Plastic hepatocyte states limit liver cancer development

Area of Science:

• Hepatology
• Cell Biology
• Regenerative Medicine

Background:

• The liver possesses significant regenerative capacity driven by hepatocytes.
• Balancing regeneration with mechanisms to prevent overgrowth and tumorigenesis is crucial during liver injury.
• Epithelial plasticity in hepatocytes is observed during liver damage, potentially mediating cell fate decisions.

Purpose of the Study:

• To investigate the role of hepatocyte plasticity in liver regeneration and disease.
• To determine if plastic hepatocytes contribute to hepatocyte reprogramming or biliary epithelial cell (BEC) conversion.
• To understand how plastic states influence hepatocyte proliferation and tumorigenesis.

Main Methods:

• Development of in vivo tools to trap mouse hepatocytes in plastic states.
• Utilizing mouse models of liver regeneration.
• Employing liver transplantation models.

Main Results:

• Hepatocytes in plastic states are prevalent in liver injury contexts.
• Plastic hepatocytes represent a predominant outcome of hepatocyte reprogramming, not full BEC conversion.
• Plastic hepatocytes are refractory to microenvironmental proliferation cues and resist proliferation from oncogenic stimuli.

Conclusions:

• Acquisition of plastic states by hepatocytes is a protective mechanism.
• This plasticity constrains hepatocyte proliferation, preventing overgrowth.
• Plasticity limits tumorigenesis during liver disease.