Resveratrol prevents TNF-α-induced muscle atrophy via regulation of Akt/mTOR/FoxO1 signaling in C2C12 myotubes

Feb 19, 2014International immunopharmacology

Resveratrol stops muscle loss caused by TNF-alpha by controlling key growth and breakdown signals in muscle cells

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Abstract

Resveratrol supplementation effectively counteracts TNF-α induced muscle protein loss.

TNF-α treatment leads to increased expression of muscle-specific proteins associated with muscle atrophy.
These changes are linked to a decrease in anabolic signaling pathways and an increase in catabolic factors.
Resveratrol supplementation reverses the decline of key anabolic targets and inhibits the expression of certain proteins related to muscle wasting.
FoxO3a expression is not influenced by resveratrol despite its effects on other signaling pathways.
Findings suggest that resveratrol may help improve muscle mass affected by inflammatory conditions.

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Muscle atrophy poses a serious concern to patients inflicted with inflammatory diseases. There is now increasing evidence which suggests a vital role for tumor necrosis factor alpha (TNF-α) in muscle pathology associated with impairment of differentiation and muscle wasting. Resveratrol has been an ascribed inhibitory effect on glucocorticoid-induced muscle atrophy in vitro, but the influence of resveratrol on the growth of C2C12 myotubes exposed to TNF-α remains unclear. The present study aimed to investigate the involvement of TNF-α in the regulation of skeletal muscle hypertrophy and atrophy, and the possibility to interfere with such modulations by means of resveratrol supplementation. For this purpose, C2C12 myotubes were treated with TNF-α in the presence or absence of resveratrol. Myotube treatment with TNF-α contributes to both hyperexpression of the muscle-specific ubiquitin ligase MAFbx and MuRF1, and these alterations are linked to a decrease of anabolic targets (Akt, mTOR, p70S6k and 4E-BP1) and an increase of catabolic targets (FoxO1, FoxO3a, MAFbx and MuRF1). Resveratrol supplementation effectively counteracts TNF-α induced muscle protein loss and reverses declining expression of Akt, mTOR, p70S6K, 4E-BP1and FoxO1, but exerts no influence of FoxO3a expression. Our study demonstrates that resveratrol can reverse the muscle cell atrophy caused by TNF-α through regulation of the Akt/mTOR/FoxO1 signaling pathways, followed by inhibition of the atrophy-related ubiquitin ligase. Our findings suggested that resveratrol could represent a possible strategy to improve muscle mass.

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Resveratrol prevents TNF-α-induced muscle atrophy via regulation of Akt/mTOR/FoxO1 signaling in C2C12 myotubes

Abstract

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