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- W2209022177 abstract "Angiotensin II (ANG II) decreases blood pressure of fowl. To characterize the vasodilating action of ANG II and its underlying mechanisms, we examined the effect of [Asp1, Val5]ANG II (fowl ANG II) on isometric tension of fowl aortic rings. [Val5]ANG II (10(-8) to 10(-5) M) produced rapid, reversible, dose-dependent relaxation of aortas precontracted with phenylephrine. [Sar1,Ile8]ANG II blocked ANG II-induced relaxation; propranolol, atropine, methysergid, pyrilamine, and cimetidine did not. Endothelium removal abolished relaxation responses to ANG II and acetylcholine but not to isoproterenol or sodium nitroprusside. Inhibitors of phospholipase or arachidonic acid metabolism (quinacrine, indomethacin, 5,8,11,14-eicosatetraenoic acid, hydroquinone, metyrapone, SKF 525A) and a calcium channel blocker (verapamil) did not inhibit ANG II-induced relaxation, whereas indomethacin nearly completely blocked arachidonic acid-induced dilation of aortas with or without endothelia. Guanosine 3',5'-cyclic monophosphate (cGMP) levels in the aorta increased 15 s after ANG II application. Aortic relaxation was caused by 8-bromo-cGMP with or without intact endothelium. These results suggest that ANG II-induced relaxation of fowl aortas involves 1) an endothelium-dependent mechanism and 2) cGMP but not arachidonic acid metabolites." @default.
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- W2209022177 date "1988-10-01" @default.
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- W2209022177 title "Angiotensin II-induced relaxation of fowl aorta" @default.
- W2209022177 doi "https://doi.org/10.1152/ajpregu.1988.255.4.r591" @default.
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