Regulation of insulin signaling in skeletal muscle by PIP3 phosphatase, SKIP, and endoplasmic reticulum molecular chaperone glucose-regulated protein 78

Takeshi Ijuin, Naoya Hatano, Tetsuya Hosooka, Tadaomi Takenawa

doi:10.1016/j.bbamcr.2015.09.009

Insulin resistance is characterized as a pathogenic factor in type 2 diabetes. Despite skeletal muscle being primarily responsible for systemic glucose disposal, the mechanisms underlying the induction of insulin resistance in skeletal muscle have not been fully elucidated. A number of studies have shown that it is characterized by the inhibition of the phosphatidylinositol (PI) 3-kinase signaling pathway. Here, we show that skeletal muscle- and kidney-enriched inositol polyphosphate phosphatase (SKIP), a phosphatidylinositol-3,4,5-trisphosphate (PIP3) phosphatase, and glucose-regulated protein 78 (GRP78) are implicated in the inhibition of insulin-dependent PI 3-kinase signaling in skeletal muscle. Mechanistically, under resting conditions, SKIP forms a complex with GRP78 at the endoplasmic reticulum (ER). Insulin stimulation facilitates the dissociation of SKIP from GRP78 and its binding to the activated form of Pak1. GRP78 is necessary for membrane localization and Pak1-binding of SKIP, which facilitates inactivation of the insulin signaling pathway. These findings underscore the specific and prominent role of SKIP and GRP78 in the regulation of insulin-dependent PI 3-kinase signaling in skeletal muscle.

Regulation of insulin signaling in skeletal muscle by PIP3 phosphatase, SKIP, and endoplasmic reticulum molecular chaperone glucose-regulated protein 78

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Regulation of insulin signaling in skeletal muscle by PIP3 phosphatase, SKIP, and endoplasmic reticulum molecular chaperone glucose-regulated protein 78

書誌事項

この論文をさがす

説明

収録刊行物

被引用文献 (2)*注記

参考文献 (31)*注記

関連プロジェクト

キーワード

詳細情報 詳細情報について

書き出し

問題の指摘

詳細情報詳細情報について