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The Journal of Physiology
Article . 2004 . Peer-reviewed
License: Wiley Online Library User Agreement
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Evidence for the involvement of VPAC1 and VPAC2 receptors in pressure‐induced vasodilatation in rodents

Authors: Lionel, Fizanne; Dominique, Sigaudo-Roussel; Jean Louis, Saumet; Bérengère, Fromy;

Evidence for the involvement of VPAC1 and VPAC2 receptors in pressure‐induced vasodilatation in rodents

Abstract

A transient increase in skin blood flow in response to an innocuous local pressure application, defined as pressure‐induced vasodilatation (PIV), delays the occurrence of ischaemia, suggesting a protective feature against applied pressure. The PIV response depends on capsaicin‐sensitive nerve fibres and calcitonin gene‐related peptide (CGRP) has been shown to be involved. In these fibres, CGRP coexists with pituitary adenylate cyclase‐activating polypeptide (PACAP). Three distinct receptors mediate the biological effects of PACAP: VPAC1 and VPAC2 receptors binding with the same affinity for PACAP and vasoactive intestinal peptide and PAC1 receptors showing high selectivity for PACAP. Because the receptors are widely expressed in the nervous system and in the skin, we hypothesized that at least one of them is involved in PIV development. To verify this hypothesis, we used [d‐p‐Cl‐Phe6,Leu17]‐VIP (nonspecific antagonist of VPAC1/VPAC2 receptors), PG 97‐269 (antagonist of VPAC1 receptors), PACAP(6–38) (antagonist of VPAC2/PAC1 receptors) and Max.d.4 (antagonist of PAC1 receptors) in anaesthetized rodents. The blockade of VPAC1/VPAC2, VPAC1 or VPAC2/PAC1 receptors eliminated the PIV response, whereas PAC1 blockade had no effect, demonstrating an involvement of VPAC1/VPAC2 receptors in PIV development. Moreover, endothelium‐independent and ‐dependent vasodilator responses were unchanged by the VPAC1/VPAC2 antagonist. Thus, the absence of a PIV response following VPAC1/VPAC2 blockade cannot be explained by any dysfunction of the vascular smooth muscle or endothelial vasodilator capacity. The involvement of VPAC1/VPAC2 receptors in the development of PIV seems to imply a series relationship in which each receptor type (CGRP, VPAC1, VPAC2) is necessary for the full transmission of the response.

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Keywords

Male, Dose-Response Relationship, Drug, Receptors, Vasoactive Intestinal Polypeptide, Type I, Peptide Fragments, Rats, Vasodilation, Mice, Pressure, Animals, Receptors, Vasoactive Intestinal Peptide, Receptors, Vasoactive Intestinal Peptide, Type II, Rats, Wistar, Vasoactive Intestinal Peptide

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    popularity
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    Top 10%
    influence
    This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
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    This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
46
Top 10%
Top 10%
Top 10%
bronze