Different vascular responsiveness to angiotensin II in two normotensive rat strains.

Abstract:

:Rats of the Fischer 344 (F344) and Wistar Kyoto (WKY) strains are known to present differences in stimuli responses involving the renin-angiotensin system and in cardiovascular responses to an acoustic startle stimulus. Here we compared the vascular reactivity to angiotensin II (ANG II) of these normotensive, inbred rat strains. Blood pressure (BP) and heart rate (HR) were recorded in conscious rats, before and after a neurohumoral blockade obtained by successive administration of chlorisondamine, enalapril, a V1-vasopressinergic receptor antagonist (Manning compound) and atropine methyl nitrate. BP was restored by a constant infusion of noradrenaline. Boluses of ANG II ranging from 0.001 to 1280 ng/kg were injected randomly. Average dose-response curves were established. After neurohumoral blockade, the minimum mean BP (MBP) produced by hydralazine (3 mg/kg, i.v.) and the maximum MBP produced by noradrenaline (60 microg/mL and 800 microL/min, i.v.) were used to reflect arterial wall structure. The maximal systolic blood pressure (SBP) and pulse pressure (PP) responses to ANG II were higher in F344 compared with WKY (+86 +/- 3 mmHg vs. +71 +/- 3 mmHg, P < 0.01 for SBP, +31 +/- 2 mmHg vs. +18 +/- 1 mmHg, P < 0.001 for PP). After the ANG II type 1 (AT1) receptor blocker valsartan, ANG II had no significant effect on BP. F344 and WKY exhibited the same maximum MBP in response to noradrenaline. However, MBP level following hydralazine was higher in F344 (F344: 48 +/- 2 mmHg vs. WKY: 37 +/- 3 mmHg, P < 0.01). The amplification in F344 of the vasoconstrictive response to ANG II mediated by AT1 receptors is compatible with a high number of AT1 receptors in this strain. In F344, the exaggerated systolic and PP responses to ANG II and the higher MBP level after hydralazine most likely reflect a structural modification of the arterial wall such as hypertrophic remodelling in F344.

journal_name

Fundam Clin Pharmacol

authors

Herin L,Blanc J,Basset A,Laude D,Laurent S,Elghozi JL

doi

10.1046/j.1472-8206.2003.00145.x

subject

Has Abstract

pub_date

2003-06-01 00:00:00

pages

315-21

issue

3

eissn

0767-3981

issn

1472-8206

pii

145

journal_volume

17

pub_type

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