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Article Publish Status: FREE
Abstract Title:

Green Tea Polyphenols Ameliorate the Early Renal Damage Induced by a High-Fat Diet via Ketogenesis/SIRT3 Pathway.

Abstract Source:

Oxid Med Cell Longev. 2017 ;2017:9032792. Epub 2017 Jul 26. PMID: 28814987

Abstract Author(s):

Weijie Yi, Xiao Xie, Miying Du, Yongjun Bu, Nannan Wu, Hui Yang, Chong Tian, Fangyi Xu, Siyun Xiang, Piwei Zhang, Zhuo Chen, Xuezhi Zuo, Chenjiang Ying

Article Affiliation:

Weijie Yi

Abstract:

SCOPE: Several reports in the literature have suggested the renoprotective effects of ketone bodies and green tea polyphenols (GTPs). Our previous study found that GTP consumption could elevate the renal expression of the ketogenic rate-limiting enzyme, which was decreased by a high-fat diet (HFD) in rats. Here, we investigated whether ketogenesis can mediate renoprotection by GTPs against an HFD.

METHODS AND RESULTS: Wistar rats were fed a standard or HFD with or without GTPs for 18 weeks. The renal oxidative stress level, kidney function, renal expression, and activity levels of mitochondrial 3-hydroxy-3-methylglutaryl-CoA (HMG-CoA) synthase 2 (HMGCS2) and sirtuin 3(SIRT3) were detected. The increased renal oxidative stress and the loss of renal function induced by the HFD were ameliorated by GTPs. Renal ketogenesis and SIRT3 expression and activity levels, which were reduced by the HFD, were restored by GTPs. In vitro, HEK293 cells were transfected with the eukaryotic expression plasmid pcDNA HMGCS2. GTP treatment could upregulate HMGCS2 and SIRT3 expression. Although SIRT3 expression was not affected by HMGCS2 transfection, the 4-hydroxy-2-nonenal (4-HNE) level and the acetyl-MnSOD (K122)/MnSOD ratio were reduced in HMGCS2-transfected cells in the context of H2O2.

CONCLUSION: The ketogenesis/SIRT3 pathway mediates the renoprotection of GTPs against the oxidative stress induced by an HFD.

Study Type : Animal Study

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Sayer Ji
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