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Binge eating disorder (BED) is characterized by dysfunctional hedonic food intake and reward-related processes. Activation of the serotonin (5-HT) 5-HT 2C  receptor (5-HT 2C R) suppresses both food intake and reward-related behaviors and is thus poised to regulate BED. This study assessed the effects of 5-HT 2C R activation  via  the selective 5-HT 2C R agonist WAY163909 on binge eating-related behaviors in adult male Sprague-Dawley rats. Low doses of WAY163909 (1.0, 2.0 mg/kg) suppressed high-fat food (HFF) binge intake, but not standard food non-binge intake. WAY163909 (1.0 mg/kg) also attenuated operant responding for self-administered HFF pellets on fixed and progressive ratio schedules of reinforcement, indicating that 5-HT 2C R activation suppresses the reinforcing and motivational properties of HFF, respectively. These findings suggest that activation of the 5-HT 2C R may be effective at suppressing binge eating in patients with BED  via  suppression of the reinforcing and motivational properties of HFF. This work supports future studies targeting the 5-HT 2C R in the treatment of BED.

Serotonin 5-HT2C Receptor Activation Suppresses Binge Intake and the Reinforcing and Motivational Properties of High-Fat Food