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• W2166189575 abstract "The subtypes of nicotinic receptors at which the behavioural effects of nicotine originate are not fully understood. The experiments described here use mice lacking the alpha7 subunit of nicotinic receptors to investigate the role of alpha7-containing receptors in nicotine discrimination. Wild-type and alpha7-knockout mice were trained in a two-lever nicotine discrimination procedure using a tandem schedule of food reinforcement. Mutant mice exhibited baseline rates of lever-pressing as low as 52.2% of rates in wild-type controls (n=21-24). Mutant and wild-type mice acquired discrimination of nicotine (0.4 or 0.8 mg/kg) at a similar rate (n=10-12) and reached similar final levels of accuracy (71.9 +/- 4.4% and 90.8 +/- 3.1% after 60 training sessions for 0.4 and 0.8 mg/kg training doses, respectively, in mutant mice, as compared with 75.0 +/- 6.5% and 87.6 +/- 4.8% for wild types). The genotypes exhibited similar steep dose-response curves for nicotine discrimination. In both genotypes, dose-response curves for mice trained with 0.8 mg/kg of nicotine were displaced three- to four-fold to the right as compared with those for the mice trained with the smaller dose. The predominant effect of nicotine on the overall rate of responding was a reduction at the largest doses tested and there was no difference between the genotypes. The results suggest that nicotinic receptors containing the alpha7 subunit do not contribute to the discriminative stimulus or response-rate-depressant effects of nicotine, although they may regulate baseline rates of operant responding." @default.
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• W2166189575 date "2004-03-01" @default.
• W2166189575 modified "2023-10-14" @default.
• W2166189575 title "The role of nicotinic receptor α7 subunits in nicotine discrimination" @default.
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• W2166189575 doi "https://doi.org/10.1016/j.neuropharm.2003.10.002" @default.
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