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

Binge eating disorder (BED) is characterized by dysfunctional hedonic food intake and reward-related processes. Activation of the serotonin (5-HT) 5-HT receptor (5-HTR) suppresses both food intake and reward-related behaviors and is thus poised to regulate BED. This study assessed the effects of 5-HTR activation the selective 5-HTR 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-HTR activation suppresses the reinforcing and motivational properties of HFF, respectively. These findings suggest that activation of the 5-HTR may be effective at suppressing binge eating in patients with BED suppression of the reinforcing and motivational properties of HFF. This work supports future studies targeting the 5-HTR in the treatment of BED.