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Gemoglobin vid grec aἷma translit haima krov i lat globus kulya in skorocheno Hb abo Hgb zalizovmisnij kisnevo transportnij metaloproteyin v eritrocitah chervonih krov yanih tilcyah bilshosti hrebetnih 1 za vinyatkom rodini rib Bilokrivkovi 2 ta tkaninah deyakih bezhrebetnih Gemoglobin u krovi perenosit kisen vid dihalnih organiv napriklad legen abo zyaber do reshti tila tobto tkanin Tam vin vivilnyaye kisen shobi zabezpechiti aerobne dihannya yake svoyeyu chergoyu zabezpechuye energiyu zadlya vikonannya funkcij organizmu v procesi yakij maye nazvu obmin rechovin U zdorovomu oraganizmi na 100 ml krovi mistitsya vid 12 do 20 gram gemoglobinu Gemoglobin geterotetramer ab 2 Struktura gemoglobinu lyudini a i b subodinici mayut chervonij i sinij kolir vidpovidno a zalizovmisni gemovi grupi zelenij Vzyato z PDB 1GZX Proteopediya HemoglobinTip bilka metaloproteyin globulinFunkciya transport kisnyuKofaktori gem 4 Nazva subodinici Gen Lokus hromosomiHb a1 HBA1 Hr 16 p13 3Hb a2 HBA2 Hr 16 p13 3Hb b HBB Hr 11 p15 5U ssavciv hromoproteyin stanovit blizko 96 suhogo vmistu eritrocitiv za vagoyu i blizko 35 zagalnogo yih vmistu vrahovuyuchi vodu 3 Gemoglobin maye zdatnist priv yazati do sebe 1 34 ml O2 na gram rechovini 4 sho zbilshuye zagalnu yemnist kisnyu v krovi u 70 raziv porivnyuyuchi z prosto rozchinenim u krovi kisnem Molekula gemoglobinu ssavciv mozhe priv yazati perenesti do 4 molekul kisnyu 5 Gemoglobin takozh zaluchenij do transportu inshih gaziv vin perenosit chastinu vuglekislogo gazu blizko 20 25 zagalnoyi kilkosti 6 u viglyadi karbogemoglobina u yakomu CO2 priv yazuyetsya do gemoproteyina Molekula takozh perenosit vazhlivu regulyatornu molekulu oksid azotu II NO zv yazanu z tiolovoyu grupoyu bilka globinu vivilnyayuchi jogo odnochasno z kisnem 7 Gemoglobin takozh buv znajdenij za mezhami eritrocitiv i yih progenitornih linij Sered inshih klitin yaki mistyat gemoglobin ye dofaminergichni nejroni A9 u chornij rechovini makrofagi klitini alveol legeni pigmentnij epitelij sitkivki gepatociti klitini nirkovogo mezangiya klitini endometriya klitini shijki matki i vaginalni epitelialni klitini 8 U cih tkaninah gemoglobin vikonuye ne kisnevo transportnu funkciyu a funkciyi antioksidanta i regulyatora metabolizmu zaliza 9 Nadmirnij vmist glyukozi v krovi mozhe priyednatisya do gemoglobinu i pidvishiti riven gemoglobinu A1c 10 Gemoglobin i gemoglobinopodibni molekuli takozh nayavni v bagatoh bezhrebetnih gribiv i roslin 11 U cih organizmiv gemoglobin mozhe perenositi kisen abo transportuvati ta regulyuvati inshi mali molekuli ta ioni taki yak vuglekislij gaz oksid azotu sirkovoden ta sulfid Variant molekuli yakij nazivayetsya legoglobin vikoristovuyetsya dlya vidalennya kisnyu z anaerobnih sistem takih yak azot fiksuyuchi klubni bobovih roslin shob kisen ne otruyiv deaktivuvav sistemu Gemoglobinemiya ce medichnij stan pri yakomu sposterigayetsya nadlishok gemoglobinu v plazmi krovi Ce ye efektom vnutrishnosudinnogo gemolizu pri yakomu gemoglobin viddilyayetsya vid eritrocitiv forma anemiyi Zmist 1 Istoriya doslidzhen 2 Genetika 3 Sintez 4 Struktura gemu 4 1 Nasichennya kisnem 4 1 1 Oksigemoglobin 4 1 2 Dezoksigemoglobin 5 Fiziologichna rol 6 Evolyuciya gemoglobinu u hrebetnih 7 Tipi v lyudej 8 Hvorobi pov yazani z gemoglobinom 9 Div takozh 10 Primitki 11 Literatura 12 PosilannyaIstoriya doslidzhen Redaguvati nbsp Maks Ferdinand Peruc otrimav Nobelivsku premiyu z himiyi za svoyu robotu z viznachennya molekulyarnoyi strukturi gemoglobinu i mioglobinu 12 1825 roku Jogan Fridrih Engelgart viyaviv sho spivvidnoshennya zaliza do bilka odnakove v gemoglobinah kilkoh vidiv 13 14 Z vidomoyi atomnoyi masi zaliza vin obchisliv molekulyarnu masu gemoglobinu do n 16000 n kilkist atomiv zaliza v molekuli gemoglobinu zaraz vidomo sho yih 4 pershe viznachennya molekulyarnoyi masi bilka Cej pospishnij visnovok viklikav bagato nasmishok u vchenih yaki ne mogli poviriti sho yakas molekula mozhe buti nastilki velikoyu Gilbert Smitson Ader pidtverdiv rezultati Engelgarta 1925 roku vimiryuvannyam osmotichnogo tisku rozchiniv gemoglobinu 15 Hocha pro te sho krov perenosit kisen bulo vidomo she z 1794 roku 16 17 vlastivist gemoglobinu perenositi kisen bula opisana Gyunfeldom 1840 roku 18 1851 roku nimeckij fiziolog Otto Funke opublikuvav seriyu statej u yakih vin opisav viroshuvannya kristaliv gemoglobinu shlyahom poslidovnogo rozvedennya eritrocitiv takim rozchinnikom yak chista voda spirt abo efir z nastupnim povilnim viparovuvannyam rozchinnika z otrimanogo rozchinu bilka 19 20 Kilka rokiv potomu bulo opisano oborotnu oksigenaciyu oksigenaciya gemoglobinu priyednennya kisnyu do zaliza v gemi gemoglobinu Feliksom Goppe Zejlerom 21 Zavdyaki rozvitku rentgenostrukturnogo analizu stalo mozhlivim sekvenuvannya bilkovih struktur 22 1959 roku Maks Ferdinand Peruc viznachiv molekulyarnu strukturu gemoglobinu 23 24 Cya robota prizvela do togo sho vin razom iz Dzhonom Kendryu 1962 roku otrimav Nobelivsku premiya z himiyi za doslidzhennya strukturi globulyarnih bilkiv Rol gemoglobinu v krovi bula z yasovana francuzkim fiziologom Klodom Bernarom Nazva gemoglobin pishla vid sliv gem i globin vidobrazhayuchi toj fakt sho kozhna subodinicya gemoglobinu ye globulyarnim bilkom zi vbudovanoyu gemovoyu grupoyu Kozhna gemova grupa mistit odin atom zaliza yakij mozhe priv yazati odnu molekulu kisnyu za dopomogoyu dipolnih sil sprichinenih ionami Najbilsh poshirenij tip gemoglobinu u ssavciv mistit 4 takih subodinici Genetika RedaguvatiGemoglobin skladayetsya z bilkovih subodinic molekul globiniv i ci bilki u svoyu chergu ye skladenimi lancyuzhkami z velikoyi kilkosti riznomanitnih aminokislot tomu yih nazivayut polipeptidi Aminokislotna poslidovnist bud yakogo polipeptidu stvorenogo klitinoyu u svoyu chergu viznachayetsya dilyankami DNK yaki nazivayutsya genami U vsih bilkah same aminokislotna poslidovnist viznachaye himichni vlastivosti ta funkciyu bilka Geniv gemoglobinu isnuye dekilka u lyudej gemoglobin A osnovna forma gemoglobinu v doroslih koduyetsya genami HBA1 HBA2 ta HBB 25 Subodinici gemoglobinu alfa 1 i alfa 2 koduyutsya genami HBA1 i HBA2 vidpovidno yaki obidva roztashovani na hromosomi 16 blizko odin do odnogo Subodinicya gemoglobinu beta koduyetsya genom HBB roztashovanim na hromosomi 11 Aminokislotni poslidovnosti bilkiv globinu v gemoglobinah zazvichaj riznyatsya mizh vidami Ci vidminnosti zrostayut z evolyucijnoyu vidstannyu mizh vidami Napriklad najposhirenishi poslidovnosti gemoglobinu u lyudej bonobo i shimpanze povnistyu identichni navit bez zhodnoyi vidminnoyi aminokisloti v lancyugah bilka alfa abo beta globinu 26 27 28 U toj chas yak gemoglobin lyudini i gorili vidriznyayutsya odniyeyu aminokislotoyu yak v alfa tak i v beta lancyugah ci vidminnosti zbilshuyutsya mizh mensh sporidnenimi vidami Navit useredini vidu isnuyut rizni varianti gemoglobinu hocha odna poslidovnist zazvichaj ye najbilsh poshirenoyu v kozhnomu vidi mutaciyi v genah bilka gemoglobinu prizvodyat do poyavi variantiv gemoglobinu vseredini vidiv 29 30 Bilshist iz cih mutantnih form gemoglobinu ne viklikayut zahvoryuvan Odnak deyaki z nih viklikayut grupu spadkovih zahvoryuvan gemoglobinopatiyu Najbilsh vidomoyu gemoglobinopatiyeyu ye serpopodibnoklitinna anemiya yaka stala pershoyu lyudskoyu hvoroboyu chij mehanizm bulo doslidzheno i zrozumilo na molekulyarnomu rivni Bilshist vidiv talasemiyi vinikayut cherez nedostatnyu kilkist viroblenogo normalnogo a inodi j anormalnogo gemoglobinu cherez problemi abo mutaciyi v regulyaciyi ekspresiyi geniv globiniv Usi ci zahvoryuvannya prizvodyat do anemiyi 31 nbsp Bilkove virivnyuvannya lyudskogo gemoglobina alfa beta i delta subodinic vidpovidno Virivnyuvannya bulo stvorene z vikoristannyam instrumentu UniProt dostupnogo onlajnVariaciyi v poslidovnostyah aminokislot gemoglobinu yak i inshih bilkiv mozhut buti viklikanimi adaptaciyami organizmu Napriklad bulo viyavleno sho gemoglobin po riznomu adaptuyetsya do velikih visot Organizmi sho zhivut na velikih visotah vidchuvayut nizhchij parcialnij tisk kisnyu v porivnyanni z organizmami sho zhivut na rivni morya Ce ye problemoyu dlya organizmiv yaki naselyayut take seredovishe oskilki gemoglobin yakij zazvichaj zv yazuyetsya z kisnem pri visokomu parcialnomu tisku povinen buti zdatnim zv yazuvatisya z kisnem pri nizhchomu Rizni organizmi pristosuvalisya do cogo vikliku Napriklad neshodavni doslidzhennya pokazali genetichni vidminnosti v bilonogih hom yachkiv yaki dopomagayut poyasniti yak voni zhivuchi v gorah zdatni vizhivati v tamteshnomu rozridzhenomu povitri Doslidnik iz Universitetu Nebraski Linkolna znajshov mutaciyi v 4 riznih genah sho mozhe poyasniti vidminnosti mizh bilonogimi hom yachkami yaki zhivut u nizinnih preriyah timi yaki zhivut u gorah Pislya doslidzhennya dikih mishej vilovlenih yak u visokogirnih tak i v nizinnih rajonah bulo viyavleno sho geni dvoh grup praktichno identichni za vinyatkom tih yaki viznachayut zdatnist yihnogo gemoglobinu perenositi kisen Genetichna riznicya dozvolyaye visokogirnim misham bilsh efektivno vikoristovuvati svij kisen oskilki jogo menshe dostupno na bilshih visotah napriklad u gorah 32 Gemoglobin mamontiv mav mutaciyi yaki zabezpechuvali dostavku kisnyu za nizkih temperatur sho dozvolyalo yim migruvati do vishih shirot u plejstocenovij eposi 33 Shozhi mutaciyi takozh bulo viyavleno u kolibri yaki naselyayut Andi Kolibri vitrachayut bagato energiyi i otzhe mayut visoku potrebu v kisni ale bulo viyavleno sho kolibri v Andah poshireni na velikih visotah Nesinonimichni mutaciyi v geni gemoglobinu bagatoh vidiv sho zhivut na znachnih visotah Oreotrochilus A castelnaudii C violifer P gigas i A viridicuada prizveli do togo sho bilok maye menshu sporidnenist iz inozitolgeksafosfatom IHP molekuloyu znajdenoyu u ptahiv yaka vikonuye podibnu rol yak 2 3 BPG u lyudej ce prizvodit do zdatnosti zv yazuvatisya z kisnem pri nizhchih parcialnih tiskah 34 Ptashini unikalni krovonosni legeni takozh pidvishuyut efektivnist vikoristannya kisnyu pri nizkih parcialnih tiskah O2 Ci dvi adaptaciyi pidsilyuyut odna odnu i poyasnyuyut chudovu produktivnist ptahiv na velikij visoti Adaptaciyi v gemoglobini nayavni j u lyudej U tibetskih zhinok yaki zhivut na visoti 4000 m nad rivnem morya iz genotipom yakij pidvishuye saturaciyu sposterigayetsya vishij riven vizhivannya potomstva 35 Prirodnij vidbir zdayetsya ye osnovnoyu siloyu sho diye na cej gen oskilki riven smertnosti nashadkiv znachno nizhchij u zhinok iz vishoyu sporidnenistyu gemoglobinu ta kisnyu v porivnyanni z rivnem smertnosti potomstva v zhinok iz nizkoyu takoyu sporidnenistyu Hocha tochnij genotip i mehanizm za dopomogoyu yakogo ce vidbuvayetsya she ne yasni vidbir vplivaye na zdatnist gemoglobinu cih zhinok zv yazuvatisya z kisnem pri nizkomu parcialnomu tisku sho v cilomu dozvolyaye yim krashe pidtrimuvati vazhlivi metabolichni procesi Sintez RedaguvatiSintezu gemoglobinu Hb pereduye skladna seriya krokiv Gemova chastina sintezuyetsya v mitohondriyah i citozolyah nezrilih eritrocitiv todi yak bilovi chastini globini sintezuyutsya ribosomami v citozoli 36 Viroblennya gemoglobinu prodovzhuyetsya u klitini protyagom usogo yiyi rannogo rozvitku vid proeritroblastu do retikulocita v kistkovomu mozku U cej moment u ssavciv klitinne yadro eritrocitiv vtrachayetsya ale ne u ptahiv i bagatoh inshih vidiv Navit pislya vtrati yadra u ssavciv zalishkova ribosomna RNK dozvolyaye podalshij sintez gemoglobinu dopoki retikulocit ne vtratit svoyi RNK nezadovgo pislya potraplyannya do sudin cya gemoglobin sintetichna RNK naspravdi nadaye retikulocitu jogo sitchastij viglyad i vidpovidno nazvu yaka pohodit vid angl reticulated sitchastij 37 Struktura gemu Redaguvati nbsp Gemova b grupaGemoglobin maye chetvertinnu strukturu harakternu dlya bagatoh globulyarnih bilkiv sho mistyat bagato subodinic 38 Bilshist aminokislot u skladi gemoglobinu utvoryuyut alfa spirali i ci spirali z yednani korotkimi nespiralnimi segmentami Vodnevi zv yazki stabilizuyut spiralni dilyanki vseredini cogo bilka viklikayuchi tyazhinnya vseredini molekuli sho potim zmushuye kozhen polipeptidnij lancyug zgortatisya v pevnu formu 39 Chetvertinna struktura gemoglobinu pohodit vid jogo chotiroh subodinic yaki mayut priblizno tetraedrichnu strukturu 38 U bilshosti hrebetnih molekula gemoglobinu skladayetsya iz chotiroh subodinic globulyarnih bilkiv Kozhna subodinicya skladayetsya z bilkovogo lancyuga tisno z yednanogo z nebilkovoyu prostetichnoyu gemovoyu grupoyu Kozhen bilkovij lancyug skladayetsya z mnozhini alfa spiralnih strukturnih segmentiv z yednanih razom u globin Taku nazvu bulo dano tomu sho taka organizaciya maye toj samij princip zgortannya yak i v inshih bilkiv gem globin takih yak mioglobin 40 41 U rezultati takogo zgortannya utvoryuyetsya kishenya do yakoyi micno priv yazuyetsya gemova grupa Gemova grupa skladayetsya z iona zaliza Fe roztashovanogo v geterociklichnomu kilci vidomogo yak porfirin Ce porfirinove kilce skladayetsya z chotiroh molekul pirolu ciklichno z yednanih razom metinovimi mistkami z ionom zaliza zv yazanim u centri 42 Ion zaliza yakij ye miscem priv yazuvannya kisnyu z yednanij iz chotirma atomami azotu v centri kilcya yaki vsi znahodyatsya v odnij ploshini Gem micno kovalentno z yednanij iz globulyarnim bilkom za dopomogoyu atomiv azotu N kilcya imidazolu zalishku F8 gistidinu takozh vidomogo yak proksimalnij gistidin pid porfirinovim kilcem Shosta poziciya mozhe oborotno priv yazuvati kisen za dopomogoyu donorno akceptornogo zv yazku 43 zavershuyuchi oktaedrichnu grupu z shesti ligandiv Ce oborotne zv yazuvannya z kisnem ye prichinoyu takoyi koristi gemoglobinu v transportuvanni kisnyu po tilu 44 Odin atom kisnyu zv yazuyetsya z Fe a inshij vistupaye i utvoryuye kut Koli kisen ne priv yazanij duzhe slabko zv yazana molekula vodi zapovnyuye vilne misce utvoryuyuchi spotvorenij oktaedr Nezvazhayuchi na te sho vuglekislij gaz perenositsya gemoglobinom vin ne konkuruye z kisnem za poziciyi sho zv yazuyut zalizo a zv yazuyetsya z aminnimi grupami bilkovih lancyugiv priyednanih do gemovih grup Stan atoma zaliza mozhe buti abo Fe2 abo Fe3 ale ferrigemoglobin metgemoglobin Fe3 ne zdaten priyednuvati kisen 45 Pri zv yazuvanni kisen timchasovo i oborotno vistupaye v roli okisnika Fe2 na Fe3 pri comu timchasovo peretvoryuyuchis na ion superoksidu Takim chinom dlya zv yazuvannya kisnyu zalizo povinne mati stupin okisnennya 2 Yaksho ion superoksidu priyednanij do Fe3 protonouyetsya zalizo v gemoglobini zalishitsya okisnenim i nezdatnim priyednati kisen U takih vipadkah ferment metgemoglobinreduktazi zmozhe v kincevomu pidsumku reaktivuvati metgemoglobin vidnovivshi atom zaliza U doroslih lyudej najbilsh poshirenim tipom gemoglobinu ye tetramer yakij mistit 4 bilkovih subodinici yakij nazivayetsya gemoglobin A yakij skladayetsya z dvoh a i dvoh b subodinic z yednanih nekovalentno kozhen iz yakih skladayetsya zi 141 i 146 aminokislotnih zalishkiv vidpovidno Ce poznachayetsya yak a2b2 Subodinici ye strukturno shozhimi ta mayut priblizno odnakovij rozmir Kozhna subodinicya maye molekulyarnu masu priblizno 16 000 a o m 46 pri comu zagalna molekulyarna masa vsogo tetrameru stanovit 64 000 a o m 64 458 g mol 47 Tak 1 g dl gram na decilitr 0 1551 mmol litr milimol na litr Gemoglobin A ye najbilsh vivchenoyu z molekul gemoglobinu U ditej grudnogo viku molekula gemoglobinu skladayetsya z dvoh a lancyugiv i dvoh g lancyugiv g lancyugi postupovo zaminyuyutsya b lancyugami u miru zrostannya ditini 48 4 polipeptidnih lancyugi z yednani mizh soboyu solovimi mistkami vodnevimi zv yazkami i gidrofobnoyu vzayemodiyeyu Nasichennya kisnem Redaguvati Zagalom gemoglobin mozhe buti nasichenij molekulami kisnyu oksigemoglobin abo nenasichenij dezoksigemoglobin 49 Oksigemoglobin Redaguvati Oksigemoglobin utvoryuyetsya pid chas fiziologichnogo dihannya koli kisen zv yazuyetsya z gemovoyu chastinkoyu bilka gemoglobinu v eritrocitah Cej proces vidbuvayetsya v legenevih kapilyarah sho prilyagayut do legenevih alfeol Kisen peremishuyetsya cherez krov yanij potik shob potrapiti do klitin de vin vikoristovuyetsya yak kincevij akceptor elektroniv u virobnictvi ATF procesom okisnogo fosforilyuvannya Odnak ce ne dopomagaye protidiyati znizhennyu pH krovi Dihannya mozhe zminiti take stanovishe vivedennyam vuglekislogo gazu takim chinom sprichinayuchi zsuv u pH 50 Gemoglobin isnuye v dvoh formah natyagnutij napruzhenij formi T i rozslablenij formi R Bagato faktoriv taki yak nizkij pH visokij riven CO2 i 2 3 bisfosfoglicerinovoyi kisloti 2 3 BPG u tkaninah spriyayut natyagnutij formi yaka maye nizku sporidnenist iz kisnem ta vivilnyaye jogo u tkaninah I navpaki visokij pH nizkij riven CO2 abo 2 3 BPG u tkaninah spriyaye rozslablenij formi yaka mozhe krashe priyednuvati kisen 51 Parcialnij tisk sistemi takozh vplivaye na sporidnenist iz O2 Velikij parcialnij tisk kisnyu yak napriklad v alveolah spriyaye rozslablenomu visoka sporidnenist R stanu I navpaki nizkij parcialnij tisk yak napriklad u tkaninah yakim potribnij kisen spriyaye natyagnutomu nizka sporidnenist T stanu 52 Krim togo zv yazuvannya kisnyu z gemom iz atomom zaliza Fe2 tyagne zalizo v ploshinu porfirinovogo kilcya viklikayuchi nevelikij konformacijnij zsuv Zsuv sponukaye kisen zv yazuvatisya z troma gemovimi odinicyami sho zalishilisya v gemoglobini takim chinom zv yazuvannya kisnyu ye kooperativnim Dezoksigemoglobin Redaguvati Dezoksigemoglobin forma gemoglobinu bez priyednanogo kisnyu Absorbcijni spektri oksigemoglobinu i dezoksigemoglobinu vidriznyayutsya Oksigemoglobin maye znachno nizhche poglinannya pri dovzhini hvili 660 nm todi yak pri 940 nm jogo poglinannya trohi vishe Cya riznicya vikoristovuyetsya dlya vimiryuvannya kilkosti kisnyu v krovi paciyenta instrumentom yakij nazivayetsya pulsoksimetr Cya riznicya takozh poyasnyuye proyavi cianozu sino fioletovij kolir yakogo nabuvayut klitini pri gipoksiyi 53 Dezoksigemoglobin ye paramagnetikom vin slabo prityaguyetsya magnitnimi polyami 54 55 Natomist oksigemoglobin proyavlyaye diamagnetizm slabke vidshtovhuvannya vid magnitnogo polya 55 Fiziologichna rol RedaguvatiGemoglobin ye odnim z osnovnih bilkiv yakimi harchuyutsya plazmodiyi malyariyi i v endemichnih shodo malyariyi rajonah zemnoyi kuli velmi poshireni spadkovi anomaliyi budovi gemoglobinu sho uskladnyuyut malyarijnim plazmodiyam zhivlennya cim bilkom i proniknennya do eritrocitiv Zokrema do takih anomalij sho mayut evolyucijno pristosovne znachennya vidnositsya serpopodibnoklitinna anemiya Prote na zhal ci anomaliyi yak i anomaliyi budovi gemoglobinu sho ne mayut yavno pristosovnogo znachennya suprovodzhuyutsya porushennyam funkciyi transportu kisnyu gemoglobinom znizhennyam stijkosti eritrocitiv do rujnuvannya anemiyeyu ta inshimi negativnimi naslidkami Anomaliyi budovi gemoglobinu nazivayutsya gemoglobinopatiyami Gemoglobin visoko toksichnij pri popadanni znachnoyi jogo kilkosti z eritrocitiv v plazmu krovi sho vidbuvayetsya pri masivnomu vnutrishnosudinnomu gemolizi gemoragichnomu shoci gemolitichnih anemiyah perelivanni nesumisnoyi krovi ta inshih patologichnih stanah Toksichnist gemoglobinu sho znahoditsya poza eritrocitami u vilnomu stani v plazmi krovi viyavlyayetsya tkaninnoyu gipoksiyeyu pogirshennyam kisnevogo postachannya tkanin perevantazhennyam organizmu produktami rujnuvannya gemoglobinu zalizom bilirubinom porfirinami z rozvitkom zhovtyanici abo gostroyu porfiriyi zakuporkoyu nirkovih kanalciv velikimi molekulami gemoglobinu z rozvitkom nekrozu nirkovih kanalciv i gostroyi nirkovoyi nedostatnosti Zvazhayuchi na gaptoglobin sho specifichno zv yazuye vilnij globin i globin u skladi gemoglobinu Kompleks gaptoglobinu i globinu abo gemoglobinu potim zahoplyuyetsya selezinkoyu i makrofagami tkaninnoyi retikulo endotelialnoyi sistemi i zneshkodzhuyetsya Inshoyu chastinoyu gemoglobinozneshkodzhuyuchoyi sistemi ye bilok gemopeksin sho specifichno zv yazuye vilnij gem i gem u skladi gemoglobinu Kompleks gemu abo gemoglobinu i gemopeksinu potim zahoplyuyetsya pechinkoyu gem vidsheplyuyetsya i vikoristovuyetsya dlya sintezu bilirubinu ta inshih zhovchnih pigmentiv abo vipuskayetsya v recirkulyaciyu v kompleksi z transferinom dlya povtornogo vikoristannya kistkovim mozkom v procesi eritropoezu Evolyuciya gemoglobinu u hrebetnih RedaguvatiNaukovci pogodzhuyutsya sho podiya yaka viddilila mioglobin vid gemoglobinu vidbulasya pislya togo yak minogopodibni vidokremilisya vid shelepnih 56 Cej podil mioglobinu i gemoglobinu dozvoliv viniknuti i rozvinuti rizni funkciyi dvoh molekul mioglobin bilshe pov yazanij zi zberigannyam kisnyu todi yak gemoglobin vidpovidaye za jogo transportuvannya 57 Geni a i b podibnogo globinu koduyut okremi subodinici bilka 25 Poperedniki cih geniv zavdyaki inshij duplikaciyi takozh pislya togo yak spilnij predok gnatosom vidokremivsya vid bezshelepnih rib priblizno 450 500 miljoniv rokiv tomu 56 Doslidzhennya z vidnovlennya predkiv pripuskayut sho predkom preduplikaciyi a i b geniv buv dimer sho skladavsya z identichnih subodinic globinu yakij potim evolyucionuvav shob zibratisya v tetramernu strukturu pislya duplikaciyi 58 Rozvitok a i b geniv stvoriv potencial dlya gemoglobinu skladatisya z kilkoh okremih subodinic fizichnij sklad yakij vazhlivij dlya zdatnosti gemoglobinu transportuvati kisen Nayavnist kilkoh subodinic spriyaye zdatnosti gemoglobinu kooperativno zv yazuvati kisen a takozh regulyuvatisya alosterichno 57 58 Zgodom a gen takozh zaznav duplikaciyi shob utvoriti geni HBA1 i HBA2 59 Ci podalshi duplikaciyi ta divergenciyi stvorili riznomanitnij diapazon geniv a i b podibnih globiniv yaki regulyuyutsya takim chinom sho pevni formi vinikayut na riznih stadiyah rozvitku 57 Vtrata geniv gemoglobinu v bilshosti rib rodini Bilokrivkovi vvazhayetsya adaptaciyeyu do holodnoyi vodi 2 Tipi v lyudej RedaguvatiVariaciya gemoglobinu ye skladovoyu normalnogo embrionalnogo ta plodovogo rozvitku Voni mozhut buti takozh mutantnimi formami gemoglobinu v populyaciyi viklikanami zminami v genetici organizmu Deyaki dobre vidomi varianti gemoglobinu taki yak serpopodibnoklitinna anemiya vidpovidalni za hvorobi yaki vvazhayutsya gemoglobinopatiyami Inshi varianti ne prizvodyat do sposterezhuvanih patologij a tomu vvazhayutsya nepatologichnimi variantami 29 60 U embriona Gower 1 z2e2 Gower 2 a2e2 PDB 1A9W Gemoglobin Portland I z2g2 Gemoglobin Portland II z2b2 U plodu Gemoglobin F a2g2 PDB 1FDH Pislya narodzhennya Gemoglobin A doroslij gemoglobin a2b2 PDB 1BZ0 najposhirenishij iz chastkoyu priblizno 95 Gemoglobin A2 a2d2 sintez d lancyuga pochinayetsya v kinci tretogo trimestru u doroslih normalna chastka stanovit 1 5 3 5 Gemoglobin F plodovij gemoglobin a2g2 U doroslih gemoglobin F limitovanij obmezhenoyu populyaciyeyu eritrocitiv yaki nazivayutsya F klitinami Odnak riven gemoglobinu F mozhe buti pidvishenij u lyudej iz serpopodibnoklitinnoyu anemiyeyu ta b talasemiyeyu nbsp Ekspresiya genu gemoglobinu do ta pislya narodzhennya Takozh identifikuye tipi klitin i organiv u yakih vidbuvayetsya ekspresiya geniv dani z Wood W G 1976 Br Med Bull 32 282 Varianti yaki prizvodyat do hvorob Gemoglobin D Punjab a2bD2 Gemoglobin H b4 variant gemoglobinu utvorenij tetramerom b lancyugiv yakij mozhe buti prisutnim pri deyakih formah a talasemiyi Gemoglobin Barts g4 variant gemoglobinu utvorenij tetramerom g lancyugiv yakij mozhe buti prisutnim pri deyakih formah a talasemiyi Gemoglobin S a2bS2 variant gemoglobinu znajdenij u lyudej iz serpopodibnoklitinnoyu anemiyeyu Mutaciyi v geni b lancyuga prizvodyat do zmin vlastivostej gemoglobinu sho v svoyu chergu prizvodit do zmini formi eritrocitiv na serpopodibnu Gemoglobin C a2bC2 inshij variant sprichinenij mutaciyami genu b lancyuga Vin viklikaye legku hronichnu formu gemolitichnoyi anemiyi Gemoglobin E a2bE2 she odin variant sprichinenij mutaciyami genu b lancyuga Vin viklikaye legku hronichnu formu gemolitichnoyi anemiyi Gemoglobin AS geterozigotnij variant sho viklikaye serpovidnoklitinnu formu eritrocita ale ne sprichinyaye anemiyi Utvorenij cherez te sho odin gen normalnij a inshij viklikaye serpopodibnoklitinnu anemiyu Gemoglobin SC skladnij geterozigotnij variant pri yakomu odin gen normalnij a inshij koduye gemoglobin C Gemolgobin Hopkins 2 variant gemoglobinu yakij inodi rozglyadayut razom iz gemoglobinom S yak prichinu serpovidnoklitinnu anemiyuHvorobi pov yazani z gemoglobinom RedaguvatiGemoglobinova nedostatnist mozhe buti viklikana abo znizhennyam kilkosti molekul gemoglobinu yak pri anemiyi abo cherez znizhennya zdatnosti kozhnoyi molekuli priyednuvati kisen pri odnakovomu kisnevomu parcialnomu tisku Gemoglobinopatiyi genetichni defekti sho prizvodyat do anormalnoyi strukturi molekuli gemoglobinu 61 mozhe viklikati obidvi situaciyi U bud yakomu vipadku gemoglobinova nedostatnist znizhuye zdatnist krovi transportuvati kisen Gemoglobinovu nedostatnist yak pravilo strogo vidriznyayut vid gipoksemiyi yaka viklikana znizhennyam parcialnogo tisku kisnya v krovi 62 63 64 65 hocha obidvi ye prichinami gipoksiyi nedostatnye postachannya tkanin kisnem Inshi poshireni prichini nizkogo rivnya gemoglobinu vklyuchayut vtratu krovi deficit pozhivnih rechovin problemi z kistkovim mozkom himiyeterapiyu nirkova nedostatnist abo anormalnij gemoglobin takij yak pri serpopodibnoklitinnij anemiyi Zdatnist kozhnoyi molekuli gemoglobinu perenositi kisen zazvichaj modifikuyetsya zminenoyu pH krovi abo CO2 sprichinayuchi zminu krivoyi disociaciyi kisnyu i gemoglobinu Odnak vona takozh mozhe buti zminena patologichno yak napriklad pri otruyenni chadnim gazom Znizhennya rivnya gemoglobinu z abo bez absolyutnogo znizhennya rivnya eritrocitiv prizvodit do simptomiv anemiyi V anemiyi ye bagato riznih prichin hocha ferropatiya deficit zaliza i yak rezultat zalizodeficitna anemiya ye najbilsh poshirenimi prichinami v Zahidnomu sviti Oskilki vidsutnist zaliza znizhuye sintez gemiv eritrociti pri zalizodeficitnij anemiyi ye gipohromnimi bez chervonogo pigmentu gemoglobinu i mikrocitarni menshi nizh normalni Inshi vidi anemiyi ye ridkisnimi Pri gemolizi prishvidshene rozpadi eritrocitiv zhovtyanicya sprichinyayetsya metabolitom gemoglobinu bilirubinom i cirkulyuyuchij gemoglobin mozhe sprichiniti nirkovu nedostatnist Deyaki mutaciyi v globinovomu lancyugu pov yazani z gemoglobinopatiyami takimi yak serpopodibnoklitinna anemiya i talasemiya Inshi mutaciyi vkazani na pochatku statti ye dobroyakisnimi i rozglyadayutsya lishe yak varianti gemoglobinu Isnuye grupa genetichnih rozladiv vidomih yak porfiriyi yaki harakterizuyutsya pomilkami v metabolichnih shlyahah sintezu gemiv Korol Georg III buv mabut najvidomishim hvorim na porfiriyu U nevelikih kilkostyah gemoglobin A povilno priyednuye glyukozu do kincya valinu alfa aminokislota u kozhnomu b lancyuzi Otrimanu molekulu chasto nazivayut Hb A1c glikovanij gemoglobin Priyednannya glyukozi do aminokislot u gemoglobini vidbuvayetsya spontanno bez dopomogi fermentiv i yak vidomo ne sluguye dlya korisnih cilej Odnak zi zbilshennyam zrostannya koncentraciyi glyukozi v krovi vidsotok gemoglobinu A yakij peretvoryuyetsya na gemoglobin A1c zrostaye U diabetikiv u yakih riven glyukozi zazvichaj visokij vidsotok gemoglobinu A1c takozh visokij Cherez te sho priyednannya glyukozi v gemoglobini A vidbuvayetsya duzhe povilno vidsotok gemoglobinu A1c pokazuye serednye znachennya rivnya glyukozi v krovi protyagom chasu zhittya eritrocitiv sho stanovit 120 dib 66 Takim chinom riven glikovanogo gemoglobinu vimiryuyut dlya monitoringu hronichnogo zahvoryuvannya cukrovogo diabetu 2 tipu Poganij kontrol diabetu 2 tipu prizvodit do visokogo rivnya glikovanogo gemoglobinu v eritrocitah Diapazon normalnih znachen stanovit priblizno 4 0 5 9 Hocha yih vazhko otrimati znachennya menshe 7 rekomendovani dlya lyudej iz diabetom 2 tipu Rivni ponad 9 pov yazani z poganim kontrolem glikovanogo gemoglobinu a rivni ponad 12 pov yazani z duzhe poganim kontrolem Diabetiki yaki pidtrimuyut riven glikovanogo gemoglobinu na rivni blizko 7 mayut nabagato bilshe shansiv uniknuti uskladnen yaki mozhut suprovodzhuvati cukrovij diabet nizh ti u yakih riven 8 abo vishe 67 Krim togo pidvishenij glikovanij gemoglobin zbilshuye jogo sporidnenist iz kisnem takim chinom zapobigayuchi jogo vivilnennyu v tkaninah i v krajnih vipadkah viklikayuchi gipoksiyu 68 Pidvishenij riven gemoglobinu pov yazanij zi zbilshennyam kilkosti abo rozmiriv eritrocitiv policitemiya Pidvishennya mozhe buti sprichinene vrodzhenoyu hvoroboyu sercya legenevim sercem pnevmosklerozom zavisokim rivnem eritropoetinu abo spravzhnoyu policitemiyeyu 69 Visokij riven gemoglobinu takozh mozhe buti viklikanij perebuvannyam na velikij visoti kurinnyam znevodnennyam shtuchno pidvishuyuchi koncentraciyu gemoglobinu progresuyuchimi zahvoryuvannyami legeniv ta deyakimi puhlinami 48 Neshodavnye doslidzhennya provedene v Puducherri Indiya pokazuye znachennya gemoglobinu pri ishemichnij hvorobi sercya 70 Div takozh Redaguvati nbsp 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