Restoring a gene regulator reduced liver fat in aged mice
Experiments in young and aged mice identified a liver protein whose restoration reduced fat buildup but did not consistently reverse inflammation-related gene activity.
Our read
Mechanisms- Studied:
- Preprint: experiments in mice
- In the record:
- One of 33 papers on HNF4A on record: 1 with results in people, 4 in animals.
Editor of record: Boris Djordjevic · AgingResearch.News
Young and aged mice were studied in experiments testing HNF4, a protein that controls gene activity in hepatocytes, the liver’s main cells. HNF4 production remained stable with age, but its binding to DNA and control of gene activity declined. Aged livers also accumulated fat and showed disrupted metabolic gene activity and increased inflammatory activity.
Deleting the gene for HNF4 specifically in hepatocytes reproduced key features of liver aging in young mice. It worsened fat buildup, inflammation and liver dysfunction in aged mice. Restoring HNF4 specifically in hepatocytes of aged mice reduced liver fat and restored gene programs for processing fatty acids, components of fats. It also partly reversed age-associated changes in gene activity. However, inflammation-related gene programs did not consistently reverse.
Why it matters
Aging raises the risk of metabolic dysfunction-associated steatotic liver disease, which involves fat buildup in the liver. The authors propose HNF4 as a potential target for preserving liver cells’ metabolic function with age.
Caveats
The findings came from mouse experiments, not tests in people. The preprint has not been peer-reviewed.
The paper
Sanford Burnham Prebys Medical Discovery Institute
bioRxiv, Nov 9, 2026, Open access, CC BY, Preprint, not yet peer-reviewed
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