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- Title
The selective dopamine D<sub>3</sub> receptor antagonists SB-277011A and NGB 2904 and the putative partial D<sub>3</sub> receptor agonist BP-897 attenuate methamphetamine-enhanced brain stimulation reward in rats.
- Authors
Spiller, Krista; Xi, Zheng-Xiong; Peng, Xiao-Qing; Newman, Amy; Ashby, Charles; Heidbreder, Christian; Gaál, József; Gardner, Eliot
- Abstract
We have previously reported that selective antagonism of brain D3 receptors by SB-277011A or NGB 2904 significantly attenuates cocaine- or nicotine-enhanced brain stimulation reward (BSR). In the present study, we investigated whether the selective D3 receptor antagonists SB-277011A and NGB 2904 and the putative partial D3 agonist BP-897 similarly reduce methamphetamine (METH)-enhanced BSR. Rats were trained to respond for rewarding electrical self-stimulation of the medial forebrain bundle. To assess the degree of drug-induced changes in BSR, a rate–frequency curve shift paradigm was used to measure brain-reward threshold ( θ 0). METH (0.1–0.65 mg/kg, i.p.) dose-dependently lowered (∼10–50%) BSR thresholds, producing an enhancement of BSR. Pretreatment with SB-277011A (12 mg/kg, but not 24 mg/kg, i.p.) significantly attenuated METH-enhanced BSR. NGB 2904 (0.1–1.0 mg/kg, but not 10 mg/kg) also attenuated METH-enhanced BSR. SB-277011A or NGB 2904 alone, at the doses tested, had no effect on BSR. Pretreatment with BP-897 (0.1–5 mg/kg) dose-dependently attenuated METH-enhanced BSR. However, when the dose was increased to 10 mg/kg, BP-897 shifted the stimulation–response curve to the right (inhibited BSR itself) in the presence or absence of METH. Selective antagonism of D3 receptors by SB-277011A or NGB 2904 attenuates METH-enhanced BSR in rats, while the METH-enhanced BSR attenuation produced by BP-897 may involve both D3 and non-D3 receptors. These findings support a potential use of selective D3 receptor antagonists for the treatment of METH addiction.
- Publication
Psychopharmacology, 2008, Vol 196, Issue 4, p533
- ISSN
0033-3158
- Publication type
Academic Journal
- DOI
10.1007/s00213-007-0986-6