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A Pathophysiological Role of Growth Factors in Idiopathic Cardiomyopathy.

Research Project

Project/Area Number 06670747
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Circulatory organs internal medicine
Research InstitutionNippon Medical School

Principal Investigator

TOMITA Yoshifumi  Nippon Medical School, 1st Internal Medicine, Assistant, 医学部, 助手 (00180175)

Co-Investigator(Kenkyū-buntansha) NAGAE Yasuhiro  Nippon Medical School, 1st Internal Medicine, Assistant, 医学部, 助手 (10189102)
SEINO Yoshihiko  Nippon Medical School, 1st Internal Medicine, Lecturer, 医学部, 講師 (10163073)
Project Period (FY) 1994 – 1996
Project Status Completed (Fiscal Year 1996)
Budget Amount *help
¥1,800,000 (Direct Cost: ¥1,800,000)
Fiscal Year 1996: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 1995: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 1994: ¥500,000 (Direct Cost: ¥500,000)
Keywordsgrowth factor / FGF / TGFbeta / apoptosis / cardiomyopathy / model animal / cardiac hypertrophy / cardiomyopathy / cardiomyocyte / in situ hybridization / FGF(fibroblast growth factor)
Research Abstract

To clarify pathophysiological roles of FGF in idiopathic cardiomyopathy, LV endomyocardial biopsy specimens from 24 patients (9 HCM,12 DCM,and 3 hypertensive hypertrophy) and 6 controls were stained for acidic FGF (aFGF) and basic FGF using immunohistochemistry. Positive staining of acidic FGF was observed in myocytes of biopsy specimen from 15 of 21 (71%) cardiomyopathy patients, all hypertensive hypertrophy patients, but none of the controls (p<0.01 ; cardiomyopathy vs controls). Average diameter of myocytes was larger in patients with positive aFGF staining than those with negative staining. Percent area of fibrosis and capillary vessel density were not significantly different between two groups, however. intense expression of aFGF mRNA was observed in myocytes from the patients with positive aFGF protein.
The findings above mentioned were further ascertained by experimental study in cardiomyopathic animals. Syrian hamster BIO14.6 (aged 6 and 20 weeks) and control hamster (F1beta) with the matched age were used (n=12). Histological examination, western blot for aFGF protein, and immunohistochemistry using polyclonal anti-human acidic FGF and oplyclonal anti-human VEGF165 were evaluated. Immunostaining revealed marked accumulation of aFGF in myocytes from BIO 14.6 hamster, especially in degenerated myocytes. Positive staining of aFGF in myocytes were observed in 6/6 of BIO 14.6 hamsters, while in 1/6 of control hamster. Western blot for aFGF protein showed 19kD band was more apparent in myocardial extract of BIO 14.6 hamster than control hamster F1beta.
[Conclusion]
Expression of aFGF was significantly increased in the left ventricle of human idiopathic cardiomyopathy and hamster cardiomyopathy. It is suggested that aFGF might play an important role in myocyte hypertrophy and repair response of myocardial degeneration in animal cardiomyopathy. Further study is needed to clarify whether aFGF is ameliorating or deteriorating factor in cardiomyopathy.

Report

(4 results)
  • 1996 Annual Research Report   Final Research Report Summary
  • 1995 Annual Research Report
  • 1994 Annual Research Report
  • Research Products

    (7 results)

All Other

All Publications (7 results)

  • [Publications] 富田喜文: "特発性心筋症における線維芽細胞増殖因子の免疫組織化学的検討" 厚生省特定疾患,特発性心筋症調査研究班,平成6年度研究報告集. 75-79 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] 富田喜文: "心筋症ハムスターBIO14.6の心筋組織における細胞増殖因子の検討" 厚生省特定疾患,特発性心筋症調査研究班,平成7年度研究報告集. 94-98 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Y.Tomita: "Expression of Fibroblast Growth Factor in the Left Ventride of Patients with Idiopsthic Cardiomyopathy." Journal of American College of Cardiology. 27(Suppl.A). 227A (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Y.Tomita et al.: "Expression of Fibroblast Growth Factor in the Left Ventricle of Patients with Idiopathic Cardiomyopathy" Journal of American College of Cardiology. 27 (Suppl.A). 227A (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] 富田喜文,他: "心筋症ハムスターBIO14.6の心筋組織における細胞増殖因子の検討" 平成7年度厚生省特定疾患特発性心筋症調査研究班報告集. 94-98 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] 富田喜文: "特発性心筋症における線維芽細胞増殖因子の免疫組織化学的検討" 特発性心筋症調査研究班平成6年度研究報告集. 75-79 (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] Yoshifumi Tomita: "Expression of Fibroblast Growth Factor in the Left Ventricle of Patients with Idiopathic Cardiomyopathy." Journal of American College of Cardiology. 27. 227A (1996)

    • Related Report
      1995 Annual Research Report

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Published: 1994-04-01   Modified: 2016-04-21  

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