(a) Amphetamine-induced locomotor activity saline-treated animals
(b) Amphetamine-induced locomotor activity MAM-treated animals
(c) Postamphetamine average peak distance travelled
Figure 25: Repeated haloperidol treatment causes an enhancement in the locomotor response to D-amphetamine (0.5 mg/kg, i.p.) in SAL animals that is reduced by pretreatment with SH-053-2′F-R-CH3 (10 mg/kg, i.p.) (a). MAM rats treated repeatedly with haloperidol exhibit a locomotor response following D-amphetamine similar to untreated MAM rats. However, repeated haloperidol treatment blocks the effect of SH-053-2′F-R-CH3 pretreatment in decreasing the locomotor response in MAM rats (b). Untreated MAM rats demonstrated a significantly larger peak locomotor response than untreated SAL rats. In addition, SH-053-2′F-R-CH3 pretreatment significantly reduced the peak locomotor response in untreated MAM rats, while having no effect in repeatedly haloperidol-treated MAM rats. In contrast, repeated haloperidol treatment enhanced the peak locomotor response to amphetamine in SAL rats that was reduced by SH-053-2′F-R-CH3 pretreatment (c) [36, 38, 4761]. .