Serotonin 5-HT1 receptor family (5-HT1) (5-HT1)

The Serotonin 5-HT1 receptor family is a group of five G protein-coupled receptors (5-HT1A, 5-HT1B, 5-HT1D, 5-HT1E, and 5-HT1F) that primarily signal through the inhibitory Gi/o pathway to decrease cyclic AMP levels [1, 6]. These receptors are widely distributed in the central nervous system, where they function as both presynaptic autoreceptors and postsynaptic heteroreceptors to modulate neuronal excitability and neurotransmitter release [1, 13, 18]. 5-HT1A receptors are key targets for anxiolytic and antidepressant drugs, while 5-HT1B, 5-HT1D, and 5-HT1F receptors are critical in the management of migraines through their effects on cranial blood vessels and trigeminal nerve signaling [1, 2, 5]. Dysregulation of this family is linked to various neuropsychiatric conditions, including major depressive disorder, generalized anxiety disorder, and schizophrenia [1, 12, 13]. Pharmacological modulation of these receptors is a cornerstone of modern neuropharmacology, though it requires careful management of side effects such as serotonin syndrome and potential cardiovascular risks associated with vasoconstriction [3, 4, 11]. While 5-HT1A, 1B, and 1D are well-characterized, 5-HT1E and 1F are increasingly recognized for their roles in neuroprotection and non-vasoconstrictive migraine relief, respectively [1, 6].

Other names

5-hydroxytryptamine 1 receptor family5-HT1 receptors5-HT1 receptor group

Activation of 5-HT1 receptors (agonism) triggers Gi/o protein signaling, which inhibits adenylyl cyclase activity and reduces intracellular cyclic AMP (cAMP) levels [1, 2, 6]. This signaling cascade typically leads to the opening of G protein-coupled inwardly rectifying potassium (GIRK) channels, causing neuronal hyperpolarization, and the inhibition of voltage-gated calcium channels, which reduces the release of neurotransmitters such as serotonin, glutamate, and acetylcholine [1, 13, 18]. In the vasculature, 5-HT1B/1D activation induces vasoconstriction of cranial blood vessels [1, 2, 5].