Immunity to microbes (Huckriede)

15 important questions on Immunity to microbes (Huckriede)

What is the pathogenic mechanism of extracellular bacteria?

- Production of toxins -> Endotoxns (LPS), exotoxins (cell killing etc.)
- Induction of inflammation

What are the receptors sensing bacterial infections? (Signalling and endocytotic receptors?

Signalling receptors: TLR, NLR, Cytosolic DNA sensors

Endocytic receptors: C-type lectin-like receptors, scavenger receptors, N-formyl met-leu-phe receptors

What mechanisms drive the innate immunity to extracellular bacteria?

Complement activation, Phagocytosis, Inflammation

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What are the important inflammatory cytokines produced by macrophages, mast cells and endothelial/epithelial cells?

TNF, IL-1 and IL-6

What accumulates during local inflammation?

Edema -> dilution of bacterial products, plasma proteins (complement etc)

Complement activation -> Effector cells

By what is the alternative pathway and lectin pathway activated?

Alternative pathway -> Bacterial cell wall components (gram+: peptidoglycans, gram-: LPS)

Lectin pathway: Mannose-binding lectin

The complement system. What does C3a, C3b, and C5a induce?

C3a: Inflammation
C3b: Opsonization and phagocytosis
C5a: Inflammation

What does the C-reactive protein test screen for?

Hallmark of inflammation, distinguishes bacterial from viral infections.

What is the adaptive response to extracellular bacteria?

- induction of antibodies
- activation of CD4+ helpter T cells

What does an CD4+ helper T cell produce to activate macrophages?

IFN-gamma

How do super antigens cause a cytokine storm?

By polyclonal activation of T cells

What is the pathogenic mechanism of intracellular bacteria?

- host immune response (granulomas, cytokines)
- induction of epigenetic changes leading to gene silencing or activation

Which receptors sense infections by intracellular bacteria?

TLR's, NLRs, cytosolic DNA sensors

Which cells are involved in innate immunity to intracellular bacteria?

- NK cells
- Phagocytes
- Type I ILCs

What is the adaptive response to intracellular bacteria?

Cell-mediated immune response, CD4+ T cells and CD8+ T cells (CTLs)

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