The effect of endothelin-1 (ET-1) on the basilar arteries from control and subarachnoid hemorrhage (SAH) dogs were examined. The maximal contraction of the basilar artery in response to ET-1 was markedly decreased in the SAH group. Treatment with 10-8M phorbol 12-myri-state 13-acetate (PMA) reduced the contractile responses to ET-1 in the basilar arteries from control dogs. ET-1-induced contractions of the basilar arteries from control dogs were similar to those in strips from SAH dogs by the treatment with 10-8M PMA. Ca2+-induced contraction of the basilar arteries which were depolarized with isotonic K+(64nM) were significantly attenuated in SAH dogs. Treatment with PMA also reduced the contractile responses to Ca2+in the basilar arteries from control dogs. These results indicate that decreased contractile responses of the basilar arteries to ET-1 and Ca2+in the SAH group may be related to changes in the activity of the protein kinase C in vascular smooth muscle. © 1991.
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