Endothelin-1 expression in hearts of transgenic hypertensive mice overexpressing angiotensin II

Shinichi Maki, Takashi Miyauchi*, Satoshi Sakai, Tsutomu Kobayashi, Seiji Maeda, Yoshiko Takata, Fumihiro Sugiyama, Akiyoshi Fukamizu, Kazuo Murakami, Katsutoshi Goto, Yasuro Sugishita

*この研究の対応する著者

研究成果: Article査読

18 被引用数 (Scopus)

抄録

Cardiac myocytes and vascular endothelial cells produce endothelin (ET)-1, which has potent hypertrophic effects on cardiac myocytes. Although in cultured cardiomyocytes, angiotensin II (Ang II) was reported to enhance ET-1 production in vitro, it is not known whether ET-1 production is enhanced by Ang II in vivo. We investigated the production and pathophysiologic roles of ET-1 in 20-week-old male transgenic hypertensive mice (THM), in which the renin-angiotensin system (RAS) was markedly activated because of the presence of both human renin and angiotensinogen genes. Systolic blood pressure and the ratio of left ventricular weight to body weight were significantly higher in the THM than in control mice, indicating that THM developed cardiac hypertrophy. ET-1 production was significantly increased in the heart of THM because both ET-1 mRNA expression and peptide levels were significantly higher than in controls. However, circulating plasma ET-1 levels did not differ between the groups, and blood pressure did not change after i.v. injection with a high dose (3 mg/kg) of the ETA/B-nonselective receptor antagonist SB209670. These findings suggest that increased cardiac ET-1 production may contribute to the progression of cardiac hypertrophy and that endogenous ET-1 may not be involved in the short-term modulation of blood pressure in THM of this age.

本文言語English
ページ(範囲)S412-S416
ジャーナルJournal of Cardiovascular Pharmacology
31
SUPPL. 1
DOI
出版ステータスPublished - 1998
外部発表はい

ASJC Scopus subject areas

  • 薬理学
  • 循環器および心血管医学

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