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- W1987103677 abstract "The effect of xanthone on smooth muscle was studied in thoracic aorta isolated from rats. Xanthone relaxed the norepinephrine-induced contraction of rat thoracic aorta. This relaxing effect of xanthone persisted in endothelium-denuded aorta suggesting that the relaxation induced by xanthone is endothelium-independent. The norepinephrine and high-K+-induced vasoconstriction was inhibited dose dependently in aorta pretreated with xanthone with IC50 values of 60.26 +/- 8.43 and 82.9 +/- 13.21 microM, respectively. The inositol 1,4,5-trisphosphate formation induced by norepinephrine (3 microM) in rat aorta was not affected by xanthone (10-100 microM), suggesting that the vasorelaxant effect of xanthone was not exerted on the receptor. Xanthone concentration dependently inhibited the 45Ca2+ influx induced by either norepinephrine or high-K+, suggesting that xanthone might act as a blocker of both receptor-operated and voltage-dependent Ca2+ channels. Furthermore, xanthone caused an increase in the level of intracellular cyclic adenosine 3',5'-monophosphate (cAMP), but not cyclic guanosine 3',5'-monophosphate (cGMP) content. These data suggested that the mechanism of xanthone-induced vasorelaxation might involve the increase of intracellular cyclic adenosine 3',5'-monophosphate (cAMP) content and block of Ca2+ channels." @default.
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- W1987103677 date "1997-10-01" @default.
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- W1987103677 title "Mechanism of vasorelaxation of thoracic aorta caused by xanthone" @default.
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- W1987103677 doi "https://doi.org/10.1016/s0014-2999(97)01224-7" @default.
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