Figure 3: HINT1 mediates nicotine-induced hypomotility at low nicotine doses.
(a) Male HINT1 −/− mice are less sensitive to the locomotor depressant effects of nicotine compared with male HINT1 +/+ mice at the dose of 0.1 mg/kg. HINT1 −/− mice do not differ from +/+ counterparts at doses higher than 0.1 mg/kg. (b) Female HINT1 −/− mice are significantly less sensitive to the locomotor depressant effects of nicotine at 0.1 and 0.25 m/kg, but not at higher nicotine doses. Each point represents the mean ± SEM for 8–10 mice per group. * denotes P < 0.05 vs. corresponding +/+ group. ‘+ ’ denotes P < 0.05 vs. corresponding saline group for both genotypes. The x-axis represents nicotine doses administered and the y-axis represents the percentage of saline baseline.