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Updated: May 19, 2026

Optimized Analysis of In Vivo and In Vitro Hepatic Steatosis
Published on: March 11, 2017
Ablation of gp78 in liver improves hyperlipidemia and insulin resistance by inhibiting SREBP to decrease lipid
Tong-Fei Liu1, Jing-Jie Tang, Pei-Shan Li
1The State Key Laboratory of Molecular Biology, Institute of Biochemistry and Cell Biology, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, 320 Yue-Yang Road, Shanghai 200031, China.
Deleting gp78 (a ubiquitin ligase) in the liver reduces lipid biosynthesis and improves metabolic health. This leads to decreased obesity and glucose intolerance, offering potential benefits for metabolic diseases.
Area of Science:
- Biochemistry
- Metabolic Diseases
- Molecular Biology
Background:
- gp78 is a ubiquitin ligase affecting cholesterol and lipid metabolism.
- It targets HMG-CoA reductase (HMGCR) and Insig-1, influencing lipid biosynthesis.
- gp78's role in liver lipid regulation and metabolic disease is not fully understood.
Purpose of the Study:
- To investigate the function of gp78 in liver lipid metabolism.
- To determine the effects of liver-specific gp78 ablation on metabolic parameters.
- To explore the therapeutic potential of targeting gp78 for metabolic diseases.
Main Methods:
- Generated liver-specific gp78 knockout (L-gp78(-/-)) mice.
- Analyzed HMGCR degradation, Insig-1/-2 levels, and SREBP activity.
- Assessed metabolic phenotypes including obesity, glucose intolerance, and FGF21 production.
Main Results:
- L-gp78(-/-) mice showed blunted HMGCR degradation but suppressed SREBP due to elevated Insig-1/-2.
- Lipid biosynthesis was decreased in L-gp78(-/-) mice.
- Mice were protected from diet-/age-induced obesity and glucose intolerance, with increased FGF21 production.
Conclusions:
- gp78 in the liver primarily regulates lipid biosynthesis via the SREBP pathway.
- Ablating gp78 reduces lipid levels and increases FGF21, improving metabolic health.
- Targeting gp78 may be beneficial for treating metabolic diseases.
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