Stimulation of renin secretion by potassium-channel activation with cromakalim.

Abstract:

:The cardiovascular and endocrine profile of cromakalim has been studied in 8 healthy men (age 25 +/- 2 years: means SEM) and its influence on renin release from cultured rat juxtaglomerular cells in vitro has also been examined. According to a double-blind, randomized sequence the subjects received placebo or cromakalim 1 mg as a single daily oral dose for 5 days. Compared to placebo, cromakalim significantly increased plasma renin activity (+ 122%; from 1.73 to 3.87 ng AI.ml-1.h-1), angiotensin II (+ 105%; from 5.1 to 10.5 pg.ml-1), and norepinephrine (+ 61%) levels, and heart rate (+ 8%). Plasma aldosterone, blood pressure and indices of the electrolyte-fluid volume state were unchanged. Cromakalim in vitro stimulated renin release, from 9.9 to 36.5 ng AI.h-1.30 min.mg cell protein, from juxtaglomerular cells. It appears that the presumed K+-channel activator cromakalim increases renin release in vivo at least in part by direct stimulation of renal juxtaglomerular cells.

journal_name

Eur J Clin Pharmacol

authors

Ferrier CP,Kurtz A,Lehner P,Shaw SG,Pusterla C,Saxenhofer H,Weidmann P

doi

10.1007/BF00558067

subject

Has Abstract

pub_date

1989-01-01 00:00:00

pages

443-7

issue

5

eissn

0031-6970

issn

1432-1041

journal_volume

36

pub_type

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