Diverse routes to liver regeneration

Area of Science:

• Hepatology
• Regenerative Medicine
• Cell Biology

Background:

• The liver exhibits remarkable regenerative capacity, traditionally attributed to hepatocyte division.
• A potential stem cell compartment in the canals of Hering gives rise to hepatic progenitor cells (HPCs) during severe liver damage, but their functional role remains debated.

Purpose of the Study:

• To elucidate the distinct mechanisms of liver regeneration in mice under various physiological and pathological conditions.
• To clarify the roles of hepatocytes and hepatic progenitor cells (HPCs) in liver tissue repair.

Main Methods:

• Investigated liver regeneration following partial hepatectomy in mice.
• Analyzed cellular responses under homeostatic and chronic damage scenarios.
• Characterized the contribution of different cell populations to liver regrowth.

Main Results:

• Under homeostatic conditions, a perivenous population of clonogenic hepatocytes drives regeneration.
• During chronic damage, a distinct periportal population of clonogenic hepatocytes becomes active.
• Hepatic progenitor cells (HPCs) demonstrate the capacity for complete liver parenchyma replacement when other mechanisms fail.

Conclusions:

• The mouse liver employs versatile regenerative strategies involving both hepatocytes and hepatic progenitor cells (HPCs).
• The specific cell population responsible for regeneration is context-dependent, varying with the type and severity of liver injury.