Metabotropni glutamatni receptor 5 je protein koji je kod ljudi kodiran GRM5genom.[1][2]
Funkcija
Aminokiselina L-glutamat je glavni ekscitatorni neurotransmiter u centralnom nervnom sistemu koji aktivira jonotropne i metabotropneglutamatne receptore. Glutamatergična neurotransmisija učestvuje u većini aspekata normalnih moždanih funkcija. Ona može da bude poremećena u mnogim neuropatološkim oboljenjima. Metabotropni glutamatni receptori su familija G protein spregnutih receptora, koja se deli u tri grupe na osnovu homologije sekvence, mehanizma prenosa signala, i farmakoloških svojstava. Grupa I obuhvata GRM1 i GRM5. Ovi receptori aktiviraju fosfolipazu C. Grupa II obuhvata GRM2 i GRM3, dok su u grupi III GRM4, GRM6, GRM7, i GRM8. Receptori grupe II i III su vezani za inhibiciju kaskade cikličnog AMP-a ali se razlikuju u njihovim selektivnostima za agoniste. Alternativne splajsne varijante GRM8 su poznate, ali njihova svojstava nisu potpuno određena.[2]
Ligandi
Osim ortosternog mesta (mesta gde se endogeni ligand, glutamat, vezuje) najmanje dva različita alosternamesta vezivanja postoje na mGluR5 receptoru.[3] Znatan broj potentnih i selektivnih mGluR5 liganda je razvijen.[4] Selektivni antagonisti i negativni alosterni modulatori mGluR5 receptora su oblast od posebnog interesa za farmaceutska istraživanja, usled njihove demonstrirane anksiolitičkie, antidepresivne i antizavisničke[5][6][7] uloge u životinjskim studijama i njihovog relativno benignog bezbednostnog profila.[8][9] mGluR5 receptori su isto tako izraženi izvan centralnog nervnog sistema, i za mGluR5 antagoniste je pokazano da su hepatoprotektivni i da mogu da budu korisni u tretmanu inflamacije i neuropatičkog bola.[10][11] Klinička upotreba ovih lekova može da bude ograničena usled nuspojava kao što su amnezija i psihotomimetički simptomi,[12][13][14][15] mada one mogu da bude prednost za pojedine indikacije.[16] mGluR5 pozitivni modulatori mogu da imaju nootropne efekte.[17]
Miševi bez mGluR5 gena pokazuju nedostatak kokainske samoadministracije nezavisno od doze.[25] Iz toga proizilazi da ovaj receptor učestvuje u svojstvu nagrađivanja kokainom. Međutim, kasnije studije su pokazale da mGluR5 nokaut miševi delimično odgovaraju na kokain.[26]
^Minakami R, Katsuki F, Yamamoto T, Nakamura K, Sugiyama H (1994). „Molecular cloning and the functional expression of two isoforms of human metabotropic glutamate receptor subtype 5”. Biochem Biophys Res Commun. 199 (3): 1136—43. PMID7908515. doi:10.1006/bbrc.1994.1349.
^Chen Y, Goudet C, Pin JP, Conn PJ (2008). „N4-Chloro-2-[(1,3-dioxo-1,3-dihydro-2H-isoindol-2-yl)methyl]phenyl2-hydroxybenzamide (CPPHA) acts through a novel site as a positive allosteric modulator of group 1 metabotropic glutamate receptors”. Mol. Pharmacol. 73 (3): 909—18. PMID18056795. doi:10.1124/mol.107.040097.
^Watkins JC, Jane DE. The glutamate story. British Journal of Pharmacology. 2006 Jan;147 Suppl 1:S100-8. . PMID16402093. doi:10.1038/sj.bjp.0706444.Недостаје или је празан параметар |title= (помоћ)
^Bespalov, AY; Dravolina, OA; Sukhanov, I.; et al. (2005). „Metabotropic glutamate receptor (mGluR5) antagonist MPEP attenuated cue- and schedule-induced reinstatement of nicotine self-administration behavior in rats”. Neuropharmacology. 49 Suppl 1: 167—78. PMID16023685. doi:10.1016/j.neuropharm.2005.06.007.
^Slassi A, Isaac M, Edwards L, Minidis A, Wensbo D, Mattsson J, Nilsson K, Raboisson P, McLeod D, Stormann TM, Hammerland LG, Johnson E (2005). „Recent advances in non-competitive mGlu5 receptor antagonists and their potential therapeutic applications”. Current Topics in Medicinal Chemistry. 5 (9): 897—911. PMID16178734.CS1 одржавање: Вишеструка имена: списак аутора (веза)
^Gasparini F, Bilbe G, Gomez-Mancilla B, Spooren W. mGluR5 antagonists: discovery, characterization and drug development. Current Opinion in Drug Discovery and Development. 11 (5): 655—65. септембар 2008. PMID18729017.Недостаје или је празан параметар |title= (помоћ)CS1 одржавање: Формат датума (веза)
^Hu Y, Dong L, Sun B, Guillon MA, Burbach LR, Nunn PA, Liu X, Vilenski O, Ford AP, Zhong Y, Rong W (јануар 2009). „The role of metabotropic glutamate receptor mGlu5 in control of micturition and bladder nociception”. Neuroscience Letters. 450 (1): 12—7. PMID19027050.CS1 одржавање: Вишеструка имена: списак аутора (веза)CS1 одржавање: Формат датума (веза)
^Jesse, C. R.; Wilhelm EA; Bortolatto, C. F.; Savegnago, L.; Nogueira, C. W. (јануар 2009). „Selective blockade of mGlu5 metabotropic glutamate receptors is hepatoprotective against fulminant hepatic failure induced by lipopolysaccharide and d-galactosamine in mice”. Journal of Applied Toxicology. PMID19153979.CS1 одржавање: Формат датума (веза)
^Simonyi, A.; Schachtman, T. R.; Christoffersen, G. R. (2005 Jul-Aug). „The role of metabotropic glutamate receptor 5 in learning and memory processes”. Drug News and Perspectives. 18 (6): 353—61. PMID16247513.Проверите вредност парамет(а)ра за датум: |date= (помоћ)
^Manahan-Vaughan D, Braunewell KH (новембар 2005). „The metabotropic glutamate receptor, mGluR5, is a key determinant of good and bad spatial learning performance and hippocampal synaptic plasticity”. Cerebral Cortex. 15 (11): 1703—13. PMID15703249.CS1 одржавање: Формат датума (веза)
^Palucha, A.; Pilc, A. (јул 2007). „Metabotropic glutamate receptor ligands as possible anxiolytic and antidepressant drugs”. Pharmacology and Therapeutics. 115 (1): 116—47. PMID17582504.CS1 одржавање: Формат датума (веза)
^Christoffersen GR, Simonyi A, Schachtman TR, Clausen B, Clement D, Bjerre VK, Mark LT, Reinholdt M, Schmith-Rasmussen K, Zink LV. mGlu5 antagonism impairs exploration and memory of spatial and non-spatial stimuli in rats. Behavioural Brain Research. 191 (2): 235—45. август 2008. PMID18471908.Недостаје или је празан параметар |title= (помоћ)CS1 одржавање: Формат датума (веза)
^Xu J, Zhu Y, Contractor A, Heinemann SF. mGluR5 has a critical role in inhibitory learning. Journal of Neuroscience. 29 (12): 3676—84. март 2009. PMID19321764.Недостаје или је празан параметар |title= (помоћ)CS1 одржавање: Формат датума (веза)
^Ayala JE, Chen Y, Banko JL, Sheffler DJ, Williams R, Telk AN, Watson NL, Xiang Z, Zhang Y, Jones PJ, Lindsley CW, Olive MF, Conn PJ. mGluR5 Positive Allosteric Modulators Facilitate both Hippocampal LTP and LTD and Enhance Spatial Learning. Neuropsychopharmacology. 2009 Mar 18. PMID19295507
^Liu, F.; Grauer, S.; Kelley, C.; et al. (2008). „ADX47273 [S-(4-fluoro-phenyl)3-[3-(4-fluoro-phenyl)-[1,2,4]-oxadiazol-5-yl]-piperidin-1-ylmethanone]: a novel metabotropic glutamate receptor 5-selective positive allosteric modulator with preclinical antipsychotic-like and procognitive activities”. J. Pharmacol. Exp. Ther. 327 (3): 827—39. PMID18753411. doi:10.1124/jpet.108.136580.
^Zhao, Z.; Wisnoski, DD; O'Brien, J. A.; et al. (2007). „Challenges in the development of mGluR5 positive allosteric modulators: the discovery of CPPHA”. Bioorg. Med. Chem. Lett. 17 (5): 1386—91. PMID17210250. doi:10.1016/j.bmcl.2006.11.081.
^O'Brien, J. A.; Lemaire, W.; Wittmann, M.; et al. (2004). „A novel selective allosteric modulator potentiates the activity of native metabotropic glutamate receptor subtype 5 in rat forebrain”. J. Pharmacol. Exp. Ther. 309 (2): 568—77. PMID14747613. doi:10.1124/jpet.103.061747.
^Chen, Y.; Nong, Y.; Goudet, C.; et al. (2007). „Interaction of novel positive allosteric modulators of metabotropic glutamate receptor 5 with the negative allosteric antagonist site is required for potentiation of receptor responses”. Mol. Pharmacol. 71 (5): 1389—98. PMID17303702. doi:10.1124/mol.106.032425.
^de Paulis T; Hemstapat, K.; Chen, Y.; et al. (2006). „Substituent effects of N-(1,3-diphenyl-1H-pyrazol-5-yl)benzamides on positive allosteric modulation of the metabotropic glutamate-5 receptor in rat cortical astrocytes”. J. Med. Chem. 49 (11): 3332—44. PMID16722652. doi:10.1021/jm051252j.
^Kinney, GG; O'Brien, J. A.; Lemaire, W.; et al. (2005). „A novel selective positive allosteric modulator of metabotropic glutamate receptor subtype 5 has in vivo activity and antipsychotic-like effects in rat behavioral models”. J. Pharmacol. Exp. Ther. 313 (1): 199—206. PMID15608073. doi:10.1124/jpet.104.079244.
^Silverman, J. L.; et al. (2012). „Negative Allosteric Modulation of the mGluR5 Receptor Reduces Repetitive Behaviors and Rescues Social Deficits in Mouse Models of Autism”. Science Translational Medicine. 4 (131): 131ra51. doi:10.1126/scitranslmed.3003501.
^Chiamulera C, Epping-Jordan MP, Zocchi A, Marcon C, Cottiny C, Tacconi S, Corsi M, Orzi F, Conquet F (2001). „Reinforcing and locomotor stimulant effects of cocaine are absent in mGluR5 null mutant mice”. Nat. Neurosci. 4 (9): 873—4. PMID11528416. doi:10.1038/nn0901-873.
^Fowler MA, Varnell AL, Cooper DC (2011). „mGluR5 knockout mice exhibit normal conditioned place-preference to cocaine”. Nature Precedings.
Literatura
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