Lecture 47: Immune Responses to Microbes Flashcards Preview

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Flashcards in Lecture 47: Immune Responses to Microbes Deck (12)

Describe the pathways of humoral immunity for protection against extracellular bacterial pathogens:



Pasteur showed that chickens....
Erlich demonstrated that immune serum (antibody) was....
Metchnikoff identified that some forms of immunity required....

- Developed immunity to cholera
- Protective
- Cells, not serum or antibody


CD4 T Helper Cells make...

- B cells (plasma cells)
- MΓΈ cells
- CTL cells


The real signal that starts the immune response come from the...

- APC (antigen presenting cells)


Antibody mediated protection: We always start by secreting Ig_ molecules. It's very important because....However it has a very short half life. So Ig_ becomes the next dominating molecule, they last a very long time. IgA is able to look a little bit like Ig_ in it's monomeric form.

- IgM = pretty good at killing
- It has 10 surfaces that can recognise antigens
- IgG = all rounder for a very long time
- IgG
- Dimeric IgA is protected from mucosal degradation


Antibody mediated mechanisms for antigen removal:

Binding of antibodies to antigens inactivates antigens by (3) (1)... (3) = ? (1) = ?

- Viral Neutralization
- Agglutination of antigen bearing particles
- Precipitation of soluble antigens
- Phagocytosis
- Activation of complement system and pore formation
- Cell Lysis


Complement mediated lysis of Gram (-) bacteria:

- Complement attached to bacterial cell, creates pore
- Cell swells up because GRADIENTS + H2O + Sodium


IgE protects against...

- Parasites
- Is a highly invasoactive molecule which changes mucous secretion but can act directly against parasites, does this in 2 ways
- Mast cells + eosinophils have IgE receptors
- When we produce IgE, they combine to these, in the tissues, these cells interact with parasites, firstly the histamine causes vasodilation, massive flow of fluids into the tissues, parasite is just spat out, if it's in the body of the tissues, eosinophil makes mbp + ecp these are cytotoxic to parasites


Control of Tb requires adaptive (T Cell) Immunity:

- After initial infection, adaptive immunity takes place


Cells involved with the Cell Mediated Immunity to Acute Intracellular (Virus) Infection:

- APC --> CD4 + CD8 ----> CTL ---> Virus-infected cell --> Apoptosis


In the Cytotoxic T Cell we have....

- Perforin and Granzymes
- Granzymes activate apoptotic enzymes


There are __ different defence pathways.

- 4

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