Abstract
N-[1-(2-Benzo( b)thiophenyl)cyclohexyl]piperidine (BTCP) and cocaine inhibit dopamine (DA) uptake but bind to different sites on the transporter. Their dose-dependent effects (i.p. administration) on extracellular DA levels in the rat striatum were measured by in vivo microdialysis. Both drugs dose-dependently increased DA levels with a maximum effect 60 min post injection. BTCP (20 mg/kg) had a greater peak effect than cocaine (40 mg/kg). For doses inducing similar behavioral effects (cocaine, 20 mg/kg; BTCP, 10 mg/kg) similar DA increases were observed in the striatum and the nucleus accumbens. Although both drugs bind on the DA transporter on different sites and induce different behavioral effects when administered chronically, their acute administration increased striatal DA level in a similar way.
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