5-HT2 Receptors
Serotonin 5-HT2 receptors are a subfamily of 5-HT receptors which bind the neurotransmitter serotonin (5-hydroxytryptamine). Three subtypes have been identified: 5-HT2A, 5-HT2B and 5-HT2C.
Related Targets
5-HT Transporters (SERT) | 5-HT3 Receptors (5-HT3 Receptors) |
Non-selective 5-HT2 | View all 5-HT Receptors Small Molecules |
5-HT2A, 5-HT2B and 5-HT2C are are G-protein-coupled receptors that couple to Gq/11 causing activation of phospholipase C (PLC). PLC in turn hydrolyzes phosphatidylinositol (PIP2) to diacylglycerol (DAG) and inositol triphosphate (IP3).
5-HT2 Receptor Data
| Receptor Subtype | 5-HT2A | 5-HT2B | 5-HT2C |
|---|---|---|---|
| Transduction Mechanism | ↑ PLC (Gq/11) | ↑ PLC (Gq/11) | ↑ PLC (Gq/11) |
| Primary Distribution | Forebrain, caudate nucleus, nucleus accumbens, hippocampus, olfactory tubercle, vascular smooth muscle, blood platelets | Brain, stomach fundus (rat), gut, heart, kidney, lung | Choroid plexus, cortex, limbic system, basal ganglia |
| Function | Neuronal depolarization, head twitch, hyperthermia, modulation of neurotransmitter release smooth muscle contraction, platelet activation | Contraction of the stomach fundus, anxiety | Hypolocomotion, hypophagia, penile erection, hyperthermia, anxiety, ↓ noradrenalin and dopamine release |
| Selective Agonists | TCB-2 (2592) | BW 723C86 (1059) | MK 212 (0941) Ro 60-0175 (1854) SCH 23390 (0925) WAY 161503 (1801) WAY 629 (2173) CP 809101 (3041) 1-Methylpsilocin (3017) |
| Non-subtype Selective Agonists | PNU 22394 (2201)* α-methyl-5-hydroxytryptamine (0557) | PNU 22394 (2201)* α-methyl-5-hydroxytryptamine (0557) m-CPP (0875) | PNU 22394 (2201) α-methyl-5-hydroxytryptamine (0557) m-CPP (0875) |
| Selective Antagonists | R-96544 (1742) Spiperone (0995) 4F 4PP (0523) Risperidone (2865) Altanserin (1809) | SB 204741 (1372) LY 272015 (3077) | N-Desmethylclozapine (1007) RS 102221 (1050) SB 242084 (2901) |
| Non-subtype Selective Antagonists | Cyproheptadine (0996) MDL 11,939 (0870) Ritanserin (1955) | Cyproheptadine (0996) MDL 11,939 (0870) Ritanserin (1955) | Cyproheptadine (0996) MDL 11,939 (0870) Ritanserin (1955) |
*partial agonist
References
Hoyer et al (1994) VII. International union of pharmacology classification of receptors for 5-hydroxytryptamine (serotonin). Pharmacol. Rev. 46 157. Barnes and Sharp (1999) A review of central 5-HT receptors and their function. Neuropharmacol. 38 1083. Pauwels (2003) 5-HT receptors and their ligands. Tocris Reviews No. 25.