The amygdala is critical for opioid-mediated binge eating of fat.
Endogenous opioid peptides within the nucleus accumbens are thought to mediate the hedonic aspects of food intake, particularly foods such as fat and sugar. In view of evidence that the amygdala also regulates positive affect, we hypothesized this brain region participates in the control of opioid-mediated food intake. The robust increase in the intake of fat following intra-accumbens administration of the mu-opioid agonist D-Ala2,Nme-Phe4,Glyol5-enkephalin (DAMGO) was completely blocked by concurrent temporary inactivation (muscimol, GABA(A) agonist) of either the basolateral or central nucleus of the amygdala. In summary, we demonstrate that amygdala inactivation prevents the intra-accumbens opioid induced "binge" eating of fat, possibly through reducing the hedonic properties of high-fat palatable food.
Department of Psychiatry, University of Wisconsin-Madison, 6001 Research Park Blvd, Madison, WI 53719, USA. mjwill@wisc.edu
Matthew J
MJ
Will
Emily B
EB
Franzblau
Ann E
AE
Kelley
D000679:Amygdala / Q000033:anatomy & histology / Q000187:drug effects* / Q000502:physiology; D000701:Analgesics, Opioid / Q000008:administration & dosage / Q000494:pharmacology*; D000704:Analysis of Variance; D000818:Animals; D001522:Behavior, Animal; D002032:Bulimia / Q000503:physiopathology*; D004347:Drug Interactions; D020875:Enkephalin, Ala(2)-MePhe(4)-Gly(5)- / Q000008:administration & dosage / Q000494:pharmacology; D005223:Fats; D005247:Feeding Behavior / Q000187:drug effects* / Q000523:psychology; D018755:GABA Agonists / Q000494:pharmacology; D008297:Male; D008845:Microinjections / Q000379:methods; D009043:Motor Activity / Q000187:drug effects; D009118:Muscimol / Q000494:pharmacology; D009294:Narcotics / Q000494:pharmacology*; D016571:Neural Networks, Computer; D051381:Rats; D017207:Rats, Sprague-Dawley; D013997:Time Factors
D000701:Analgesics, Opioid; D005223:Fats; D018755:GABA Agonists; D009294:Narcotics; D020875:Enkephalin, Ala(2)-MePhe(4)-Gly(5)-; D009118:Muscimol