances these cells can re-populate the whole liver.
authors: Centre for Tumour Biology, Barts and The London School of Medicine and Dentistry, London, UK.
authors: Malcolm R
authors: MR
authors: Alison
authors: Department of Gastroenterology and Hepatology, Linkou Chang Gung Memorial Hospital, Taoyuan 333, Taiwan; Department of Medicine, Chang Gung University, Taoyuan 333, Taiwan.
authors: Wey-Ran
authors: WR
authors: Lin
keywords: hepatocyte regeneration; hepatocyte renewal; liver regeneration; pericentral hepatocytes; periportal hepatocytes