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Imunoglobulin E IgE tip antitila abo izotip imunoglobulinu Ig yakij buv znajdenij lishe u ssavciv IgE sintezuyetsya plazmatichnimi klitinami Monomeri IgE skladayutsya z dvoh vazhkih lancyugiv e lancyug i dvoh legkih lancyugiv prichomu e lancyug mistit 4 Ig podibni postijni domeni Ce1 Ce4 1 Vvazhayetsya sho IgE ye vazhlivoyu chastinoyu imunnoyi vidpovidi na infekciyu pevnimi parazitichnimi gelmintami vklyuchayuchi Schistosoma mansoni Trichinella spiralis 2 3 i Fasciola hepatica 4 IgE takozh vikoristovuyetsya pid chas imunnogo zahistu vid deyakih najprostishih parazitiv takih yak Plasmodium falciparum 5 V procesi evolyuciyi IgE mozhlivo rozvivavsya yak zahist dlya zahistu vid otrut 6 7 8 Budova antitila IgERol tuchnih klitin u rozvitku alergiyi Proces degranulyaciyi 1 antigen 2 antitilo IgE 3 receptor FceRI 4 vzhe utvoreni mediatori gistamin proteazi hemokini geparin 5 granuli 6 tuchna klitina 7 novoutvoreni mediatori prostaglandini lejkotriyeni tromboksani PAF IgE takozh vidigraye kritichnu rol u giperchutlivosti I tipu 9 yaka proyavlyayetsya riznimi alergichnimi zahvoryuvannyami takimi yak alergichna astma bilshist tipiv sinusitiv alergichnij rinit harchova alergiya ta pevni tipi hronichnoyi kropiv yanki ta atopichnogo dermatitu IgE takozh vidigraye klyuchovu rol u vidpovidyah na alergeni taki yak anafilaktichni reakciyi na liki ukusi bdzhil ta antigenni preparati sho vikoristovuyutsya v desensibilizacijnij imunoterapiyi Hocha IgE zazvichaj ye najmensh poshirenim izotipom rivni IgE v sirovatci krovi u normalnoyi neatopichnoyi lyudini stanovlyat lishe 0 05 vid zagalnoyi koncentraciyi Ig 10 porivnyanni z 75 dlya IgG pri 10 mg ml yaki ye izotipami vidpovidalnimi za bilshist klasichnoyi adaptivnoyi imunnoyi vidpovidi vin zdatnij viklikati anafilaksiyu odnu z najbilsh shvidkih i vazhkih imunologichnih reakcij 11 Zmist 1 Vidkrittya 2 Receptori 3 Funkciya 3 1 Parazitarna gipoteza 3 2 Toksinova gipoteza alergichnogo zahvoryuvannya 3 3 Rak 4 Rol u zahvoryuvanni 4 1 Rol v diagnostici 5 Liki spryamovani na IgE shlyah 6 PrimitkiVidkrittya RedaguvatiIgE buv odnochasno vidkritij u 1966 ta 1967 rokah dvoma nezalezhnimi doslidnickimi grupami 12 Kimisige Ishizaka ta jogo druzhina Teruko Ishizaka v Instituti ta likarni doslidzhennya dityachoyi astmi v Denveri shtat Kolorado 13 ta Johanssonom i Bennihom v Upsali Shveciya 14 Yih spilna stattya bula opublikovana v kvitni 1969 roku 15 Receptori RedaguvatiIgE stimulyuye IgE oposeredkovanu alergichnu vidpovid shlyahom zv yazuvannya z receptorami Fc yaki znahodyatsya na poverhni tuchnih klitin i bazofiliv Fc receptori takozh viyavleni na eozinofilah monocitah makrofagah i trombocitah u lyudej Isnuye dva tipi Fce receptoriv FceRI receptor Fce tipu I visokoafinnij receptor IgE FceRII receptor Fce tipu II takozh vidomij yak CD23 nizkoafinnij receptor IgEIgE mozhe posilyuvati ekspresiyu oboh tipiv receptoriv Fce FceRI ekspresuyetsya na tuchnih klitinah bazofilah ta dendritnih klitinah sho prezentuyut antigen yak u mishej tak i u lyudej Zv yazuvannya antigeniv z IgE uzhe zv yazanim FceRI na tuchnih klitinah viklikaye perehresnij zv yazok vzhe zv yazanogo IgE ta agregaciyu osnovnogo FceRI sho prizvodit do degranulyaciyi vivilnennya mediatoriv ta sekreciyi kilkoh tipiv citokiniv tipu 2 takih yak interlejkin IL 3 i faktor stovburovih klitin SCF yaki dopomagayut tuchnim klitinam vizhivati i nakopichuvatisya v tkaninah a takozh IL 4 IL 5 IL 13 i IL 33 yaki u svoyu chergu aktivuyut vrodzheni limfoyidni klitini grupi 2 ILC2 abo prirodni klitini helperi Bazofili z tuchnimi klitinami mayut zagalnogo gemopoetichnogo poperednika pri perehresnomu zv yazku yih poverhnevogo zv yazanogo IgE antigenami takozh vivilnyayut citokini 2 tipu vklyuchayuchi IL 4 ta IL 13 ta inshi mediatori zapalennya Nizkoafinnij receptor FceRII zavzhdi ekspresuyetsya na V klitinah ale IL 4 mozhe indukuvati jogo ekspresiyu na poverhnyah makrofagiv eozinofiliv trombocitiv i deyakih T klitin 16 17 Funkciya RedaguvatiParazitarna gipoteza Redaguvati Izotip IgE spilno evolyucionuvav z bazofilami ta tuchnimi klitinami dlya zahistu vid parazitiv takih yak gelminti napriklad shistosoma ale takozh mozhe buti efektivnim pri bakterialnih infekciyah Epidemiologichni doslidzhennya pokazuyut sho riven IgE pidvishuyetsya pri zarazhenni lyudini Schistosoma mansoni 18 Necator americanus en 19 i nematodami 20 Takozh IgE shvidshe za vse dopomagaye vidalennyu ankilostom z legeniv Toksinova gipoteza alergichnogo zahvoryuvannya Redaguvati U 1981 roci Mardzhi Profet pripustila sho alergichni reakciyi rozvivalisya yak ostannya liniya zahistu dlya zahistu vid otrut 6 Hocha cya gipoteza na toj chas bula superechlivoyu nova robota pidtverdzhuye deyaki dumki Profet pro adaptacijnu rol alergiyi yak zahistu vid toksiniv 7 U 2013 roci z yasuvalosya sho IgE vidigrayut vazhlivu rol u nabutij stijkosti do otrut medonosnih bdzhil 8 ta gadyuki Rassela 8 21 Avtori dijshli visnovku sho nevelika doza bdzholinoyi otruti nadaye imunitet do znachno bilshoyi smertelnoyi dozi i takij vid specifichnoyi dlya otruti pov yazanoyi z IgE adaptivnoyi imunnoyi vidpovidi rozvinuvsya prinajmni v evolyucijnomu plani shob zahistiti hazyayina vid potencijno toksichni kilkosti otruti napriklad yaksho tvarina zitknetsya z cilim gnizdom bdzhil abo v razi ukusu zmiyi 8 22 23 Osnovnij alergen bdzholinoyi otruti fosfolipaza A2 viklikaye imunnu vidpovid T helperiv 2 go tipu pov yazanu z viroblennyam antitil IgE yaki mozhut pidvishiti stijkist mishej do zarazhennya potencijno smertelnimi dozami toksina 24 Rak Redaguvati Hocha ce she nedostatno vivchene IgE mozhe vidigravati vazhlivu rol u rozpiznavanni zloyakisnih puhlin 25 pri yakomu mozhliva stimulyaciya silnoyi citotoksichnoyi vidpovidi proti klitin yaki demonstruyut lishe neveliku kilkist rannih markeriv raku Yaksho cya gipoteza virna likuvannya preparatami proti IgE take yak omalizumab dlya likuvannya alergiyi teoretichno mozhe mati deyaki nebazhani pobichni efekti Odnak nedavnye doslidzhennya yake bulo provedeno na osnovi sukupnogo analizu z vikoristannyam vicherpnih danih iz 67 klinichnih viprobuvan fazi I IV omalizumabu za riznimi pokazannyami prijshlo do visnovku sho prichinnij zv yazok mizh terapiyeyu omalizumabom ta zloyakisnimi novoutvorennyami ye malojmovirnim 26 Rol u zahvoryuvanni RedaguvatiU lyudej z atopiyeyu riven IgE v krovi mozhe v desyat raziv perevishuvati normalnij riven yak i u hvorih na sindrom giper IgE Odnak ce mozhe ne buti obov yazkovoyu umovoyu dlya poyavi simptomiv yak ce sposterigayetsya u astmatikiv z normalnim rivnem IgE v krovi neshodavni doslidzhennya pokazali sho viroblennya IgE mozhe vidbuvatisya lokalno v slizovij obolonci nosa 27 IgE yakij mozhe specifichno rozpiznati alergen yak pravilo ce bilok napriklad pilovogo klisha Der p 1 kotyachij bilok Fel d 1 pilok trav abo ambroziyi tosho maye unikalnu dovgotrivalu vzayemodiyu zi svoyim visokoafinnim receptorom FceRI tomu sho bazofili i tuchni klitini zdatni oposeredkovuvati zapalni reakciyi stayut pidgotovlenimi shob vidilyati himichni rechovini taki yak gistamin lejkotriyeni ta pevni interlejkini Vkazani himichni rechovini mediatori viklikayut bagato simptomiv yaki mi pov yazuyemo z alergiyeyu takih yak zvuzhennya dihalnih shlyahiv pri astmi misceve zapalennya pri ekzemi posilene vidilennya slizu pri alergichnomu riniti ta pidvishena proniknist sudin neobhidne dlya perehodu u tkanini inshih imunnih klitin yake mozhe prizvesti do potencijno smertelnogo padinnya arterialnogo tisku kolaps yak pri anafilaksiyi Vidomo sho riven IgE pidvishuyetsya pri riznih autoimunnih zahvoryuvannyah takih yak sistemnij chervonij vovchak SChV revmatoyidnij artrit RA i psoriaz i teoretichno maye patogenetichne znachennya pri SChV i RA viklikayuchi reakciyu giperchutlivosti 28 29 Vvazhayetsya sho regulyaciya rivnya IgE za dopomogoyu kontrolyu diferenciyuvannya V klitin u plazmatichni klitini sho sekretuyut antitila vklyuchaye nizkoafinnij receptor FceRII abo CD23 30 CD23 takozh mozhe zabezpechuvati polegshenu prezentaciyu antigenu IgE zalezhnij mehanizm za dopomogoyu yakogo V klitini sho ekspresuyut CD23 zdatni prezentuvati alergen i stimulyuvati specifichni T helperi viklikayuchi zberezhennya vidpovidi Th2 odniyeyu z oznak yakoyi ye viroblennya bilshoyi kilkosti antitil 31 Rol v diagnostici Redaguvati Diagnostika alergiyi najchastishe provoditsya shlyahom vivchennya istoriyi hvorobi lyudini ta viyavlennya pozitivnogo rezultatu na nayavnist alergen specifichnogo IgE pri provedenni shkirnogo abo analizu krovi 32 Test na specifichnij IgE ye perevirenim testom dlya viyavlennya alergiyi Nemaye dokaziv sho nevibirkove testuvannya na IgE abo test na imunoglobulin G IgG mozhe pidtverditi diagnoz alergiyi 33 Liki spryamovani na IgE shlyah RedaguvatiV danij chas alergichni zahvoryuvannya ta astmu zazvichaj likuyut odnim abo kilkoma z nastupnih preparativ 1 antigistaminni ta antilejkotriyenni yaki ye antagonistami mediatoriv zapalennya gistaminu i lejkotriyeniv 2 miscevi abo sistemni peroralni abo in yekcijni kortikosteroyidi yaki prignichuyut shirokij spektr zapalnih mehanizmiv 3 bronhodilatatori korotkoyi abo trivaloyi diyi yaki rozslablyuyut gladku muskulaturu zvuzhenih dihalnih shlyahiv pri astmi abo 4 stabilizatori tuchnih klitin yaki prignichuyut degranulyaciyu tuchnih klitin yaka zazvichaj iniciyuyetsya zv yazuvannyam IgE do FceRI Vidomo sho trivale zastosuvannya sistemnih kortikosteroyidiv viklikaye bagato serjoznih pobichnih efektiv i yih rekomenduyetsya unikati yaksho dostupni alternativni metodi likuvannya Sam IgE shlyah sintezu IgE ta IgE oposeredkovanij alergichnij zapalnij shlyah ye vazhlivimi mishenyami dlya vtruchannya v patologichni procesi pri alergiyi astmi ta inshih IgE oposeredkovanih zahvoryuvannyah Shlyah diferenciyuvannya ta dozrivannya V limfocitiv yaki v kincevomu pidsumku generuyut plazmatichni klitini sho sekretuyut IgE prohodit promizhni etapi V limfoblasti sho ekspresuyut IgE vzayemodiya z V klitinami pam yati sho ekspresuyut IgE Tanox biotehnologichna kompaniya sho bazuyetsya v H yustoni shtat Tehas zaproponuvala v 1987 roci sho shlyahom nacilyuvannya na membranno zv yazanij IgE mIgE na V limfoblastah i V klitinah pam yati ci klitini mozhna lizuvati abo regulyuvati takim chinom dosyagayuchi prignichennya virobnictva antigen specifichnih IgE i otzhe zsuvu imunnogo balansu v bik ne IgE mehanizmiv 34 Bulo rozrobleno dva pidhodi spryamovani na shlyah IgE yaki perebuvayut v aktivnij rozrobci U pershomu pidhodi anti IgE antitilo omalizumab torgova nazva Xolair rozpiznaye IgE ne pov yazanij zi svoyimi receptorami nejtralizuye isnuyuchij IgE i ne dopuskaye jogo zv yazuvannya z receptorami na tuchnih klitinah i bazofilah Xolair buv shvalenij u bagatoh krayinah dlya likuvannya vazhkoyi stijkoyi alergichnoyi astmi Vin takozh buv shvalenij u berezni 2014 roku v Yevropejskomu Soyuzi 35 ta SShA 36 dlya likuvannya hronichnoyi spontannoyi kropiv yanki yaku nemozhlivo adekvatno likuvati anti H1 preparatami Za drugim pidhodom buli 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vauthors dovidka Otrimano z https uk wikipedia org w index php title Imunoglobulin E amp oldid 39279184