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The histamine receptors are a class of G-protein coupled receptors with histamine as their endogenous ligand.

There are four known histamine receptors:

• The H₁ receptor
• The H₂ receptor
• The H₃ receptor
• The H₄ receptor

There are several splice variants of H3 present in various species. Though all of the receptors are 7-transmembrane g protein coupled receptors, H1 and H2 are quite different from H3 and H4 in their activities. H1 causes an increase in phosphoinositol hydrolysis, H2 stimulates gastric acid secretion, and H3 mediates feedback inhibition of histamine.

[edit] External links

• IUPHAR GPCR Database - Histamine Receptors
• MeSH Histamine+Receptor

v·d·e Transmembrane receptor: G protein-coupled receptors
Class A: Rhodopsin like	Acetylcholine (M1, M2, M3, M4, M5) - Adrenergic (α1 (A, B, D), α2 (A, B, C), β1, β2, β3) - Adrenomedullin - Anaphylatoxin (C3a, C5a) - Angiotensin (1, 2) - Apelin - Bile acid - Bombesin (BRS3, GRPR, NMBR) - Bradykinin (B1, B2) - Cannabinoid (CB1, CB2) - Chemokine - Cholecystokinin (A, B) - Dopamine (D1, D2, D3, D4, D5) - Eicosanoid (CysLT (1, 2), LTB4 (1, 2), FPRL1, OXE, Prostaglandin ((DP (1, 2), EP (1, 2, 3, 4), PGF, Prostacyclin, Thromboxane) - EBI2 - Endothelin (A, B) - Estrogen - Formyl peptide (1, L1, L2) - Free fatty acid (1, 2, 3, 4) - FSH - Galanin (1, 2, 3) - Gonadotropin-releasing hormone (1, 2) - 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, 79, 82, 83, 84, 85, 87, 88, 92, 101, 103, 119, 120, 132, 135, 139, 141, 142, 146, 148, 149, 150, 151, 152, 153, 160, 161, 162, 171, 172, 173, 174, 176, 182) - Ghrelin - Histamine (H1, H2, H3, H4) - Kisspeptin - Luteinizing hormone/choriogonadotropin - Lysophospholipid (1, 2, 3, 4, 5, 6, 7, 8) - MAS (1, 1L, D, E, F, G, X1, X2, X3, X4) - Melanocortin (1, 2, 3, 4, 5) - MCHR (1, 2) - Melatonin (1A, 1B)- Motilin - neuromedin (B, U (1, 2)) - Neuropeptide (B/W (1, 2), FF (1, 2), S, Y (1, 2, 4, 5)) - Neurotensin (1, 2) - Opioid (Delta, Kappa, Mu, Nociceptin, but not Sigma) - Olfactory - Opsin (3, 4, 5, 1LW, 1MW, 1SW, RGR, RRH) - Orexin (1, 2) - Oxytocin - Oxoglutarate - PAF - Prokineticin (1, 2) - Prolactin-releasing peptide - Protease-activated (1, 2, 3, 4) - Purinergics (Adenosine (A1, A2a, A2b, A3), P2Y, (1, 2, 4, 5, 6, 8, 9, 10, 11, 12, 13, 14)) - Relaxin (1, 2, 3, 4) - Somatostatin (1, 2, 3, 4, 5) - Serotonin, all but 5-HT3 (5-HT1 (A, B, D, E, F), 5-HT2 (A, B, C), 5-HT (4, 5A, 6, 7)) - SREB - Succinate - TAAR (1, 2, 3, 5, 6, 8, 9) - Tachykinin (1, 2, 3) - Thyrotropin - Thyrotropin-releasing hormone - Urotensin-II - Vasopressin (1A, 1B, 2)
Class B: Secretin like	Brain-specific angiogenesis inhibitor (1, 2, 3) - Cadherin (1, 2, 3) - Calcitonin - CD97 - Corticotropin-releasing hormone (1, 2) - EMR (1, 2, 3) - Glucagon (GR, GIPR, GLP1R, GLP2R) - Growth hormone releasing hormone - PACAPR1- GPR (56, 64, 97, 98, 110, 111, 112, 113, 114, 115, 116, 123, 124, 125, 126, 128, 133, 143, 144, 157) - Latrophilin (1, 2, 3, ELTD1) - Parathyroid hormone (1, 2) - Secretin - Vasoactive intestinal peptide (1, 2)
Class C: Metabotropic glutamate / pheromone	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) - Taste receptors (TAS1R (1, 2, 3) TAS2R (1, 3, 4, 5, 8, 9, 10, 12, 13, 14, 16, 38, 39, 40, 41, 43, 44, 45, 46, 47, 48, 49, 50))
Frizzled / Smoothened	Frizzled (1, 2, 3, 4, 5, 6, 7, 8, 9, 10) - Smoothened

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This page uses content from the English-language version of Wikipedia. The original article was at Histamine receptor. The list of authors can be seen in the page history. As with Psychology Wiki, the text of Wikipedia is available under the GNU Free Documentation License.