5-Hydroxytryptamine receptors in GtoPdb v.2025.1

Abstract

5-HT receptors (nomenclature as agreed by the NC-IUPHAR Subcommittee on 5-HT receptors [200] and subsequently revised [182]) are, with the exception of the ionotropic 5-HT₃ class, GPCRs where the endogenous agonist is 5-hydroxytryptamine. The diversity of metabotropic 5-HT receptors is increased by alternative splicing that produces isoforms of the 5-HT_2A (non-functional), 5-HT_2C (non-functional), 5-HT₄, 5-HT₆ (non-functional) and 5-HT₇ receptors. Unique amongst the GPCRs, RNA editing produces 5-HT_2C receptor isoforms that differ in function, such as efficiency and specificity of coupling to G_q/11 and also pharmacology [40, 499]. Most 5-HT receptors (except 5-ht_1e and 5-ht_5b) play specific roles mediating functional responses in different tissues (reviewed by [478, 394]).