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Role of activated protein kinase C in the mechanism for MgATP-dependent Priming of exocytosis in adrenal chromaffin cells

Research Project

Project/Area Number 11680762
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Neurochemistry/Neuropharmacology
Research InstitutionKyorin University (2000-2001)
Sophia University (1999)

Principal Investigator

OHARA Mica  Kyorin University School of Medicine, Assistant, 医学部, 助手 (40201941)

Co-Investigator(Kenkyū-buntansha) SASAKAWA Nobuyuki  Sophia University, Faculty of Science and Technology, Associate Professor, 理工学部, 助教授 (20187107)
KUMAKURA Konosuke  Sophia University, Faculty of Science and Technology, Professor, 理工学部, 教授 (70129790)
NAGAMATSU Shinya  Kyorin University School of Medicine, Professor, 医学部, 教授 (80231489)
前川 昌平  神戸大学, 大学院・自然科学研究科, 教授 (40173695)
Project Period (FY) 1999 – 2000
Project Status Completed (Fiscal Year 2001)
Budget Amount *help
¥4,000,000 (Direct Cost: ¥4,000,000)
Fiscal Year 2000: ¥800,000 (Direct Cost: ¥800,000)
Fiscal Year 1999: ¥3,200,000 (Direct Cost: ¥3,200,000)
Keywordsprotein kinase C / exocytosis / RACK1 / chromaffin / F-actin / F-アクチン / プロテインキナーゼ C
Research Abstract

Previously, we suggested that protein kinase C (PKC) regulates MgATP-requiring stage without affecting the late MgATP-independent Ca^<2+>-triggered step immediately prior to membrane fusion in exocytosis in bovine adrenal chromaffin cells. RACK1, a receptor for activated PKC, has been identified by screening a rat brain expression library for proteins that binds activated PKC. To study a possible involvement of RACK1 in the PKC mediated regulation of the MgATP-requiring stage for exocytosis, we examined the subcellular localization of RACK1 and isoforms of PKC in adrenal chromaffin cells by immunocytochemistry. Immunoblotting tests with anti-RACK1 antibody indicated that RACK1 is enriched in Triton-insoluble fraction of the cells. Immunofluorescence with the anti-RACK1 antibody demonstrated that this protein is primarily localized in the subplasmalemmal region, and also in perinuclear region and cytosol of chromaffin cells. RACK1 in the subplasmalemmal region is co-localized with corti … More cal filamentous actin (F actin). Chromaffin cells contained PKC α, β, ε and ξ, and these PKC isoforms were distributed in the cytosol of control cells. In 12-0-tetradecanoylphorbol-13acetate (TPA) stimulated cells, only the conventional PKCs, α and β were translocated. After the translocation, PKCα was colocalized with RACK1 in subplasmalemmal region, and PKCβ was colocalized with RACK1 in subplasmalemmal region, perinuclear region and cytosol. Treatment of cells with an actin depolymerizing agent, mycalolide B (MLB) which severs F-actin to G-actin, produced a disappearance of the immunoreactivity of cortical F-actin and RACK1 in subplasmalemmal region in a dose-dependent manner. MLB prevented the translocation of PKCα and β to subplasmalemmal region by TPA stimulation. Treatment of cells with cytochalasin D (CD) which severs F-actin into short filaments, produced a disruption of FITC-phalloidin cortical fluorescent ring and the immunofluorescence intensity of RACK1 in subplasmalemmal region was slight decreased by CD. CD did not prevent the translocation of PKCα and β to subplasmalemmal region by TPA stimulation. Immunoblot analysis demonstrated that MLB facilitates the release of both actin and RACK1 from Triton-insoluble fraction of the cells, suggesting that RACK1 interacts with F actin in the cells. Anti-RACK1 antibody immunoprecipitated both RACK1 and actin from the extract of control cells. In addition, RACK1 was coimmunoprecipitated with actin, PKCα and β from the extract of TPA-treated cells by anti-RACK1 antibody. These results suggest a tight binding of RACK1 with subplasmalemmal F-actin, and that activated PKCα and β interact with F-actin through the binding to RACK1 in chromaffin cells. TPA selectively potentiated MgATP-dependent release from digitonin-permeabilized chromaffin cells. The potentiation was inhibited by a selective inhibitor of PKCα and β, and was activated by a selective activator of conventional PKCs. MLB inhibited the potentiation of release by TPA in a dose dependent manner. In contrast, CD had no effect on the potentiation. These results suggest that the interaction of activated PKCα and β with F actin through the binding to RACK1 is essential for the activation by PKC of MgATP requiring priming stage of exocytotic pathway, possibly in the preparation effusion machinery. Less

Report

(3 results)
  • 2001 Final Research Report Summary
  • 2000 Annual Research Report
  • 1999 Annual Research Report
  • Research Products

    (16 results)

All Other

All Publications (16 results)

  • [Publications] 今泉美佳: "CALI法の開口分泌機構研究への応用"神経化学. 38(3). 323 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Ohara-Imaizumi, M. et al.: "Subcellular Localization of RACK I in Adrenal Chromaffin Cells"Molecular and Cellular Biology of Catecholaminergic Systems (10th International Symposium on Chromaffin Cell Biology : Abstracts). 168 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Ohara-Imaizumi, M. et al.: "Application of chromophore-assisted laser inactivation to study protein function for exocytosis in adrenal chromaffin cells"Jpn.J.Pharmacol.. 79. 529 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Ohara-Imaizumi, M. et al.: "Application of chromophore-assisted laser inactivation (CALI) to study protein function for exocytosis in adrenal chromaffin cells"Neurochenical Research. 25. 1049 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] 今泉美佳: "副腎髄質クロマフイン細胞における分泌顆粒運動の実画像解析"神経化学. 39(3). 322 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Ohara-Imaizumi, M. et al.: "Dynamics of single secretory granules in live adrenal chromaffin cells"Neurochenical Research. 26. 304 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Kumakura, K.et al.: "In : Uemura, K., Kawamura, K., Yazaki, T.(eds) Keio University Symposia for life Science and medicine, Vol.2 Neural Development, Springer-Verlag Tokyo"Roles of synaptotagmin and inositol polyphosphates in the mechanism o exocytosis : The clamp hypothesis. 450-455 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Kumakura, K., Ohara-Imaizumi, M., Sasakawa, N., Fukuda, M., Niinobe, M., and Mikoshiba, K.: "Roles of synaptotagmin and inositol polyphosphates in the mechanism of exocytosis: The clamp hypothesis. In: Keio University Symposia for life Science and medicine. Vol. 2 Neural Development. Uemura, K., Kawamura, K., Yazaki, T. (eds)"Springer-Verlag Tokyo. 450-455 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Ohara-Imaizumi, M., Battaini, F. and Kumakura, K.: "Subcellular Localization of RACK 1 in Adrenal Chromaffin Cells 10th International Symposium on Chromaffin Cell Biology"Molecular and Cellular Biology of catecholaminergic Systems (Abstracts). 168 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Ohara-Imaizumi, M, Kishimoto, M., Kawanokuchi, J., Sasakawa, N., Kumakura, K.: "Application of chromophore-assisted laser inactivation to study protein function for exocytosis in adrenal chromaffin cells"Jpn. J. Pharmacol. 79 Supplement I. 529 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Ohara-Imaizumi, M., Kishimoto, M., Kawanokuchi, J., Sasakawa, N., Nishiki, T., Takahashi, M., Kumakura, K.: "Application of chromophore-assisted laser inactivation (CAL1) to study protein function for exocytosis in adrenal chromaffin cells"Neurochemical Research 25. 1049 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Ohara-Imaizumi, M., Okubo, S., Hayashi, M., Hosaka, S., Sasakawa, N., Kumakura, K.: "Dynamics of single secretory granules in live adrenal chromaffin cells"Neurochemical Research 26. 304 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] 今泉美佳: "副腎髄質クロマフィン細胞における分泌顆粒運動の実画像解析"神経化学. 39(3). 322 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] 今泉美佳: "CALI法の開口分泌機構研究への応用"神経化学. 38(3). 323 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] Kumakura,K.et al.,: "Roles of synaptotagmin and inositol polyphosphates in the mechanism of exocytosis:The clamp hypothesis."Keio University Symposia for life Science and medicine,Neural Development.. Vol.2. 450-455 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] Ohara-Imaizumi,M.et al.: "Subcellular Localization of RACK1 in Adrenal Chromaffin Cells"Molecular and Cellular Biology of Catecholaminergic Systems(10th International Symposium on Chromaffin Cell Biology:Abstracts). 1999. (168)

    • Related Report
      1999 Annual Research Report

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

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