Flavanol-rich lychee fruit extract alleviates diet-induced insulin resistance via suppressing mTOR/SREBP-1 mediated lipogenesis in liver and restoring insulin signaling in skeletal muscle

Hung Wen Liu, Chu Chun Wei, Yen Ju Chen, Yun An Chen, Sue Joan Chang

研究成果: 雜誌貢獻期刊論文同行評審

30 引文 斯高帕斯(Scopus)

摘要

SCOPE: An elevated intracellular lipid contents resulted from lipid oversupply links obesity to insulin resistance. Flavanol-rich lychee fruit extract, oligonol, exhibited anti-obesity property in vitro and in vivo; however, the effects of oligonol on peripheral lipid metabolism and insulin sensitivity have not been fully investigated. We hypothesized that oligonol alleviated insulin resistance via decreasing intracellular lipid contents in peripheral tissues.

METHODS AND RESULTS: Dietary oligonol supplementation (20 or 200 mg/kg bw) reduced glucose and insulin levels, improved oral glucose tolerance, and suppressed inflammatory markers, MCP-1 and IL-6, in High-Fat diet (HFD) induced obese mice. Marked decreases in subcutaneous and visceral fat area, adipocyte size, and adipocyte released hormones including leptin and resistin by high-dose oligonol treatment were associated with downregulation of PPARγ gene expression. Significantly reduced intrahepatocellular lipid contents and hepatic triglyceride levels by oligonol (both doses) were associated with downregulation of mTOR/SREBP-1-mediated de novo lipogenesis. In skeletal muscle, oligonol enhanced Sirtuin1 protein expression and AMPKα activation, consequently resulted in reductions of intramuscular lipid contents and triglyceride levels and restoration of IRS-1 and AS160 phosphorylation.

CONCLUSION: Oligonol reduced intracellular lipid contents in liver and skeletal muscle and suppressed inflammatory markers, thereby alleviating HFD-induced insulin resistance.

原文英語
頁(從 - 到)2288-2296
頁數9
期刊Die Nahrung
60
發行號10
DOIs
出版狀態已發佈 - 2016 10月 1
對外發佈

ASJC Scopus subject areas

  • 生物技術
  • 食品科學

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