5-HT4 receptor

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5-HT4 receptor

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5-hydroxytryptamine (serotonin) receptor 4, G protein-coupled

Identifiers

Symbols

HTR4; 5-HT4; 5-HT4R

External IDs

OMIM: 602164 MGI: 109246 HomoloGene: 20243 IUPHAR: 5-HT₄ ChEMBL: 1875 GeneCards: HTR4 Gene

Gene Ontology
Molecular function	• signal transducer activity • receptor activity • G-protein coupled receptor activity • serotonin receptor activity • serotonin receptor activity
Cellular component	• membrane fraction • cytoplasm • endosome • plasma membrane • integral to plasma membrane • integral to membrane
Biological process	• G-protein coupled receptor signaling pathway • G-protein signaling, coupled to cyclic nucleotide second messenger • activation of adenylate cyclase activity by G-protein signaling pathway • serotonin receptor signaling pathway • serotonin receptor signaling pathway • gamma-aminobutyric acid signaling pathway • positive regulation of cell proliferation
Sources: Amigo / QuickGO

RNA expression pattern

More reference expression data

Orthologs

Species

Human

Mouse

RefSeq (mRNA)

RefSeq (protein)

Location (UCSC)

Chr 5:
147.83 – 148.06 Mb

Chr 18:
62.48 – 62.63 Mb

PubMed search

[1]

[2]

5-hydroxytryptamine receptor 4 is a protein that in humans is encoded by the HTR4 gene.^[1]^[2]

This gene is a member of the family of serotonin receptors, which are G protein coupled receptors that stimulate cAMP production in response to serotonin (5-hydroxytryptamine). The gene product is a glycosylated transmembrane protein that functions in both the peripheral and central nervous system to modulate the release of various neurotransmitters. Multiple transcript variants encoding proteins with distinct C-terminal sequences have been described, but the full-length nature of some transcript variants has not been determined.^[3]

Contents

1 Location
2 Isoforms
3 Ligands
- 3.1 Agonists
- 3.2 Antagonists
4 See also
5 References
6 External links
7 Further reading

Location

The receptor is located in the alimentary tract, urinary bladder, heart and adrenal gland as well as the central nervous system (CNS).^[4] In the CNS the receptor appears in the putamen, caudate nucleus, nucleus accumbens, globus pallidus and substantia nigra and to a lesser extent in the neocortex, raphe and pontine nuclei and some areas of the thalamus. It has not been found in the cerebellum.^[5]

Isoforms

Internalization is isoform-specific.^[6]

Ligands

Several drugs which act as 5-HT₄ selective agonists have recently been introduced into use in both scientific research and clinical medicine. Some drugs which act as 5-HT₄ agonists are also active as 5-HT₃ antagonists, such as mosapride, metoclopramide, renzapride and zacopride, and so these compounds cannot be considered highly selective. Research in this area is ongoing.^[7]

SB-207,145 radiolabeled with carbon-11 is used as a radioligand for 5-HT₄ in positron emission tomography pig^[8] and human^[9] studies.

Agonists

BIMU-8
Cisapride
CJ-033,466 - partial agonist
ML-10302^[10]
Mosapride
Prucalopride
Renzapride
RS-67506
RS-67333 - partial agonist
SL65.0155 - partial agonist
Tegaserod
Zacopride

Antagonists

Piboserod
GR-113,808 (1-methyl-1H-indole-3-carboxylic acid, [1-[2-[(methylsulfonyl)amino]ethyl]-4-piperidinyl]methyl ester)^[11]
GR-125,487
RS-39604 (1-[4-Amino-5-chloro-2-(3,5-dimethoxyphenyl)methyloxy]-3-[1-[2-methylsulphonylamino]piperidin-4-yl]propan-1-one)
SB-203,186
SB-204,070
([Methoxy-¹¹C]1-butylpiperidin-4-yl)methyl 4-amino-3-methoxybenzoate^[12]
Chamomile (ethanol extract)^[13]

References

^ Claeysen S, Faye P, Sebben M, Lemaire S, Bockaert J, Dumuis A, Taviaux S (December 1997). "Assignment of 5-hydroxytryptamine receptor (HTR4) to human chromosome 5 bands q31→q33 by in situ hybridization". Cytogenet Cell Genet 78 (2): 133–4. doi:10.1159/000134646. PMID 9371406.
^ , Blondel O, Vandecasteele G, Gastineau M, Leclerc S, Dahmoune Y, Langlois M, Fischmeister R (September 1997). "Molecular and functional characterization of a 5-HT4 receptor cloned from human atrium". FEBS Lett 412 (3): 465–74. doi:10.1016/S0014-5793(97)00820-X. PMID 9276448.
^ "Entrez Gene: HTR4 5-hydroxytryptamine (serotonin) receptor 4". http://www.ncbi.nlm.nih.gov/sites/entrez?Db=gene&Cmd=ShowDetailView&TermToSearch=3360.
^ S. S. Hegde; R. M. Eglen (1 October 1996). "Peripheral 5-HT4 receptors". The FASEB journal 10 (12): 1398–1407. PMID 8903510. http://www.fasebj.org/cgi/content/abstract/10/12/1398.
^ Katarina Varnäs; Christer Halldin; Victor W. Pike; Håkan Hall (2003). "Distribution of 5-HT₄ receptors in the postmortem human brain—an autoradiographic study using [¹²⁵]SB 207710". European Neuropsychopharmacology 13 (4): 228–234. doi:10.1016/S0924-977X(03)00009-9.
^ Mnie-Filali O, Amraei MG, Benmbarek S, et al. (March 2010). "Serotonin 4 receptor (5-HT4R) internalization is isoform-specific: effects of 5-HT and RS67333 on isoforms A and B". Cell. Signal. 22 (3): 501–9. doi:10.1016/j.cellsig.2009.11.004. PMID 19922792.
^ Pellissier LP, Sallander J, Campillo M, Gaven F, Queffeulou E, Pillot M, Dumuis A, Claeysen S, Bockaert J, Pardo L (April 2009). "Conformational toggle switches implicated in basal constitutive and agonist-induced activated states of 5-hydroxytryptamine-4 receptors". Molecular Pharmacology 75 (4): 982–90. doi:10.1124/mol.108.053686. PMID 19168624.
^ B. R. Kornum, N. M. Lind, N. Gillings, Lisbeth Marner, F. Andersen, Gitte Moos Knudsen (September 2008). "Evaluation of the novel 5-HT(4) receptor PET ligand [(11)C]SB207145 in the Gottingen minipig". Journal of Cerebral Blood Flow and Metabolism 29 (1): 186–96. doi:10.1038/jcbfm.2008.110. PMID 18797470.
^ Lisbeth Marner, Nic Gillings, Roger Gunn, Robert Comley, William Baaré, Steen Hasselbalch and Gitte Knudsen (1 May 2008). "Quantification of 11C-SB207145-PET for 5-HT4 receptors in the human brain: Preliminary results". Journal of Nuclear Medicine 48 (Supplement 2): 159P. http://jnumedmtg.snmjournals.org/cgi/content/meeting_abstract/48/MeetingAbstracts_2/159P.
^ Godínez-Chaparro B, Barragán-Iglesias P, Castañeda-Corral G, Rocha-González HI, Granados-Soto V (March 2011). "Role of peripheral 5-HT(4), 5-HT(6), and 5-HT(7) receptors in development and maintenance of secondary mechanical allodynia and hyperalgesia". Pain 152 (3): 687–97. doi:10.1016/j.pain.2010.12.020. PMID 21239110.
^ Gale, JD; Grossman, CJ; Whitehead, JW; Oxford, AW; Bunce, KT; Humphrey, PP (1994). "GR113808: a novel, selective antagonist with high affinity at the 5-HT4 receptor". British Journal of Pharmacology 111 (1): 332–8. PMC 1910004. PMID 8012715. //www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=1910004.
^ Xu R, Hong J, Morse CL, Pike VW (October 2010). "Synthesis, structure-affinity relationships, and radiolabeling of selective high-affinity 5-HT4 receptor ligands as prospective imaging probes for positron emission tomography". J. Med. Chem. 53 (19): 7035–47. doi:10.1021/jm100668r. PMC 2951497. PMID 20812727. //www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=2951497.
^ Simmen U, Kelber O, Okpanyi SN, Jaeggi R, Bueter B, Weiser D. "Binding of STW 5 (Iberogast) and its components to intestinal 5-HT, muscarinic M3, and opioid receptors."

External links

"5-HT₄". IUPHAR Database of Receptors and Ion Channels. International Union of Basic and Clinical Pharmacology. http://www.iuphar-db.org/GPCR/ReceptorDisplayForward?receptorID=2329.

Licht CL, 2009, Changes in the 5-HT₄ receptor in animal models of depression and antidepressant treatment, PhD thesis, University of Copenhagen.
Ullmer C, Schmuck K, Kalkman HO, Lübbert H (1995). "Expression of serotonin receptor mRNAs in blood vessels". FEBS Lett. 370 (3): 215–21. doi:10.1016/0014-5793(95)00828-W. PMID 7656980.
Blondel O, Vandecasteele G, Gastineau M, et al. (1997). "Molecular and functional characterization of a 5-HT4 receptor cloned from human atrium". FEBS Lett. 412 (3): 465–74. doi:10.1016/S0014-5793(97)00820-X. PMID 9276448.
Van den Wyngaert I, Gommeren W, Verhasselt P, et al. (1997). "Cloning and expression of a human serotonin 5-HT4 receptor cDNA". J. Neurochem. 69 (5): 1810–9. doi:10.1046/j.1471-4159.1997.69051810.x. PMID 9349523.
Claeysen S, Faye P, Sebben M, et al. (1997). "Cloning and expression of human 5-HT4S receptors. Effect of receptor density on their coupling to adenylyl cyclase". NeuroReport 8 (15): 3189–96. doi:10.1097/00001756-199710200-00002. PMID 9351641.
Blondel O, Gastineau M, Dahmoune Y, et al. (1998). "Cloning, expression, and pharmacology of four human 5-hydroxytryptamine 4 receptor isoforms produced by alternative splicing in the carboxyl terminus". J. Neurochem. 70 (6): 2252–61. doi:10.1046/j.1471-4159.1998.70062252.x. PMID 9603189.
Cichon S, Kesper K, Propping P, Nöthen MM (1998). "Assignment of the human serotonin 4 receptor gene (HTR4) to the long arm of chromosome 5 (5q31-q33)". Mol. Membr. Biol. 15 (2): 75–8. doi:10.3109/09687689809027521. PMID 9724925.
Claeysen S, Sebben M, Becamel C, et al. (1999). "Novel brain-specific 5-HT4 receptor splice variants show marked constitutive activity: role of the C-terminal intracellular domain". Mol. Pharmacol. 55 (5): 910–20. PMID 10220570.
Bender E, Pindon A, van Oers I, et al. (2000). "Structure of the human serotonin 5-HT4 receptor gene and cloning of a novel 5-HT4 splice variant". J. Neurochem. 74 (2): 478–89. doi:10.1046/j.1471-4159.2000.740478.x. PMID 10646498.
Mialet J, Berque-Bestel I, Eftekhari P, et al. (2000). "Isolation of the serotoninergic 5-HT4(e) receptor from human heart and comparative analysis of its pharmacological profile in C6-glial and CHO cell lines". Br. J. Pharmacol. 129 (4): 771–81. doi:10.1038/sj.bjp.0703101. PMC 1571890. PMID 10683202. //www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=1571890.
Bach T, Syversveen T, Kvingedal AM, et al. (2001). "5HT4(a) and 5-HT4(b) receptors have nearly identical pharmacology and are both expressed in human atrium and ventricle". Naunyn Schmiedebergs Arch. Pharmacol. 363 (2): 146–60. doi:10.1007/s002100000299. PMID 11218067.
Medhurst AD, Lezoualc'h F, Fischmeister R, et al. (2001). "Quantitative mRNA analysis of five C-terminal splice variants of the human 5-HT4 receptor in the central nervous system by TaqMan real time RT-PCR". Brain Res. Mol. Brain Res. 90 (2): 125–34. doi:10.1016/S0169-328X(01)00095-X. PMID 11406291.
Hiroi T, Hayashi-Kobayashi N, Nagumo S, et al. (2002). "Identification and characterization of the human serotonin-4 receptor gene promoter". Biochem. Biophys. Res. Commun. 289 (2): 337–44. doi:10.1006/bbrc.2001.5979. PMID 11716477.
Vilaró MT, Doménech T, Palacios JM, Mengod G (2002). "Cloning and characterization of a novel human 5-HT4 receptor variant that lacks the alternatively spliced carboxy terminal exon. RT-PCR distribution in human brain and periphery of multiple 5-HT4 receptor variants". Neuropharmacology 42 (1): 60–73. doi:10.1016/S0028-3908(01)00154-X. PMID 11750916.
López-Rodríguez ML, Murcia M, Benhamú B, et al. (2002). "Computational model of the complex between GR113808 and the 5-HT4 receptor guided by site-directed mutagenesis and the crystal structure of rhodopsin". J. Comput. Aided Mol. Des. 15 (11): 1025–33. doi:10.1023/A:1014895611874. PMID 11989623.
Ohtsuki T, Ishiguro H, Detera-Wadleigh SD, et al. (2003). "Association between serotonin 4 receptor gene polymorphisms and bipolar disorder in Japanese case-control samples and the NIMH Genetics Initiative Bipolar Pedigrees". Mol. Psychiatry 7 (9): 954–61. doi:10.1038/sj.mp.4001133. PMID 12399948.
Norum JH, Hart K, Levy FO (2003). "Ras-dependent ERK activation by the human G(s)-coupled serotonin receptors 5-HT4(b) and 5-HT7(a)". J. Biol. Chem. 278 (5): 3098–104. doi:10.1074/jbc.M206237200. PMID 12446729.
Strausberg RL, Feingold EA, Grouse LH, et al. (2003). "Generation and initial analysis of more than 15,000 full-length human and mouse cDNA sequences". Proc. Natl. Acad. Sci. U.S.A. 99 (26): 16899–903. doi:10.1073/pnas.242603899. PMC 139241. PMID 12477932. //www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=139241.
Cartier D, Lihrmann I, Parmentier F, et al. (2003). "Overexpression of serotonin4 receptors in cisapride-responsive adrenocorticotropin-independent bilateral macronodular adrenal hyperplasia causing Cushing's syndrome". J. Clin. Endocrinol. Metab. 88 (1): 248–54. doi:10.1210/jc.2002-021107. PMID 12519861.
Manzke T, Guenther U, Ponimaskin EG, et al. (2003). "5-HT4(a) receptors avert opioid-induced breathing depression without loss of analgesia". Science 301 (5630): 226–9. doi:10.1126/science.1084674. PMID 12855812.

This article incorporates text from the United States National Library of Medicine, which is in the public domain.

Cell surface receptor: G protein-coupled receptors

Class A:
Rhodopsin like

Neurotransmitter

Adrenergic	α1 (A B D) α2 (A B C) β1 β2 β3

Purinergic	Adenosine (A1 A2A A2B A3) P2Y (1 2 4 5 6 8 9 10 11 12 13 14)

Serotonin	(all but 5-HT3) 5-HT1 (A B D E F) 5-HT2 (A B C) 5-HT (4 5A 6 7)

Other	Acetylcholine (M1 M2 M3 M4 M5) Dopamine (D1 D2 D3 D4 D5) Histamine (H1 H2 H3 H4) Melatonin (1A 1B 1C) TAAR (1 2 3 5 6 8 9)

Metabolites and
signaling molecules

Eicosanoid	CysLT (1 2) LTB4 (1 2) FPRL1 OXE Prostaglandin (DP (1 2), EP (1 2 3 4), FP) Prostacyclin Thromboxane

Other	Bile acid Cannabinoid (CB1 CB2, GPR (18 55 119)) EBI2 Estrogen Free fatty acid (1 2 3 4) Lactate Lysophosphatidic acid (1 2 3 4 5 6) Lysophospholipid (1 2 3 4 5 6 7 8) Niacin (1 2) Oxoglutarate PAF Sphingosine-1-phosphate (1 2 3 4 5) Succinate

Peptide

Neuropeptide	B/W (1 2) FF (1 2) S Y (1 2 4 5) Neuromedin (B U (1 2)) Neurotensin (1 2)

Other	Anaphylatoxin (C3a C5a) Angiotensin (1 2) Apelin Bombesin (BRS3 GRPR NMBR) Bradykinin (B1 B2) Chemokine Cholecystokinin (A B) Endothelin (A B) Formyl peptide (1 2 3) FSH Galanin (1 2 3) GHB receptor Gonadotropin-releasing hormone (1 2) Ghrelin Kisspeptin Luteinizing hormone/choriogonadotropin MAS (1 1L D E F G X1 X2 X3 X4) Melanocortin (1 2 3 4 5) MCHR (1 2) Motilin Opioid (Delta Kappa Mu Nociceptin & Zeta, but not Sigma) Orexin (1 2) Oxytocin Prokineticin (1 2) Prolactin-releasing peptide Relaxin (1 2 3 4) Somatostatin (1 2 3 4 5) Tachykinin (1 2 3) Thyrotropin Thyrotropin-releasing hormone Urotensin-II Vasopressin (1A 1B 2)

Miscellaneous

Orphan	GPR (1 3 4 6 12 15 17 18 19 20 21 22 23 25 26 27 31 32 33 34 35 37 39 42 44 45 50 52 55 61 62 63 65 68 75 77 78 81 82 83 84 85 87 88 92 101 103 109A 109B 119 120 132 135 137B 139 141 142 146 148 149 150 151 152 153 160 161 162 171 173 174 176 177 182 183)

Other	Adrenomedullin Olfactory Opsin (3 4 5 1LW 1MW 1SW RGR RRH) Protease-activated (1 2 3 4) SREB (1 2 3)

Class B: Secretin like

Orphan	GPR (56 64 97 98 110 111 112 113 114 115 116 123 124 125 126 128 133 143 144 155 157)

Other	Brain-specific angiogenesis inhibitor (1 2 3) Cadherin (1 2 3) Calcitonin CALCRL CD97 Corticotropin-releasing hormone (1 2) EMR (1 2 3) Glucagon (GR GIPR GLP1R GLP2R) Growth hormone releasing hormone PACAPR1 GPR Latrophilin (1 2 3 ELTD1) Methuselah-like proteins Parathyroid hormone (1 2) Secretin Vasoactive intestinal peptide (1 2)

Class C: Metabotropic
glutamate / pheromone

Taste	TAS1R (1 2 3) TAS2R (1 3 4 5 8 9 10 12 13 14 16 19 20 30 31 38 39 40 41 42 43 45 46 50)

Other	Calcium-sensing receptor GABA B (1 2) Glutamate receptor (Metabotropic glutamate (1 2 3 4 5 6 7 8)) GPRC6A GPR (156 158 179) RAIG (1 2 3 4)

Class F:
Frizzled / Smoothened

Frizzled	Frizzled (1 2 3 4 5 6 7 8 9 10)

Smoothened	Smoothened

B trdu: iter (nrpl/grfl/cytl/horl), csrc (lgic, enzr, gprc, igsr, intg, nrpr/grfr/cytr), itra (adap, gbpr, mapk), calc, lipd; path (hedp, wntp, tgfp+mapp, notp, jakp, fsap, hipp, tlrp)

Serotonergics

5-HT₁ receptor ligands

5-HT_1A	Agonists: Azapirones: Alnespirone Binospirone Buspirone Enilospirone Eptapirone Gepirone Ipsapirone Perospirone Revospirone Tandospirone Tiospirone Umespirone Zalospirone; Antidepressants: Etoperidone Nefazodone Trazodone Vortioxetine; Antipsychotics: Aripiprazole Asenapine Clozapine Quetiapine Ziprasidone; Ergolines: Dihydroergotamine Ergotamine Lisuride Methysergide LSD; Tryptamines: 5-CT 5-MeO-DMT 5-MT Bufotenin DMT Indorenate Psilocin Psilocybin; Others: 8-OH-DPAT Adatanserin Bay R 1531 Befiradol BMY-14802 Cannabidiol Dimemebfe Ebalzotan Eltoprazine F-11,461 F-12,826 F-13,714 F-14,679 F-15,063 F-15,599 Flesinoxan Flibanserin Lesopitron LY-293,284 LY-301,317 MKC-242 Naluzotan NBUMP Osemozotan Oxaflozane Pardoprunox Piclozotan Rauwolscine Repinotan Roxindole RU-24,969 S 14,506 S-14,671 S-15,535 Sarizotan SSR-181,507 Sunepitron U-92,016-A Urapidil Vilazodone Xaliproden Yohimbine Antagonists: Antipsychotics: Iloperidone Risperidone Sertindole; Beta blockers: Alprenolol Cyanopindolol Iodocyanopindolol Oxprenolol Pindobind Pindolol Propranolol Tertatolol; Others: AV965 BMY-7,378 CSP-2503 Dotarizine Flopropione GR-46611 Isamoltane Lecozotan Mefway Metitepine/Methiothepin MPPF NAN-190 Robalzotan S-15535 SB-649,915 SDZ 216-525 Spiperone Spiramide Spiroxatrine UH-301 WAY-100,135 WAY-100,635 Xylamidine

5-HT_1B	Agonists: Lysergamides: Dihydroergotamine Ergotamine Methysergide; Piperazines: Eltoprazine TFMPP; Triptans: Avitriptan Eletriptan Sumatriptan Zolmitriptan; Tryptamines: 5-CT 5-MT; Others: CGS-12066A CP-93,129 CP-94,253 CP-135,807 RU-24,969 Vortioxetine Antagonists: Lysergamides: Metergoline; Others: AR-A000002 Elzasonan GR-127,935 Isamoltane Metitepine/Methiothepin SB-216,641 SB-224,289 SB-236,057 Yohimbine

5-HT_1D	Agonists: Lysergamides: Dihydroergotamine Methysergide; Triptans: Almotriptan Avitriptan Eletriptan Frovatriptan Naratriptan Rizatriptan Sumatriptan Zolmitriptan; Tryptamines: 5-CT 5-Ethyl-DMT 5-MT 5-(Nonyloxy)tryptamine; Others: CP-135,807 CP-286,601 GR-46611 L-694,247 L-772,405 PNU-109,291 PNU-142,633 Antagonists: Lysergamides: Metergoline; Others: Alniditan BRL-15,572 Elzasonan GR-127,935 Ketanserin LY-310,762 LY-367,642 LY-456,219 LY-456,220 Metitepine/Methiothepin Ritanserin Yohimbine Ziprasidone

5-HT_1E	Agonists: Lysergamides: Methysergide; Triptans: Eletriptan; Tryptamines: BRL-54443 Tryptamine Antagonists: Metitepine/Methiothepin

5-HT_1F	Agonists: Triptans: Eletriptan Naratriptan Sumatriptan; Tryptamines: 5-MT; Others: BRL-54443 Lasmiditan LY-334,370 Antagonists: Metitepine/Methiothepin

5-HT₂ receptor ligands


5-HT_2A	Agonists: Lysergamides: ALD-52 Ergometrine Lisuride LA-SS-Az LSD LSD-Pip Lysergic acid 2-butyl amide Lysergic acid 3-pentyl amide Methysergide; Phenethylamines: 25I-NBF 25I-NBMD 25I-NBOH 25I-NBOMe 2C-B 2C-B-FLY 2CB-Ind 2C-C-NBOMe 2C-E 2C-I 2C-TFM-NBOMe 2C-T-2 2C-T-7 2C-T-21 2CBCB-NBOMe 2CBFly-NBOMe Bromo-DragonFLY DOB DOC DOI DOM MDA MDMA Mescaline TCB-2 TFMFly; Piperazines: BZP Quipazine TFMPP; Tryptamines: 5-CT 5-MeO-α-ET 5-MeO-α-MT 5-MeO-DET 5-MeO-DiPT 5-MeO-DMT 5-MeO-DPT 5-MT α-ET α-Methyl-5-HT α-MT Bufotenin DET DiPT DMT DPT Psilocin Psilocybin; Others: AL-34662 AL-37350A Dimemebfe Medifoxamine O-4310 Oxaflozane PNU-22394 RH-34 Antagonists: Atypical antipsychotics: Amperozide Aripiprazole Carpipramine Clocapramine Clorotepine Clozapine Gevotroline Iloperidone Melperone Mosapramine Olanzapine Paliperidone Pimozide Quetiapine Risperidone Sertindole Ziprasidone Zotepine; Typical antipsychotics: Loxapine Pipamperone; Antidepressants: Amitriptyline Amoxapine Aptazapine Etoperidone Mianserin Mirtazapine Nefazodone Teniloxazine Trazodone; Others: 5-I-R91150 5-MeO-NBpBrT AC-90179 Adatanserin Altanserin AMDA APD-215 Blonanserin Cinanserin CSP-2503 Cyproheptadine Deramciclane Dotarizine Eplivanserin Esmirtazapine Fananserin Flibanserin Glemanserin Ketanserin KML-010 Lubazodone Mepiprazole Metitepine/Methiothepin Nantenine Pimavanserin Pizotifen Pruvanserin Rauwolscine Ritanserin S-14,671 Sarpogrelate Setoperone Spiperone Spiramide SR-46349B Volinanserin Xylamidine Yohimbine

5-HT_2B	Agonists: Oxazolines: 4-Methylaminorex Aminorex; Phenethylamines: Chlorphentermine Cloforex DOB DOC DOI DOM Fenfluramine (Dexfenfluramine, Levofenfluramine) MDA MDMA Norfenfluramine; Tryptamines: 5-CT 5-MT α-Methyl-5-HT; Others: BW-723C86 Cabergoline mCPP Pergolide PNU-22394 Ro60-0175 Antagonists: Agomelatine Asenapine EGIS-7625 Ketanserin Lisuride LY-272,015 Metitepine/Methiothepin PRX-08066 Rauwolscine Ritanserin RS-127,445 Sarpogrelate SB-200,646 SB-204,741 SB-206,553 SB-215,505 SB-221,284 SB-228,357 SDZ SER-082 Tegaserod Yohimbine

5-HT_2C	Agonists: Phenethylamines: 2C-B 2C-E 2C-I 2C-T-2 2C-T-7 2C-T-21 DOB DOC DOI DOM MDA MDMA Mescaline; Piperazines: Aripiprazole mCPP TFMPP; Tryptamines: 5-CT 5-MeO-α-ET 5-MeO-α-MT 5-MeO-DET 5-MeO-DiPT 5-MeO-DMT 5-MeO-DPT 5-MT α-ET α-Methyl-5-HT α-MT Bufotenin DET DiPT DMT DPT Psilocin Psilocybin; Others: A-372,159 AL-38022A CP-809,101 Dimemebfe Lorcaserin Medifoxamine MK-212 Org 12,962 ORG-37,684 Oxaflozane PNU-22394 Ro60-0175 Ro60-0213 Vabicaserin WAY-629 WAY-161,503 YM-348 Antagonists: Atypical antipsychotics: Clorotepine Clozapine Iloperidone Melperone Olanzapine Paliperidone Pimozide Quetiapine Risperidone Sertindole Ziprasidone Zotepine; Typical antipsychotics: Chlorpromazine Loxapine Pipamperone; Antidepressants: Agomelatine Amitriptyline Amoxapine Aptazapine Etoperidone Fluoxetine Mianserin Mirtazapine Nefazodone Nortriptyline Tedatioxetine Trazodone; Others: Adatanserin CEPC Cinanserin Cyproheptadine Deramciclane Dotarizine Eltoprazine Esmirtazapine FR-260,010 Ketanserin Ketotifen Latrepirdine Metitepine/Methiothepin Methysergide Pizotifen Ritanserin RS-102,221 S-14,671 SB-200,646 SB-206,553 SB-221,284 SB-228,357 SB-242,084 SB-243,213 SDZ SER-082 Xylamidine

5-HT₃
5-HT₄
5-HT₅
5-HT₆
5-HT₇ ligands


5-HT₃	Agonists: Piperazines: BZP Quipazine; Tryptamines: 2-Methyl-5-HT 5-CT; Others: Chlorophenylbiguanide Butanol Ethanol Halothane Isoflurane RS-56812 SR-57,227 SR-57,227-A Toluene Trichloroethane Trichloroethanol Trichloroethylene YM-31636 Antagonists: Antiemetics: AS-8112 Alosetron Azasetron Batanopride Bemesetron Cilansetron Dazopride Dolasetron Granisetron Lerisetron Ondansetron Palonosetron Ramosetron Renzapride Tropisetron Zacopride Zatosetron; Atypical antipsychotics: Clozapine Olanzapine Quetiapine; Tetracyclic antidepressants: Amoxapine Mianserin Mirtazapine; Others: CSP-2503 ICS-205,930 MDL-72,222 Memantine Nitrous Oxide Ricasetron Sevoflurane Tedatioxetine Thujone Tropanserin Vortioxetine Xenon

5-HT₄	Agonists: Gastroprokinetic Agents: Cinitapride Cisapride Dazopride Metoclopramide Mosapride Prucalopride Renzapride Tegaserod Velusetrag Zacopride; Others: 5-MT BIMU8 CJ-033,466 PRX-03140 RS-67333 RS-67506 SL65.0155 Antagonists: GR-113,808 GR-125,487 L-Lysine Piboserod RS-39604 RS-67532 SB-203,186 SB-204,070

5-HT_5A	Agonists: Lysergamides: Ergotamine LSD; Tryptamines: 5-CT; Others: Valerenic Acid Antagonists: Asenapine Latrepirdine Metitepine/Methiothepin Ritanserin SB-699,551 * Note that the 5-HT_5B receptor is not functional in humans.

5-HT₆	Agonists: Lysergamides: Dihydroergotamine Ergotamine Lisuride LSD Mesulergine Metergoline Methysergide; Tryptamines: 2-Methyl-5-HT 5-BT 5-CT 5-MT Bufotenin E-6801 E-6837 EMD-386,088 EMDT LY-586,713 N-Methyl-5-HT Tryptamine; Others: WAY-181,187 WAY-208,466 Antagonists: Antidepressants: Amitriptyline Amoxapine Clomipramine Doxepin Mianserin Nortriptyline; Atypical antipsychotics: Aripiprazole Asenapine Clorotepine Clozapine Fluperlapine Iloperidone Olanzapine Tiospirone; Typical antipsychotics: Chlorpromazine Loxapine; Others: BGC20-760 BVT-5182 BVT-74316 Cerlapirdine EGIS-12,233 GW-742,457 Ketanserin Latrepirdine Lu AE58054 Metitepine/Methiothepin MS-245 PRX-07034 Ritanserin Ro04-6790 Ro 63-0563 SB-258,585 SB-271,046 SB-357,134 SB-399,885 SB-742,457

5-HT₇	Agonists: Lysergamides: LSD; Tryptamines: 5-CT 5-MT Bufotenin; Others: 8-OH-DPAT AS-19 Bifeprunox E-55888 LP-12 LP-44 RU-24,969 Sarizotan Antagonists: Lysergamides: 2-Bromo-LSD Bromocriptine Dihydroergotamine Ergotamine Mesulergine Metergoline Methysergide; Antidepressants: Amitriptyline Amoxapine Clomipramine Imipramine Maprotiline Mianserin; Atypical antipsychotics: Amisulpride Aripiprazole Clorotepine Clozapine Olanzapine Risperidone Sertindole Tiospirone Ziprasidone Zotepine; Typical antipsychotics: Chlorpromazine Loxapine; Others: Butaclamol EGIS-12,233 Ketanserin LY-215,840 Metitepine/Methiothepin Pimozide Ritanserin SB-258,719 SB-258,741 SB-269,970 SB-656,104 SB-656,104-A SB-691,673 SLV-313 SLV-314 Spiperone SSR-181,507 Vortioxetine

Reuptake inhibitors

SERT	Selective serotonin reuptake inhibitors (SSRIs): Alaproclate Citalopram Dapoxetine Desmethylcitalopram Desmethylsertraline Escitalopram Femoxetine Fluoxetine Fluvoxamine Indalpine Ifoxetine Litoxetine Lubazodone Omiloxetine Panuramine Paroxetine Pirandamine RTI-353 Seproxetine Sertraline Vilazodone Vortioxetine Zimelidine; Serotonin-norepinephrine reuptake inhibitors (SNRIs): Bicifadine Desvenlafaxine Duloxetine Eclanamine Levomilnacipran Milnacipran Sibutramine Venlafaxine; Serotonin-norepinephrine-dopamine reuptake inhibitors (SNDRIs): Brasofensine Diclofensine DOV-102,677 DOV-21,947 DOV-216,303 NS-2359 SEP-225289 SEP-227,162 Tedatioxetine Tesofensine; Tricyclic antidepressants (TCAs): Amitriptyline Butriptyline Cianopramine Clomipramine Desipramine Dosulepin Doxepin Imipramine Lofepramine Nortriptyline Pipofezine Protriptyline Trimipramine; Tetracyclic antidepressants (TeCAs): Amoxapine; Piperazines: Nefazodone Trazodone; Antihistamines: Brompheniramine Chlorphenamine Diphenhydramine Mepyramine/Pyrilamine Pheniramine Tripelennamine; Opioids: Pethidine Methadone Propoxyphene; Others: Cocaine CP-39,332 Cyclobenzaprine Dextromethorphan Dextrorphan EXP-561 Fezolamine Mesembrine Nefopam PIM-35 Pridefine Roxindole SB-649,915 Tofenacin Ziprasidone

VMAT	Ibogaine Reserpine Tetrabenazine

Releasing agents

Aminoindanes: 5-IAI
AMMI
ETAI
MDAI
MDMAI
MMAI
TAI; Aminotetralins: 6-CAT
8-OH-DPAT
MDAT
MDMAT; Oxazolines: 4-Methylaminorex
Aminorex
Clominorex
Fluminorex; Phenethylamines (also Amphetamines, Cathinones, Phentermines, etc): 2-Methyl-MDA
4-CAB
4-FA
4-FMA
4-HA
4-MTA
5-APDB
5-Methyl-MDA
6-APDB
6-Methyl-MDA
AEMMA
Amiflamine
BDB
BOH
Brephedrone
Butylone
Chlorphentermine
Cloforex
Amfepramone
Metamfepramone
DCA
DFMDA
DMA
DMMA
EBDB
EDMA
Ethylone
Etolorex
Fenfluramine (Dexfenfluramine, Levofenfluramine)
Flephedrone
IAP
IMP
Iofetamine
Lophophine
MBDB
MDA
MDEA
MDHMA
MDMA
MDMPEA
MDOH
MDPEA
Mephedrone
Methedrone
Methylone
MMA
MMDA
MMDMA
MMMA
NAP
Norfenfluramine
4-TFMA
pBA
pCA
pIA
PMA
PMEA
PMMA
TAP; Piperazines: 2C-B-BZP
2-BZP
3-MeOPP
BZP
DCPP
MBZP
mCPP
MDBZP
MeOPP
Mepiprazole
pCPP
pFPP
pTFMPP
TFMPP; Tryptamines: 4-Methyl-αET
4-Methyl-αMT
5-CT
5-MeO-αET
5-MeO-αMT
5-MT
αET
αMT
DMT
Tryptamine (itself); Others: Indeloxazine
Tramadol
Viqualine

Enzyme inhibitors

Anabolism

TPH	AGN-2979 Fenclonine

AAAD	Benserazide Carbidopa Genistein Methyldopa

Catabolism

MAO

Nonselective: Benmoxin
Caroxazone
Echinopsidine
Furazolidone
Hydralazine
Indantadol
Iproclozide
Iproniazid
Isocarboxazid
Isoniazid
Linezolid
Mebanazine
Metfendrazine
Nialamide
Octamoxin
Paraxazone
Phenelzine
Pheniprazine
Phenoxypropazine
Pivalylbenzhydrazine
Procarbazine
Safrazine
Tranylcypromine; MAO-A Selective: Amiflamine
Bazinaprine
Befloxatone
Befol
Brofaromine
Cimoxatone
Clorgiline
Esuprone
Harmala alkaloids (Harmine
Harmaline
Tetrahydroharmine
Harman
Norharman, etc)
Methylene Blue
Metralindole
Minaprine
Moclobemide
Pirlindole
Sercloremine
Tetrindole
Toloxatone
Tyrima

Others

Precursors	L-Tryptophan → 5-HTP

Cofactors	Ferrous iron (Fe²⁺) Magnesium (Mg²⁺) Tetrahydrobiopterin Vitamin B₃ (Niacin Nicotinamide → NADPH) Vitamin B₆ (Pyridoxine Pyridoxamine Pyridoxal → Pyridoxal phosphate) Vitamin B₉ (Folic Acid → Tetrahydrofolic acid) Vitamin C (Ascorbic acid) Zinc (Zn²⁺)

Others	Activity enhancers: BPAP PPAP; Reuptake enhancers: Tianeptine

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