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• W1977996859 abstract "Animals learn to prefer flavors associated with the intake of sugar (sucrose, fructose, glucose) and fat (corn oil: CO) solutions. Conditioned flavor preferences (CFP) have been elicited for sugars based on orosensory (flavor–flavor: e.g., fructose-CFP) and post-ingestive (flavor–nutrient: e.g., intragastric (IG) glucose-CFP) processes. Dopamine (DA) D1, DA D2 and NMDA receptor antagonism differentially eliminate the acquisition and expression of fructose-CFP and IG glucose-CFP. However, pharmacological analysis of fat (CO)-CFP, mediated by both flavor–flavor and flavor–nutrient processes, indicated that acquisition and expression of fat-CFP were minimally affected by systemic DA D1 and D2 antagonists, and were reduced by NMDA antagonism. Therefore, the present study examined whether systemic DA D1 (SCH23390), DA D2 (raclopride) or NMDA (MK-801) receptor antagonists altered acquisition and/or expression of CFP induced by oral glucose that should be mediated by both flavor–flavor and flavor–nutrient processes. Oral glucose-CFP was elicited following by training rats to drink one novel flavor (CS+, e.g., cherry) mixed in 8% glucose and another flavor (CS−, e.g., grape) mixed in 2% glucose. In expression studies, food-restricted rats drank these solutions in one-bottle sessions (2 h) over 10 days. Subsequent two-bottle tests with the CS+ and CS− flavors mixed in 2% glucose occurred 0.5 h after systemic administration of vehicle (VEH), SCH23390 (50–800 nmol/kg), raclopride (50–800 nmol/kg) or MK-801 (50–200 μg/kg). Rats displayed a robust CS+ preference following VEH treatment (94–95%) which was significantly though marginally attenuated by SCH23390 (67–70%), raclopride (77%) or MK-801 (70%) at doses that also markedly reduced overall CS intake. In separate acquisition studies, rats received VEH, SCH23390 (50–400 nmol/kg), raclopride (50–400 nmol/kg) or MK-801 (100 μg/kg) 0.5 h prior to ten 1-bottle training trials with CS+/8%G and CS−/2%G training solutions that was followed by six 2-bottle CS+ vs. CS− tests in 2% glucose conducted without injections. The significant and persistent CS+ preferences observed in the VEH (94–98%) group was significantly reduced by rats receiving SCH23390 at 400 nmol/kg (65–73%), raclopride at 200 or 400 nmol/kg (76–82%) or MK-801 at 100 μg/kg (68–69%). Thus, systemic DA D1 and DA D2 receptor antagonism produced smaller reductions in the expression of oral glucose-CFP relative to fructose-CFP or IG-glucose-CFP. Correspondingly, systemic DA D1, DA D2 and NMDA receptor antagonism also produced smaller reductions in the acquisition of oral glucose-CFP relative to fructose-CFP or IG-glucose-CFP. These data suggest, but do not prove, that the magnitude and persistence of these receptor antagonist effects upon sugar-CFP might depend upon the individual or combined engagement of flavor–flavor and flavor–nutrient processes." @default.
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• W1977996859 date "2014-10-01" @default.
• W1977996859 modified "2023-09-26" @default.
• W1977996859 title "Roles of NMDA and dopamine D1 and D2 receptors in the acquisition and expression of flavor preferences conditioned by oral glucose in rats" @default.
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• W1977996859 doi "https://doi.org/10.1016/j.nlm.2014.07.004" @default.
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