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Elucidation of the physiological role of myosin phosphatase in vascular endothelial cells and smooth muscle cells

Research Project

Project/Area Number 11670687
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Circulatory organs internal medicine
Research InstitutionKYUSHU UNIVERSITY

Principal Investigator

HIRANO Katsuya (2000)  GRAD SCH MED, SCI.KYUSHU UNIVERSITY LECTURER, 大学院・医学研究院, 講師 (80291516)

周 応畢 (1999)  九州大学, 大学院・医学系研究科, 助手 (80294916)

Co-Investigator(Kenkyū-buntansha) JUNJI Nishimura  GRAD SCH MED SCI, KYUSHU UNIVERSITY ASCOSSIATE PROF., 大学院・医学研究院, 助教授 (90237727)
平野 勝也  九州大学, 大学院・医学系研究科, 講師 (80291516)
Project Period (FY) 1999 – 2000
Project Status Completed (Fiscal Year 2000)
Budget Amount *help
¥3,600,000 (Direct Cost: ¥3,600,000)
Fiscal Year 2000: ¥1,100,000 (Direct Cost: ¥1,100,000)
Fiscal Year 1999: ¥2,500,000 (Direct Cost: ¥2,500,000)
KeywordsMYOSIN / PROTEIN PHOSPHATASE / REGULATORY SUBUNIT / VASCULAR SMOOTH MUSCLE / VASCULAR ENDOTHELIAL CELL / Ca^<2+> SENSITIVITY / CELL PROLIFERATION / CYTOSKELETON / 血管平滑筋 / 血管緊張 / 血管構築
Research Abstract

The phosphorylation of myosin light chain plays a key role in the regulation of vascular tone. In addition, myosin phosphorylation is also essential in the regulation of motility and cytoskeletal organization in the non-muscle cells. The myosin phosphatase has been recently cloned and is composed of three subunits ; a 38 kDa catalytic subunit and two regulatory subunits of 20 kDa and 110 kDa. However, the physiological role of myosin phosphatase in the vascular smooth muscle and endothelial cells remained to be investigated.
In this project, we first elucidated the regulatory role of the myosin phosphates in smooth muscle contraction by examining the effects of the recombinant 110 kDa regulatory subunit (MYPT1) and its mutants on the Ca^<2+>-induced contraction and myosin light chain phosphorylation in the TritonX100-permeabilized porcine renal arterial strips. Series of truncation mutants of MYPT1 were constructed. Incubating the permeabilized fibers with 3 μM MYPT1^<1-633> (a fragment … More corresponding to residues 1-633) or MYPT1^<39-633> for 3 h enhanced the Ca^<2+> induced contraction and caused a leftward shift of the Ca^<2+>-tension curve. Application of 3 μM MYPT1^<1-374>, MYPT1^<304-511> or MYPT1^<297-374> induced contractions in the presence of 180 nM Ca^<2+> and caused a leftward shift of the Ca^<2+>-tension curve. However, MYPT1^<1-296> lacking an acidic cluster had no effect on the Ca^<2+>-induced contraction. The enhancement of Ca^<2+>-induced contraction by MYPT1 mutants was associated with an increase in myosin light chain phosphorylation. The level of myosin light chain phosphorylation obtained with 300 nM Ca^<2+> in the presence and absence of 3 μM MYPT1^<1-374> were 35.7 % and 22.4 %, respectively. The relaxation induced by changing Ca^<2+> concentraion from 10 μM to 0 M was retarded by MYPT1^<1-374>. We concluded that the N-terminal mutants of MYPT1 containing the 304-374 residues had a Ca^<2+> sensitizing effect in permeabilized porcine renal artery. This effect is due to inhibition of phosphatase activity. The region of 304-374 residues may be an inhibitory domain of MYPT1.
We next elucidated that endothelial cells, in situ and in primary culture, express the 130 kDa subunit of myosin phosphatase, similar to the smooth muscle MYPT1 by the western blot analysis with anti-MYPT1 antibody. In the growing cells, MYPT1 was localized on stress fiber, but at confluence the localization pattern changed and MYPT1 was distributed close to the cell membrane and at cell-cell contacts. Screening of an endothelial cell cDNA library yielded a clone encoding an NH_2-terminal fragment of 89.6 kDa, closely related to smooth muscle MYPT1. The regulatory mechanism of endothelial cytoskeleton was suggested to be similar to the regulatory mechanism of smooth muscle contraction. Less

Report

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

    (23 results)

All Other

All Publications (23 results)

  • [Publications] Zhou YB,Hirano K,Sakihara C,Nishimura J,Kanaide H: "NH_2-terminal fragments of 130 kDa subunit of myosin phosphatase increases Ca^<2+> sensitivity of the porcine renal artery."Journal of Physiology. 516. 55-65 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Zhou YB,Nishimura J,Hirano K,Kanaide H: "The exogenously added small subunit of smooth muscle myosin phosphatase increases the Ca^<2+> of the contractile apparatus in the permeabilized porcine renal artery."Biochemical and Biophysical Research Communications. 254. 158-163 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Hirano M,Niiro N,Hirano K,Nishimura J,Hartshorne DJ,Kanaide H: "Expression, subcellular localization and cloning of the 130 kDa regulatory subunit of myosin phosphatase in porcine aortic endothelial cells."Biochemical and Biophysical Research Communications. 254. 490-496 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Hartshorne DJ,Hirano K: "Interactions of protein phosphatase type1, with a focus on myosin phosphatase."Molecular and Cellular Biochemistry. 190. 79-84 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Arimura T,Suematsu N,Zhou YB,Nishimura J,Satoh S, et cl.: "Identification, characterization and functional analysis of heart-specific myosin light chain phosphatase small subunit"Journal of Biological Chemistry. (in press). (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] 平野勝也,金出英夫: "血管平滑筋の緊張制御に関する最新情報:Ca^<2+>感受性調節におけるミオシン脱リン酸化酵素の役割"医学のあゆみ. 191. 332-337 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Y.B.Zhou, K.Hirano, C.Sakihara, J.Nishimura, H.Kanaide.: "NH_2-terminal fragments of 130 kDa subunit of myosin phosphatase increases Ca^<2+> sensitivity of the porcine renal artery."Journal of Physiology. vol.516. 55-65 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Y.B.Zhou, J.Nishimura, K.Hirano, H.Kanaide: "The exogenously added small subunit of smooth muscle myosin phosphatase increases the Ca^<2+> sensitivity of the contractile apparatus in the permeabilized porcine renal artery."Biochemical and Biophysical Research Communications. vol.254. 158-163 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] M.Hirano, N.Niiro, K.Hirano, J.Nishimura, D.J.Hartshorne, H.Kanaide: "Expression, bcellular localization and cloning of the 130 kDa regulatory subunit of myosin phosphatase in porcine aortic endothelial cells."Biochemical and Biophysical Research Communications. vol.254. 490-496 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] D.J.Hartshorne DJ, K.Hirano: "Interactions of protein phosphatase type1, with a focus on myosin phosphatase."Molecular and Cellular Biochemsitry. vol.190. 79-84 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] T.Arimura, N.Suematsu, Y.B.Zhou, J.Nishimura, S.Satoh, A.Takeshita, H.Kanaide, A.Kimura: "Identification, characterization and functional analysis of heart-specific myosin light chain phosphatase small subunit."Journal of Biological Chemistry. (in press). (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Zhou YB,Hirano K,Sakihara C,Nishimura J,Kanaide H: "NH_2-terminal fragments of 130 kDa subunit of myosin phosphatase increases Ca^<2+> sensitivity of the porcine renal artery."Journal of Physiology. 516. 55-65 (1999)

    • Related Report
      2000 Annual Research Report
  • [Publications] Zhou YB,Nishimura J,Hirano K,Kanaide H: "The exogenously added small subunit of smooth muscle myosin phosphatase increases the Ca^<2+> of the contractile apparatus in the permeabilized porcine renal artery."Biochemical and Biophysical Research Communications. 254. 158-163 (1999)

    • Related Report
      2000 Annual Research Report
  • [Publications] Hirano M,Niiro N,Hirano K,Nishimura J,Hartshorne DJ,Kanaide H: "Expression, subcellular localization and cloning of the 130 kDa regulatory subunit of myosin phosphatase in porcine aortic endothelial cells."Biochemical and Biophysical Research Communications. 254. 490-496 (1999)

    • Related Report
      2000 Annual Research Report
  • [Publications] Hartshorne DJ,Hirano K: "Interactions of protein phosphatase type 1, with a focus on myosin phosphatase."Molecular and Cellular Biochemistry. 190. 79-84 (1999)

    • Related Report
      2000 Annual Research Report
  • [Publications] Arimura T,Suematsu N,Zhou YB,Nishimura J,Satoh S, et cl.: "Identification, characterization and functional analysis of heart-specific myosin light chain phosphatase small subunit"Journal of Biological Chemistry. (in press). (2001)

    • Related Report
      2000 Annual Research Report
  • [Publications] 平野勝也,金出英夫: "血管平滑筋の緊張制御に関する最新情報:Ca^<2+>感受性調節におけるミオシン脱リン酸化酵素の役割"医学のあゆみ. 191. 332-337 (1999)

    • Related Report
      2000 Annual Research Report
  • [Publications] Zhou YB. Hirano K. Sakihara C, Nishimura J. et al.: "NH_2-terminal fragments of 130 kDa subunit of myosin phosphatase increases Ca^<2+> sensitivity of the porcine renal artery"Journal of Physiology. 516. 55-65 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] Zhou YB. Nishimura J. Hirano K, et al.: "The exogenously added small subunit of smooth muscle myosin phosphatase the Ca^<2+> sensitivity of the contractile apparatus in the permeabilized porcine renal artery"Biochemical and Biophysical Research Communications. 254. 158-163 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] Hirano M, Niiro N, Hirano K et al.: "Expression, subcellular localization, and cloning of the 130-kDa regulatory subunit of myosin phosphatase in porcine aortic endothelial cells"Biochemical and Biophysical Research Communications. 254. 490-496 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] Ihara E, Hirano K, Nishimura J, et al.: "Thapsigargin-induced endothelium-dependent triphasic regulation vascular tone in the porcine renal artery"British Journal of Pharmacology. 128. 689-699 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] Kawasaki J, Hirano K, Nishimura J, et al.: "Troglitazone inhibits the capacitative Ca^<2+> entry in endothelial cells"European Journal of Pharmacology. 373. 111-120 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] Yasutsune T, Kawakami N,Hirano K, Nishimura J, et al.: "Vasorelaxation and inhibition of the voltage-operated Ca^<2+> channels by FK506 in porcine coronary artery"British Journal of Pharmacology. 126. 717-729 (1999)

    • Related Report
      1999 Annual Research Report

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

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