Limbic and motor circuitry underlying footshock-induced reinstatement of cocaine-seeking behavior

J Neurosci. 2004 Feb 18;24(7):1551-60. doi: 10.1523/JNEUROSCI.4177-03.2004.

Abstract

The role of limbic, cortical, and striatal circuitry in a footshock reinstatement model of relapse to cocaine seeking was evaluated. Transient inhibition of the central extended amygdala [CEA; including the central nucleus of the amygdala (CN), ventral bed nucleus of the stria terminalis (BNSTv), and nucleus accumbens shell (NAshell)], ventral tegmental area (VTA), and motor circuitry [including the dorsal prefrontal cortex (PFCd), nucleus accumbens core (NAcore), and ventral pallidum (VP)] blocked the ability of footshock stress to reinstate lever pressing previously associated with cocaine delivery. However, inhibition of the basolateral amygdala, mediodorsal nucleus of the thalamus, or the ventral prefrontal cortex had no effect on drug-seeking behavior. These data suggest that footshock stress activates limbic circuitry of the CEA that, via the VTA, activates motor output circuitry responsible for producing lever press responding. Consistent with this notion, the D1/D2 dopamine receptor antagonist fluphenazine blocked footshock-induced reinstatement when infused into the PFCd. Further, inhibition of the NAshell blocked a footshock-induced increase in dopamine within the PFC and concomitantly blocked reinstatement responding. Also supporting the idea of a CEA-VTA-motor circuit in stress-induced reinstatement of cocaine seeking, inactivation of the PFCd was shown to block stress-induced glutamate release within the NAcore while concurrently inhibiting reinstatement responding. Taken together, these data suggest that footshock activates limbic circuitry in the CEA, which in turn activates a VTA dopamine projection to the PFCd. The rise in dopamine within the PFCd initiates reinstatement via a glutamatergic projection to the NAcore.

Publication types

  • Research Support, U.S. Gov't, P.H.S.

MeSH terms

  • Amygdala / drug effects
  • Amygdala / physiopathology*
  • Animals
  • Cocaine / administration & dosage
  • Cocaine / pharmacology
  • Cocaine-Related Disorders / physiopathology*
  • Conditioning, Operant / drug effects
  • Conditioning, Operant / physiology
  • Disease Models, Animal
  • Dopamine / metabolism
  • Dopamine Antagonists / pharmacology
  • Efferent Pathways / drug effects
  • Efferent Pathways / physiopathology*
  • Electroshock*
  • GABA Agonists / pharmacology
  • Globus Pallidus / physiology
  • Glutamic Acid / metabolism
  • Limbic System / drug effects
  • Limbic System / physiology*
  • Male
  • Microinjections
  • Motor Activity / drug effects
  • Neostriatum / drug effects
  • Neostriatum / physiopathology
  • Neural Inhibition / drug effects
  • Neural Inhibition / physiology
  • Nucleus Accumbens / physiology
  • Prefrontal Cortex / drug effects
  • Prefrontal Cortex / physiopathology
  • Rats
  • Rats, Sprague-Dawley
  • Recurrence
  • Self Administration
  • Septal Nuclei / physiology
  • Ventral Tegmental Area

Substances

  • Dopamine Antagonists
  • GABA Agonists
  • Glutamic Acid
  • Cocaine
  • Dopamine