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• W2066442810 abstract "Endogenous opioids, and in particular μ-opioid receptors, have been linked to hedonic and rewarding mechanisms engaged during palatable food intake. The aim of this study was to investigate the effects of GSK1521498, a novel μ-opioid receptor antagonist, on food-seeking behavior and on binge-like eating of a highly preferred chocolate diet. Food seeking was measured in rats trained to respond for chocolate under a second-order schedule of reinforcement, in which prolonged periods of food-seeking behavior were maintained by contingent presentation of a reward-associated conditioned reinforcer. After reaching a stable baseline in both procedures, animals were treated with GSK1521498 (0.1, 1, and 3 mg/kg; IP) or naltrexone (NTX, 0.1, 1, and 3 mg/kg; SC). The binge eating model was characterized by four temporally contiguous phases: 1-h chow access, 2-h food deprivation, 10-min chow access, and 10-min access to either chocolate-flavoured food or standard chow. During training the rats developed binge-like hyperphagia of palatable food and anticipatory chow hypophagia (anticipatory negative contrast). Both compounds reduced binge-like palatable food hyperphagia. However, GSK1521498 reduced the impact of high hedonic value on ingestion more specifically than NTX, abolishing anticipatory chow hypophagia. GSK1521498 also dose-dependently reduced food seeking both before and after food ingestion, whereas NTX reduced food seeking only after food ingestion. Thus, while both drugs affected the hedonic value of the preferred food, GSK1521498 also directly decreased incentive motivation for chocolate. Selective μ-opioid receptor antagonism by GSK1521498 may have utility as a treatment for reducing maladaptive, palatability-driven eating behavior by reducing the motivational properties of stimuli that elicit the binge eating commonly associated with obesity." @default.
• W2066442810 created "2016-06-24" @default.
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• W2066442810 date "2012-07-18" @default.
• W2066442810 modified "2023-10-16" @default.
• W2066442810 title "Inhibition of Opioid Transmission at the μ-Opioid Receptor Prevents Both Food Seeking and Binge-Like Eating" @default.
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• W2066442810 doi "https://doi.org/10.1038/npp.2012.128" @default.
• W2066442810 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/3473330" @default.
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