5-HT₂ Receptor

5-HT₂ receptors belong to the serotonin receptor family and comprise the 5-HT_2A, 5-HT_2B, and 5-HT_2C subtypes, which are predominantly coupled to G_q/11 signaling and regulate inositol phosphate production and intracellular calcium mobilization^[1][3]. These receptors mediate excitatory neurotransmission and participate in central nervous system functions including mood regulation, nociceptive processing, reward signaling, and behavioral responses^[1][4][2]. Mechanistically, 5-HT₂ receptor activation influences neuronal network activity through modulation of dopamine and serotonin pathways, with 5-HT_2A receptor activation enhancing dopaminergic signaling whereas 5-HT_2C receptor activation exerts opposing inhibitory effects on dopamine transmission^[5][6]. In disease-related models, dysregulation of 5-HT₂ signaling has been associated with psychiatric disorders, pain modulation, antidepressant responses, and substance-use behaviors^[4][2][5]. Compared with related isoforms, 5-HT_2A, 5-HT_2B, and 5-HT_2C receptors exhibit distinct pharmacological properties despite sharing common G-protein coupling mechanisms^[3][1]. This subtype selectivity is particularly important for experimental design because receptor-specific agonists and antagonists are widely used to dissect individual 5-HT₂ receptor functions and to characterize subtype-dependent physiological and pathological responses^[1][7].