Reversible inactivation of the basolateral amygdala, but not the dorsolateral caudate putamen, attenuates consolidation of cocaine-cue associative learning in a reinstatement model of drug-seeking.
Previous research has shown that the basolateral amygdala (BLA) mediates stimulus-reward learning, including drug-cue associations, whereas the dorsolateral caudate putamen (dlCPu) primarily mediates stimulus-response (habit) learning. Recent evidence has indicated that the dlCPu may be critical in cocaine-seeking following extended self-administration, but it remains unknown whether the dlCPu plays a role in the early formation of drug-cue associations. The current study used a model of Pavlovian learning to compare the roles of the BLA and dlCPu in the consolidation of cocaine-cue associations that maintain cocaine-seeking during cue-induced reinstatement. Male Sprague-Dawley rats self-administered cocaine (0.2 mg/ 50μL infusion, i.v.) in the absence of cues for 6 days (2 h/day). Immediately following a single 1-h classical conditioning session in which passive cocaine infusions were paired with a light/tone cue, animals received bilateral infusions of the GABA receptor agonists, baclofen/muscimol (1.0/0.1 mm), or vehicle into the BLA or dlCPu. Following additional cocaine self-administration (5 days) and subsequent extinction (no cocaine or cues, 7 days), the ability of the previously cocaine-paired cues to reinstate cocaine-seeking was assessed. Inactivation of the BLA, but not the dlCPu, immediately following the classical conditioning session impaired the consolidation of cocaine-cue associations as seen by decreased cue-induced reinstatement. These results extend previous findings that the BLA mediates the consolidation of learned associations that drive cocaine-seeking during subsequent reinstatement and indicate that the dlCPu does not play a role during initial stimulus-drug associative learning.
Gabriele
Amanda
A
Department of Neurosciences, Medical University of South Carolina, 173 Ashley Avenue, Charleston, SC 29425, USA.
See
Ronald E
RE
D000679:Amygdala / Q000187:drug effects / Q000502:physiology*; D000818:Animals; D001245:Association Learning / Q000187:drug effects / Q000502:physiology*; D016739:Behavior, Addictive / Q000503:physiopathology / Q000523:psychology*; D002421:Caudate Nucleus / Q000187:drug effects / Q000502:physiology*; D003042:Cocaine / Q000008:administration & dosage*; D003214:Conditioning, Classical / Q000187:drug effects / Q000502:physiology; D003463:Cues; D008297:Male; D023421:Models, Animal; D011699:Putamen / Q000187:drug effects / Q000502:physiology*; D051381:Rats; D017207:Rats, Sprague-Dawley; D012646:Self Administration
D003042:Cocaine
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