Abstract
The global prevalence and incidence of non-alcoholic fatty liver disease (NAFLD) are exhibiting an increasing trend. NAFLD is characterized by a significant accumulation of lipids, though its underlying mechanism is still unknown. Here we report that high-fat diet (HFD) feeding induced hepatic steatosis in mice, which was accompanied by a reduction in the expression and function of hepatic TRPV2. Moreover, conditional knockout of TRPV2 in hepatocytes exacerbated HFD-induced hepatic steatosis. In an in vitro model of NAFLD, TRPV2 regulated lipid accumulation in HepG2 cells, and TRPV2 activation inhibited the expression of the cellular senescence markers p21 and p16, all of which were mediated by AMPK phosphorylation. Finally, we found that administration of probenecid, a TRPV2 agonist, impaired HFD-induced hepatic steatosis and suppressed HFD-induced elevation in p21 and p16. Collectively, our findings imply that hepatic TRPV2 protects against the accumulation of lipids by modulating p21 signalling.
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Data Availability
The data that support the findings of this study are available from the corresponding authors upon reasonable request.
Abbreviations
- NAFLD:
-
Non-alcoholic fatty liver disease
- HFD:
-
High-fat diet
- TRPV2:
-
Transient receptor potential vanilloid 2
- NASH:
-
Nonalcoholic steatohepatitis
- CDK:
-
Cyclin/cyclin-dependent kinase
- TRP:
-
Transient Receptor Potential
- NW:
-
Normal water
- RT:
-
Room temperature
- TG:
-
Triacyl glyceride
- PBS:
-
Phosphate-buffered saline
- HRP:
-
Horseradish peroxidase
- 2-APB:
-
2-Aminoethoxydiphenyl borate
- SKF:
-
SKF 96365 hydrochloride
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Funding
This work was supported by the National Natural Science Foundation of China (Grant: 81900517), Shenzhen Science and Technology Program (Grant: JCYJ20190808151805516), and Natural Science Foundation of Shenzhen University General Hospital (Grants: SUGH2019QD015 and SUGH2018QD008).
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JG and QL designed the experiments; PW, LL, and CR performed the experiments; MJ, HZ, KY, YW, HH, and MJ assisted with the experiments; LL and CR analysed the data; JG wrote the manuscript; and QL revised the manuscript. All authors have read and agreed to the published version of the manuscript. The authors declare that all data were generated in-house and that no paper mill was used.
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All animal procedures were approved by the Animal Care and Use Committee of the Health Science Center at Shenzhen University and complied with the relevant ethical guidelines (12W-2ACW-22–008).
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Key points
• HFD-induced hepatic steatosis is accompanied by a reduction in TRPV2 expression.
• TRPV2 activation inhibits HFD-induced lipid accumulation and impairs hepatic steatosis.
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Wei, P., Li, L., Ran, C. et al. High fat diet-induced downregulation of TRPV2 mediates hepatic steatosis via p21 signalling. J Physiol Biochem 80, 113–126 (2024). https://doi.org/10.1007/s13105-023-00988-8
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DOI: https://doi.org/10.1007/s13105-023-00988-8