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Koreceptor ce receptor klitinnoyi poverhni yakij zv yazuye signalnu molekulu na dodatok do pervinnogo receptora shob polegshiti rozpiznavannya ligandu ta iniciyuvati biologichni procesi taki yak proniknennya patogena v klitinu hazyayina Zmist 1 Vlastivosti 2 Lokalizaciya ta funkciya 3 Deyaki klasichni prikladi 3 1 Simejstvo CD 3 2 Simejstvo receptoriv CCR 4 Klinichne znachennya 4 1 Spadkovi koreceptorni autosomni zahvoryuvannya 4 2 Rak 4 3 VIL 4 4 Gepatit S 4 5 Blokada koreceptoriv yak likuvannya autoimunitetu 5 Suchasni napryamki doslidzhen 5 1 VIL 5 2 Rak 6 Divis takozh 7 PrimitkiVlastivosti RedaguvatiTermin koreceptor ye vidomim u literaturi shodo signalnoyi transdukciyi procesu za dopomogoyu yakogo zovnishni podrazniki regulyuyut vnutrishnye funkcionuvannya klitini 1 Optimalne funkcionuvannya klitini zabepechuyetsya zavdyaki nayavnosti specialnogo mozhe diyevogo ta efektivnogo mehanizmu Zokrema proces za dopomogoyu yakogo mizhmolekulyarni reakciyi spryamovuyut i posilyuyut pozaklitinni signali po vsij poverhni klitini vidbuvayutsya za dvoma mehanizmami Po pershe receptori klitinnoyi poverhni mozhut bezposeredno peredavati signali mayuchi serin i treonin abo prosto serin v citoplazmatichnomu domeni dilyanci bilkovoyi molekuli Receptori takozh mozhut peredavati signali cherez molekuli adapteri svogo citoplazmatichnogo domenu yaki zv yazuyutsya z signalnimi povtoryuvalnimi molekulyarnimi poslidovnostyami motivami Po druge pevni poverhnevi receptori bez citoplazmatichnogo domenu mozhut peredavati signali cherez zv yazuvannya ligandu Pri comu utvoryuyetsya kompleks z vidpovidnim poverhnevim receptorom dlya regulyuvannya peredachi signaliv 2 Ci kategoriyi receptoriv klitinnoyi poverhni chasto nazivayut koreceptorami Koreceptori takozh nazivayut dopomizhnimi receptorami osoblivo v galuzi biomedichnih doslidzhen ta imunologiyi 1 Koreceptori ce bilki yaki mayut trivimirnu strukturu Veliki pozaklitinni domeni stanovlyat priblizno 76 100 receptora 2 Motivi sho utvoryuyut veliki pozaklitinni domeni berut uchast u zv yazuvanni ligandu ta utvorenni kompleksu 3 Motivi mozhut vklyuchati glikozaminoglikani povtori EGF zalishki cisteyinu abo domeni ZP 1 2 Riznomanitnist motiviv prizvodit do togo sho koreceptori mozhut vzayemodiyati z dvoma dev yatma riznimi ligandami yaki sami takozh mozhut vzayemodiyati z nizkoyu riznih koreceptoriv 2 Bilshist koreceptoriv ne maye citoplazmatichnogo domenu i mayut tendenciyu buti glikozilfosfatidilinozitol GPI pov yazanimi hocha bulo identifikovano kilka receptoriv yaki mistyat korotki citoplazmatichni domeni yaki ne mayut vnutrishnoyi kinaznoyi aktivnosti 2 Lokalizaciya ta funkciya RedaguvatiZalezhno vid tipu ligandu z yakim zv yazuyetsya koreceptor jogo roztashuvannya ta funkciya mozhut zminyuvatisya Rizni ligandi vklyuchayut interlejkini nejrotrofichni faktori faktori rostu fibroblastiv transformuyuchi faktori rostu faktori rostu endoteliyu sudin ta epidermalni faktori rostu 3 Koreceptori osoblivo v embrionalnij tkanini vidigrayut istotnu rol u formuvanni gradiyenta morfogenu abo diferenciaciyi tkanin 2 Koreceptori lokalizovani v endotelialnih klitinah funkcionuyut dlya posilennya proliferaciyi ta migraciyi klitin 3 Zavdyaki takij riznomanitnosti shodo roztashuvannya koreceptori mozhut brati uchast u bagatoh riznih klitinnih aktivnostyah Koreceptori buli identifikovani yak uchasniki klitinnih signalnih kaskadiv embrionalnogo rozvitku regulyaciyi adgeziyi klitin formuvannya gradiyenta proliferaciyi ta migraciyi tkanin 2 Deyaki klasichni prikladi RedaguvatiSimejstvo CD Redaguvati Simejstvo koreceptoriv CD ce dobre vivchena grupa pozaklitinnih receptoriv sho znahodyatsya v imunologichnih klitinah 4 Simejstvo receptoriv CD zazvichaj diye yak koreceptori sho proilyustrovano klasichnim prikladom diyi CD4 yak koreceptora do receptora T klitin TCR dlya zv yazuvannya golovnogo kompleksu gistosumisnosti klasu II MHC II 5 Ce zv yazuvannya osoblivo dobre vivchene v T klitinah de vono sluzhit dlya yih aktivaciyi T klitin yaki perebuvayut u fazi spokoyu abo spokoyu i dlya togo shob aktivni ciklichni T klitini zaznali zaprogramovanoyi zagibeli klitin Boeme ta in prodemonstruvali cej cikavij podvijnij rezultat blokuyuchi zv yazuvannya CD4 z MHC II sho zapobigalo apoptozu yakij zazvichaj vinikaye v aktivnih T klitinah 6 Receptor CD4 skladayetsya z chotiroh konkatamerizovanih Ig podibnih domeniv i prikriplyuyetsya do klitinnoyi membrani za dopomogoyu odnogo transmembrannogo domenu Receptori simejstva CD yak pravilo ye monomerami abo dimerami hocha vsi voni perevazhno ye pozaklitinnimi bilkami Receptor CD4 zokrema vzayemodiye z mishachim MHC II za modellyu kulya na palichci de kulka Phe 43 vpisuyetsya v zberezheni gidrofobni zalishki a2 i b2 domeniv 5 Pid chas zv yazuvannya z MHC II CD4 zberigaye nezalezhnu strukturu i ne utvoryuye zhodnih zv yazkiv z receptorom TCR Chleni simejstva koreceptoriv CD mayut shirokij spektr funkcij Krim togo sho receptor CD4 bere uchast u formuvanni kompleksu z MHC II z TCR shob kontrolyuvati dolyu T klitin receptor CD4 yak vidomo ye osnovnim receptorom z yakim zv yazuyetsya glikoproteyin obolonki VIL GP120 6 Dlya porivnyannya CD28 diye yak kokoreceptor kostimulyatornij receptor dlya zv yazuvannya MHC II z TCR i CD4 CD28 zbilshuye sekreciyu IL 2 z T klitin yaksho vin bere uchast u pochatkovij aktivaciyi odnak blokada CD28 ne vplivaye na zaprogramovanu zagibel klitin pislya togo yak T klitina bula aktivovana 6 Simejstvo receptoriv CCR Redaguvati Simejstvo receptoriv CCR ce grupa receptoriv pov yazanih z g bilkom GPCR yaki zazvichaj pracyuyut yak hemokinovi receptori V osnovnomu voni znahodyatsya na imunologichnih klitinah osoblivo na T klitinah 7 CCR receptori takozh ekspresuyutsya na nejronnih klitinah takih yak dendriti ta mikrogliya 7 Mabut najvidomishim i dobre vivchenim iz simejstva CCR ye CCR5 i jogo majzhe gomolog CXCR4 yakij diye yak osnovnij koreceptor dlya infekciyi VIL 7 8 Glikoproteyin obolonki VIL GP120 zv yazuyetsya z CD4 yak osnovnim receptorom CCR5 potim utvoryuye kompleks z CD4 i VIL sho dozvolyaye virusu proniknuti v klitinu CCR5 ne ye yedinim chlenom simejstva CCR yakij dopuskaye VIL infekciyu Cherez spilnist struktur sho zustrichayutsya v simejstvi CCR2b CCR3 i CCR8 mozhut vikoristovuvatisya deyakimi shtamami VIL yak koreceptori dlya polegshennya infekciyi CXCR4 za strukturoyu duzhe shozhij na CCR5 Hocha lishe deyaki shtami VIL mozhut vikoristovuvati CCR2b CCR3 i CCR8 vsi shtami VIL mozhut infikuvati cherez CCR5 i CXCR4 7 Vidomo sho CCR5 maye sporidnenist do zapalnogo bilka makrofagiv MIP i yak vvazhayut vidigraye rol u zapalnih imunologichnih reakciyah Osnovna rol cogo receptora mensh zrozumila nizh jogo rol u VIL infekciyi oskilki reakciyi na zapalennya zalishayutsya pogano zrozumilim aspektom imunnoyi sistemi 7 8 Sporidnenist CCR5 do MIP robit jogo duzhe cikavim dlya praktichnih zastosuvan takih yak tkaninna inzheneriya de roblyatsya sprobi kontrolyuvati zapalni ta imunologichni reakciyi organizmu gospodarya na rivni klitinnoyi signalizaciyi Sporidnenist do MIP bula vikoristana in vitro dlya zapobigannya VIL infekciyi cherez konkurenciyu ligandiv odnak ci ingibitori proniknennya zaznali nevdachi in vivo cherez visoko adaptivnij harakter VIL ta zanepokoyennya shodo toksichnosti 7 Klinichne znachennya RedaguvatiCherez yih vazhlivist u peredachi signaliv i regulyaciyi klitinami koreceptori zalucheni do ryadu zahvoryuvan i rozladiv Mishi z nokautom koreceptoriv chasto ne zdatni rozvivatisya i taki nokauti zazvichaj prizvodyat do embrionalnoyi abo perinatalnoyi letalnosti 2 Zokrema v imunologiyi termin koreceptor chasto opisuye vtorinnij receptor yakij vikoristovuyetsya patogenom dlya otrimannya dostupu do klitini abo receptor yakij pracyuye razom z receptorami T klitin takimi yak CD4 CD8 abo CD28 shob zv yazuvati antigeni abo regulyuvati pevnim chinom aktivnist T klitin 2 Spadkovi koreceptorni autosomni zahvoryuvannya Redaguvati Bagato rozladiv pov yazanih z koreceptorami vinikayut cherez mutaciyi v geni sho koduye receptor LRP5 bilok 5 pov yazanij z receptorom lipoproteyiniv nizkoyi shilnosti diye yak koreceptor dlya simejstva glikoproteyiniv Wnt yaki regulyuyut kistkovu masu Porushennya roboti cogo koreceptora prizvodyat do znizhennya shilnosti ta micnosti kistok sho spriyaye osteoporozu 9 Vtrata funkcionalnih mutacij v LRP5 bula pov yazana z sindromom osteoporozu psevdogliomi simejnoyu eksudativnoyu vitroretinopatiyeyu a specifichna bezsensova mutaciya v pershij b propelernij dilyanci LRP5 mozhe prizvesti do anomalno visokoyi shilnosti kistki abo osteopetrozu 2 Mutaciyi v LRP1 takozh buli viyavleni u vipadkah simejnoyi hvorobi Alcgejmera 2 Vtrata funkcionalnih mutacij u koreceptori Cryptic mozhe prizvesti do vipadkovogo roztashuvannya organiv cherez defekti rozvitku u oriyentaciyi livo pravoruch 2 Vvazhayetsya sho gigantizm u deyakih vipadkah viklikanij vtratoyu funkciyi koreceptora Glypican 3 2 Rak Redaguvati Molekula adgeziyi klitin karcinoembrionalnogo antigenu 1 Caecam1 ye imunoglobulinopodibnim koreceptorom yakij spriyaye adgeziyi klitin v epitelialnih endotelialnih i gemopoetichnih klitinah i vidigraye zhittyevo vazhlivu rol pid chas vaskulyarizaciyi ta angiogenezu shlyahom zv yazuvannya faktora rostu sudin VEGliF 10 Angiogenez vazhlivij dlya embrionalnogo rozvitku ale ce takozh fundamentalnij proces rostu puhlini Vidalennya gena u mishej Caecam1 prizvodit do zmenshennya anomalnoyi vaskulyarizaciyi sho sposterigayetsya pri raku i znizhennya viroblennya oksidu azotu sho svidchit pro terapevtichnu mozhlivist shlyahom diyi na cej gen 10 Simejstvo koreceptoriv nejropilinu oposeredkovuye zv yazuvannya VEGF u poyednanni z signalnimi receptorami VEGFR1 VEGFR2 ta pleksinu a otzhe takozh vidigraye rol u rozvitku sudinnoyi puhlini 2 CD109 diye yak negativnij regulyator receptora b faktora rostu puhlini TGF b Pislya zv yazuvannya TGF b receptor internalizuyetsya shlyahom endocitozu cherez diyu CD109 sho znizhuye peredachu signalu v klitinu 11 U comu vipadku koreceptor funkcionuye v kritichnomu regulyatornomu rezhimi shob zmenshiti signali yaki instruktuyut klitinu rosti ta migruvati oznaki raku 11 U poyednanni simejstvo koreceptoriv LRP takozh oposeredkovuye zv yazuvannya TGF b z riznimi membrannimi receptorami 2 Interlejkini 1 2 i 5 zalezhat vid koreceptoriv interlejkinu dlya zv yazuvannya z pervinnimi receptorami interlejkinu 2 Sindekani 1 i 4 buli prichetni do riznih tipiv raku vklyuchayuchi rak shijki matki molochnoyi zalozi legeniv i tovstoyi kishki a anomalni rivni ekspresiyi buli pov yazani z poganim prognozom 2 VIL Redaguvati Shob infikuvati klitinu glikoproteyin obolonki GP120 virusu VIL vzayemodiye z CD4 diyuchim yak pervinnij receptor i koreceptorom CCR5 abo CXCR4 Ce zv yazuvannya prizvodit do zlittya membrani ta podalshoyi vnutrishnoklitinnoyi peredachi signaliv sho spriyaye invaziyi virusu 12 Priblizno v polovini vsih vipadkiv VIL virusi yaki vikoristovuyut koreceptor CCR5 mabut spriyayut negajnomu zarazhennyu ta peredachi todi yak ti sho vikoristovuyut receptor CXCR4 z yavlyayutsya lishe piznishe na imunosupresivnij stadiyi hvorobi 12 Virus chasto perehodit vid vikoristannya CCR5 do CXCR4 pid chas perebigu infekciyi sho sluzhit indikatorom progresuvannya zahvoryuvannya 13 Ostanni dani svidchat pro te sho deyaki formi VIL takozh vikoristovuyut velikij receptor integrinu a4b7 dlya pidvishennya efektivnosti zv yazuvannya v tkaninah slizovoyi obolonki 13 Gepatit S Redaguvati Virusu gepatitu S dlya zarazhennya potriben koreceptor CD81 Doslidzhennya pokazuyut sho bilok shilnogo z yednannya Claudin 1 CLDN1 takozh mozhe vidigravati rol u proniknenni cogo virusu Anomaliyi simejstva Klaudin takozh poshireni pri gepatocelyulyarnij karcinomi yaka mozhe buti j rezultatom zarazhennya virusu papilomi lyudini 14 Blokada koreceptoriv yak likuvannya autoimunitetu Redaguvati Isnuye mozhlivist zablokuvati koreceptori CD4 vikoristovuyuchi antitila shob zniziti aktivaciyu T klitin i protidiyati autoimunnim rozladam 15 Cya blokada zdayetsya viklikaye dominuyuchij efekt tobto pislya blokuvannya T klitini ne vidnovlyuyut svoyu zdatnist aktivuvatis Potim cej efekt poshiryuyetsya na nativni T klitini yaki potim perehodyat na T regulyatornij fenotip CD4 CD25 GITR FoxP3 15 Suchasni napryamki doslidzhen RedaguvatiNarazi dvoma najpomitnishimi napryamkami doslidzhennya koreceptoriv ye doslidzhennya shodo VIL ta raku Doslidzhennya shodo VIL zoseredzheni na adaptaciyi shtamiv VIL do riznomanitnih koreceptoriv gospodariv Doslidzhennya raku v osnovnomu zoseredzheni na posilenni imunnoyi vidpovidi na puhlinni klitini a deyaki doslidzhennya takozh vklyuchayut vivchennya receptoriv yaki ekspresuyutsya samimi rakovimi klitinami VIL Redaguvati Bilshist doslidzhen roli koreceptoriv u VIL infekciyi zoseredzheni na koreceptori CCR5 Bilshist shtamiv VIL vikoristovuyut receptor CCR5 16 Shtami VIL 2 takozh mozhut vikoristovuvati receptor CXCR4 17 hocha receptor CCR5 ye perevazhnoyu mishennyu Yak CCR5 tak i CXCR4 koreceptori ye semi transmembrannimi 7TM receptorami pov yazanimi z bilkom G 18 Rizni shtami VIL diyut na rizni koreceptori hocha virus mozhe pereklyuchatisya na vikoristannya inshih koreceptoriv 16 Napriklad receptori R5X4 mozhut stati dominantnoyu mishennyu koreceptoriv VIL u osnovnih shtamiv VIL 1 i VIL 2 mozhut vikoristovuvati koreceptor CCR8 17 Perehreshuvannya mishenej koreceptoriv dlya riznih shtamiv i zdatnist shtamiv pereklyuchatisya zi svogo dominantnogo koreceptora mozhe pereshkodzhati klinichnomu likuvannyu VIL Take likuvannya yak mAb WR321 mozhe ingibuvati deyaki shtami CCR5 VIL 1 zapobigayuchi zarazhennyu klitin 18 mAb viklikaye vivilnennya b hemokiniv sho ingibuyut VIL 1 zapobigayuchi infikuvannyu inshih klitin Rak Redaguvati Doslidzhennya roli koreceptoriv pri zloyakisnih puhlinah vklyuchaye doslidzhennya koreceptoriv sho aktivuyutsya faktorom rostu takih yak koreceptori transformuyuchogo faktora rostu TGF b Ekspresiya koreceptornogo endoglinu yakij ekspresuyetsya na poverhni puhlinnih klitin korelyuye z plastichnistyu klitini ta rozvitkom puhlin 19 Inshim koreceptorom TGF b ye CD8 20 Hocha tochnij mehanizm dosi nevidomij bulo pokazano sho koreceptori CD8 posilyuyut aktivaciyu T klitin i oposeredkovanu TGF b imunnu supresiyu Bulo pokazano sho TGF b vplivaye na plastichnist klitin cherez integrin i kinazu fokalnoyi adgeziyi 19 Koreceptori puhlinnih klitin ta yih vzayemodiya z T klitinami ye vazhlivimi aspektami imunoterapiyi puhlin Neshodavni doslidzhennya koreceptoriv dlya p75 takih yak koreceptor sortilinu pokazali sho sortilin pov yazanij z nejrotrofinami tipom faktora rostu nerviv 21 Bulo viyavleno sho receptor r75 i koreceptori vplivayut na agresivnist puhlin zokrema cherez zdatnist nejrotrofiniv ryatuvati klitini vid pevnih form klitinnoyi zagibeli 22 Sortilin koreceptor r75 buv znajdenij u prirodnih kilerah ale z nizkim rivnem nejrotrofinovogo receptora 23 Vvazhayetsya sho koreceptor sortilinu pracyuye z 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