Psychopharmacology

, Volume 168, Issue 1–2, pp 75–83

Electrical and chemical stimulation of the basolateral complex of the amygdala reinstates cocaine-seeking behavior in the rat

  • Robert J. Hayes
  • Stanislav R. Vorel
  • Jordan Spector
  • Xinhe Liu
  • Eliot L. Gardner
Original Investigation

Abstract

Rationale

The basolateral complex of the amygdala (BLC) is part of a neural circuit that is activated in humans during cocaine craving elicited by exposure to drug-related environmental cues. In animals, the BLC is necessary for cocaine-seeking behavior elicited by cocaine-associated cues. It has not been determined whether BLC activation is sufficient to reinstate cocaine seeking.

Objectives

To determine whether electrical or excitatory amino-acid stimulation of the BLC is sufficient to induce reinstatement of cocaine seeking in rats.

Methods

Rats were catheterized and trained to lever-press for intravenous cocaine infusions on a fixed ratio (FR)-1 schedule of reinforcement. Once baseline cocaine-taking criteria were met, lever-pressing behavior was extinguished by substitution of saline for cocaine. After meeting criteria for extinction, animals were subjected to brief electrical (20 Hz, 400 μA or 2 Hz, 400 μA; 200 pulses per stimulation) or N-methyl-d-aspartate (NMDA; 250 ng/0.5 μl) BLC stimulation and lever pressing behavior was monitored.

Results

Electrical BLC stimulation with 20-Hz produced reinstatement of lever pressing previously associated with cocaine self-administration, while 2-Hz stimulation did not. Electrical stimulation of cerebellar and medial forebrain bundle loci did not reinstate cocaine seeking. Hence, the reinstatement was frequency dependent and anatomically selective. NMDA microinjections into the BLC also reinstated cocaine-seeking behavior.

Conclusions

BLC stimulation is sufficient to reinstate cocaine-seeking behavior in the rat. These results are congruent with the hypothesis that the basolateral complex of the amygdala is part of a neural system mediating drug-seeking behavior.

Keywords

Addiction Amygdala Cocaine Craving Excitatory amino acid Relapse Reinstatement Self-administration Stimulation 

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Copyright information

© Springer-Verlag 2003

Authors and Affiliations

  • Robert J. Hayes
    • 1
    • 2
  • Stanislav R. Vorel
    • 1
    • 2
  • Jordan Spector
    • 1
  • Xinhe Liu
    • 3
  • Eliot L. Gardner
    • 2
  1. 1.Department of NeuroscienceAlbert Einstein College of MedicineUSA
  2. 2.Intramural Research ProgramNational Institute on Drug Abuse, National Institutes of Health, Department of Health and Human ServicesBaltimoreUSA
  3. 3.Department of PsychiatryAlbert Einstein College of MedicineUSA

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