5-hydroxytryptamine receptor 1A and 5-hydroxytryptamine receptor 2 (5-HT1A/2)

The 5-HT1A and 5-HT2 receptors are key subtypes of the serotonin (5-hydroxytryptamine) receptor family, both belonging to the G protein-coupled receptor (GPCR) superfamily. 5-HT1A is primarily an inhibitory receptor coupled to Gi/o proteins, widely expressed in the raphe nuclei as autoreceptors and in limbic regions as heteroreceptors, where it modulates anxiety, depression, and stress resilience [1.1.1, 1.2.4]. In contrast, the 5-HT2 family, particularly the 5-HT2A subtype, is generally excitatory and coupled to Gq/11 proteins, with high expression in the neocortex where it influences cognition, perception, and mood [1.1.3, 1.3.1]. The synergistic modulation of these receptors—often through 5-HT1A partial agonism and 5-HT2A antagonism—is a hallmark of atypical antipsychotics and certain antidepressants used to treat schizophrenia, bipolar disorder, and treatment-resistant depression [1.2.2, 1.2.5]. This dual targeting helps balance dopaminergic and serotonergic signaling, potentially improving cognitive symptoms and reducing the risk of extrapyramidal side effects [1.1.3, 1.5.4]. However, drugs affecting these receptors must be carefully managed due to risks such as serotonin syndrome, metabolic disturbances, and potential cardiovascular effects associated with 5-HT2B activation [1.5.2, 1.5.4].

Other names

Serotonin 1A and 2 receptors5-HT1A and 5-HT2 receptorsHTR1A and HTR2 family5-hydroxytryptamine 1A and 2 receptors

Combined 5-HT1A partial agonism and 5-HT2A antagonism to modulate serotonergic and dopaminergic neurotransmission.