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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

An NMDA antagonist (LY 235959) attenuates abstinence-induced withdrawal of planarians following acute exposure to a cannabinoid agonist (WIN 52212-2).

The mechanisms that facilitate the development and expression of cannabinoid physical dependence in humans and other mammals are poorly understood. The present experiments used a planarian model to provide evidence that pharmacological antagonism of NMDA receptors significantly attenuates the development of cannabinoid physical dependence. Abstinence-induced withdrawal from the cannabinoid agonist WIN 55212-2 (10 muM) was manifested as a significant (P<0.05) decrease in the rate of planarian spontaneous locomotor velocity (pLMV) when WIN 55212-2 (10 muM)-exposed planarians were placed into drug-free water. No change in pLMV occurred when WIN 55212-2 (10 muM)-exposed planarians were placed into water containing WIN 55212-2 (10 muM). WIN 55212-2 (10 muM)-exposed planarians placed into water containing LY 235959 (1 or 10 muM) did not display withdrawal (no significant difference, P>0.05, in pLMV). In addition, withdrawal was not observed (no significant difference, P>0.05, in pLMV) in planarians that were co-exposed to a solution containing WIN 55212-2 (10 muM) and LY 235959 (10 muM). The present results reveal that NMDA receptor activation mediates the development of cannabinoid physical dependence and the expression of cannabinoid withdrawal in planarians.[1]


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