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Relapse to Cocaine-Seeking After Hippocampal Theta Burst Stimulation
Stanislav R. Vorel,1*Xinhe Liu,2Robert J. Hayes,1Jordan A. Spector,1Eliot L. Gardner3
Treatment efforts for cocaine addiction are hampered by high
relapse rates. To map brain areas underlying relapse, we usedelectrical brain stimulation and intracranial injection of
pharmacologicalcompounds after extinction of cocaine
self-administration behaviorin rats. Electrical stimulation of the
hippocampus containingglutamatergic fibers, but not the medial
forebrain bundle containingdopaminergic fibers, elicited
cocaine-seeking behavior dependenton glutamate in the ventral
tegmental area. This suggests a rolefor glutamatergic
neurotransmission in relapse to cocaine abuse.The medial forebrain
bundle electrodes supported intense electricalself-stimulation. These
findings suggest a dissociation of neuralsystems subserving positive
reinforcement (self-stimulation) andincentive motivation (relapse).
1 Department of Neuroscience,
2 Department of Psychiatry and Behavioral Sciences,
Albert Einstein College of Medicine, Bronx, NY 10461, USA.
3 Intramural Research Program, National Institute on
Drug Abuse/National Institutes of Health, 5500 Nathan Shock Drive,
Baltimore, MD 21224, USA.
*
To whom correspondence should be addressed. E-mail:
robvorel{at}hotmail.com
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