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Potentiation of anandamide hypotension by the transport inhibitor, AM404.


The putative endogenous cannabinoid, anandamide (0.2-2 mg/kg i.v.), decreased systemic blood pressure dose-dependently in anesthesized guinea pigs. These effects were prevented by the CB1 cannabinoid receptor antagonist SR141716A [N-(piperidin-1-yl)-5-(4-chlorophenyl)-1-(2,4-dichlorophenyl)-4-me thyl-1H-pyrazole-3-carboxamide x HCl] at the dose of 0.2 mg/kg i.v. The vasodepressor responses to anandamide were significantly potentiated and prolonged by a novel inhibitor of carrier-mediated anandamide transport, N-(4-hydroxyphenyl) arachidonylethanolamide (AM404) (10 mg/kg, i.v.). These results suggest that anandamide transport participates in terminating the vascular actions of anandamide.

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