Renal vascular resistance and reactivity in the spontaneously hypertensive rat

Publisher Website
Google Scholar
Abstract
Renal vascular resistance is elevated in spontaneously hypertensive rats (SHR) when compared to normotensive control Wistar-Kyoto rats (WKY). The possible determinants of this raised vascular resistance in in situ autoperfused kidneys of pentobarbital-anesthetized, 12- to 16-wk-old SHR and WKY were studied. Over a wide range of arterial pressures (30-100 mmHg) renal blood flow was consistently higher in WKY than in SHR. This relative flow difference was unchanged by acute renal denervation, with renal vascular resistance decreasing .apprx. 20% in both strains. Changes in renal vascular resistance to renal nerve stimulation and the administration of intra-arterial vasoactive hormones also were assessed. Vascular responses to renal nerve stimulation, tyramine, angiotensin II and acetylcholine were similar in kidneys of the 2 strains, but reactivity to norepinephrine was significantly less in kidneys of SHR. Apparently elevated renal vascular resistance in the SHR does not result from an excessive neurogenic influence on the renal vasculature or from vascular hyperreactivity to norepinephrine or angiotensin II.

This publication has 2 references indexed in Scilit: