10) MHC Flashcards

1
Q

3 main Ag recognition molecules in the immune system

A
  • TCR
  • sIg
  • MHC
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2
Q

2 main functions of MHC in T-cell response

A
  • establish library of T-cells during development
  • activation of mature T cells
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3
Q

2 best known MHC molecules

A
  • human (HLA)
  • mouse (H2)
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4
Q

MHC similar to Ig

A

MHC I

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5
Q

divided into 3 independent loci (A, B, C)

A

MHC I

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6
Q

3 variable portions of MHC I

A

𝛼1
𝛼2
𝛼3

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7
Q

invariant portion of MHC I

A

β2 microglobulin

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8
Q

MHC I AA length

A

8-9

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9
Q

binds to β2 microglobulin of MHC I

A

CD8

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10
Q

each individual expresses —- MHC I molecules

A

6

(2 HLA-A, 2 HLA-B, and 2 HLA-C)

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11
Q

subdivided into DP and DR

A

coding region for MHC II

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12
Q

consists of parallel transmembrane 𝛼 and β chains

A

MHC II

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13
Q

MHC II AA length

A

12-25

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14
Q

binds to invariant β region of MHC II

A

CD4

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15
Q

MHC II always expressed on…

A

B cells
dendritics
thymic epithelials

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16
Q

can be induced to express MHC II

A

T-cells
macros

17
Q

group of complement factors found in serum

18
Q

what kind of Ag does MHC II present?

A

exogenous
internalized by endocytosis or phagocytosis

19
Q

what kind of Ag does MHC I present?

A

endogenous
synthesized within the cell

20
Q

MHC — presents antigens found in vaccines with a non-infectious viral particle

21
Q

parameters to consider when trying to elicit an immune response

A
  • amount of Ag
  • timing of exposure
  • route of entry
22
Q

immunogenicity depends on…

A
  • complexity of Ag/more epitopes
  • foreign
  • large enough
23
Q

added to enhance immunogenicity of vaxx

24
Q

time before Ab is detectable in serum

A

latent phase
(1-2 weeks)

25
production and degradation of Ab reach equilibrium
steady state
26
anamnestic response
secondary response
27
differences in secondary phase
- lag phase shorter - Ab production greater - Ab production continues for longer - more IgG than IgM
28
cell cooperation
Ab production requires cooperation between 2 lymph types (irradiated mouse experiment)
29
irradiated mice with/without immune response
WITH: - given spleen cells - given BM + thymus cells WITHOUT: - given BM cells - given thymus
30
main 2 roles of accessory cells (macros) in inducing immune response
- trap and concentrate Ag - process and present Ag
31
NOT activated by free Ag
T -cells
32
process of Ag processing
- protein Ag enters cell (endo or phagocytosis) - vacuoles merge with lysosomes, which have degradative enzymes - peptides cut to 8-20 AAs - **immunodominant** peptides lead to T-cell activation
33
T-cell receptor complex that requires CD4 to stabilize affinity
TCR-CD3
34
2 requirements for activation of T-cells
- engagement of receptors - second signal (IL-1)
35
main cytokine serving as a second signal for T-cell activation
IL-1
36
happens first as T-cells are activated
- membrane phospholipids break down - phosphorylation of intracellular proteins - lymphokines secreted
37
cytokines involved in B-cell differentiation to active plasma cells
IL-4 IL-5
38
T-independent antigens
Ag capable of activating B-cells to product Ab in the absence of T helpers
39
properties of T-independent Ag
- large, polymeric - multiple, repeating antigenic determinants - generate primarily IgM - do NOT give rise to memory - macros seem to be required