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- W2138111574 abstract "Human adrenomedullin, a novel hypotensive peptide, contains a six-member ring structure similar to that found in calcitonin gene-related peptide and pancreatic amylin. Unlike the full-sequence peptide, human adrenomedullin-(15-22) [hADM-(15-22)], which contains the ring structure, increases systemic arterial pressure in the rat but not the cat. We undertook the present study to investigate the mechanism by which hADM-(15-22) increases systemic arterial pressure in the rat. Injection of hADM-(15-22) in doses of 10 to 300 nmol/kg i.v. increased systemic arterial pressure in a dose-dependent manner and was threefold less potent than norepinephrine when doses were compared on a nanomole basis. However, the ring structures of human calcitonin gene-related peptide and human amylin, human calcitonin gene-related peptide-(1-8) and human amylin-(1-8), respectively, had no significant effect on systemic arterial pressure in the rat. Pressor responses to hADM-(15-22) were reduced significantly after administration of phentolamine or reserpine. Responses to hADM-(15-22) were not altered by the angiotensin type 1 blocking agent DuP 753 or the endothelin-A/endothelin-B receptor blocking agent bosentan, and responses to hADM-(15-22) and the nicotinic agonist 1,1-dimethyl-4-phenylpiperazinium (DMPP) were reduced after bilateral adrenalectomy. Pressor responses to DMPP were reduced by hexamethonium, whereas the nicotinic blocking agent had no effect on the pressor response to hADM-(15-22). These data suggest that increases in systemic arterial pressure in response to hADM-(15-22) in the rat are mediated by the activation of alpha-adrenergic receptors by catecholamines released from the adrenal medulla. The present data suggest that hADM-(15-22) releases catecholamines from the adrenal medulla by a noncholinergic mechanism." @default.
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- W2138111574 date "1996-12-01" @default.
- W2138111574 modified "2023-09-25" @default.
- W2138111574 title "Catecholamine Release Mediates Pressor Effects of Adrenomedullin-(15-22) in the Rat" @default.
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- W2138111574 doi "https://doi.org/10.1161/01.hyp.28.6.1041" @default.
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