当前位置： SCI文献检索 > JOURNAL OF THE AMERICAN COLLEGE OF CARDIOLOGY期刊下所有文献 > Upregulated expression of cardiac endothelin-1 participates in myocardial cell growth in Bio14.6 Syrian cardiomyopathic hamsters.

Upregulated expression of cardiac endothelin-1 participates in myocardial cell growth in Bio14.6 Syrian cardiomyopathic hamsters.

Abstract：

OBJECTIVES:The purpose of this study is to investigate the role of endogenous endothelin-1 (ET-1) in myocardial growth in Bio 14.6 Syrian cardiomyopathic hamsters (Bio). BACKGROUND:While ET-1, as a growth-promoting peptide, has been implicated in the development of secondary cardiac hypertrophy, the role of endogenous ET-1 in cardiac growth in primary myocardial disease is unknown. METHODS:We measured left ventricular ET-1 levels by a specific sandwich enzyme-linked immunosorbent assay. Furthermore, we examined the chronic effect of T0201, an ET type A receptor-specific antagonist. RESULTS:The ET-1 levels in the left ventricles were 1.8-fold higher (p < 0.0005) at 20 weeks and 6.4-fold higher (p < 0.0001) at 35 weeks in the Bio compared to age-matched control F1B hamsters (F1B). The Bio ET-1 levels in the lungs exhibited an only 1.3-fold elevation at 35 weeks. Immunohistochemistry demonstrated the localization of ET-1 mainly in the cardiac myocytes. The treatment with T0201 significantly reduced the heart weight/body weight ratio in the Bio, but did not affect the heart weight/body weight ratio in the F1B. Histologically, T0201 reduced the myocyte diameter of Bio to a level similar with that of F1B. However, T0201 did not affect the extent of fibrosis in Bio or F1B. CONCLUSIONS:The ET-1 level in the heart of cardiomyopathic hamsters increases in stage-dependent and organ-specific manners. Though myocyte degeneration and subsequent replacement fibrosis do not require an ET-1 pathway, the accelerated synthesis of ET-1 in the heart may contribute to the pathological growth of remaining myocytes in this animal model.

journal_name

J Am Coll Cardiol

journal_title

Journal of the American College of Cardiology

authors

Inada T,Fujiwara H,Hasegawa K,Araki M,Yamauchi-Kohno R,Yabana H,Fujiwara T,Tanaka M,Sasayama S

doi

10.1016/s0735-1097(98)00564-6

subject

Has Abstract

pub_date

1999-02-01 00:00:00

pages

565-71

issue

2

eissn

0735-1097

issn

1558-3597

pii

S0735-1097(98)00564-6

journal_volume

33

pub_type

杂志文章

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