Lorcaserin(APD356) is a selective full agonist of human 5-HT2C receptor with Ki of 15 nM.
IC50 value: 15 nM (Ki, Human 5-HT2c); 29 nM (Ki, Rat 5-HT2c)
Target: 5-HT2c receptor
in vitro: lorcaserin, a selective, high affinity 5-HT(2C) full agonist. Lorcaserin bound to human and rat 5-HT(2C) receptors with high affinity (K(i) = 15 +/- 1 nM, 29 +/- 7 nM, respectively), and it was a full agonist for the human 5-HT(2C) receptor in a functional inositol phosphate accumulation assay, with 18- and 104-fold selectivity over 5-HT(2A) and 5-HT(2B) receptors, respectively. Lorcaserin was also highly selective for human 5-HT(2C) over other human 5-HT receptors (5-HT(1A), 5-HT(3), 5-HT(4C), 5-HT5(5A), 5-HT(6), and 5-HT(7)), in addition to a panel of 67 other G protein-coupled receptors and ion channels. Lorcaserin did not compete for binding of ligands to serotonin, dopamine, and norepinephrine transporters, and it did not alter their function in vitro.
in vivo: Lorcaserin is potent in inhibiting rat acute food intake upon oral administration with ED50 of 18 mg/kg at 6 hr. Lorcaserin chronic administration to rats maintained on a high fat diet also produces dose-dependent reductions in food intake and body weight gain during the 4-week study. Lorcaserin (18 mg/kg) significantly increases resting and penile grooming, and has no effects on wet dog shakes, and back muscle contractions of rats. Short-term lorcaserin doses (0.3125-20 mg/kg) were administered in a counterbalanced order. Significant reduction of nicotine self-administration was achieved with all of the short-term doses in this range. Tests of lorcaserin on locomotor activity detected prominent sedative effects at doses greater than 1.25 mg/kg with more modest transient effects seen at 0.625 to 1.25 mg/kg. Long-term effects of lorcaserin on locomotor activity were tested with repeated injections with 0.625 mg/kg lorcaserin 10 times over 2 weeks.

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