Effects of indomethacin, endothelium-denudation, methylene blue and L-NG-monomethyl arginine on the vasoactive effects of endothelin-3.

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To clarify the mechanisms underlying the vasoactive effects of endothelin-3 (ET-3), we examined the effects of indomethacin, endothelium-denudation, methylene blue and L-N<SUP>G</SUP>-monomethyl arginine (L-NMMA) on the perfusion pressures of isolated rat mesenteric arteries infused with ET-3. ET-3 at 10<SUP>-15</SUP> 10<SUP>-8</SUP> M elicited significant vasodilations in a dose-related manner, in which 10<SUP>-9</SUP> and 10<SUP>-8</SUP> M ET-3 caused biphasic pressure changes involving a transient dilation and subsequent vasoconstriction. Five micromolar indomethacin did not affect the vasodilations and vasoconstrictions induced by ET-3. In endothelium-denuded arteries, 10<SUP>-13</SUP>-10<SUP>-8</SUP> M ET-3 elicited significant vasoconstriction in a dose-related manner without any vasodilation. In the presence of 30μM methylene blue, the vasodilations induced by ET-3 disappeared. In the presence of 100μM L-NMMA, 10<SUP>-15</SUP>-10<SUP>-8</SUP> M ET-3 elicited significant vasoconstrictions in a dose-related manner, and the vasodilation by ET-3 existed only at 10<SUP>-8</SUP>M ET-3. These data suggest that the vasodilating effects of low doses of ET-3 through the endothelium overcome the vasoconstricting effects, and that the vasodilating effects of ET-3 are associated with an endothelium-derived relaxing factor as an endothelium-derived nitric oxide.
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