Mesenteric artery contractile properties during dietary calcium manipulation in spontaneously hypertensive and Wistar Kyoto normotensive rats.

Abstract:

:The hypothesis that elevated Ca2+ intake lowers blood pressure in the spontaneously hypertensive rat (SHR) by altering intrinsic contractile properties of vascular smooth muscle was tested. The effect of 0.5, 1, and 2% Ca2+ in the diet on systolic blood pressure, serum-ionized Ca2+, and contractile properties of mesenteric arteries isolated from SHR and normotensive Wistar-Kyoto (WKY) rats maintained on diets for 6 and 12 weeks was examined. Blood pressure was significantly elevated in SHR on 0.5% Ca2+ diets after both 6 and 12 weeks, as well as in WKY receiving 1% Ca2+. After six weeks on the diets for the SHR and 6 and 12 weeks for the WKY, serum-ionized Ca2+ was a function of the amount of Ca2+ in the diet. When contractile force generation in response tp KCl or norepinephrine was examined, small diet-related differences were detected, but no consistent linear effect associated with the level of Ca2+ in the diet was observed in either strain. When the sensitivity of the vessels to KCl and norepinephrine was examined, no effects of oral Ca2+ intake were detected. The results indicate that oral Ca2+ loading has modest effects on blood pressure at both 12 and 18 weeks of age in the SHR and WKY and in the younger rat, where Ca2+ intake modulates serum ionized Ca2+ levels. At no age does modification of Ca2+ intake have a consistent effect on mesenteric artery sensitivity or force-generating ability in response to KCl or norepinephrine. These findings do not support the hypothesis that oral Ca2+ loading lowers blood pressure in the rat by altering intrinsic contractile properties of vascular smooth muscle.

journal_name

Am J Hypertens

authors

Bukoski RD,Xue H,McCarron DA

doi

10.1093/ajh/2.6.440

subject

Has Abstract

pub_date

1989-06-01 00:00:00

pages

440-8

issue

6 Pt 1

eissn

0895-7061

issn

1941-7225

journal_volume

2

pub_type

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