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Samenvatting immunologie deel 3 (vervolg H6)

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Vervolg op vorige samenvattingen: immunologie H1-4 en H6

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HOOFDSTUK 7 – ANTIGEEN PRESENTATIE, HLA EN TRANSPLANTATIE

HET MHC SYSTEEM

ADAPTIEVE IMMUNITEIT TEGEN PATHOGENEN


INTRACELLULAIRE PATHOGENEN

Geïnfecteerde cel (target cel)
- presenteert intracellulair antigen aan oppervlakte in MHC-1
- indien het een niet-eigen antigen is:
→ target cel wort afgedood door CD8+ T cel (CTL)




EXTRACELLULAIRE PATHOGENEN

1) Antigen-presenterende cel (APC) fagocyteert pathogeen
→ antigenen van die pathogeen worden gepresenteerd aan CD4+ T helper cel

2) CD4+ T helper cel wordt geactiveerd en interageert met B cel
→ B cel wort geactiveerd om antistoffen te maken

3) Antistoffen neutraliseren de pathogeen




ANTIGEN PRESENTATIE

, MHC = MAJOR HISTOCOMPATIBILITY COMPLEX

MHC-I MHC-II

STRUCTUUR alfa-keten met TM domein 1 alfa-keten
→ vormt volledige antigen-bindende 1 beta-keten
groeve → beide met TM-domein, vormen samen
→ 1 alfa keten met alfa1, 2 & 3 domein antigen-bindende groeve

beta2-microglobuline nodig voor structuur

INTRACELLULAIRE - door het proteasoom - in het fagolysosoom
PROCESSING V/H - transport via TAP-complex naar het ER
ANTIGEN

GEPRESENTEERDE 8-10 AZ lang 13-18 AZ lang
PEPTIDEN (uiteinden van MHC-I groeve gesloten) (uiteinden van MHC-II groeve meer open)
→ peptides steken eruit, langer




TAP = transporter associates with antigen processing

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