Angiotensin II type 1 (AT(1)) receptor blockade enhances the L-NAME-induced vasoconstriction in rat submandibular gland.

Abstract:

:The vasoregulatory role of nitric oxide (NO) and angiotensin II type 1 (AT(1)) receptors in the circulation of the submandibular gland (SMG) of rats was studied. The glandular blood flow was determined by means of laser Doppler flowmetry and rubidium isotope technique. The data obtained by these two methods correlated well (r = 0.77; P < 0.01). The AT(1) receptor antagonist candesartan (0.5 mg kg(-1), i.v.) reduced the vascular resistance in the SMG by 37 % (P < 0.05). By contrast, the NO synthase blocker L-NAME (15 mg kg(-1), i.v.) significantly increased vascular resistance in the SMG both in candesartan-treated (P < 0.001) and non-treated (P < 0.001) animals. The increase in resistance was greater (P < 0.05) after previous blockade of AT(1) receptors. These findings suggest that the AT(1) receptors have an important role in the vasoregulation of the SMG in the rat. As a result of AT(1) blockade, NO-dependent tone of glandular vessels may be enhanced significantly.

journal_name

Exp Physiol

journal_title

Experimental physiology

authors

Vág J,Kerémi B,Hably C,Bartha J,Fazekas A

doi

10.1113/eph8702330

subject

Has Abstract

pub_date

2002-05-01 00:00:00

pages

327-33

issue

3

eissn

0958-0670

issn

1469-445X

pii

EPH_2330

journal_volume

87

pub_type

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