Effects of central endothelin-1 in normotensive and spontaneously hypertensive rats.

Abstract:

:Changes in blood pressure and sympathetic nerve activity induced by local injection of endothelin-1 into the rostroventrolateral medulla were studied in narcotized stroke-prone spontaneously hypertensive rats (SHRSP) and normotensive WKY rats. Endothelin-1 produced similar biphasic response in both rat strains: a transient increase in blood pressure and sympathetic nerve activity followed by progressive hypotension and bradycardia. Pretreatment with ETB-receptor antagonist BQ788 inhibited sympathetic activation induced by endothelin-1, while pretreatment with the ETA-receptor antagonist N-acetyl-[D-Trp16]-endothelin-1 abolished the subsequent hypotension. The antihypotensive effect of ETA-receptor blockade was most effective in normotensive rats. Our findings suggest that cardiovascular disorders in SHRSP rats can be related to peculiarities in the rostroventrolateral medullar endothelin system.

journal_name

Bull Exp Biol Med

authors

Ponomareva TI,Khokhlova ON,Tukhovskaya EA,Murashov AM

doi

10.1023/a:1024172611834

subject

Has Abstract

pub_date

2003-03-01 00:00:00

pages

237-40

issue

3

eissn

0007-4888

issn

1573-8221

journal_volume

135

pub_type

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