ISSN:
1432-2072
Keywords:
Key words BTCP
;
Cocaine
;
Prazosin
;
Monoamine re-uptake blocker
;
Norepinephrine
;
Dopamine
;
Drug discrimination
Source:
Springer Online Journal Archives 1860-2000
Topics:
Medicine
Notes:
Abstract Rationale: Although both cocaine and the phencyclidine analog, BTCP, have dopamine (DA) re-uptake blocking properties, under some conditions their behavioral effects can be differentiated. Therefore, we examined whether the discriminative stimulus (DS) effects of BTCP are different from those of cocaine. Objectives: To compare the effects of monoamine re-uptake blockers, varying in their in vitro potencies as inhibitors of DA, norepinephrine (NE), or serotonin re-uptake, in different groups of rats trained to discriminate either BTCP or cocaine from saline. Additionally, drugs from other pharmacological classes were tested in both groups. Methods: Rats were trained to discriminate either BTCP (5 mg/kg, i.p.) or cocaine (10 mg/kg, i.p.) from saline under a two-lever FR10 drug discrimination procedure. Results: BTCP and cocaine cross-substituted in BTCP- and cocaine-trained rats. The DA re-uptake blockers, mazindol, indatraline, methylphenidate, GBR12909, and GBR12935, occasioned dose-related drug-lever (DL) selection both in cocaine- and in BTCP-trained rats, with potencies that were significantly correlated. In contrast, the NE re-uptake blockers, nisoxetine, desipramine, and nortriptyline, produced higher levels of DL selection in BTCP-trained rats than in cocaine-trained rats, a profile like that reported in low-dose cocaine-trained rats. Drugs from other classes acted similarly in both discriminations. Further, the α1-adrenergic antagonist prazosin dose dependently blocked the DS effects of the training dose of BTCP, but not of cocaine. Conclusions: Theresults suggest that the DS effects of BTCP are similar to cocaine, and resemble those of a low training dose of cocaine.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/s002130051070
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