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. 1991 Jun;103(2):1509–1514. doi: 10.1111/j.1476-5381.1991.tb09818.x

Regional haemodynamic effects of prolonged infusions of human alpha-calcitonin gene-related peptide in conscious, Long Evans rats.

S M Gardiner 1, A M Compton 1, P A Kemp 1, T Bennett 1, R Foulkes 1, B Hughes 1
PMCID: PMC1908353  PMID: 1884105

Abstract

1. Haemodynamic measurements were made in conscious, Long Evans rats chronically instrumented for the assessment of changes in regional blood flows (renal, mesenteric and hindquarters, or internal and common carotid) and systemic arterial blood pressure and heart rate, before, during and after 3 day infusions of vehicle or human alpha-calcitonin gene-related peptide (CGRP) (1.5 or 15 nmol kg-1 h-1). 2. In animals with renal, mesenteric and hindquarters flow probes (n = 8), during the first day of infusion of human alpha-CGRP (1.5 nmol kg-1 h-1) there was sustained tachycardia and hypotension, a sustained reduction in renal flow, a transient reduction in mesenteric flow and a relatively well-maintained increase in hindquarters flow. All these effects were significantly different from the changes seen in vehicle-infused rats (n = 8), but calculation of vascular conductances showed only the late mesenteric vasodilatation and the sustained hindquarters vasodilatation were different from the changes in vehicle-infused rats. However, by the second day of infusion and thereafter cardiovascular variables in the animals receiving vehicle and those receiving human alpha-CGRP were not different. 3. Nine animals instrumented with probes to monitor changes in internal and common carotid haemodynamics initially received human alpha-CGRP infused at a rate of 1.5 nmol kg-1 h-1. Three of these animals still showed some response to the human alpha-CGRP (tachycardia, hypotension, hyperaemic vasodilatation) throughout the second day of infusion and hence were taken through the 3 day infusion protocol. When the infusion was stopped on the fourth day all these animals showed reversal of the effects of human alpha-CGRP.(ABSTRACT TRUNCATED AT 250 WORDS)

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Selected References

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