Differential effects of alpha 1- and alpha 2-adrenoceptor agonists on peripheral vasoconstriction in pithed diabetic rats.

Abstract:

:The pressor responses to selective alpha 1-adrenoceptor agonists (cirazoline and methoxamine) and to alpha 2-adrenoceptor agonists (UK-14,304 and B-HT 933) were investigated in pithed, streptozotocin-induced diabetic rats and age-matched control animals. Three months after induction of diabetes, the basal values of diastolic blood pressure (DBP) were the same in pithed diabetic and control rats (34.3 +/- 4.4 vs. 32.8 +/- 4.4 mm Hg, p greater than 0.05, n = 30). In pithed diabetic rats, dose-response curves for the vasoconstrictor effects of cirazoline and methoxamine were shifted to the right with a slight decrease in the maximum response as compared with those in control animals. In contrast, no shift in dose-response curves for the alpha 2-adrenoceptor-mediated vasoconstrictor effects was observed, as reflected by similar pD2 values. A pronounced decrease in the maximum pressor response to the alpha 2-adrenoceptor agonists could be demonstrated. This reduction was significantly greater than that of the alpha 1-adrenoceptor agonists. In conclusion, the functional role of alpha 1- and alpha 2-adrenoceptors in the peripheral resistance vessels appears to be differentially influenced by the diabetic state.

journal_name

J Cardiovasc Pharmacol

authors

Heijnis JB,Mathy MJ,Pfaffendorf M,van Zwieten PA

doi

10.1097/00005344-199210000-00007

subject

Has Abstract

pub_date

1992-10-01 00:00:00

pages

554-8

issue

4

eissn

0160-2446

issn

1533-4023

journal_volume

20

pub_type

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