The role of the nucleus accumbens in sensitization to drugs of abuse.
1. Male rats received cannula implants above the nucleus accumbens for monitoring extracellular concentrations of dopamine via in vivo microdialysis. 2. Daily injections with cocaine led to an augmentation in both the behavioral response and the neurochemical response (i.e. cocaine-induced increase in extracellular dopamine within the nucleus accumbens) to this drug. 3. Pertussis toxin injections into the A10 region led to sensitized behavioral and neurochemical responses to an acute injection of cocaine. 4. Prior exposure to footshock stress augmented the cocaine-induced increase of motor activity and of extracellular dopamine within the nucleus accumbens. 5. These data suggest that treatments which lead to behavioral sensitization also lead to sensitization within the mesolimbic dopamine system as measured by an augmented dopamine release in the nucleus accumbens.
Steketee
J D
JD
Department of Veterinary and Comparative Anatomy, Washington State University, Pullman.
Sorg
B A
BA
Kalivas
P W
PW
D000818:Animals; D003042:Cocaine / Q000494:pharmacology; D003956:Dialysis; D004298:Dopamine / Q000378:metabolism; D004597:Electroshock; D005110:Extracellular Space / Q000187:drug effects / Q000378:metabolism; D008297:Male; D009043:Motor Activity / Q000187:drug effects; D009714:Nucleus Accumbens / Q000187:drug effects / Q000378:metabolism / Q000502:physiology*; D010433:Pentylenetetrazole / Q000494:pharmacology; D037342:Pertussis Toxin; D051381:Rats; D011919:Rats, Inbred Strains; D019966:Substance-Related Disorders / Q000503:physiopathology*; D010566:Virulence Factors, Bordetella / Q000494:pharmacology
D010566:Virulence Factors, Bordetella; D037342:Pertussis Toxin; D003042:Cocaine; D004298:Dopamine; D010433:Pentylenetetrazole