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Comparison of responses to adrenomedullin and adrenomedullin analogs in the mesenteric vascular bed of the cat

https://doi.org/10.1016/0014-2999(94)00693-2Get rights and content

Abstract

Responses to adrenomedullin, a newly discovered hypotensive peptide isolated from human pheochromocytoma cells, and the carboxy terminal 15–52 (adrenomedullin-(15–52)) and 22–52 (adrenomedullin-(22–52)) amino acid fragments of adrenomedullin were investigated in the mesenteric vascular bed of the cat. Under constant flow conditions, injections of adrenomedullin, adrenomedullin-(15–52), and calcitonin gene-related peptide (CGRP) in doses of 0.003–1 nmol into the perfused superior mesenteric artery caused significant dose-related decreases in mesenteric arterial perfusion pressure. Mesenteric vasodilator responses to adrenomedullin and adrenomedullin-(15–52) were similar in magnitude and duration, while vasodilator responses to CGRP were greater in magnitude and longer in duration than those produced by adrenomedullin or adrenomedullin-(15–52) when these agents were injected in doses of 0.1–1 nmol. Adrenomedullin-(22–52) caused no significant change in mesenteric arterial perfusion pressure when injected in doses up to 10 nmol. These results suggest that amino acids 15–52 and the six-membered ring structure of adrenomedullin are important for the expression of vasodilator activity in the mesenteric vascular bed of the cat.

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