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Updated: Oct 12, 2025
08:35
A Model of Experimental Steatosis In Vitro: Hepatocyte Cell Culture in Lipid Overload-Conditioned Medium
Published on: May 18, 2021
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Ochratoxin A Induces Steatosis via PPARγ-CD36 Axis
Qian-Wen Zheng1,2, Xu-Fen Ding1, Hui-Jun Cao1
1CAS Key Laboratory of Nutrition, Metabolism and Food Safety, Shanghai Institute of Nutrition and Health, University of Chinese Academy of Sciences, Chinese Academy of Sciences, Shanghai 200031, China.
Toxins
|November 25, 2021
Summary
Ochratoxin A (OTA) exposure promotes liver fat accumulation by preventing PPARγ degradation, leading to hepatic steatosis. This suggests OTA contributes to metabolic diseases through the PPARγ-CD36 pathway.
Area of Science:
- Toxicology
- Hepatology
- Metabolic Diseases
Background:
- Ochratoxin A (OTA) is a prevalent food and feed contaminant with the liver as a key target organ.
- Nonalcoholic fatty liver disease (NAFLD) is the most common liver disease, driven by modern lifestyle and diet.
Purpose of the Study:
- To investigate the effect of OTA on hepatic lipid metabolism.
- To explore the potential role of OTA in the development of NAFLD.
Main Methods:
- C57BL/6 male mice were administered 1 mg/kg OTA daily via gavage.
- In vitro studies utilized primary hepatocytes and HepG2 cells treated with OTA.
- Mechanisms investigated involved PPARγ degradation, E3 ligase SIAH2 interaction, and CD36 expression.
Main Results:
- OTA significantly increased lipid deposition and triglyceride (TG) accumulation in mouse livers.
- OTA promoted lipid droplet accumulation in primary hepatocytes and HepG2 cells.
- OTA prevented PPARγ degradation by inhibiting the PPARγ-SIAH2 interaction, activating the PPARγ signaling pathway. Downregulation of CD36 alleviated OTA-induced lipid accumulation.
Conclusions:
- OTA induces hepatic steatosis through the PPARγ-CD36 signaling axis.
- OTA impacts liver lipid metabolism and may contribute to metabolic disease development.
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