Abstract
Recent reports have suggested an involvement of the brain cannabinoid system in the morphine-reward pathway. To address this question we evaluated whether CB1 receptor knockout mice would show a conditioned place preference to morphine. CB1 receptor knockout mice developed a strong place preference to 4 and 8 mg/kg morphine, similar to that in wild-type Swiss–Webster mice. This data thus does not support a contribution of the brain cannabinoid system to morphine reward.
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