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Molecular approach for the mechanism of insulin-stimulated glucose transport

Research Project

Project/Area Number 11470234
Research Category

Grant-in-Aid for Scientific Research (B).

Allocation TypeSingle-year Grants
Section一般
Research Field Metabolomics
Research InstitutionYamaguchi University

Principal Investigator

OKA Yoshitomo  Yamaguchi University, School of Medicine, Professor, 医学部, 教授 (70175256)

Co-Investigator(Kenkyū-buntansha) MASUJIMA Tsutomu  Hiroshima University Hospital, Professor, 医学部, 教授 (10136054)
KATAGIRI Hideki  Tokyo University Hospital, Clinical Fellow, 医学部・附属病院, 医員(臨床)
AOKI Minoru  Yamaguchi University, School of Medicine, Research Associate, 医学部, 助手 (70304475)
TANAKA Keiji  Yamaguchi University Hospital, Clinical Fellow, 医学部・附属病院, 医員(臨床)
INOUE Hiroshi  Yamaguchi University Hospital, Research Associate, 医学部・附属病院, 助手 (20294639)
Project Period (FY) 1999 – 2000
Project Status Completed (Fiscal Year 2000)
Budget Amount *help
¥14,800,000 (Direct Cost: ¥14,800,000)
Fiscal Year 2000: ¥3,800,000 (Direct Cost: ¥3,800,000)
Fiscal Year 1999: ¥11,000,000 (Direct Cost: ¥11,000,000)
KeywordsInsulin / glucose transport / GLUT4 / PI3 kinase / Akt1 / PDK1 / アデノウイルスベクター / Akt / PH domain
Research Abstract

To investigate the role of 3-phosphoinositide-dependent protein kinase 1 (PDK1) in the Akt1 phosphorylation state, wild-type (wt) PDK1 and its kinase dead (kd) mutant were expressed using an adenovirus gene transduction system in Chinese hamster ovary cells stably expressing insulin receptor. Immunoblotting using anti-phosphorylated Akt1 antibody revealed Thr-308 already to be maximally phosphorylated at 1 min but completely dephosphorylated at 5 min, with insulin stimulation, whereas insulin-induced Akt1 activation was maintained even after dephosphorylation of Thr-308. Overexpression of wt-PDK1 further increased insulin-stimulated phosphorylation of Thr-308, also followed by rapid dephosphorylation. The insulin-stimulated Akt1 activity was also enhanced by wt-PDK1 expression but was maintained even at 15 min. Thus, phosphorylation of Thr-308 is not essential for maintaining the Akt1 activity once it has been achieved. Interestingly, the insulin-stimulated phosphorylation state of Thr-308 was maintained even at 15 min in cells expressing kd-PDK1, suggesting that kd-PDK 1 has a dominant negative effect on dephosphorylation of Thr-308 of Akt1. Calyculin A, an inhibitor of PP1 and PP2A, also prolonged the insulin-stimulated phosphorylation state of Thr-308. In addition, in vitro experiments revealed PP2A, but not PP1, to dephosphorylate completely Thr-308 of Akt1. These findings suggest that a novel pathway involving dephosphorylation of Akt1 at Thr-308 by a phosphatase, possibly PP2A, originally, identified as is regulated downstream from PDK1, an Akt1 kinase.

Report

(3 results)
  • 2000 Annual Research Report   Final Research Report Summary
  • 1999 Annual Research Report
  • Research Products

    (24 results)

All Other

All Publications (24 results)

  • [Publications] Yamada T: "3-phosphoinsitide-dependent protein kinase 1, an Akt1 kinase, is involved in dephosphorylation of Thr308 of Akt1 in Chinese hamster ovary cells"J Biol Chem. 276. 5339-5345 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Itoh T: "Autophosphorylation of type I phosphatidylinositol phosphate kinase regulates its lipid kinase activity."J Biol Chem. 275. 19389-94 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Asano T: "p110beta is up-regulated during differentiation of 3T3-L1 cells and contributes to the highly insulin-responsive glucose transport activity."J Biol Chem. 275. 17671-6 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Funaki M: "p85/p110-type phosphatidylinositol kinase phosphorylates not only the D-3, but also the D-4 position of the inositol ring."J Biol Chem. 274. 22019-24 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Hosaka T: "Regulation of insulin-stimulated glucose transport by chronic glucose exposure in 3T3-L1 adipocytes."Endocrine Journal. 46. 349-357 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Ishihara H: "Type I Phosphatidylinositol-4-phosphate 5-Kinases. Cloning of the third isoform and deletion/substitution analysis of members of this novel lipid kinase family."J Biol Chem. 273. 8741-8748 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Yamada T et al: "3-phosphoinositide-dependent protein kinase 1, an Akt1 kinase, is involved in dephosphorylation of Thr308 of Akt1 in Chinese hamster ovary cells"J Biol Chem. 276. 5339-5345 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Itoh T et al: "Autophosphorylation of type I phosphatidylinositol phosphate kinase regulates its lipid kinase activity."J Biol Chem. 275. 19389-19394 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Asano T et al: "p110 beta is up-regulated during differentiation of 3T3-L1 cells and contributes to the highly insulin-responsive glucose transport activity."Biol Chem. 275. 17671-17676 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Funaki M et al: "p85/p110-type phosphatidylinositol kinase phosphorylates not only the D-3, but also the D-4 position of the inositol ring."J Biol Chem. 274. 22019-24220 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Hosaka T et al: "Regulation of insulin-stimulated glucose transport by chronic glucose exposure in 3T3-L1 adipocytes."Endocrine Journal. 46. 349-357 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Ishihara H et al: "Type I Phosphatidylinositol-4-phosphate 5-Kinases. Cloning of the third isoform and deletion/substitution analysis of members of this novel lipid kinase family."J Biol Chem. 273. 8741-4748 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Yamada T: "3-phosphoinositide-dependent protein kinase 1, an Akt1 kinase, is involved in dephosphorylation of Thr308 of Akt1 in Chinese hamster ovary cells "J Biol Chem. 276. 5339-5345 (2001)

    • Related Report
      2000 Annual Research Report
  • [Publications] Itoh T : "Autophosphorylation of type I phosphatidylinositol phosphate kinase regulates its lipid kinase activity."J Biol Chem. 275. 19389-94 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] Asano T : "p110beta is up-regulatedduring differentiation of 3T3-L1 cells and contributes to the highly insulin-responsive glucose transport activity."J Biol Chem. 275. 17671-6 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] Funaki M : "p85/p110-type phosphatidylinositol kinase phosphorylates not only the D-3, but also the D-4 position of the inositol ring."J Biol Chem. 274. 22019-24 (1999)

    • Related Report
      2000 Annual Research Report
  • [Publications] Hosaka T : "Regulation of insulin-stimulated glucose transport by chronic glucose exposure in 3T3-L1 adipocytes."Endocrine Journal. 46. 349-357 (1999)

    • Related Report
      2000 Annual Research Report
  • [Publications] Ishihara H: "Type I Phosphatidylinositol-4-phosphate 5-Kinases. Cloning of the third isoform and deletion/substitution analysis of members of this novel lipid kinase family."J Biol Chem. 273. 8741-8748 (1998)

    • Related Report
      2000 Annual Research Report
  • [Publications] Ishihara H, et al.: "Enhanced phosphoinositide hydrolysis via overexpression of phospholipase C β1 or δ 1 inhibits stimulus-induced insulin release in insulinoma MIN6 cells."Biochem Biohpys Res Commun. 254. 77-82 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] Tanizawa Y, et al.: "Overexpression of dominant cegative mutant hepatocyte nuclear factor(HNF)-1 αinhibits arginine-induced insulin secretion in MIN6 cells."Diabetologia. 42. 887-891 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] Hosaka T, et al.: "Regulation of insulin-stimulated glucose transport by chronic gulcose ixposure in 3T3-L1 adipocytes."Endocrine Journal. 46. 349-357 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] Funaki M, et al.: "p85/p110-type phosphatidylinostiol kinase phosphorylates not only the D-3, but also the D-4 position of the inositol ring."J. Biol Chem. 274. 22019-22024 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] Tanizawa Y, et al.: "Genetic analysis of Japanese patients with persistent hyperinsulinemic hypoglycemia of infancy.Nucleotide-binding fold-2 mutation impairs cooperative binding of adenine nucleotides to sulfonylurea receptor 1."Diabetes. 49. 114-120 (2000)

    • Related Report
      1999 Annual Research Report
  • [Publications] 保坂利男: "医学のあゆみ 脂肪細胞-基礎と臨床"医歯薬出版株式会社. 5 (1999)

    • Related Report
      1999 Annual Research Report

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Published: 1999-04-01   Modified: 2016-04-21  

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