HTR2A, HTR2, 5-Hydroxytryptamine Receptor 2A, 5-Hydroxytryptamine (Serotonin) Receptor 2A, G Protein-Coupled, 5-Hydroxytryptamine (Serotonin) Receptor 2A, Serotonin 5-HT-2A Receptor, Serotonin Receptor 2A, 5-HT2 Receptor, 5-HT-2A, 5-HT2A, 5-HT-2, Receptor, Serotonin, 5-HT2A, 5HT2AR


5HT2AR is a g-protein coupled receptor for 5-hydroxytryptamine (serotonin). Also functions as a receptor for various drugs and psychoactive substances, including mescaline, psilocybin, 1-(2,5-dimethoxy-4-iodophenyl)-2-aminopropane (DOI) and lysergic acid diethylamide (LSD). Ligand binding causes a conformation change that triggers signaling via guanine nucleotide-binding proteins (G proteins) and modulates the activity of down-stream effectors. Beta-arrestin family members inhibit signaling via G proteins and mediate activation of alternative signaling pathways. Signaling activates phospholipase C and a phosphatidylinositol-calcium second messenger system that modulates the activity of phosphatidylinositol 3-kinase and promotes the release of Ca ions from intracellular stores. Affects neural activity, perception, cognition and mood. Plays a role in the regulation of behavior, including responses to anxiogenic situations and psychoactive substances. Plays a role in intestinal smooth muscle contraction, and may play a role in arterial vasoconstriction.Acts as a receptor for human JC polyomavirus/JCPyV.

KO Status

RenMab: F1 (+/-)

Drug Information

Launched drugs: 24
Drugs in clinical trials: 21
Latest Research Phase: Approved

Drug Name





Clinical Trials

Aripiprazole Lauroxil

RDC-3317, ALKS-9070, ALKS-9072


Alkermes Plc

Schizophrenia, Psychotic Disorders, Bipolar Disorder


AD-5423, DSP-5423, DSP-5423P


Sumitomo Dainippon Pharma Co Ltd


Pimavanserin Tartrate

ACP-103, BVF-048


Acadia Pharmaceuticals

Schizophrenia, Depressive Disorder, Major, Psychotic Disorders, Hallucinations, Parkinson Disease, Delusions, Alzheimer Disease, Neurodegenerative Diseases

Lurasidone Hydrochloride

SM-13496, SMP-13496, MK-3756


Sumitomo Dainippon

Schizophrenia, Depression, Depressive Disorder, Major, Bipolar Disorder, Psychotic Disorders, Autistic Disorder, Suicidal Ideation, Depressive Disorder


S-1991, Lu-23-174 (maleate)


Schizophrenia, Cognition

Pipamperone Hydrochloride



Mental Disorders


ALKS-7921, LY-170052, LY-170053


Eli Lilly And Company

Schizophrenia, Depression, Bipolar Disorder, Psychotic Disorders, Emergence Delirium, Vomiting, Nausea, Depressive Disorder, Treatment-Resistant, Borderline Personality Disorder, Fasting


HP-873, ILO-522, VYV-683


Novartis Pharma Ag

Schizophrenia, Bipolar Disorder, Hepatic Insufficiency


CP-018, ZX-003, R-64766, LY-03004, R-046766, R-064766, RBP-7000, TV-46000


Johnson & Johnson

Developmental Disabilities, Schizophrenia, Depressive Disorder, Major, Child Behavior Disorders, Rett Syndrome, Bipolar Disorder, Psychotic Disorders, Anxiety Disorders, Autistic Disorder, Dementia, Alzheimer Disease, Asperger Syndrome, Attention Deficit and Disruptive Behavior Disorders, Adenocarcinoma, Carcinoma, Non-Small-Cell Lung, Dementia, Vascular, Conduct Disorder, Fasting

Naftidrofuryl Oxalate

LS-121, EU-1806


Peripheral Vascular Diseases, Cerebrovascular Disorders





Cloning of the human serotonin 5-HT2 and 5-HT1C receptor subtypes

Saltzman A.G., Morse B., Whitman M.M., Ivanshchenko Y., Jaye M., Felder S.,

Biochem. Biophys. Res. Commun. 181:1469-1478(1991)

The human 5-HT2 receptor is encoded by a multiple intron-exon gene

Chen K., Yang W., Grimsby J., Shih J.C.,

Brain Res. Mol. Brain Res. 14:20-26(1992)

Primary structure of the human platelet serotonin 5-HT2A receptor: identify with frontal cortex serotonin 5-HT2A receptor

Cook E.H. Jr., Fletcher K.E., Wainwright M., Marks N., Yan S.Y., Leventhal B.L.,

J. Neurochem. 63:465-469(1994)

Complete sequencing and characterization of 21,243 full-length human cDNAs

Ota T., Suzuki Y., Nishikawa T., Otsuki T., Sugiyama T., Irie R., Wakamatsu A., Hayashi K., Sato H., Nagai K., Kimura K., Makita H., Sekine M., Obayashi M., Nishi T., Shibahara T., Tanaka T., Ishii S., Sugano S.,

Nat. Genet. 36:40-45(2004)

The DNA sequence and analysis of human chromosome 13

Dunham A., Matthews L.H., Burton J., Ashurst J.L., Howe K.L., Ashcroft K.J., Beare D.M., Burford D.C., Hunt S.E., Griffiths-Jones S., Jones M.C., Keenan S.J., Oliver K., Scott C.E., Ainscough R., Almeida J.P., Ambrose K.D., Andrews D.T., Ross M.T.,

Nature 428:522-528(2004)

The status, quality, and expansion of the NIH full-length cDNA project: the Mammalian Gene Collection (MGC)

The MGC Project Team,

Genome Res. 14:2121-2127(2004)

Genomic organization, coding sequence and functional expression of human 5-HT2 and 5-HT1A receptor genes

Stam N.J., van Huizen F., van Alebeek C., Brands J., Dijkema R., Tonnaer J.A., Olijve W.,

Eur. J. Pharmacol. 227:153-162(1992)

Interaction of serotonin 5-hydroxytryptamine type 2C receptors with PDZ10 of the multi-PDZ domain protein MUPP1

Becamel C., Figge A., Poliak S., Dumuis A., Peles E., Bockaert J., Luebbert H., Ullmer C.,

J. Biol. Chem. 276:12974-12982(2001)

The serotonin 5-HT2A and 5-HT2C receptors interact with specific sets of PDZ proteins

Becamel C., Gavarini S., Chanrion B., Alonso G., Galeotti N., Dumuis A., Bockaert J., Marin P.,

J. Biol. Chem. 279:20257-20266(2004)

Serotonin receptors

Nichols D.E., Nichols C.D.,

Chem. Rev. 108:1614-1641(2008)