Inhibicijski faktor migracije makrofaga
Inhibitorni faktor migracije makrofaga (MIF) | |
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Identifikatori | |
Simbol | MIF |
Inhibitorni faktor migracije makrofaga (MIF), znan i kao inhibitorni faktor glikozilacije (GIF), L-dopahrom-izomeraza ili fenilpiruvat-tautomeraza jest protein/enzim koji je kod ljudi kodiran genom MIF sa hromosoma 22.[5][6] MIF je važan regulator urođene imunosti.[7] Natporodica proteina MIF također uključuje drugog člana s funkcionalno srodnim svojstvima, D-dopahrom-tautomerazu (D-DT).[8]Površinski receptor za MIF je CD74.[9]
Bakterijski antigeni stimuliraju bijela krvna zrnca da otpuste MIF u krvotok.[10] Cirkulirajući MIF se vezuje za CD74 na drugim imunskim ćelijama, kako bi pokrenuo akutni imunski odgovor. Stoga je MIF klasifikovan kao upalni citokin. Štaviše, glukokortikoidi također stimulišu bijela krvna zrnca da oslobađaju MIF i stoga on delimično suprotstavlja inhibitorne efekte koje glukokortikoidi imaju na imunski sistem. Konačno trauma aktivira prednji režanj hipofize da oslobodi MIF.[11]
Aminokiselinska sekvenca
[uredi | uredi izvor]Dužina polipeptidnog lanca je 115 aminokiseline, a molekulska težina 12 476 Da.[11]
10 | 20 | 30 | 40 | 50 | ||||
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MPMFIVNTNV | PRASVPDGFL | SELTQQLAQA | TGKPPQYIAV | HVVPDQLMAF | ||||
GGSSEPCALC | SLHSIGKIGG | AQNRSYSKLL | CGLLAERLRI | SPDRVYINYY | ||||
DMNAANVGWN | NSTFA |
Struktura
[uredi | uredi izvor]Inhibicijski faktor migracije makrofaga sastavlja se u trimer od tri identične podjedinice. Svaki od ovih monomera sadrži dva antiparalelna alfa heliksa i četvorolančani beta-list. Monomere okružuju centralni kanal sa trostrukom rotacijskom simetrijom.[12][13]
Odgovor na povredu
[uredi | uredi izvor]Citokini imaju važnu ulogu u podsticanju zacjeljivanja rana i obnavljanja tkiva. Povreda ćelije dovodi do oslobađanja MIF-a koji zatim stupa u interakciju sa CD74. MIF-CD74 signalizacija aktivira proopstanak i proliferativne puteve koji štite domaćina tokom ozljede.[14]
Enzimska aktivnost
[uredi | uredi izvor]MIF sadrži dva motiva sa katalitskom aktivnošću. Prvi je motiv od 27 aminokiselina koji se nalazi na N-terminalu funkcioniše kao fenilpiruvat-tautomeraza koja može katalizirati konverziju 2-karboksi-2,3-dihidroindol-5,6-kinona (dopahrom) u 5,6-dihidroksiindol-2-karboksilnu kiselinu (DHICA).[15][16] MIF također sadrži Cys-Ala-Leu-Cys katalitsko mjesto između ostataka 57 i 60 koje funkcionira kao disulfid- reduktaza.[17]
Funkcija
[uredi | uredi izvor]Ovaj gen kodira limfokin uključen u ćelijski posredovanu imunost, imunoregulaciju i upale.[18][19][20] MIF ima ulogu u regulaciji funkcije makrofaga u odbrani domaćina kroz supresiju protivupalnih efekata glukokortikoida.[20][21][22] Ovaj limfokin i JAB1 protein formiraju kompleks u citosolu blizu periferne plazmamembrane, što može ukazivati na ulogu u integrinskim signalnim putevima.[23]
Mehanizam djelovanja
[uredi | uredi izvor]MIF se vezuje za CD74,[24] izazivajući njegove fosforilacije i regrutacije CD44 koji zatim aktivira nereceptorske tirozin kinaze, što u konačnici dovodi do fosforilacije kinaza reguliranih vanćelijskim signalom.[25] Osim ERK-a, stimulacija CD74 aktivira i druge signalne puteve kao što su PI3K-Akt, NF-κB i AMP-aktivirani putevi protein kinaze (AMPK).[26]
Interakcije
[uredi | uredi izvor]Zabilježeno je da inhibitorni faktor migracije makrofaga ima interakcije sa:
Klinički značaj
[uredi | uredi izvor]MIF je potencijalni cilj lijeka za sepsu, reumatoidni artritis i rak.[40][41]
Parazitno-proitvedeni homolozi MIF-a
[uredi | uredi izvor]Višestruki protozojski paraziti proizvode homologe MIF-a koji imaju slične upalne funkcije kao i ljudski MIF i imaju ulogu u njihovoj patogenezi, invaziji i imunskoj evaziji.[42][43] Pretklinička studija je pokazala da blokiranje parazitskog MIF poboljšava ishod kod teških infekcija protozoaama.[44] Prijavljeni primjeri protozoa sa homolozima MIF-a:
- Entamoeba histolytica,[45]
- Plasmodium falciparum,[46]
- Toxoplasma gondii,[47]
- Leishmania,[48]
- Trichomonas vaginalis.[49]
Reference
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