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Psychopharmacology (Berl). 2002 Jan;159(3):284-93. Epub 2001 Oct 12.

Blockade or stimulation of D1 dopamine receptors attenuates cue reinstatement of extinguished cocaine-seeking behavior in rats.

Author information

1
Department of Psychology, Arizona State University, Box 871104, Tempe, AZ 85287-1104, USA.

Abstract

RATIONALE:

D(1) dopamine receptor antagonists and agonists attenuate cocaine reinstatement of cocaine-seeking behavior (i.e., responding in the absence of cocaine reinforcement).

OBJECTIVES:

The present study investigated the effects of a D(1) antagonist (SCH-23390), partial agonist (SKF-38393), and full agonist (SKF-81297) on reinstatement of cocaine-seeking behavior elicited by presentation of cocaine-paired cues.

METHODS:

Rats that had been trained to self-administer cocaine with a light/tone stimulus complex paired with each infusion underwent extinction across days. After responding diminished, rats were given response-contingent access to the cocaine-paired stimulus complex. The effects of SCH-23390 (0-10.0 microg/kg), SKF-38393 (0-3.0 mg/kg), and SKF-81297 (0-3.0 mg/kg) on cue reinstatement of cocaine-seeking behavior were examined. The ability of the two D(1) agonists to independently reinstate cocaine-seeking behavior and the effects of SKF-81297 on cocaine reinstatement were also examined. To investigate the possibility of behavioral interference, the effects of SKF-38393 and SKF-81297 on grooming and stereotypy were assessed.

RESULTS:

SCH-23390 and SKF-81297, but not SKF-38393, attenuated cue reinstatement. However, while SKF-81297 dose-dependently increased response latency, SCH-23390 did not. SKF-81297 also independently reinstated responding at the two lowest doses tested while SKF-38393 had no effect. Furthermore, SKF-81297 decreased cocaine reinstatement and increased response latency only at the highest dose. Finally, stereotypy was observed at all doses of SKF-81297 that also decreased responding, although the patterns of changes in these behaviors did not completely correspond.

CONCLUSIONS:

While the antagonist and full agonist produced similar effects on cocaine-seeking behavior, only the agonist increased response latency, suggesting that different processes mediate the effects of these drugs.

PMID:
11862361
DOI:
10.1007/s002130100904
[Indexed for MEDLINE]

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