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Comparative effects of adrenomedullin, an adrenomedullin analog, and CGRP in the pulmonary vascular bed of the cat and rat.

机译:肾上腺髓质素,肾上腺髓质素类似物和CGRP在猫和大鼠肺血管床中的比较作用。

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摘要

Responses to synthetic human adrenomedullin (ADM), a novel hypotensive peptide initially isolated from human pheochromocytoma cells, an ADM analog (ADM15-52), and a structurally related peptide, calcitonin gene-related peptide (CGRP), were compared in the pulmonary vascular bed of the cat and rat under constant flow conditions. When tone was increased with U46619, intraarterial injections of ADM (0.03-0.3 nmol), ADM15-52 (0.03-0.3 nmol), and of CGRP (0.03-0.3 nmol) caused dose-related decreases in pulmonary arterial perfusion pressure. When the relative vasodilator activity of the peptides was compared on a nmol basis, ADM was approximately 10-fold more potent in the cat than in the rat, whereas vasodilator responses to CGRP were very similar in both species. CGRP was slightly more potent than ADM in the rat, whereas ADM was slightly more potent than CGRP in the cat. ADM and ADM15-52 had similar pulmonary vasodilator activity in the cat, whereas the full sequence peptide was slightly more potent than ADM15-52 in the rat. The present data demonstrate that ADM has significant vasodilator activity in the pulmonary vascular beds of the cat and of the rat, and that the relative potency of the vasodilator effects of ADM and ADM15-52 are different in the two species.
机译:在肺血管中比较了对合成人肾上腺髓质素(ADM),最初从人嗜铬细胞瘤细胞分离的新型降压肽,ADM类似物(ADM15-52)和结构相关肽降钙素基因相关肽(CGRP)的反应。在恒定流量条件下的猫和老鼠的床。当使用U46619增强音调时,动脉内注射ADM(0.03-0.3 nmol),ADM15-52(0.03-0.3 nmol)和CGRP(0.03-0.3 nmol)会导致剂量相关的肺动脉灌注压力降低。当以nmol为基础比较肽的相对血管扩张活性时,ADM在猫中的效力比在大鼠中强约10倍,而在两种物种中对CGRP的血管扩张反应非常相似。在大鼠中,CGRP的效力比ADM略强,而在猫中,ADM的效力高于CGRP。在猫中,ADM和ADM15-52具有相似的肺血管扩张活性,而在大鼠中,全序列肽比ADM15-52的效力稍强。本数据表明,ADM在猫和大鼠的肺血管床中具有显着的血管舒张活性,并且在两种动物中ADM和ADM15-52的血管舒张作用的相对效力不同。

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