Review Article

Cellular Mechanisms of Liver Regeneration and Cell-Based Therapies of Liver Diseases

Table 1

Role of various cells in liver regeneration.

Type of cellsAnimal modelExamples of similar human disease or stateCellular mechanisms involved

Differentiated hepatocytesHomeostatic regeneration, partial hepatectomy (rat, mouse), choline-deficient, ethionine-supplemented (CDE) diet (mouse), chronic CCl4 (mouse), diethyldithiocarbamate- (DDC-) induced liver damage (mouse), α-naphthylisothiocyanate- (ANIT-) induced liver damage (mouse)Homeostatic regeneration, partial liver resection (cancer, bleeding after mechanical trauma, etc.), organ mass restoration after partial liver transplantation, liver fibrosis and cirrhosis, acute or chronic liver failureHypertrophy followed by hyperplasia and differentiation into hepatocytes or transdifferentiation into cholangiocytes; debated if all or a subpopulation (e.g., hybrid periportal hepatocytes) of hepatocytes participate

LSPCsLiver poisoning by dipin, retrorsine, galactosamine (rat, mouse), CDE diet (mouse), chronic CCl4 (mouse), DDC-induced liver damage (mouse), ANIT-induced liver damage (mouse), and so forthAcute or chronic liver failure, including liver tissue necrosis after poisoning or partial liver transplantationExpansion and differentiation into hepatocytes, cholangiocytes, and probably other liver cell types; debated if this mechanism of liver regeneration exists

Blood-borne HSCsHepatocyte proliferation blockade combined with liver injury to induce oval cell proliferation after cross-sex bone marrow transplantation (rat, mouse, pig)Any disease or state; liver transplantationTransdifferentiation into hepatocytes; after liver transplantation transdifferentiated HSCs substitute donor hepatocytes; debated what subpopulation of HSCs (“endodermal progenitors,” multipotent precursors) participate; dusion with resident hepatocytes (?)

Blood-borne MSCsTransplantation of human MSCs into immunodeficient partially hepatectomized immunodeficient mice, hepatocyte proliferation blockade combined with liver injury to induce oval cell proliferation after cross-sex bone marrow transplantation (rat, mouse, pig)Any disease or state; liver transplantationTransdifferentiation into hepatocytes and other liver cell types; after liver transplantation transdifferentiated MSCs substitute donor hepatocytes; debated what subpopulation of MSCs (Muse cells or others) participate; fusion with resident hepatocytes (?)