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• W2156889128 abstract "Myofibrillar protein loss occurring in catabolic situations is considered to be mediated by the release of proinflammatory cytokines and associated with a decrease in circulating and muscle levels of insulin-like growth factor I (IGF-I). In this paper, we investigated whether the C(2)C(12) myotube atrophy caused in vitro by TNF-alpha/IFN-gamma cytokines might be reversed by exogenous IGF-I. Our results showed that, despite the presence of TNF-alpha/IFN-gamma, IGF-I retained its full ability to induce the phosphorylation of Akt, Foxo3a, and GSK-3beta (respectively, 16-fold, 9-fold, and 2-fold) together with a decrease in atrogin-1 mRNA (-39%, P < 0.001). Although this ubiquitin ligase has been reported to accelerate the degradation of MyoD, a myogenic transcription factor driving the transcription of myosin heavy chain (MHC), IGF-I failed to blunt the reduction of MyoD and MHC caused by TNF-alpha/IFN-gamma. Moreover, IGF-I only very slightly attenuated the myotube atrophy induced by TNF-alpha/IFN-gamma (TNF-alpha/IFN-gamma 15.48 mum alone vs. TNF-alpha/IFN-gamma/IGF-I 16.97 mum, P < 0.001). In conclusion, our data show that IGF-I does not reverse the myotube atrophy induced by TNF-alpha/IFN-gamma despite the phosphorylation of Foxo and GSK-3beta and the downregulation of atrogin-1 mRNA. Our study suggests therefore that factors other than IGF-I decrease are responsible for the muscle atrophy caused by proinflammatory cytokines." @default.
• W2156889128 created "2016-06-24" @default.
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• W2156889128 date "2007-01-01" @default.
• W2156889128 modified "2023-09-23" @default.
• W2156889128 title "IGF-I does not prevent myotube atrophy caused by proinflammatory cytokines despite activation of Akt/Foxo and GSK-3β pathways and inhibition of atrogin-1 mRNA" @default.
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• W2156889128 doi "https://doi.org/10.1152/ajpendo.00085.2006" @default.
• W2156889128 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/16926385" @default.
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