Resistance artery phosphoinositide metabolism in genetic hypertension.

Abstract:

:Precapillary resistance arteries from spontaneously hypertensive rats (SHR) and Wistar-Kyoto normotensive rats (WKY) were found to contain three inositol lipids and to produce five inositol phosphate peaks. These were assessed by a highly sensitive procedure which involved the separation of radiolabelled inositol-containing components by anion-exchange high-performance liquid chromatography. Basal levels of radiolabelled inositol lipids were found to be significantly increased in SHR at 5 weeks of age, and also increased at 12 weeks, although this was only statistically significant for glycerophosphoinositol. At 5 weeks of age, exposure to a maximal concentration of noradrenaline brought about a significant increase in lipid radioactivity in WKY and in glycerophosphoinositol and glycerophosphoinositol 4-phosphate in SHR. The levels of these lipids remained significantly raised in the SHR at this time. At 12 weeks of age, exposure to noradrenaline produced reductions in radioactivity associated with inositol lipids. These new levels were elevated in SHR and significant for glycerophosphoinositol 4-phosphate. Basal levels of four inositol phosphates were not different between the two rat strains at 5 weeks of age. Inositol 1,3,4-trisphosphate was only present at minute levels and could not be measured. At 12 weeks of age, basal radiolabelling of inositol phosphates was not different between the two strains. The application of noradrenaline caused age-dependent changes in arterial inositol-containing compounds in both strains, which resulted in increased levels of inositol 1,4,5-trisphosphate in young SHR and also in adult rats in which the blood pressure level had become established.(ABSTRACT TRUNCATED AT 250 WORDS)

journal_name

J Hypertens

journal_title

Journal of hypertension

authors

Durkin H,Ollerenshaw JD,Heagerty AM

doi

10.1097/00004872-199006000-00009

subject

Has Abstract

pub_date

1990-06-01 00:00:00

pages

557-63

issue

6

eissn

0263-6352

issn

1473-5598

journal_volume

8

pub_type

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