1-Phosphatidylinositol 3-kinase activity is required for insulin-stimulated glucose transport but not for RAS activation in CHO cells.

• K Hara

  Second Department of Internal Medicine, Kobe University School of Medicine, Japan.

• K Yonezawa

  Second Department of Internal Medicine, Kobe University School of Medicine, Japan.

• H Sakaue

  Second Department of Internal Medicine, Kobe University School of Medicine, Japan.

• A Ando

  Second Department of Internal Medicine, Kobe University School of Medicine, Japan.

• K Kotani

  Second Department of Internal Medicine, Kobe University School of Medicine, Japan.

• T Kitamura

  Second Department of Internal Medicine, Kobe University School of Medicine, Japan.

• Y Kitamura

  Second Department of Internal Medicine, Kobe University School of Medicine, Japan.

• H Ueda

  Second Department of Internal Medicine, Kobe University School of Medicine, Japan.

• L Stephens

  Second Department of Internal Medicine, Kobe University School of Medicine, Japan.

• T R Jackson

  Second Department of Internal Medicine, Kobe University School of Medicine, Japan.

抄録

Insulin stimulation drives the formation of a complex between tyrosine-phosphorylated insulin receptor substrate 1 (IRS-1) and 1-phosphatidylinositol 3-kinase (PI 3-kinase; ATP:1-phosphatidyl-1D-myo-inositol 3-phosphotransferase, EC 2.7.1.137), a heterodimer consisting of regulatory 85-kDa (p85) and catalytic 110-kDa (p110) subunits. This interaction takes place via the phosphorylated YMXM motifs of IRS-1 and the Src homology region 2 (SH2) domains of p85. In this study, the stable overexpression in a Chinese hamster ovary (CHO) cell line of a mutant p85 alpha (delta p85) protein, which lacks a binding site for p110, disrupted the complex formation between IRS-1 and the catalytic subunit of PI 3-kinase in intact cells during insulin stimulation. Activation of insulin receptor kinase and the tyrosine phosphorylation of IRS-1 remained unaffected. In this cell line, both insulin-stimulated accumulation of phosphatidylinositol 3,4,5-trisphosphate and the insulin-stimulated glucose uptake due to the translocation of GLUT1 glucose transporters were markedly impaired, whereas neither phorbol 12-myristate 13-acetate-stimulated glucose uptake nor the insulin-stimulated activation of RAS was impaired. These results suggest that PI 3-kinase is required for glucose transport in insulin signaling in CHO cells.

収録刊行物

• Proceedings of the National Academy of Sciences

  Proceedings of the National Academy of Sciences 91 (16), 7415-7419, 1994-08-02

  Proceedings of the National Academy of Sciences

キーワード

• Multidisciplinary

詳細情報

• CRID: 1363951795592589056
• NII論文ID: 80007774189
• DOI: 10.1073/pnas.91.16.7415
• ISSN: 10916490
• ISSN: 00278424
• Web Site: https://pnas.org/doi/pdf/10.1073/pnas.91.16.7415
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