Lecture # 12 MHC Restriction Recap Antigen Processing and Presentation - Class I Flashcards Preview

Medical Immunology Bios 443/843 > Lecture # 12 MHC Restriction Recap Antigen Processing and Presentation - Class I > Flashcards

Flashcards in Lecture # 12 MHC Restriction Recap Antigen Processing and Presentation - Class I Deck (23):
1

MHC and applications to transplantation

Slight differences in MHC from donor to acceptor causes allergy.

2

Super antigens

Bind to the outside of the MHC/TCR VB3 NOT VIA MHC1; Polyclonal activation of VB3+ T Cells; cytokine storm (cause toxic shock syndrome) and deletion of T Cells; recognize by T cells without being processed into peptide;

3

JITT #5 Q# 1; From the class I deficiency study, Tatiana and Alexander had normal delayed type hypersensitivity response to tuberculin and candida (fungal organism) Why do you think this is?

1) Candida and Tuberculin are fungal and bacterial respectively, both are extracellular pathogens
2) We know that MHC I is deficient, MHC II must be at work
3) MHC II specifically works against extracellular pathogens

4

MHC I combats which type of pathogen?

Viral

5

MHC II combats which type of pathogen?

extracellular

6

Why is deficiency such a big deal when we are considering CD8+ and CD4+?

Because if we are deficient in an MHC, then there is no CD8+ or CD4+ development!!! Low levels of T Cells!!

7

What type of peptides do CD4 T cells recognize?

CD4+ cells recognize bacterial peptides in the context of MHC II

8

Antigen processing

refers to the generation of peptides from an intact antigen that involves modification of naive protein

9

Antigen presentation

refers to the display of the peptide at the cell surface by MHC molecules to T cells

10

In what region do peptides recognized by CD8+ T Cells originate from?

Pathogen peptides are from the cytosolic compartment

11

In what region do peptides recognized by CD4+ T Cells originate from?

Pathogen peptides are from the endosomal/vesicular compartment

12

Cross Presentation pathway (Class I )

Exogenous antigens from a dying virus infected cell that is phagocytosed by a DC can be transported to the cytosol

13

Class II pathway

BCR mediated endocytosis, peptides are presented; MHC II expression and CD4+ effectors

14

What types of peptides can APC express?

Professional APCs present pathogens to both CD4+ and CD8+

15

Which type of MHC presentation is TAP specific for?

MHC class I presentation

16

How do peptides from the cytosol get into the ER to be loaded to MHC Class I molecules?

By TAP

17

Proteosome

large protease complex that degrades cytosolic proteins

18

What are the two types of proteosomes?

Constitutive proteosome and immunoporteosome

19

Constitutive proteosome

alpha and beta subunits induced to become the immunoproteosome by interferon gamma

20

Immunoproteosome

LMP2, MECL-1, LMP7 subunits

21

PA28

compound that binds to ends of inducible proteosome, opens up the ends and increases the rate at which peptides are releases. induced by interferon gamma

22

ERAP

chops peptides more to produce a peptide that better fits to MHC go to slide 22right now

23

Viral Evasins

degrade class I or bind to TAP and inhibit peptide loading

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