Inhibition of periarterial nerve stimulation-induced vasodilation of the mesenteric arterial bed by CGRP (8-37) and CGRP receptor desensitization

Biochemical and Biophysical Research Communications
S P HanT C Westfall


We provide the first functional evidence that calcitonin gene-related peptide (8-37) induces a direct vasoconstriction and reversibly antagonizes vasodilation of the mesenteric arterial bed induced by calcitonin gene-related peptide (CGRP) suggesting that CGRP (8-37) is a competitive antagonist of vascular CGRP receptors. Vasodilation induced by periarterial nerve stimulation was inhibited both by CGRP (8-37) and by desensitization of CGRP receptors. These results further support the evidence that the periarterial nerve stimulation-induced nonadrenergic noncholinergic vasodilation of the mesenteric vasculature is mediated by endogenous CGRP and its receptors.


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