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Updated: Sep 25, 2025

A High-Throughput In Situ Method for Estimation of Hepatocyte Nuclear Ploidy in Mice
Published on: April 19, 2020
Gene repression through epigenetic modulation by PPARA enhances hepatocellular proliferation
Daisuke Aibara1,2, Shogo Takahashi1,3, Tomoki Yagai1
1Laboratory of Metabolism, Center for Cancer Research, National Cancer Institute, National Institutes of Health, Bethesda, MD 20892, USA.
Peroxisome proliferator-activated receptor alpha (PPARA) activation drives liver cell growth by epigenetically repressing CDH1. This involves the PPARA-E2F8-UHRF1 pathway, revealing a novel mechanism for controlling hepatocyte proliferation.
Area of Science:
- Molecular Biology
- Epigenetics
- Hepatology
Background:
- Peroxisome proliferator-activated receptor alpha (PPARA) is crucial for lipid metabolism and inflammation.
- PPARA activation in rodents induces hepatocyte proliferation, but the mechanism remains unclear.
Purpose of the Study:
- To investigate the genes repressed by PPARA.
- To elucidate the mechanism by which PPARA promotes hepatocyte proliferation.
Main Methods:
- Analyzed PPARA-repressed genes in mice treated with PPARA agonists.
- Investigated the role of E2F8 and UHRF1 in PPARA-mediated gene regulation.
- Assessed the impact of CDH1 repression on Wnt signaling and hepatocyte proliferation.
Main Results:
- PPARA activation autoregulated its expression and induced UHRF1 via the target gene E2F8.
- UHRF1 repressed CDH1 expression through promoter methylation (H3K9me3).
- CDH1 repression was reversed by PPARA deficiency or E2F8/UHRF1 knockdown; forced CDH1 expression inhibited Wnt targets and hepatocyte proliferation.
Conclusions:
- The PPARA-E2F8-UHRF1-CDH1 axis mediates epigenetic regulation of hepatocyte proliferation.
- This pathway provides a novel mechanism for controlling liver cell growth.
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