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Involvement of K + channels in the relaxant effects of YC-1 in vascular smooth muscle
This study addresses the question whether K + channels are involved in the vasorelaxant effects of 3-(5′-hydroxymethyl-2′-furyl)-1-benzyl-indazole (YC-1 ). In rat aorta, guinea pig aorta, and guinea pig a. carotis, YC-1 inhibited contractions induced by phenylephrine (3 μM) more potently than those...
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Published in: | European journal of pharmacology 1999-10, Vol.382 (1), p.11-18 |
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Main Authors: | , , , , , , , , |
Format: | Article |
Language: | English |
Subjects: | |
Citations: | Items that this one cites Items that cite this one |
Online Access: | Get full text |
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Summary: | This study addresses the question whether K
+ channels are involved in the vasorelaxant effects of 3-(5′-hydroxymethyl-2′-furyl)-1-benzyl-indazole (YC-1 ). In rat aorta, guinea pig aorta, and guinea pig a. carotis, YC-1 inhibited contractions induced by phenylephrine (3 μM) more potently than those induced by K
+(48 mM). In rat aorta, tetraethylammonium (10 mM), charybdotoxin (0.2 μM), and iberiotoxin (0.1 μM), but not glibenclamide (10 μM), attenuated the relaxant effects of YC-1. In guinea pig a. carotis, YC-1 (30 μM) induced a hyperpolarisation which was antagonised by 1
H-[1,2,4]oxadiazolo[4,3-
a]quinoxalin-1-one (ODQ; 50 μM). In rat aorta, YC-1 (30 μM) increased the rate constant of
86Rb-efflux. The effect of YC-1 was potentiated by zaprinast (10 μM), but inhibited by ODQ (50 μM) or charybdotoxin (0.2 μM). In smooth muscle cells from rat aorta, YC-1 (10 μM) increased BK
Ca channel activity. It is suggested that YC-1-induced vasorelaxation is partially mediated by the activation of K
+ channels. |
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ISSN: | 0014-2999 1879-0712 |
DOI: | 10.1016/S0014-2999(99)00574-9 |