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2001 Fiscal Year Final Research Report Summary

The role of PDGF-B chain after vascular injury

Research Project

Project/Area Number 10671104
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field General surgery
Research InstitutionThe University of Tokyo

Principal Investigator

MIYATA Tetsuro  the University of Tokyo, Surgery, Associate Professor, 医学部・附属病院, 講師 (70190791)

Co-Investigator(Kenkyū-buntansha) TAKUWA You  the University of Kanazawa, Medicine, Physiology, Professor, 医学部, 教授 (60171592)
Project Period (FY) 1998 – 2000
KeywordsPDGF-B chain / neointimal formation / PDGFXR / adenovirus / neointimal SMC / angiotensin II
Research Abstract

Vascular stenosis occurs in many patients after angioplasty because of neointima formation due to migration and proliferation of vascular smooth muscle cells (SMC). A variety of growth factors have been implicated in neointima formation including platelet-derived growth factor (PDGF) and angiotensin II. In this study, we obtained several new findings. First, we demonstrated the important role of PDGF in the phase of neointimal development after arterial injury. We administered Trapidil, which is thought to be the only drug blocking the action of PDGF almost selectively, during the phase of developing the neointima formation in a rat carotid balloon injured model. Second, we demonstrated endogenous PDGF-B chain among PDGFs played the most imporlant role during the same phase in a rat model. We made the soluble extracellular region of PDGF-β receptor (PDGFXR) as a selective antagonist ofPDGF-B. In cultured SMC, we found PDGFXR abolishes function of PDGF-B i.e. stimulation of PDGF-β receptor tyrosine phosphoroyation and DNA synthesis. In a rat carotid balloon injured model, we demonstrated that PDGF-β receptor is activated more significantly in the phase of the neointima development. Transfection of injured rat carotid arteries with adenoviral vector containing PDGFXR gene nearly completely suppressed activation of PDGF-α receptor and reduced neointima formation. Third, we found that neointimal SMC produced PDGF-B chain in response to angiotensin II (Ang II). Fourth, we demonstrated Ang II activated several molecules, which act as a switch of signal transduction. PDGF-B production via Ras, ERK, JNK, and Egr-1. These results indicate that PDGF-B chain, produced locally by neointimal SMC, plays an essential role in neointima formation after arterial injury. They also suggest the utility of PDGFXR as a therapeutic gene for preventing vascular stenosis after arterial injury.

  • Research Products

    (8 results)

All Other

All Publications (8 results)

  • [Publications] J.Abe: "Stimulated activation of platelet-derived growth factor receptor in vivo in balloon injured arteries"Circulation. 96. 1906-1913 (1997)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] J.Deguchi: "Targeting endogenous platelet-derived growth factor B-chain by aderovirus-mediated gene transter portly inhibits in vivo smooth muscle prolifection after artecial injury"Gene therapy. 6. 956-965 (1999)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] J.Deguchi: "Inhibitory effects of Tropidil on PDGF signaling in balloon-injured rat carotid artery"Life Sciences. 65. 2791-2799 (1999)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] J.Deguchi: "Anpioteusin II stimulates platelet-derived growth factor-B chain expression in new-pan rat vascular smooth muscle cells and neointinal cells through ERK and JNK"Circulation Research. 85. 565-574 (1999)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] J. Abe, J. Deguchi, T. Matsumoto, N. Takuwa, M. Noda, M. Ohno, M. Makuuchi, K. Kurokawa, and Y. Takuwa: "Stimulated activation of platelet-derived growth factor receptor in vivo in balloon -injured arteries: a link between angiotensin II and intimal thickening"Circulation. 96. 1906-1913 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] J. Deguchi, T. Namba, H. Hamada, T. Nakaoka, J. Abe, O. Sato, T. Miyata, M. Makuuchi, K. Kurokawa, and Y. Takuwa: "Targeting endogenous platelet-derived growth factor B-chain by adenovirus-mediated gene transfer potently inhibits in vivo smooth muscle proliferation after arterial injury"Gene Therapy. 6. 956-965 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] J. Deguchi, J. Abe, M. Makuuchi, and Y. Takuwa: "Inhibitory effects of Trapidil on PDGF signaling in balloon-injured rat carotid artery"Life Sciences. 65. 2791-2799 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] J. Deguchi, M. Makuuchi, T. Nakaoka, T. Collias, and Y. Takuwa: "Angiotensin II stimulates platelet-derived growth factor-b chain expression in newborn rat vascular smooth muscle cells and neointimal cells through Ras, Extracellular Signal-Regulated Protein Kinase, and c-Jun N-Terminal Kinase mechanisms"Circ Res.. 85. 565-574 (1999)

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 2003-09-17  

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