Camptothecin activates SIRT1 to promote lipid catabolism through AMPK/FoxO1/ATGL pathway in C2C12 myogenic cells

Mei-Chen Lo, Jia-Yin Chen, Yung-Ting Kuo, Wei-Lu Chen, Horng-Mo Lee, Shyang-Guang Wang

研究成果: 雜誌貢獻文章同行評審

3 引文 斯高帕斯(Scopus)

摘要

Caloric restriction activates sirtuin 1 (SIRT1) and induces a variety of metabolic effects that are beneficial for preventing age-related disease. The present study screened a commercially available used drug library to develop small molecule activators of SIRT1 as therapeutics for treatment of metabolic disorders. Using an in vitro fluorescence assay, the cancer therapeutic camptothecin increased SIRT1 enzymatic activity by 5.5-fold, indicating it to be a potent SIRT1 activator. Camptothecin also elevated the nicotinamide adenine dinucleotide (NAD)+/NADH ratio and increased SIRT1 protein levels in differentiated C2C12 myogenic cells. Treatment of C2C12 myotubes with camptothecin increased phosphorylation of AMP-dependent kinase (AMPK) and acetyl-coenzyme A carboxylase, caused nuclear translocation and deacetylation of forkhead box O1 (FoxO1), increased transcription and protein expression of adipose triglyceride lipase (ATGL), decreased the amount of intracellular oil droplets, and significantly increased β-oxidation of fatty acids. These in vitro data were confirmed in vivo as camptothecin treatment of C57BL/6J mice reduced fat and plasma triglyceride levels. All of the above camptothecin-induced alterations were attenuated by the SIRT1-specific inhibitor nicotinamide and/or 6-[4-(2-piperidin-1-ylethoxy) phenyl]-3-pyridin-4-ylpyrazolo [1,5-a]pyrimidin (compound C). Thus, camptothecin activation of SIRT1 promotes lipid catabolism through AMPK/FoxO1/ATGL signaling.
原文英語
頁(從 - 到)672-683
頁數12
期刊Archives of Pharmacal Research
42
發行號8
早期上線日期四月 24 2019
DOIs
出版狀態已發佈 - 八月 1 2019

ASJC Scopus subject areas

  • Molecular Medicine
  • Drug Discovery
  • Organic Chemistry

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