The 5-HT2C receptor agonist, lorcaserin, and the 5-HT6 receptor antagonist, SB-742457, promote satiety; a microstructural analysis of feeding behaviour

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Colleges, School and Institutes


RATIONALE: Whilst the FDA-approved anorectic, lorcaserin and various 5-hydroxytryptamine (5-HT)6 receptor antagonists reduce feeding, a direct assessment of their impact upon feeding behaviour is less clear. We therefore examined the action of lorcaserin and the clinical-stage developmental candidate 5-HT6 receptor antagonist, SB-742457, upon microstructural analysis of licking behaviour. Such analysis provides a rich source of information about the mechanisms controlling food intake.

OBJECTIVES: The objective of the present study was to gain insight into the influence upon feeding behaviour of the 5-HT2C receptor agonist, lorcaserin and the developmental 5-HT6 receptor antagonist, SB-742457.

METHODS: The impact of lorcaserin and SB-742457 upon licking behaviour of non-deprived rats for a glucose solution was assessed using microstructural analysis.

RESULTS: Lorcaserin (0.1-3.0 mg/kg) displayed a dose-dependent ability to reduce glucose consumption via reduction in the number of bouts of licking. A similar action was evident with SB-742457, but only at the lowest dose tested (3.0 mg/kg).

CONCLUSIONS: The behavioural actions of both lorcaserin and SB-742457 demonstrate they directly promote satiety.


Original languageEnglish
Pages (from-to)417-424
Issue number3
Early online date28 Oct 2015
Publication statusPublished - Feb 2016


  • Lorcaserin, 5-HT2C receptor, 5-HT6 receptor, Obesity, Feeding behaviour, Microstructural analysis