Hepatocellular senescence induces multi-organ senescence and dysfunction via TGFβ

Area of Science:

• Cellular biology
• Organ physiology
• Pathology

Background:

• Cellular senescence, a state of irreversible cell cycle arrest, is linked to aging and tissue repair.
• Senescent cells secrete factors that influence their microenvironment, potentially spreading senescence.
• Acute liver disease can lead to hepatocyte senescence and multi-organ failure, with mechanisms poorly understood.

Purpose of the Study:

• To investigate the systemic spread of senescence from the liver to extrahepatic organs.
• To determine the role of hepatocellular senescence in predicting outcomes in severe acute liver failure.
• To identify mechanisms mediating the systemic spread of senescence and explore therapeutic interventions.

Main Methods:

• Utilized liver injury and genetic models of hepatocyte-specific senescence.
• Analyzed senescence development in extrahepatic organs and associated organ dysfunction.
• Correlated hepatocellular senescence extent with disease outcome, transplantation need, and extrahepatic organ failure in patients.
• Investigated the TGFβ pathway's role in senescence transmission.

Main Results:

• Demonstrated senescence development in extrahepatic organs following liver senescence.
• Showed that hepatocellular senescence extent predicts outcomes in severe acute liver failure patients.
• Identified the TGFβ pathway as a key mediator of systemic senescence spread.
• Confirmed that TGFβ inhibition prevents senescence transmission and liver senescence-induced renal dysfunction.

Conclusions:

• Organ-specific senescence, particularly in the liver, can lead to systemic consequences and multi-organ dysfunction, independent of aging.
• The TGFβ pathway is a critical target for preventing the systemic spread of senescence.
• Targeting senescence transmission may offer novel therapeutic strategies for acute liver failure and associated complications.