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Attenuation of spontaneous opiate withdrawal in mice by the anandamide transport inhibitor AM404
Abstract
The endogenous cannabinoid, anandamide, has been shown to attenuate naloxone-precipitated opiate withdrawal in rodents. Here we show that the spontaneous, but not the naloxone-precipitated withdrawal syndrome in morphine-dependent mice is attenuated by the inhibitor of carrier-mediated anandamide transport N-(4-hydroxyphenyl) arachidonylethanolamide (AM404) (2 and 10 mg/kg, i.p.). These results suggest that spontaneous but not opioid antagonist-precipitated withdrawal is associated with dynamic changes in endogenous cannabinoid signaling.
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