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- W2145696340 abstract "Although the understanding of migraine pathophysiology is still incomplete, there seems to be little doubt that dilatation of cranial blood vessels, including meningeal arteries, is involved in the headache phase of migraine. Since calcitonin gene-related peptide (CGRP) has been implicated in this vasodilatation, the present study set out to compare the relaxant effects of the endogenous ligand h-alphaCGRP, and [ethylamide-Cys(2,7)]h-alphaCGRP ([Cys(Et)(2,7)]h-alphaCGRP), a CGRP(2) receptor agonist, on human isolated middle meningeal artery segments, precontracted with KCl. Classical Schild plot analysis was used to characterise the receptor population in this artery using BIBN4096BS and h-alphaCGRP(8-37) as antagonists. h-alphaCGRP relaxed arterial segments more potently than [Cys(Et)(2,7)]h-alphaCGRP (pEC(50): 8.51+/-0.16 and 7.48+/-0.24, respectively), while the maximal responses to these agonists were not significantly different. BIBN4096BS equipotently blocked the relaxations induced by both agonists with a pA(2) of approximately 10 and with a Schild plot slope not significantly different from unity. h-alphaCGRP(8-37) also antagonised the response to h-alphaCGRP with a pA(2) of 6.46+/-0.16 and a Schild plot slope not different from unity. Furthermore, the results obtained from RT-PCR studies confirmed the presence of all the essential components required for a functional CGRP(1) receptor in these arteries. Considering the high antagonist potency of BIBN4096BS, coupled to the lower agonist potency of [Cys (Et)(2,7)]h-alphaCGRP, it is reasonable to suggest a predominant role of CGRP(1) receptors in the human middle meningeal artery. This view is reinforced by Schild plot analysis, which revealed a slope of unity in all experiments, giving further evidence for a homogeneous CGRP receptor population in this vascular preparation." @default.
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- W2145696340 date "2006-06-01" @default.
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- W2145696340 title "Characterisation of CGRP receptors in the human isolated middle meningeal artery" @default.
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- W2145696340 doi "https://doi.org/10.1016/j.lfs.2006.01.003" @default.
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