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AMRA rece ptor receptor a amino 3 gidroksi 5 metil 4 izoksazolpropionovoyi kisloti AMPAR ionotropnij receptor glutamatu yakij peredaye zbudzhuyuchi signali v himichnih sinapsah nervovoyi sistemi AMRA receptori znajdeno praktichno v usih strukturah golovnogo mozku yih vvazhayut najbilsh rozpovsyudzhenim tipom receptoriv u nervovij sistemi Osnovnoyu funkciyeyu AMRA receptoru vvazhayut provedennya ta modulyaciyu signaliv zbudzhennya visokoyi rozdilnoyi zdatnosti u chasi 1 Svoyu nazvu receptor otrimav z oglyadu na zdatnist aktivuvatis pid chas zv yazuvannya z sintetichnim analogom glutamatu AMRA Risunok 1 Molekulyarna struktura AMRA receptora vbudovanogo v klitinnu membranu i zv yazuvannya z nim liganduRisunok 2 Trivimirna molekulyarna model AMRA receptora Zmist 1 Istoriya 2 Rozpovsyudzhennya 3 Struktura ta funkciyi subodinic 3 1 LBD 3 2 ATD 3 3 TMD 3 4 CTD 4 Transmembranni regulyatorni bilki 5 Farmakologiya 5 1 Agonisti 5 2 Konkurentni antagonisti 5 3 Nekonkurentni antagonisti 5 4 Bezkonkurentni antagonisti 5 5 Alosterichni modulyatori 6 Perebig aktivaciyi ta deaktivaciyi 7 Rol AMRA receptoriv u dovgotrivalij sinaptichnij potenciaciyi 7 1 Ionnij mehanizm 7 2 LTP ta ruh AMRA receptoriv do postsinaptichnogo ushilnennya 8 Rol AMRA receptoriv u dovgotrivalomu sinaptichnomu prignichenni 9 Dzherela 10 Oglyadova literaturaIstoriya RedaguvatiReceptor bulo vidkrito grupoyu Tage Honore z farmakologichnogo viddilennya Kopengagenskogo universitetu 2 Tetramernij AMRA receptor skladenij chotirma subodinicyami GluR2 stav pershim glutamatnim receptorom yakij otrimali u viglyadi kristaliv Rozpovsyudzhennya RedaguvatiAMRA receptori ye chislennim ta rozpovsyudzhenim tipom receptoriv u centralnij nervovij sistemi Veliku koncentraciyu subodinic GluR1 GluR2 ta GluR3 viyavleno v gipokampi zovnishnih sharah kori mozku bazalnih gangliyah nyuhovih chastkah migdalepodibnomu tili ta inshih zonah mozku Na vidminu vid nih subodinicya GluR4 v bagatoh dilyankah mozku nayavna v nevelikij kilkosti ale u mozochku talamusi ta spinnomu mozku yiyi koncentraciya velika 3 Na klitinnomu rivni metodom imunoprecipitaciyi bulo vstanovleno sho v piramidalnih klitinah gipokampu ekspresuyutsya AMRA receptori yaki skladayutsya z subodinici GluR2 u poyednanni z GluR1 abo GluR3 U deyakih nevelikih populyaciyah nejroniv zustrichayutsya gomomerni tobto taki sho skladayutsya lishe z odnogo tipu subodinic receptori GluR1 Taki receptori mayut ionoprovidni harakteristiki sho znachno vidriznyayutsya vid inshih AMRA receptoriv 4 Pid chas individualnogo rozvitku organizmu parametri ekspresiyi AMRA receptoriv zminyuyutsya Subodinicya GluR2 pochinaye viyavlyatis z 16 dobi embrionalnogo rozvitku mozku shura u toj chas yak inshi subodinici z yavlyayutsya znachno piznishe 3 Takozh vidnosna kilkist subodinici GluR2 mozhe zminyuvatis vnaslidok navedenoyi sinaptichnoyi plastichnosti mehanichnih ushkodzhen nervovoyi tkanini tosho Na subklitinnomu rivni AMRA receptori bulo viyavleno i na postsinaptichnij i na presinaptichnij membrani himichnogo sinapsu a takozh u menshij kilkosti na nesinaptichnih dilyankah klitinnoyi membrani nejrona prote 60 70 zagalnoyi kilkosti AMRA receptoriv u klitini postijno perebuvayut vseredini endoplazmatichnogo retikulumu 5 AMRA receptori takozh nayavni j u klitinah nejrogliyi de voni berut uchast u procesi apoptozu sprichinenogo glutamatnoyu toksichnistyu Aktivaciya AMRA receptoriv u glialnih klitinah prizvodit do vikidu cimi klitinami ATF ta monooksidu azotu 4 Geni sho koduyut sintez subodinic AMRA receptora u lyudini 6 Varianti nazvi subodinici Lokalizaciya genu v hromosomah Kilkist aminokislot u najdovshomu splajs variantiGluR1 GluRA GRIA1 GluA1 5 q31 1 906GluR2 GluRB GRIA2 GluA2 4 q32 q33 901GluR3 GluRC GRIA3 GluA3 X q25 q26 894GluR4 GluRD GRIA4 GluA4 11 q22 902Struktura ta funkciyi subodinic RedaguvatiSubodinici AMRA receptoriv ye modulnimi strukturami sho skladayutsya z chotiroh dilyanok yakim pritamannij visokij stupin avtonomnosti zovnishnoklitinnij amino terminalnij domen amino terminal domain ATD zovnishnoklitinnij domen sho zv yazuyetsya z ligandami ligand binding domain LBD transmembrannij domen transmembrane domain TMD ta vnutrishnoklitinnij karboksil terminalnij domen carboxyl terminal domain CTD div Risunok 1 Isnuyut chotiri tipi subodinic sho formuyut AMRA receptor GluR1 GluR2 GluR3 ta GluR4 pid chas utvorennya funkcionalnogo AMRA receptora voni kombinuyutsya po chotiri utvoryuyuchi tetramer Bilshist AMRA receptoriv ye geterotetramerami sho skladeni dimerom dimeriv odna subodinicya v kozhnomu z dvoh dimeriv zazvichaj GluR2 a insha GluR1 GluR3 abo GluR4 7 8 9 10 Tetramerizaciya subodinic vidbuvayetsya zavdyaki vzayemodiyi mizh LBD ta TMD vidpovidnih subodinic 11 Transkripciya RNK AMRA receptoriv regulyuyetsya bilkom CREB cAMP response element binding protein ta mitogen aktivovanimi proteyinkinazami Mitogen activated protein kinases MAPK 12 Formuvannya receptoriv vidbuvayetsya v shorstkomu endoplazmatichnomu retikulumi 13 de osoblivi mehanizmi kontrolyu zabezpechuyut nalezhne skladannya subodinic ta yih vzayemoroztashuvannya Bulo pokazano sho vzhe vseredini endoplazmatichnogo retikulumu vidbuvayutsya zmini konformaciyi receptoriv pov yazani z yihnoyu funkcionalnoyi aktivnistyu zv yazuvannyam ligandu glutamatu aktivaciyeyu desensitizaciyeyu tosho ci konformacijni zmini zdatni vplivati na proces transportuvannya receptoriv na zovnishnyu klitinnu membranu 14 13 Okrim togo znachnu rol v oligomerizaciyi receptoriv ta yihnomu transporti vidigrayut ATD yihnih subodinic 15 16 Pislya ostatochnogo formuvannya AMRA receptori vivilnyayutsya v citoplazmu LBD Redaguvati nbsp Risunok 3 Shema budovi subodinici AMRA receptora Ciframi 1 4 poznacheno transmembranni segmenti z vidpovidnim nomerom Glut misce zv yazuvannya glutamatu A misce zv yazuvannya AMRA Inshi poyasnennya div u teksti stattiLBD AMPA receptora formuye dva zovnishnoklitinnih segmenti sho istorichno nazivayutsya S1 ta S2 div Risunok 3 17 Ci dva segmenti formuyut kleshnepodibnu strukturu v yakij segment S1 sho roztashovanij na amino terminalnomu kinci membrannoyi petli M1 formuye odnu yiyi polovinu a segment S2 sho roztashovanij mizh petlyami M2 ta M3 formuye inshu div Risunok 3 Misce sajt zv yazuvannya agonista vmishuyetsya vseredini kleshni mizh dvoma segmentami Kontakti mizh poverhnyami segmentamiv S1 sho nalezhat do riznih subodinic dimeru stvoryuyut kilka dodatkovih sajtiv zv yazuvannya molekul alosterichnih modulyatoriv 18 Aktivaciya receptora pochinayetsya iz zv yazuvannya agonista z LBD Glutamat AMRA ta yih analogi mistyat kombinaciyi atomiv sho vidpovidayut a aminnij ta a karboksilnij grupam ci grupi zv yazuyutsya z vidpovidnimi dilyankami aminokislotnih zalishkiv na sajti zv yazuvannya receptora div Risunok 1 Dali v procesi aktivaciyi AMRA receptora zavdyaki zv yazuvannyu molekuli ligandu vidbuvayetsya zmina konformaciyi LBD Pislya zv yazuvannya z agonistom segmenti S1 ta S2 zmikayutsya nabagato tisnishe anizh koli receptor perebuvaye u vilnomu stani Segment S2 zsuvayetsya i sprichinyuye konformacijnu perebudovu korotkih lancyuzhkiv aminokislotnih zalishkiv sho poyednuyut LBD ta TMD segmenti M3 v TMD subodinic u svoyu chergu rozhodyatsya vidkrivayuchi ionnij kanal u klitinnij membrani div Risunok 3 19 Ruh segmentiv S1 ta S2 vidnosno odin odnogo prizvodit do nestabilnogo stanu LBD ta TMD Stabilnist makromolekuli mozhe buti vidnovlena u vipadku zvorotnogo vidkrittya kleshni v LBD sho vidbuvayetsya u razi zakrittya ionnogo kanalu i prizvodit do disociaciyi kompleksu ligand receptor Inshij shlyah vidnovlennya stabilnosti v makromolekuli polyagaye v perebudovi konformaciyi na kontaktnij poverhni mizh subodinicyami sho formuyut dimer todi stabilnist makromolekuli vidnovlyuyetsya ligand zalishayetsya zv yazanim z neyu ale ionnij kanal zakrivayetsya Takij stan receptora nazivayut desensitizovanim perebuvayuchi v nomu receptor neaktivnij tomu sho ionnij kanal zakrito ale ne mozhe buti aktivovanij pozayak sajt zv yazuvannya agonista vzhe zajnyato jogo molekuloyu 20 Alternativnij splajsing subodinic mozhe generuvati dvi izoformi AMRA receptora sho nazivayutsya flip ta flop formami Ci formi mayut riznu chutlivist do alosterichnih modulyatoriv a takozh u nih po riznomu vidbuvayutsya konformacijni zmini protyagom aktivaciyi deaktivaciyi ta desensitizaciyi receptora 21 22 ATD Redaguvati Pershi 400 450 aminokislotnih zalishkiv kozhnoyi subodinici AMRA receptora pochinayuchi z N kincya yak i v usih inshih ionotropnih glutamatnih receptorah formuyut ATD Aminokislotna poslidovnist ATD ionotropnih glutamatnih receptoriv maye visoku podibnist do LBD metabotropnih glutamatnih receptoriv ta deyakih bakterialnih periplazmatichnih bilkiv Z oglyadu na ce ATD vvazhayut dilyankoyu sho za poperednoyi evolyuciyi receptoriv bula pristosovana dlya zv yazuvannya endogennih ligandiv ale zgodom vtratila cyu funkciyu 23 24 25 26 27 Za dopomogoyu molekulyarno genetichnih metodiv bulo stvoreno veliku kilkist mutantnih subodinic AMRA receptora u kotrih ATD povnistyu vidsutnij Taki subodinici zdatni formuvati povnistyu funkcionalni receptori odnak yak bulo z yasovano zavdyaki cim mutaciyam ATD maye regulyatornu funkciyu jogo vidsutnist vplivaye na jmovirnist vidkrittya ionnogo kanalu receptora shvidkist deaktivaciyi desensitizaciyi tosho 16 28 29 30 15 31 32 Okrim togo na ATD bulo viyavleno sajti zv yazuvannya negativnih alosterichnih modulyatoriv takih yak feniletanolamin ifenprodil a takozh pentraksiniv 33 34 TMD Redaguvati TMD AMRA receptoriv skladayetsya z chotiroh transmembrannih tobto takih sho pronizuyut klitinnu membranu segmentiv M1 M2 M3 ta M4 Na pochatku doslidzhen receptora taka struktura TMD viklikala deyake neporozuminnya yaksho aminokislotnij lancyug bilkovoyi makromolekuli prohodit kriz klitinnu membranu parne chislo raz to jogo C kinec ta N kinec mayut buti roztashovani z odnogo boku membrani ale vodnochas molekulyarno biologichnimi metodami bulo vstanovleno sho C kinec makromolekuli receptornoyi subodinici roztashovanij vseredini klitini a N kinec zzovni Cyu superechnist bulo rozv yazano koli z yasuvalosya sho segment M2 ne prohodit membranu naskriz a zginayetsya ta vihodit znovu na tomu zh vnutrishnoklitinnomu yiyi boci div Risunok 3 35 Ionopronikni vlastivosti AMRA receptoriv sho mistyat GluR2 subodinicyu mozhut buti modifikovani posttranskripcijno kodon aminokisloti glutaminu Q sho roztashovana na vershini pereginu segmentu M2 Q R sajt mozhe buti zaminenij na kodon argininu R 36 Cya modifikaciya istotno vplivaye na ionnij transport kriz kanal receptora Q forma AMRA receptoriv propuskaye ioni Sa2 i ye majzhe nechutlivoyu do vnutrishnoklitinnih poliaminnih blokatoriv ionnogo kanalu u svoyu chergu R forma ye praktichno neproniknoyu dlya ioniv kalciyu i mozhe buti zablokovana poliaminnimi blokatorami 37 Perevazhna bilshist AMRA receptoriv u nervovij sistemi nalezhit do R formi Pid chas formuvannya receptornogo tetramera segmenti M2 ta M3 sho nalezhat do TMD formuyut vlasne transmembrannij ionnij kanal shirinoyu 0 7 0 8 nanometriv M2 formuye jogo chastinu sho vihodit vseredinu klitini M3 chastinu sho vihodit nazovni segment M1 u receptori sho diye roztashovanij nazovni vid M2 ta M3 a segment M4 utvoyuye poverhnyu dotichnu do segmentiv M2 ta M3 subodinici partnera po dimeru 18 CTD Redaguvati CTD AMRA receptora ye najbilsh nestabilnim domenom z poglyadu poslidovnosti aminokislotnih zalishkiv jogo pervinna struktura ye riznoyu dlya vsih chotiroh pidtipiv subodinic Cej domen mistit sajti zvʼyazuvannya znachnoyi kilkosti vnutrishnoklitinnih bilkiv kotri regulyuyut ruh receptoriv u klitinnij membrani yih ionoprovidnist tosho 38 Okrim togo CTD riznih tipiv subodinic mozhe vzayemodiyati z riznimi klitinnimi signalnimi bilkami napriklad CTD subodinici GluR1 z guanozin monofosfat zalezhnoyu proteyinkinazoyu 39 CTD GluR4 z proteyinkinazoyu S 40 Taka vzayemodiya zabezpechuye regulyaciyu funkcionuvannya receptoriv aktivaciyu deaktivaciyu membrannij transport tosho yak vidpovid na perebig vnutrishnoklitinih procesiv Harakteristiki odinochnogo kanalu AMRA receptora Subodinici sho skladayut receptor Imovirnist vidkrittya pri aktivaciyi glutamatom Serednij chas perebuvannya u vidkritomu stani ms Elektroprovidnist pS GluR1 flip 0 4 1 0 41 42 0 2 0 9 41 8 15 23 31 41 43 44 GluR2 flipQ 0 61 45 0 32 1 47 46 7 15 24 36 46 47 GluR3 flip 0 82 48 GluR4 flip 0 77 42 0 14 3 3 49 9 20 31 45 49 50 Transmembranni regulyatorni bilki RedaguvatiPid chas doslidzhennya vlastivostej AMRA receptoriv ekspresovanih u shtuchnih geterogennih sistemah oociti zhabi ne nejronni klitinni kulturi yih harakteristiki viyavilis vidminnimi vid takih u receptoriv sho yih vivchali v zhivij nervovij tkanini Cya nevidpovidnist svidchit pro isnuvannya deyakogo modulyuyuchogo komponentu pritamannogo same nervovij tkanini Velika kilkist rozbizhnostej u harakteristikah stala zrozumiloyu pislya vidkrittya transmembrannih AMRA receptor regulyuyuchih bilkiv transmembrane AMPA receptor regulatory Proteins TARPs TARP ce integrovani bilki klitinnoyi membrani z chotirma transmembrannimi domenami sho selektivno vzayemodiyut z AMRA receptorami pochinayuchi z rannih stadij yih sintezu pid chas transportuvannya vbudovuvannya v membranu ta peredachi nervovih signaliv 51 50 52 Iz kozhnim AMRA receptornim tetramerom asocijovano dva abo chotiri TARP voni vzayemodiyut iz receptorom na rivni vnutrishnoklitinnih transmembrannih ta zovnishnih domeniv 53 54 Najbilsh rozpovsyudzheni tipi TARP a same g 2 g 3 g 4 ta g 8 vzayemodiyut z usima chotirma pidtipami subodinic TARP g 2 stargazin bulo vpershe identifikovano v mozochku yak proteyin neobhidnij dlya transportu AMRA receptora z endoplazmatichnogo retikulumu do klitinnoyi membrani 55 Na dodatok do transportnoyi funkciyi TARP zvʼyazuyuchis z AMRA receptorom zbilshuye providnist ionnogo kanalu ta jmovirnist jogo vidkrittya upovilnyuye deaktivaciyu ta desensitizaciyu 56 57 50 Farmakologiya RedaguvatiOsnovnim endogennim ligandom AMRA receptoriv ye glutamat yakij zv yazuyetsya z kleshnepodibnoyu strukturoyu na LBD kozhnoyi z subodinic div vishe Takim chinom AMRA receptor maye chotiri miscya sajti zv yazuvannya glutamatu Vidkrittya ionnogo kanalu vidbuvayetsya vzhe pislya zv yazuvannya agonista z dvoma sajtami ale zv yazuvannya z bilshoyu kilkistyu sajtiv zbilshuye providnist kanalu ta serednij chas jogo perebuvannya u vidkritomu stani Pid chas zv yazuvannya z LBD molekula glutamatu zavdyaki nayavnosti dvoh karboksilnih ta aminnoyi grupi utvoryuye dev yat vodnevih zv yazkiv z kilkoma riznimi aminokislotnimi zalishkami 58 Agonisti Redaguvati Okrim glutamatu AMRA receptor mozhe buti aktivovanij velikoyu kilkistyu prirodnih ta shtuchnih ligandiv ibotenovoyu kislotoyu vilardiyinom a takozh yih chislennimi pohidnimi ta pohidnimi AMRA gidroksinorketaminom 59 div tablicyu Deyaki z cih agonistiv viyavlyayut dostatnyu selektivnist dlya rozriznennya efektiv subodinic GluR1 GluR2 ta GluR3 GluR4 napriklad Cl NIVO pohidna ibotenovoyi kisloti aktivuye GluR1 ta GluR2 u 275 ta u 1600 raziv menshih koncentraciyah nizh GluR3 ta GluR4 vidpovidno Prote nezvazhayuchi na mozhlivist farmakologichnogo rozriznennya efektiv GluR1 GluR2 ta GluR3 GluR4 na potochnij moment 2011 rik she ne vidkrito ligandi yaki dozvolyayut rozriznyati efekti kozhnogo individualnogo tipu subodinic Znachennya ES50 agonistiv AMRA receptora mM Agonist GluR1 GluR2 GluR3 GluR4L Glutamat 3 4 22 60 61 62 63 6 2 296 60 64 65 1 3 35 60 61 62 560 66 AMRA 1 3 8 7 62 67 68 66 65 1 4 130 62 67 68 1 3 68 Kayinat 32 34 63 67 130 170 69 31 36 62 67 Vilardiyin 11 5 70 6 3 46 F Vilardiyin 0 47 70 0 2 0 5 46 71 20 9 71 11 9 71 Br Vilardiyin 2 8 70 0 84 46 I Vilardiyin 33 6 70 1 5 46 Br NIVO 14 60 5 4 60 202 60 39 60 Cl NIVO 4 7 72 1 7 72 2700 72 1300 72 S CPW399 24 9 73 13 9 73 224 73 34 3 73 S ATPA 22 74 7 9 74 7 6 74 ACPA 1 1 11 62 75 15 75 0 1 5 62 75 1 1 75 S 4 AHCP 4 5 76 7 2 76 15 76 S Thio ATPA 5 2 77 13 40 77 32 77 20 77 2 Et Tet AMPA 42 78 52 78 18 78 4 78 S 2 Me Tet AMPA 0 16 68 3 4 65 0 014 68 0 009 68 SYM2081 132 61 453 61 Domoyeva kislota 1 3 63 0 97 61 21 61 Konkurentni antagonisti Redaguvati Konkurentni antagonisti AMRA receptora zazvichaj harakterizuyutsya navnistyu a aminogrupi poyednanoyi z geterociklichnoyu kilcevoyu dilyankoyu 79 Pershimi shirokovzhivanimi antagonistami receptora buli kvinoksalindioni CNQX DNQX NBQX Cikavo sho za nayavnosti TARP asocijovanih z AMRA receptorom CNQX ta DNQX ale ne NBQX peretvoryuyutsya na slabki chastkovi agonisti CNQX ta DNQX viklikayut chastkove zakrittya kleshni LBD sho vidpovidaye koncepciyi diyi chastkovogo agonista 58 za isnuyuchoyu gipotezoyu TARP regulyuye stupin vidkrittya kleshni i robit yiyi dostatnoyu dlya indukciyi vidkrittya ionnogo kanalu 80 Na vidminu vid kvinoksalindioniv spoluki NS1209 ta UBP282 stabilizuyut kompleks S1 S2 u bilsh vidkritomu stani anizh harakterno dlya nezvʼyazanogo z ligandami receptora Znachennya IC50 konkurentnih antagonistiv AMRA receptora mM Antagonist GluR1 GluR2 GluR3 GluR4CNQX 0 6 63 0 18 81 2 11 82 DNQX 0 25 83 0 45 81 1 66 82 0 19 0 49 83 NBQX 0 4 84 0 59 75 0 31 0 63 75 82 0 1 84 ATPO 38 75 65 75 110 75 150 75 YM90K 1 96 82 NS1209 0 12 85 0 13 85 0 11 85 0 06 85 Kinurenova kislota 1900 86 LY293558 9 2 87 0 4 3 2 87 88 32 89 51 87 UBP310 gt 100 90 ACET gt 100 90 Nekonkurentni antagonisti Redaguvati Osnovnimi klasami nekonkurentnih antagonistiv AMRA receptoru ye 2 3 benzodiazepini napriklad GYKI 53655 gidroftalazini ta tetragidroizokinalini 91 Na vidminu vid CNQX ta DNQX GYKI 53655 zalishayetsya efektivnim antagonistom AMRA receptora takozh i za prisutnosti TARP do togo zh jogo aktivnist yak antagonista navit pidvishuyetsya 92 Zavdyaki molekulyarno genetichnim doslidzhennyam bulo dovedeno sho GYKI 53655 zv yazuyetsya odnochasno z dilyankami sho poyednuyut segmenti S2 z M4 ta S1 z M1 93 ostannya dilyanka ye kritichnoyu lankoyu v procesi vidkrittya ionnogo kanalu 18 Znachennya IC50 nekonkurentnih antagonistiv AMRA receptora mM Antagonist GluR1 GluR2 GluR3 GluR4GYKI 52466 18 117 94 95 34 82 22 66 94 95 GYKI 53405 24 94 28 94 GYKI 53655 6 94 5 94 LY 300164 21 96 18 96 19 96 18 96 CP 465 022 0 5 93 0 5 93 0 3 93 Bezkonkurentni antagonisti Redaguvati Bezkonkurentni antagonisti AMRA receptora taki yak filantotoksini 97 abo kanalni blokatori dlya svoyeyi diyi potrebuyut poperednogo perehodu ionnogo kanalu receptora do vidkritogo stanu pislya zv yazuvannya zi specifichnim sajtom vseredini kanalu ci rechovini mehanichno blokuyut prohodzhennya ioniv kriz nogo 98 Takim chinom rozvitok efektu cih antagonistiv kriva doza efekt zalezhit vid stupenyu poperednoyi aktivaciyi receptoriv u doslidzhuvanij tkanini U svoyu chergu reaktivaciya receptora pislya yih zv yazuvannya vidbuvayetsya tilki pid diyeyu agonista sho zdaten viklikati vidkrittya ionnogo kanalu tomu vidnovlennya diyalnosti receptoriv pislya diyi takih antagonistiv vidbuvayetsya zazvichaj povilnishe nizh dlya antagonistiv poperednih klasiv Znachennya IS50 bezkonkurentnih antagonistiv AMRA receptora mM Dani dlya subodinici GluR2 navedeni dlya yiyi Q formi N D rechovina ne diye Antagonist GluR1 GluR2 GluR3 GluR4Argiotoksin 636 0 35 3 4 99 100 N D 99 0 23 99 0 43 99 Toksin dzhoro 0 04 101 N D 101 0 03 101 Filantotoksin 433 0 8 102 Filantotoksin 343 2 8 100 Filantotoksin 56 3 3pM 103 Filantotoksin 74 2 8 103 IEM 1460 1 6 104 N D 105 1 6 104 IEM 1754 6 0 104 6 0 104 Alosterichni modulyatori Redaguvati Alosterichnimi modulyatorami ye rechovini sho zminyuyut aktivnist AMRA receptora shlyahom zmini perebigu procesiv deaktivaciyi ta desensitizaciyi 106 Zv yazuvannya agonista z LBD sprichinyaye viniknennya napruzhen u receptornij molekuli kotri mozhe buti znyato dvoma shlyahami vidkrittyam ionnogo kanalu aktivaciya receptora abo zminoyu konformaciyi molekuli na taku de kanal zakritij ale napruzhennya vidsutni desensitizaciya receptoru U pershomu vipadku pislya disociaciyi ligand receptornogo kompleksu ionnij kanal zakrivayetsya a receptor perehodit do nenapruzhenoyi konformaciyi deaktivaciya div Risunok 5 Pozitivni modulyatori AMRA receptoru napriklad piracetam 107 zv yazuyutsya z LBD perevodyachi jogo v konformaciyu tranzit yakoyi do nenapruzhenogo stanu pislya zv yazuvannya z agonistom potrebuye bilshoyi energiyi nizh u nezv yazanomu z modulyatorom stani takim chinom modulyatori zapobigayut desensitizaciyi receptora Deyaki z modulyatoriv takozh zdatni upovilnyuvati abo priskoryuvati disociaciyu kompleksu agonist receptor takim chinom vidbuvayetsya modulyaciya procesu deaktivaciyi Najvazhlivishim parametrom sho viznachaye riznicyu mizh alosterichnimi modulyatorami ye same mehanizm yihnoyi diyi Zokrema aniracetam upovilnyuye proces deaktivaciyi ne vplivayuchi na silu diyi agonistiv RERA pidsilyuye efekt AMRA receptoriv zmenshuyuchi stupin ta upovilnyuyuchi proces yihnoyi desensitizaciyi ale ne vplivaye na deaktivaciyu ciklotiazid pidsilyuye afinnist agonistiv 108 Natomist LY404187 stabilizuye AMRA receptor u vidkritomu stani pislya zvʼyazuvannya jogo z agonistom bez vplivu na shvidkist desensitizaciyi i takim chinom dozvolyaye receptoram perehoditi do vidkritogo stanu abo bezposeredno abo cherez promizhnu desensitizovanu konformaciyu 109 Deyaki spoluki SH614 odnochasno ingibuyut i proces desensitizaciyi i proces deaktivaciyi zavdyaki dosi nevidomomu mehanizmu 110 Sila efektu alosterichnih modulyatoriv mozhe zalezhati vid splajs variantiv receptora z yakimi voni vzayemodiyut Napriklad ciklotiazid praktichno povnistyu zapobigaye desensitizaciyi flip variantu receptora ale ye lishe pomirno aktivnim u vipadku zv yazuvannya z flop variantom 48 Perebig aktivaciyi ta deaktivaciyi RedaguvatiShvidkist perebigu procesiv aktivaciyi ta deaktivaciyi gejting ye odniyeyu z klyuchovih harakteristik sho viznachayut rol receptora u fiziologiyi sinapsiv sinaptichnij plastichnosti ta u formuvanni nejronnih signaliv Harakteristiki gejtingu mozhut duzhe vidriznyatisya zalezhno vid tipu subodinic sho skladayut receptor alternativnogo splajsingu nayavnosti regulyuyuchih bilkiv ta in Porivnyano z inshimi tipami ionotropnih glutamatnih receptoriv NMDA kayinatni AMRA receptori harakterizuyutsya najshvidshim gejtingom ta desensitizaciyeyu tobto maye najmenshi znachennya chasovoyi staloyi procesu Ce dozvolyaye yim modulyuvati membranni strumi z velikoyu chasovoyu rozdilnistyu zminyuyuchi takim chinom parametri ta harakteristiki nervovogo signalu protyagom chasovih promizhkiv v odinici milisekund 1 Kinetichni pokazniki u milisekundah efektu AMRA receptora pid chas jogo aktivaciyi glutamatom Subodinici sho skladayut receptor t displaystyle tau nbsp Deaktivaciyi t displaystyle tau nbsp Desensitizaciyi t displaystyle tau nbsp VidnovlennyaGluR1 flip 0 7 1 2 111 22 21 112 2 5 4 1 111 22 21 112 113 111 147 114 111 22 GluR1 flop 0 86 1 3 111 22 21 112 115 3 2 4 2 111 22 21 112 113 115 147 155 111 22 115 GluR2 flipQ 0 62 1 1 112 45 5 9 9 9 112 113 45 11 7 45 GluR2 flopQ 0 54 0 9 112 45 1 2 1 9 112 113 45 31 3 45 GluR3 flip 0 56 48 3 0 5 1 21 113 48 116 15 70 48 117 GluR3 flop 0 63 1 05 115 48 1 1 2 8 21 112 113 115 48 116 55 142 48 116 105 GluR4 flip 0 6 21 3 6 5 1 21 113 6 21 114 117 GluR4 flop 0 6 21 0 9 21 113 31 43 117 GluR1 flip GluR2 flip 5 1 21 28 67 21 GluR3 flip GluR2 flip 4 9 21 15 26 21 Rol AMRA receptoriv u dovgotrivalij sinaptichnij potenciaciyi Redaguvati nbsp Risunok 6 Regulyaciya transportu AMRA receptoriv do postsinaptichnogo ushilnennya pri nadhodzhenni stimulu sho indukuye LTP NSF N ethylmaleimide sensitive fusion proteinYavishe dovgotrivaloyi sinaptichnoyi potenciaciyi Long Term Potentiation LTP u glutamatnih sinapsah zalezhit vid dvoh osnovnih komponentiv presinaptichnogo vivilnennya glutamatu ta postsinaptichnoyi depolyarizaciyi Narazi LTP vvazhayut odnim z vazhlivih klitinnih mehanizmiv sho formuye ta kontrolyuye pam yat Vihodyachi z cogo u nejrofiziologiyi nejrohimiyi ta nejrofarmakologiyi velika uvaga pridilyayetsya vivchennyu molekulyarnih mehanizmiv LTP Pid chas doslidzhen bulo dovedeno sho AMRA receptori vidigrayut znachnu rol u formuvannya efektu LTP Ionnij mehanizm Redaguvati Uzagalnyuyuchi rol AMRA receptoriv u formuvanni shvidkogo komponentu LTP polyagaye v nastupnomu Glutamat sho vivilnyayetsya z presinaptichnogo nejrona zv yazuyetsya z kilkoma vidami ionno kanalnih receptoriv zokrema z AMRA receptorami ta NMDA receptorami NMDAR Zv yazuvannya z ligandom prizvodit do vidkrittya AMRA receptoriv yaki propuskayut ioni natriyu vseredinu klitini sho prizvodit do depolyarizaciyi klitinnoyi membrani NMDAR na pochatku procesu ne vidkrivayutsya tomu sho yih ionnij kanal za normalnogo membrannogo potencialu blokuyetsya ionami magniyu Ale zavdyaki nadhodzhennyu ioniv natriyu kriz AMRA receptori membrannij potencial znizhuyetsya nastilki sho cogo dosit dlya vivilnennya magniyu z NMDAR ta vidkrittya yih ionnih kanaliv Na vidminu vid AMRA receptoriv NMDAR propuskaye ne lishe natrij ale j ioni kalciyu Kalcij sho nadhodit do klitini rozpochinaye potenciaciyu efektiv AMRA receptoriv zokrema vin prizvodit do fosforilyuvannya fermentu kalmodulin zalezhnoyi proteyinkinazi II SaMKII yakij u svoyu chergu viklikaye fosforilyuvannya subodinic AMRA receptora pidvishuyuchi providnist ionnih kanaliv a pidvishennya ionnoyi providnosti kanaliv AMRA receptoriv prizvodit do aktivnishogo nadhodzhennya natriyu do klitini sho nadaye procesu pozitivnij zvorotnij zv yazok Risunok 6 SaMKII zdatna iniciyuvati kilka riznih shlyahiv transportuvannya AMRA receptoriv na zovnishnyu perisinaptichnu membranu Pryame fosforilyuvannya sinaps asocijovanogo proteyinu 97 synaptic associated protein 97 SAP97 118 SAP97 ta miozin VI rushijnij bilok zv yazuyutsya z C kincem AMRA receptora Pislya fosforilyaciyi SaMKII ves cej kompleks transportuyetsya do perisinaptichnoyi membrani 119 Mozhliva aktivaciya transportu cherez MARK kontrolovanu sistemu U comu vipadku SaMKII aktivuye bilki Ras yaki u svoyu chergu aktivuyut MARK kotra vzhe transportuye i vbudovuye AMRA receptori v sinaptichnu membranu 120 LTP ta ruh AMRA receptoriv do postsinaptichnogo ushilnennya Redaguvati Pislya potraplyannya AMRA receptoru do perisinaptichnoyi dilyanki klitinnoyi membrani cherez SaMKII abo MARK kontrolovanu sistemu receptori ruhayutsya do postsinaptichnogo ushilnennya PSU dani shodo mehanizmiv cogo procesu dosi ye superechlivimi Odnim z mozhlivih mehanizmiv ye pryamij ruh AMRA receptoriv z perisinaptichnoyi membrani do PSU pid chas LTP 121 Inshij mozhlivij mehanizm ce poglinannya receptoriv na perisinaptichnih dilyankah ta yih peresuvannya do PSU u membrannih vezikulah zseredini klitini 122 Vidpovidno do eksperimentalnih danih protyagom LTP vidbuvayutsya obidva opisani procesi ale lishe pryamij ruh receptoriv u klitinnij membrani zbilshuye yih kilkist u PSU 123 Mehanizm sho zabezpechuye ruh receptoriv membranoyu do PSU pid chas LTP takozh ostatochno ne z yasovano Odnak bulo viyavleno kilka vidiv klitinnih 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