Human urotensin II-induced aorta ring contractions are mediated by protein kinase C, tyrosine kinases and Rho-kinase: inhibition by somatostatin receptor antagonists

European Journal of Pharmacology
W J RossowskiD H Coy

Abstract

Human urotensin II-(1-11) and its N-terminally shortened analogues, human urotensin II-(4-11)-OH and human urotensin II-(4-11)-NH2 are potent vasoconstrictor peptides in isolated rat thoracic aorta. Human urotensin II-induced tonic aorta ring contractions are inhibited by the Ca2+ channel antagonists, verapamil, nitrendipine and diltiazem; D609 (Tricyclodecan-9-yl-xanthogenate, K), selective inhibitor of phosphatidylcholine-specific phospholipase C and partially by phospholipase C inhibitor U-73122 [1-[6-((17ss-3 Methoxyestra-1,3,5(10)-trien-17-yl)amino)hexyl]-1H-pyrrole-25-dione] and a selective inhibitor of phosphatidyl-inositol-specific phospholipase C-ET-18-OCH3 (Edelfosine,1-O-octadecyl-2O-methyl-rac-glycero-3-phosphorylcholine); protein kinase C inhibitors, chelerythrine and NPC-15437 [S-2,6-diamino-N-[[1-(1-oxotridecyl)-2-piperidinyl]methyl]-hexanamide dihydrochloride]; tyrosine kinase inhibitors, genistein and tyrphostin B42 and Rho-kinase inhibitor HA-1077 [1-(5-isoquinolinylsulfonyl)-homopiperazine dihydrochloride]. This indicates that human urotensin II-induced tonic contractions of the rat aorta are mediated by phospholipase C, protein kinase C, tyrosine kinases and Rho-kinase related pathways. In the high K+ medium...Continue Reading

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