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14-September-2008 18:02:41 - receptor angiotensin II receptor, type 1 Identifiers Symbol AGTR1 Alt. Symbols AGTR1B Entrez 185 HUGO 336 OMIM 106165 RefSeq NM_000685 UniProt P30556 Other data Locus Chr. 3 q21-q25 angiotensin II receptor, type 2 Identifiers Symbol AGTR2 Entrez 186 HUGO 338 OMIM 300034 RefSeq NM_000686 UniProt P50052 Other data Locus Chr. X q22-q23 The angiotensin receptors are a class of G protein-coupled receptors with angiotensins as ligands.1 They are important in the renin-angiotensin system: they are responsible for the signal transduction of the main effector hormone.2 Contents 1 Structure 2 Members 2.1 Overview table 2.2 AT1 2.2.1 Mechanism 2.2.2 Effects 2.3 AT2 2.4 AT3 and AT4 3 See also 4 References 5 External links Structure The AT1 and AT2 receptors share a sequence identity of ~30%, but have a similar affinity for angiotensin II, which is their main ligand. Members Overview table Receptor Mechanism 3 AT1 Gq/11 Gi/o AT2 Gi2 / 3 AT3 AT4 AT1 Main article: Angiotensin II receptor type 1 The AT1 receptor is the best elucidated angiotensin receptor. Mechanism The angiotensin receptor is activated by the vasoconstricting peptide angiotensin II. The activated receptor in turn couples to Gq/11 and Gi/o and thus activates phospholipase C and increases the cytosolic Ca2+ concentrations, which in turn triggers cellular responses such as stimulation of protein kinase C. Activated receptor also inhibits adenylate cyclase and activates various tyrosine kinases.2 Effects Effects mediated by the AT1 receptor include vasoconstriction, aldosterone synthesis and secretion, increased vasopressin secretion, cardiac hypertrophy, augmentation of peripheral noradrenergic activity, vascular smooth muscle cells proliferation, decreased renal blood flow, renal renin inhibition, renal tubular sodium reuptake, modulation of central sympathetic nervous system activity, cardiac contractility, central osmocontrol and extracellular matrix formation.4 AT2 AT2 receptors are more plentiful in the fetus and neonate. Effects mediated by the AT2 receptor include inhibition of cell growth, fetal tissue development, modulation of extracellular matrix, neuronal regeneration, apoptosis, cellular differentiation and maybe vasodilation. AT3 and AT4 Other poorly characterized subtypes include the AT3 and AT4 receptors. The AT4 receptor is activated by the angiotensin II metabolite angiotensin IV, and may play a role in regulation of the CNS extracellular matrix. See also Angiotensin II receptor antagonist References ^ de Gasparo M, Catt KJ, Inagami T, Wright JW, Unger T 2000. International union of pharmacology. XXIII. The angiotensin II receptors. Pharmacol. Rev. 52 3: 415-72. PMID 10977869. ^ a b Higuchi S, Ohtsu H, Suzuki H, Shirai H, Frank GD, Eguchi S 2007. Angiotensin II signal transduction through the AT1 receptor: novel insights into mechanisms and pathophysiology. Clin. Sci. 112 8: 417-28. doi:10.1042/CS20060342. PMID 17346243. ^ Unless else specified in box, then ref is: Senselab ^ Catt KJ, Mendelsohn FA, Millan MA, Aguilera G 1984. The role of angiotensin II receptors in vascular regulation. J. Cardiovasc. Pharmacol. 6 Suppl 4: S575-86. PMID 6083400. External links IUPHAR GPCR Database - Angiotensin Receptors MeSH Receptors,+Angiotensin v d e Transmembrane receptor: G protein-coupled receptors Class A: Rhodopsin like Adrenergic α1 A, B, D, α2 A, B, C, β1, β2, β3 Eicosanoid CysLT 1, 2, LTB4 1, 2, FPRL1, OXE, Prostaglandin DP, EP 1, 2, 3, 4, PGF, Prostacyclin, Thromboxane Neuropeptide B/W 1, 2, FF 1, 2, S, Y 1, 2, 4, 5 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, 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, 177, 182 Purinergics 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 - 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 - 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 - 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 - 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 - Relaxin 1, 2, 3, 4 - Somatostatin 1, 2, 3, 4, 5 - 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 v d e Neuropeptide receptors Hypothalamic hormone receptors CRH - FSH - LHRH - TRH - Somatostatin Pituitary hormone receptors Vasopressin 1A, 1B, 2 - Oxytocin - LHCG - Type I cytokine receptor GH, Prolactin - TSH Other hormone receptors Atrial natriuretic factor - Calcitonin - Cholecystokinin A, B - VIP Opioid receptors Delta - Kappa - Mu - Sigma 1, 2 - Nociceptin Other neuropeptide receptors Angiotensin - Bradykinin B1, B2 / Tachykinin TACR1 - Calcitonin gene-related peptide - Galanin - GPCR neuropeptide B/W, FF, S, Y - Neurotensin Retrieved from http://en..org/wiki/Angiotensin_receptor Categories: Genes on chromosome 3 | Genes on chromosome X | Cell signaling | Signal transduction | G protein coupled receptorsHidden category: Protein pages needing a picture Views Article Discussion this page History Personal tools Log in / create account Navigation Main page Contents Featured content Current events Random article Search Go Search Interaction Community portal Recent changes Contact Donate to Help Toolbox What links here Related changes Upload file Special pages Printable version Permanent link Cite this page This page was last modified on 2 July 2008, at 11:12
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