SC-53116: the first selective agonist at the newly identified serotonin 5-HT4 receptor subtype

Abstract

Serotonin acts as a neurotransmitter, neuromodulator, and hormone in mammals, and it is known to exhibit profound pharmacological activities in the central nervous system, autonomic nervous system, enteric nervous system, and cardiovascular system. Among monoamine neuro-transmitters, serotonin is unsurpassed in the number of receptor subtypes identified. Until recently, serotonin was thought to act through receptors subtyped as 5-HT1, 5-HT2, and 5-HT3. Furthermore, even these subtypes have been subclassed to now include 5-HT1A, 5-HT1B, 5-HTlc, 5-HT1D, 5-HT2A, 5-HT2B, and 5-HT3A ,5-HT3B ,and 5-HT33C.2