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Molecular physiological and biological studies on the mechanismof impaired glucose-induced insulin secretion in diabetes mellitus

Research Project

Project/Area Number 09671048
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field 内分泌・代謝学
Research InstitutionKyorin University (1998-1999)
Kyoto University (1997)

Principal Investigator

ISHIDA Hitoshi  Professor, Third Department of Internal Medicine, Kyorin University, 医学部, 教授 (80212893)

Co-Investigator(Kenkyū-buntansha) NAGAMATSU Shinya  Associate Professor, Second Department of Biochemistry, Kyorin University, 医学部, 助教授 (80231489)
清野 裕  京都大学, 医学研究科, 教授 (40030986)
Project Period (FY) 1997 – 1999
Project Status Completed (Fiscal Year 1999)
Budget Amount *help
¥3,200,000 (Direct Cost: ¥3,200,000)
Fiscal Year 1999: ¥300,000 (Direct Cost: ¥300,000)
Fiscal Year 1998: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 1997: ¥2,400,000 (Direct Cost: ¥2,400,000)
Keywordsdiabetes mellitus / insulin secrction / intraccllular calcium / SNARE protcins / calmodulin / cyclic AMP / ATP-sensitive KィイD1+ィエD1 channel / voltage-dependent calcium channel / 電位依存性Ca^<2+>チャネル / 細胞内情報伝達系 / バッチクランプ法 / 膵β細胞 / 電位依存性CA^<2+>チャネル / ブドウ糖 / 細胞内Ca^<2+>濃度 / パッチクランプ法
Research Abstract

In order to elucidate the molecular mechanism of impairment of glucose-induced insulin secretion in type 2 diabetes mellitus, we examined the altered expression of SNARE proteins (syntaxin 1A and SNAP-25), which are known to play an important role on exocytolic process of insulin secretary granules as sensor molecules for the intracellular CaィイD12+ィエD1 elevation and metabolic signals derived from glucose, in diabetic GK (Goto-Kakizaki) rats. Immunoblot analysis revealed that protein levels of syntaxin 1A and SNAP-25 in GK rat islets decreased to 〜60% of the levels in control rat islets. Restoration of these proteins to normal levels in GK rats was achieved via the recombinant adenovirus-mediated gene transduction system. Glucose-stimulated insulin release from Adex 1CA syntaxin 1A and Adex 1CA SNAP-25-infected GK rat islets increased up to those from normal rat islets. The decreased expression of SNARE proteins is at least in part the defect responsible for impaired insulin secretion. For the screening of the agents, which can augment the CaィイD12+ィエD1 sensitivity of exocytotic mechanism of insulin secretory granules, pimobendan and JTT-608 were examined. Both of them increased the glucose-induced insulin secretion dose-dependently. Using electrically permeabilized rat pancreatic islets, they augmented the sensitivity for intracellular CaィイD12+ィエD1 elevation to trigger the exocytosis. It is revealed that pimobendan can exhibit its effect by in part activating CaィイD12+ィエD1/calmodulin dependent protein kinase II, and that JTT-608 can do it by inhibiting phosphodiesterase activity to increase intracellular cAMP levels. Accordingly, these agents would become novel therapeutic means for the treatment of impaired insulin secretion in type 2 diabetes mellitus.

Report

(4 results)
  • 1999 Annual Research Report   Final Research Report Summary
  • 1998 Annual Research Report
  • 1997 Annual Research Report
  • Research Products

    (33 results)

All Other

All Publications (33 results)

  • [Publications] E. Mukai, H. Ishida, et al: "The insulinotropic mechanism of the novel hypoglycemic agent JTT-608: direct enhancement of Ca_<2+> influx by phosphodiesterase inhibition"Br. J. Phramacol. (in press). (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] S. Nagamatsu, H. Ishida et al: "Decreased expression of t-SNAREs, syntaxin 1 and SNAP-25, in pancreatic β-cells is involved in impaired insulin secretion from diabetic GK rat islets."Diabates. 48(12). 2367-2373 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] M. Kajikawa, H. Ishida, et al: "An insulinotropic effect of vitamin D analog with increasing intracellular Ca_<2+> concentration in pancreatic β-cells, through non-genomic signal transduction."Endocrinology. 140(10). 4706-4712 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] H. Ishida, S. Kato, et al: "Beneficial effect of long-term combined treatment with voglibose and pioglitazone on pancreatic islet function of genetically diabetic GK rats."Horm. Metab. Res.. 30(11). 673-678 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] S. Fujimoto, H. Ishida, et al: "The novel insulinotropic mechanism of pimobendan: direct enhancement of the exocytotic process of insulin secretory granuled by increased Ca_<2+> sensitivity in β-cells"Endocrinology. 139(3). 1133-1140 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] E. Mukai, H. Ishida et al: "Metabolic inhibition impaires APT-sensitive K^+ channel block by sulfonylurea in pancreatic β cells"Am. J Physiol. 274. E38-E44 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] E.Mukai,H.Ishida,et aI: "The insulinotropic mechanism of the novel hypoglycemic agent JTT-608: direct enhancement of CaィイD12+ィエD1 efficacy and increase of CaィイD12+ィエD1 influx by phosphodiesterase inhibition"Br J Phramacol. (in press).

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] S. Nagamatsu, H. Ishida, et al.: "Decreased expression of t- SNAREs, syntaxin 1 and SNAP-25, in pancreatic β-cells is involved in impaired insulin secretion from diabetic GK rat islets"Diabetes. 48(12). 2367-2373 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Y. Tsuura, H, Ishida, et al.: "Regulation of intracellular ATP concentration under condition of reduced ATP consumption in pancreatic islets"Biochem Biophys res Commun. 261. 439-444 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] M. Kajikawa, H, Ishida, et al: "An insulinotropic effect of vitamin D analog with increasing intracellular CaィイD12+ィエD1 concentration in pancreatic β-cells, through non-genomic signal transduction"Endocrinology. 140(10). 4706-4712 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Y.Tsuura,H. Ishida,et al.: "Endogenous nitric oxide inhibits glucose-induced insulin secetion by suppression of phosphofructokinase activity in pancreaic islets."Biochem Biophys Res Commun. 252:. 34-38 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] H.Ishida, et al: "Beneficial effect of long- term combined treatment with voglibose and pioglitazone on pancreatic islet function of genetically diabetic GK rats"Horm Metab Res. 30(11). 673-678 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Y. Tsuura, H, Ishida, et al: "Ouabain suppresses ATP elevation in response to fuel secretagogues in pancreatic islets"Biochem Biophys Res Commun. 249. 853-857 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] S.Fujimoto, H. Ishida, et al: "The novel insulinotropic mechanism of pimobendan: direct enhancement of the exocytotic process of insulin secretory granules by increased CaィイD12+ィエD1 sensitivity in cells"Endocrinology. 139(3). 1133-1140 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] E. Mukai, H, Ishida, et al: "Metabolic inhibition impaires ATP-sensitive KィイD1+ィエD1channel block by sulfonylurea in pancreatic βcells"Am J Physiol. 274(Endocrinol. Metab.37). E38-E44 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] E.Mukai,H.Ishida,et.at.: "The insulinotropic mechanism of the novel hypoglycemic agcet JTT-608: dircct enhancement of Ca^<2+> cfficacy and increase of Ca^<2+> influx by phosphodiesterase inhibition."Br J Phramacol. (in press). (2000)

    • Related Report
      1999 Annual Research Report
  • [Publications] S.Nagamatsu,H.Ishida,et.at.: "Decreased expression of t-SNAREs,syntaxin 1 and SNAP-25 .in pancreatic β-cells is invoved in impaired insulin secretion form diabetic GK rat islets."Diabetes. 48(12). 2367-2373 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] Y.Tsuura,H.Ishida,et.al.: "Regulation of intracellular ATP concentration under condition of reduced ATP consumption in pancreatic islets."Biochem Biophys Res Commun. 261. 439-444 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] M.Kajikawa,H.Ishida,et.al.: "An insulinotropic effect of vitamin D analog with increasing intracellularCa^<2+> concentration in pancreatic β-cells, through non-genomic signal transduction."Endocrinology. 140(10). 4706-4712 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] Y.Tsuura,H.Ishida,et.al.: "Endogenous nitric oxide inhibits glucose-induced insulin secretion by suppression of phosphofructokinase activity in pancreatic islets."Biochem Biophys Res Commun. 252. 34-38 (1998)

    • Related Report
      1999 Annual Research Report
  • [Publications] Y.Tsuura,H.Ishida,et.al.: "Ouabain suppresses ATP elevation in resposnse to fuel secretagogues in pancretic islets."Biochem Biophys Res Commun. 249. 853-857 (1998)

    • Related Report
      1999 Annual Research Report
  • [Publications] E.Mukai,H.Ishida,et al.: "Metabolic inhibition impairs ATP-sensitive K^+ channel block by sulfonylurea in pancreatci β cells." Am J Physiol. 274. E38-E44 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] S.Fujimoto,H.Ishida et al.: "The novel insulinotropic mechanism of pimobendan:direct enhancement of the exocytotic process of insulin secretory granules by increased Ca^<2+> sensitivity in β cells." Endocrinology. 139. 1133-1140 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] N.Mizuno,H.Ishida,et al.: "Altered Bcl-2 and Bax expression and intracellular Ca^<2+> signaling in apoptosis of pancreatic β cells and the impairment of glucose-induced insulin secretion." Endocrinology. 139. 1429-1439 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] M.Nishimura,H.Ishida,et al.: "Necessity of endogenous GTP derived from glucose-6-phosphate for insulin secretion augmented by glucose under protein kinase A activation." Biochem Biophys Res Commun. 243. 253-257 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] E.Mukai,H.Ishida,et al.: "The antiarrhythmic agent cibenzoline inhibits K_<ATP>channels by binding to Kir6.2." Biochem Biophys Res Commun. 251. 477-481 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] H.Ishida,S.Kato,et al.: "Beneficial effect of long-term combined treatment with voglibose and pioglitazone on pancreatic islet function of genetically diabetic GK rats." Horm Metab Res. 30. 673-678 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] M.Nishimura et al.: "Necessity of endogenous GTP derived from glucose-6-phosphate for insulin secretion augmented by glucose under protein kinase A activation." Biochem.Biophys.Res.Commun.(in press).

    • Related Report
      1997 Annual Research Report
  • [Publications] N.Mizono et al.: "Altered Bcl-2 and Bax expression and intracellular Ca^<2+> signaling in apoptosis of pancreatic β-cells and the impairment of glucose-induced insulin secretion." Endocrinology. (in press).

    • Related Report
      1997 Annual Research Report
  • [Publications] S.Fujimoto et al.: "The novel insulinotropic mechanism of pimobendan : direct enhancement of the exocytotic process of insulin secretory granulas by increased Ca^<2+> sensitivity in β cells." Endocrinology. (in press).

    • Related Report
      1997 Annual Research Report
  • [Publications] E.Mukai et al.: "Metabolic inhibition impaires ATP-sensitive K^+ channel block by sulfonylurea in pancreatic β cells." Am.J.Physiol.(Endocrinol.Metab). (in press).

    • Related Report
      1997 Annual Research Report
  • [Publications] M.Horie et al.: "Insulin secretion adn its modulation by anatiarrhythmic and sulfonylurea drugs." Cardiovas Res. 34. 69-72 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] A.Kubota et al.: "Gastric inhibitory polypeptide activates MAP kinase through the wortmannin-sensitive and-insensitive pathways." Biochem.Biophys.Res.Commun.235. 171-175 (1997)

    • Related Report
      1997 Annual Research Report

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Published: 1997-04-01   Modified: 2016-04-21  

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