GABAB receptor
| Receptor gama aminobuterne kiseline (GABA) B, 1 | |
|---|---|
| Identifikatori | |
| Simbol | GABBR1 |
| Entrez | 2550 |
| HUGO | 4070 |
| OMIM | 603540 |
| RefSeq | NM_021905 |
| UniProt | Q9UBS5 |
| Drugi podaci | |
| Lokus | Hromozom 6 p21.3 |
| Receptor gama aminobuterne kiseline (GABA) B, 2 | |
|---|---|
| Identifikatori | |
| Simbol | GABBR2 |
| Alt. simboli | GPR51 |
| Entrez | 9568 |
| HUGO | 4507 |
| OMIM | 607340 |
| RefSeq | NM_005458 |
| UniProt | O75899 |
| Drugi podaci | |
| Lokus | Hromozom 9 q22.1-22.3 |
GABAB receptori (GABABR) su metabotropni transmembranski receptori za gama-aminobuternu kiselinu (GABA) koji su vezani putem G proteina za kalijumske kanale.[1] Promena koncentracije kalijuma hiperpolarizuje ćeliju na kraju akcionog potencijala. GABAB posredovana promena potencijala je -100 mV, to je znatno više od promene potencijala koju proizvodi GABAA. GABAB receptori su prisutni u centralnom i perifernom autonomnom nervnom sistemu.
Funkcije[uredi | uredi kod]
Oni mogu da stimulišu otvaranje K+ kanala ćime se neuron približava ravnotežnom potencijalu K+ jona, te dolazi do popularizaciju neurona. Time se sprečava otvaranje natrijumovog kanala, dejstvo akcionog potencijala, i otvaranje VDCC kanala, te se zaustavlja otpuštanje neurotransmitera. GABAB receptori se smatraju inhibitornim receptorima.
GABAB receptori takođe mogu da umanje aktivnost adenilil ciklaze i da redukuju ćelijsku provodnost za Ca2+.
GABAB receptori posreduju dejstvo etanola,[2] i gama-hidroksibuterne kiseline (GHB).[3][4] Nedavna istraživanja sugeriraju da ovi receptori imaju važnu ulogu u razvoju organizma.[5]
Struktura[uredi | uredi kod]
GABAB receptori imaju sličnu strukturu sa metabotropnim glutamatnim receptorima.[6] Poznata su dva podtipa receptora, GABAB1 i GABAB2,[7]. Oni se javljaju kao heterodimeri u neuronskim membranama. Do dimerizacije dolazi putem formiranja nevezujućih interakcija njihovih intracelularnih C terminusa.[6]
Smatra se da vezivanje liganda uzrokuje znatnu konformacionu promenu aktivnog mesta.
Selektivni ligandi[uredi | uredi kod]
Reference[uredi | uredi kod]
- ↑ Chen K, Li H, Ye N, Zhang J, Wang J (2005). „Role of GABAB receptors in GABA and baclofen-induced inhibition of adult rat cerebellar interpositus nucleus neurons in vitro”. Brain Res Bull 67 (4): 310–8. DOI:10.1016/j.brainresbull.2005.07.004. PMID 16182939.
- ↑ Dzitoyeva S, Dimitrijevic N, Manev H (2003). „Gamma-aminobutyric acid B receptor 1 mediates behavior-impairing actions of alcohol in Drosophila: adult RNA interference and pharmacological evidence”. Proc Natl Acad Sci USA 100 (9): 5485–90. Bibcode 2003PNAS..100.5485D. DOI:10.1073/pnas.0830111100. PMC 154371. PMID 12692303.
- ↑ Dimitrijevic N, Dzitoyeva S, Satta R, Imbesi M, Yildiz S, Manev H (2005). „Drosophila GABA(B) receptors are involved in behavioral effects of gamma-hydroxybutyric acid (GHB)”. Eur J Pharmacol 519 (3): 246–52. DOI:10.1016/j.ejphar.2005.07.016. PMID 16129424.
- ↑ Manev H, Dimitrijevic N (2004). „Drosophila model for in vivo pharmacological analgesia research”. Eur J Pharmacol 491 (2-3): 207–8. DOI:10.1016/j.ejphar.2004.03.030. PMID 15140638.
- ↑ Dzitoyeva S, Gutnov A, Imbesi M, Dimitrijevic N, Manev H (2005). „Developmental role of GABAB(1) receptors in Drosophila”. Brain Res Dev Brain Res 158 (1-2): 111–4. DOI:10.1016/j.devbrainres.2005.06.005. PMID 16054235.
- ↑ 6,0 6,1 MRC (Medical Research Council). 2003. Glutamate receptors: Structures and functions. Arhivirano 2007-09-15 na Wayback Machine-u University of Brisotol Centre for Synaptic Plasticity.
- ↑ Purves D., Augustine G.J., Fitzpatrick D., Katz L.C., LaMantia A.S., McNamara J.O., and Williams S.M. 2001. Neuroscience, Second Edition. Sinauer Associates, Inc.
- ↑ Urwyler S, Mosbacher J, Lingenhoehl K, Heid J, Hofstetter K, Froestl W, Bettler B, Kaupmann K (November 2001). „Positive allosteric modulation of native and recombinant gamma-aminobutyric acid(B) receptors by 2,6-Di-tert-butyl-4-(3-hydroxy-2,2-dimethyl-propyl)-phenol (CGP7930) and its aldehyde analog CGP13501”. Mol. Pharmacol. 60 (5): 963–71. PMID 11641424. Arhivirano iz originala na datum 2008-10-11. Pristupljeno 2014-04-26.
- ↑ Adams CL, Lawrence AJ (2007). „CGP7930: a positive allosteric modulator of the GABAB receptor”. CNS Drug Rev 13 (3): 308–16. DOI:10.1111/j.1527-3458.2007.00021.x. PMID 17894647.
- ↑ Paterson NE, Vlachou S, Guery S, Kaupmann K, Froestl W, Markou A (July 2008). „Positive modulation of GABA(B) receptors decreased nicotine self-administration and counteracted nicotine-induced enhancement of brain reward function in rats”. J. Pharmacol. Exp. Ther. 326 (1): 306–14. DOI:10.1124/jpet.108.139204. PMC 2574924. PMID 18445779.
- ↑ Urwyler S, Pozza MF, Lingenhoehl K, Mosbacher J, Lampert C, Froestl W, Koller M, Kaupmann K (October 2003). „N,N'-Dicyclopentyl-2-methylsulfanyl-5-nitro-pyrimidine-4,6-diamine (GS39783) and structurally related compounds: novel allosteric enhancers of gamma-aminobutyric acidB receptor function”. J. Pharmacol. Exp. Ther. 307 (1): 322–30. DOI:10.1124/jpet.103.053074. PMID 12954816.
- ↑ Froestl W, Gallagher M, Jenkins H, Madrid A, Melcher T, Teichman S, Mondadori CG, Pearlman R (October 2004). „SGS742: the first GABA(B) receptor antagonist in clinical trials”. Biochemical Pharmacology 68 (8): 1479–87. DOI:10.1016/j.bcp.2004.07.030. PMID 15451390.
- ↑ Bullock R (January 2005). „SGS-742 Novartis”. Current Opinion in Investigational Drugs (London, England : 2000) 6 (1): 108–13. PMID 15675610.