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- W2029248429 abstract "To characterize in vivo the high-affinity CB1 cannabinoid receptor (CB1R) selective anandamide analog AM1346 [alkoxyacid amide of N-eicosa-tetraenylamine] using drug discrimination. Substitution tests involved Δ9-tetrahydrocannabinol (Δ9-THC) and R-(+)-methanandamide (mAEA), a metabolically stable analog of anandamide (AEA), as well as the CB1R antagonist/inverse agonist rimonabant; d-amphetamine and morphine were also examined to assess pharmacological specificity. Rats were initially trained to discriminate between i.p.-injected vehicle and 3 mg/kg AM1346 (group 3 mg/kg; t′ = 20 min); subsequently, the rats were retrained with 5.6 mg/kg AM1346 (group 5.6 mg/kg; t′ = 20 min). Dose-generalization curves of AM1346, Δ9-THC, and mAEA suggested the following order of potency: Δ9-THC > AM1346 > mAEA both for rats discriminating between 3 and 5.6 mg/kg AM1346 from vehicle. In group 3 mg/kg, challenge by 1 mg/kg rimonabant resulted in parallel shifts to the right of the dose-generalization curves for Δ9-THC and AM1346, suggesting surmountable antagonism. Surmountable antagonism was not demonstrated with rimonabant–mAEA combinations. A long duration of effect was indicated when 3 mg/kg AM1346 was examined after different time intervals following i.p. administration (group 3 mg/kg). The in vivo half-life was close to 5 h. Neither d-amphetamine nor morphine generalized in either of groups 3 mg/kg and 5.6 mg/kg, suggesting pharmacological specificity. Unlike mAEA, the surmountable antagonism between rimonabant and AM1346 showed that the structural features of AEA can be modified to produce novel ligands that reduce the dissociation between the discriminative stimulus and rate decreasing effects of CB1R agonists derived from an AEA template." @default.
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- W2029248429 date "2008-06-03" @default.
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- W2029248429 title "Discriminative stimulus functions in rats of AM1346, a high-affinity CB1R selective anandamide analog" @default.
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- W2029248429 doi "https://doi.org/10.1007/s00213-008-1199-3" @default.
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