C1-Ten Is a Protein Tyrosine Phosphatase of Insulin Receptor Substrate 1 (IRS-1), Regulating IRS-1 Stability and Muscle Atrophy

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C1-Ten is a protein tyrosine phosphatase of insulin receptor substrate 1 (IRS-1), regulating IRS-1 stability and muscle atrophy.

Muscle atrophy occurs under various catabolic conditions, including insulin deficiency, insulin resistance, or increased levels of glucocorticoids. This results from reduced levels of insulin receptor substrate 1 (IRS-1), leading to decreased phosphatidylinositol 3-kinase activity and thereby activation of FoxO transcription factors. However, the precise mechanism of reduced IRS-1 under a catab...

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Insulin receptor substrate-1 (IRS-1) expression in rat brain.

IRS-1 is phosphorylated on tyrosine residues after insulin stimulation and participates in the early events of signal transduction in peripheral insulin-sensitive tissues. This study determined whether neuronal populations in the rat olfactory bulb and hippocampus (brain regions which have very high concentrations of insulin receptors) also express IRS-1 and contain phosphotyrosine, using in si...

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[The expression of the insulin receptor substrate-1 (IRS-1) and analysis of its mechanism].

IRS-1 (insulin receptor substrate-1) is a major substrate for the insulin receptor tyrosine kinase. After phosphorylation by the insulin receptor, IRS-1 binds to the specific molecules which possess SH2 (src homology 2) domain such as 85 kDa subunit of phosphatidylinositol 3 kinase and may mediate insulin signals. The regulation of IRS-1 has been analyzed in animal models of insulin resistance,...

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To test the hypothesis that glucocorticoid-induced insulin resistance might originate from abnormalities in insulin receptor signaling, we investigated the effects of glucocorticoids on in vivo tyrosine phosphorylation of the insulin receptor and the insulin receptor substrate IRS-1 in rat skeletal muscle. Male Sprague-Dawley rats were treated with cortisone (100 mg/kg for 5 d) and compared to ...

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ژورنال

عنوان ژورنال: Molecular and Cellular Biology

سال: 2013

ISSN: 0270-7306

DOI: 10.1128/mcb.01447-12