Forelæsning 14 Flashcards

1
Q

Hvornår virker AID?

A

Under transskription af mRNA når DNA er enkeltstrenget (i centroblaster)

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2
Q

Hvilken transskriptionsfaktor laver de B-celler som vinder affinitetskampen?

A

Bcl-XL

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3
Q

Forskel på centrocytter og centroblaster:

A

Centrocytter expresser Ig mens centroblaster ikke gør.

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4
Q

Hvor sker class switching?

A

Light zones.

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5
Q

Hvad afgør hvilken isotype det skal være?

A

Tfh udskilte cytokiner.

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6
Q

Hvordan påvirker cytokiner isotypen?

A

Cytokinerne åner forskellige stykker på DNA-et - gør dem single stranded.

Gør så aid kan gå ind i disse specielle sekvenser (switch regions) og lave mutationer hvilket forårsager at en bestemt type skæres ud.

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7
Q

Hvad udvikler centrocytter sig til?

A

Plasmaceller eller huskeceller - påvirkes af Tfh cytokiner - IL4 = huske, IL-10 = plasma.

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8
Q

Vigtige antistof funktioner:

A

1) neutralisere toxiner (IgG og IgA)

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9
Q

Hvilke komplement fikserer IgM?

A

C1q. - C4b - C3b - mac-attack

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10
Q

Positive sider ved en lang hængsler:

A

Flexibilitet og versatilitet - kort levetid.

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11
Q

IgM summary:

A

hurtig 1st response - aktiverer komplement - blod, lymfer, mucosa

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12
Q

IgD summary:

A

Sensitizes basophiles, airways

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13
Q

IgG summary:

A

All around - blood, tissue, placenta

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14
Q

IgE summary:

A

Sensitizes granulocytes - mucosae surfaces

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15
Q

IgA summary:

A

Neutralizes - dimer = mucosae + secretions, monomer = blood, tissues.

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