alexa Activation of SOCS-3 by resistin.
Microbiology

Microbiology

Journal of Microbial & Biochemical Technology

Author(s): Steppan CM, Wang J, Whiteman EL, Birnbaum MJ, Lazar MA

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Abstract Resistin is an adipocyte hormone that modulates glucose homeostasis. Here we show that in 3T3-L1 adipocytes, resistin attenuates multiple effects of insulin, including insulin receptor (IR) phosphorylation, IR substrate 1 (IRS-1) phosphorylation, phosphatidylinositol-3-kinase (PI3K) activation, phosphatidylinositol triphosphate production, and activation of protein kinase B/Akt. Remarkably, resistin treatment markedly induces the gene expression of suppressor of cytokine signaling 3 (SOCS-3), a known inhibitor of insulin signaling. The 50\% effective dose for resistin induction of SOCS-3 is approximately 20 ng/ml, close to levels of resistin in serum. Association of SOCS-3 protein with the IR is also increased by resistin. Inhibition of SOCS function prevented resistin from antagonizing insulin action in adipocytes. SOCS-3 induction is the first cellular effect of resistin that is independent of insulin and is a likely mediator of resistin's inhibitory effect on insulin signaling in adipocytes.
This article was published in Mol Cell Biol and referenced in Journal of Microbial & Biochemical Technology

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