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- W2077315177 abstract "Although there are presently no highly selective agonists for the D3 dopamine receptor, a number of compounds reported to bind with moderate selectivity to D3 receptors are currently employed to investigate the importance of D3 receptors in the behavioral effects of psychostimulant drugs. For example, 7-hydroxy-N,N-di-n-propyl-2-aminotetralin (7-OH-DPAT) has been used extensively to investigate the role of D3 receptors in the reinforcing and discriminative stimulus properties of cocaine and d-amphetamine. However, recent investigations with a relatively selective D3 antagonist, PNU-99194A, have led us to question the importance of D3 receptors in the discriminative stimulus effects of 7-OH-DPAT. In the present study, 16 male Sprague-Dawley rats were trained to discriminate (+)-7-OH-DPAT (0.03 mg/kg, subcutaneously (s.c.)) from saline in a two-choice operant procedure using a fixed-ratio 20 schedule of water reinforcement. Consistent with previous findings, PNU-99194A appeared to attenuate only partially (+)-7-OH-DPAT discrimination at a dose that disrupted responding in most subjects. Moreover, a highly selective D2 agonist, PNU-91356A, substituted completely and in a dose-dependent manner for (+)-7-OH-DPAT, while d-amphetamine produced only partial substitution for the training drug. These data indicate that D2 receptor actions appear to be more important than D3 receptor actions in exerting the discriminative stimulus effects of (+)-7-OH-DPAT. Continued efforts to determine the relative importance of D2 vs D3 receptor actions in the modulation of the discriminative stimulus effects of (+)-7-OH-DPAT are discussed." @default.
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- W2077315177 date "1999-12-01" @default.
- W2077315177 modified "2023-09-27" @default.
- W2077315177 title "Assessment of D3 versus D2 receptor modulation of the discriminative stimulus effects of (+)-7-OH-DPAT in rats" @default.
- W2077315177 doi "https://doi.org/10.1097/00008877-199912000-00002" @default.
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