5-HT5A receptor

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AliasesHTR5A, 5-HT5A, 5-HT5A receptor, 5-hydroxytryptamine receptor 5A
External IDsOMIM: 601305 MGI: 96283 HomoloGene: 22461 GeneCards: HTR5A
RefSeq (mRNA)



RefSeq (protein)



Location (UCSC)Chr 7: 155.07 – 155.09 MbChr 5: 28.05 – 28.06 Mb
PubMed search[3][4]
View/Edit HumanView/Edit Mouse

5-Hydroxytryptamine (serotonin) receptor 5A, also known as HTR5A, is a protein that in humans is encoded by the HTR5A gene.[5][6] Agonists and antagonists for 5-HT receptors, as well as serotonin uptake inhibitors, present promnesic (memory-promoting) and/or anti-amnesic effects under different conditions, and 5-HT receptors are also associated with neural changes.


The gene described in this record is a member of 5-hydroxytryptamine receptor family and encodes a multi-pass membrane protein that functions as a receptor for 5-hydroxytryptamine and couples to G proteins, negatively influencing cAMP levels via Gi and Go.[7] This protein has been shown to function in part through the regulation of intracellular Ca2+ mobilization.[5] The 5-HT5A receptor has been shown to be functional in a native expression system.[8]

Rodents have been shown to possess two functional 5-HT5 receptor subtypes, 5-HT5A and 5-HT5B,[9] however while humans possess a gene coding for the 5-HT5B subtype, its coding sequence is interrupted by stop codons, making the gene non-functional, and so only the 5-HT5A subtype is expressed in human brain.[10]

It also appears to serve as a presynaptic serotonin autoreceptor.[11]

Clinical significance[edit]

The neurotransmitter serotonin (5-hydroxytryptamine, 5-HT) has been implicated in a wide range of psychiatric conditions and also has vasoconstrictive and vasodilatory effects.[5]

Selective ligands[edit]

Few highly selective ligands are commercially available for the 5-HT5A receptor. When selective activation of this receptor is desired in scientific research, the non-selective serotonin receptor agonist 5-Carboxamidotryptamine can be used in conjunction with selective antagonists for its other targets (principally 5-HT1A, 5-HT1B, 5-HT1D, and 5-HT7). Research in this area is ongoing.[12][13]



See also[edit]


  1. ^ a b c GRCh38: Ensembl release 89: ENSG00000157219 - Ensembl, May 2017
  2. ^ a b c GRCm38: Ensembl release 89: ENSMUSG00000039106 - Ensembl, May 2017
  3. ^ "Human PubMed Reference:". National Center for Biotechnology Information, U.S. National Library of Medicine.
  4. ^ "Mouse PubMed Reference:". National Center for Biotechnology Information, U.S. National Library of Medicine.
  5. ^ a b c "Entrez Gene: HTR5A 5-hydroxytryptamine (serotonin) receptor 5A".
  6. ^ Rees S, den Daas I, Foord S, Goodson S, Bull D, Kilpatrick G, Lee M (December 1994). "Cloning and characterisation of the human 5-HT5A serotonin receptor". FEBS Letters. 355 (3): 242–246. doi:10.1016/0014-5793(94)01209-1. PMID 7988681. S2CID 36425845.
  7. ^ Francken BJ, Jurzak M, Vanhauwe JF, Luyten WH, Leysen JE (November 1998). "The human 5-ht5A receptor couples to Gi/Go proteins and inhibits adenylate cyclase in HEK 293 cells". European Journal of Pharmacology. 361 (2–3): 299–309. doi:10.1016/S0014-2999(98)00744-4. PMID 9865521.
  8. ^ Goodfellow NM, Bailey CD, Lambe EK (April 2012). "The native serotonin 5-HT(5A) receptor: electrophysiological characterization in rodent cortex and 5-HT(1A)-mediated compensatory plasticity in the knock-out mouse". The Journal of Neuroscience. 32 (17): 5804–5809. doi:10.1523/JNEUROSCI.4849-11.2012. PMC 4644074. PMID 22539842.
  9. ^ Matthes H, Boschert U, Amlaiky N, Grailhe R, Plassat JL, Muscatelli F, et al. (March 1993). "Mouse 5-hydroxytryptamine5A and 5-hydroxytryptamine5B receptors define a new family of serotonin receptors: cloning, functional expression, and chromosomal localization". Molecular Pharmacology. 43 (3): 313–319. PMID 8450829.
  10. ^ Nelson DL (February 2004). "5-HT5 receptors". Current Drug Targets. CNS and Neurological Disorders. 3 (1): 53–58. doi:10.2174/1568007043482606. PMID 14965244.
  11. ^ Thomas DR, Soffin EM, Roberts C, Kew JN, de la Flor RM, Dawson LA, et al. (September 2006). "SB-699551-A (3-cyclopentyl-N-[2-(dimethylamino)ethyl]-N-[(4'-{[(2-phenylethyl)amino]methyl}-4-biphenylyl)methyl]propanamide dihydrochloride), a novel 5-ht5A receptor-selective antagonist, enhances 5-HT neuronal function: Evidence for an autoreceptor role for the 5-ht5A receptor in guinea pig brain". Neuropharmacology. 51 (3): 566–577. doi:10.1016/j.neuropharm.2006.04.019. PMID 16846620. S2CID 543423.
  12. ^ Wesołowska A (2002). "In the search for selective ligands of 5-HT5, 5-HT6 and 5-HT7 serotonin receptors" (PDF). Polish Journal of Pharmacology. 54 (4): 327–341. PMID 12523486.
  13. ^ Peters JU, Lübbers T, Alanine A, Kolczewski S, Blasco F, Steward L (January 2008). "Cyclic guanidines as dual 5-HT5A/5-HT7 receptor ligands: optimising brain penetration". Bioorganic & Medicinal Chemistry Letters. 18 (1): 262–266. doi:10.1016/j.bmcl.2007.10.078. PMID 18023344.
  14. ^ The RBI Handbook of Receptor Classification and Signal Transduction, page 114 (1995)ISBN 0-9640548-1-7
  15. ^ a b c d e Zhang S, Chen H, Zhang C, Yang Y, Popov P, Liu J, et al. (July 2022). "Inactive and active state structures template selective tools for the human 5-HT5A receptor". Nature Structural & Molecular Biology. 29 (7): 677–687. doi:10.1038/s41594-022-00796-6. PMC 9299520. PMID 35835867.
  16. ^ Dietz BM, Mahady GB, Pauli GF, Farnsworth NR (August 2005). "Valerian extract and valerenic acid are partial agonists of the 5-HT5a receptor in vitro". Brain Research. Molecular Brain Research. 138 (2): 191–197. doi:10.1016/j.molbrainres.2005.04.009. PMC 5805132. PMID 15921820.
  17. ^ Roth BL, Driscol J. "PDSP Ki Database". Psychoactive Drug Screening Program (PDSP). University of North Carolina at Chapel Hill and the United States National Institute of Mental Health. Retrieved 14 August 2017.
  18. ^ Ray TS (February 2010). "Psychedelics and the human receptorome". PLOS ONE. 5 (2): e9019. Bibcode:2010PLoSO...5.9019R. doi:10.1371/journal.pone.0009019. PMC 2814854. PMID 20126400.
  19. ^ US 6750221, Garcia-Ladona FJ, Szabo L, Steiner G, Hofmann HP, "Use of 5-HT5-ligands in the treatment of neurodegenerative and neuropsychiatric disturbances", published 2004-06-15 
  20. ^ a b c Yamazaki M, Okabe M, Yamamoto N, Yarimizu J, Harada K (March 2015). "Novel 5-HT5A receptor antagonists ameliorate scopolamine-induced working memory deficit in mice and reference memory impairment in aged rats". Journal of Pharmacological Sciences. 127 (3): 362–369. doi:10.1016/j.jphs.2015.02.006. PMID 25837935.
  21. ^ Yamazaki M, Harada K, Yamamoto N, Yarimizu J, Okabe M, Shimada T, et al. (October 2014). "ASP5736, a novel 5-HT5A receptor antagonist, ameliorates positive symptoms and cognitive impairment in animal models of schizophrenia". European Neuropsychopharmacology. 24 (10): 1698–1708. doi:10.1016/j.euroneuro.2014.07.009. PMID 25108314.
  22. ^ Wu J, Li Q, Bezprozvanny I (October 2008). "Evaluation of Dimebon in cellular model of Huntington's disease". Molecular Neurodegeneration. 3 (1): 15. doi:10.1186/1750-1326-3-15. PMC 2577671. PMID 18939977.

Further reading[edit]

External links[edit]

  • "5-ht5a". IUPHAR Database of Receptors and Ion Channels. International Union of Basic and Clinical Pharmacology.
  • Human HTR5A genome location and HTR5A gene details page in the UCSC Genome Browser.

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