Dopamine D1 and D2 antagonists reduce the acquisition and expression of flavor-preferences conditioned by fructose in rats.
The effects of dopamine (DA) D(1) and D(2) receptor antagonists on the acquisition and expression of flavor-preferences conditioned by the sweet taste of fructose were examined. Food-restricted rats were trained over eight alternating one-bottle sessions to drink an 8% fructose solution containing one novel flavor (CS+) and a less preferred 0.2% saccharin solution containing a different flavor (CS-). Three groups of rats were treated daily with either vehicle (control group), SCH23390 (200 nmol/kg; D(1) group), or raclopride (200 nmol/kg; D(2) group) during training. Additional groups of vehicle-treated rats had their daily training intakes matched to that of the D(1) and D(2) groups. Preferences were assessed in two-bottle tests with the CS+ and CS- flavors presented in 0.2% saccharin solutions following doses of 0, 50, 200, 400, or 800 nmol/kg of either D(1) or D(2) antagonists. The D(1) and D(2) groups, unlike the control and yoked-control groups, failed to display a significant CS+ preference in the two-bottle tests following vehicle treatment. In addition, treatment with SCH23390 prior to the two-bottle tests blocked the expression of the CS+ preference in the control groups. Pretest raclopride treatment attenuated the CS+ preference at some dose levels. Raclopride also attenuated the preference for fructose in rats given two-bottle training with the CS+/fructose (CS+/F) and CS-/saccharin (CS-/S) solutions. These findings indicate that D(1) and D(2) antagonists block flavor-preference conditioning by sweet taste and that D(1), and to a lesser extent D(2), receptor antagonists attenuate the expression of a previously acquired preference.
Baker
Robert M
RM
Neuropsychology Doctoral Subprogram, Department of Psychology, Queens College, City University of New York, 65-30 Kissena Boulevard, Flushing, New York, NY 11367, USA.
Shah
Mamta J
MJ
Sclafani
Anthony
A
Bodnar
Richard J
RJ
D000818:Animals; D001552:Benzazepines / Q000494:pharmacology; D003216:Conditioning, Operant / Q000187:drug effects*; D003864:Depression, Chemical; D018492:Dopamine Antagonists / Q000494:pharmacology*; D065127:Dopamine D2 Receptor Antagonists; D004305:Dose-Response Relationship, Drug; D004435:Eating / Q000187:drug effects; D005518:Food Preferences / Q000187:drug effects*; D005632:Fructose / Q000494:pharmacology*; D008297:Male; D020891:Raclopride / Q000494:pharmacology; D051381:Rats; D017447:Receptors, Dopamine D1 / Q000037:antagonists & inhibitors*; D012439:Saccharin / Q000494:pharmacology; D013649:Taste / Q000187:drug effects*
D001552:Benzazepines; D018492:Dopamine Antagonists; D065127:Dopamine D2 Receptor Antagonists; D017447:Receptors, Dopamine D1; D005632:Fructose; D020891:Raclopride; D012439:Saccharin