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High-fat diet-induced changes in liver thioredoxin and thioredoxin reductase as a novel feature of insulin resistance.


ABSTRACT: High-fat diet (HFD) can induce oxidative stress. Thioredoxin (Trx) and thioredoxin reductase (TrxR) are critical antioxidant proteins but how they are affected by HFD remains unclear. Using HFD-induced insulin-resistant mouse model, we show here that liver Trx and TrxR are significantly decreased, but, remarkably, the degree of their S-acylation is increased after consuming HFD. These HFD-induced changes in Trx/TrxR may reflect abnormalities of lipid metabolism and insulin signaling transduction. HFD-driven accumulation of 4-hydroxynonenal is another potential mechanism behind inactivation and decreased expression of Trx/TrxR. Thus, we propose HFD-induced impairment of liver Trx/TrxR as major contributor to oxidative stress and as a novel feature of insulin resistance.

SUBMITTER: Qin H 

PROVIDER: S-EPMC4239481 | biostudies-literature | 2014

REPOSITORIES: biostudies-literature

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High-fat diet-induced changes in liver thioredoxin and thioredoxin reductase as a novel feature of insulin resistance.

Qin Huijun H   Zhang Xiaolin X   Ye Fei F   Zhong Liangwei L  

FEBS open bio 20141031


High-fat diet (HFD) can induce oxidative stress. Thioredoxin (Trx) and thioredoxin reductase (TrxR) are critical antioxidant proteins but how they are affected by HFD remains unclear. Using HFD-induced insulin-resistant mouse model, we show here that liver Trx and TrxR are significantly decreased, but, remarkably, the degree of their S-acylation is increased after consuming HFD. These HFD-induced changes in Trx/TrxR may reflect abnormalities of lipid metabolism and insulin signaling transduction  ...[more]

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