The Immune Response Flashcards

1
Q

Following pathogen enrty, what does tissue resident cells bind to?

A

Pathogens

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2
Q

What happens after tissue resident cells bind to pathogens?

A

Cell signalling and the release of proinflammatory mediatord and chemokines

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3
Q

How do tissue resident macrophage recognise a pathogen?

A

Pattern recognition receptors (PRR) and macrophages bind to pathogen associated molecular patterns (PAMPs) on pathogens

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4
Q

Where are pattern recognition receptors found?

A

On other innate immune cells

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5
Q

What are the different cellular compartments are pattern recognition receptors found?

A

Cell surface for extracellular pathogens
Cytoplasmic for pathogens that have entered cells
Endosomal vesicles following cell entry

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6
Q

What is the result of the binding pathogens to pattern recognition receptors?

A

Signalling and immune cell activation

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7
Q

What does the binding of Toll-like receptors result in?

A

Gene transcription and the release of pro-inflammatory signalling molecules

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8
Q

What is the earliest stage of inflammation?

A

Recognition of a pthogen by macrophages and dentric cells in tissues

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9
Q

What gets afftected when soluble signalling molecules are released?

A

Local blood vessels

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10
Q

What happend to the blood vessels when inflammation occurs?

A

The blood vessels dialate and express adhesion molecules which bind cells in the blood

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11
Q

When tissue resident macrophages and dentric cells express new molecules, what is the role of the new molecules?

A

To start the adaptive response

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12
Q

What is the result of cytokines released by tissue resident macrophage?

A

Changes to blood flow and permeability of vessel

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13
Q

What increases movement of plasms proteins and leucocytes out of circulation?

A

Cytokines released by tissue resident macrophage

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14
Q

What causes leucocyte influx into tissues?

A

Changes in blood flow and vascular permeability

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15
Q

What are phagocytic cells?

A

Neutrophils and macrophages

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16
Q

Movement into tissue cells is a multistep process helped by what?

A

cytokines, chemokines and adhesion molecules

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17
Q

What are the two major families of adhesion molecules?

A

Integrins and selectins

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18
Q

Where to leucocytes move once they have ‘stopped’?

A

Through the vessel wall through postcapillary venules

19
Q

What stimulates when chemokines act on the adhered leucocytes?

A

Their migration

20
Q

What and where do extravasated leucocytes follow?

A

Chemokine gradients to the site of infection

21
Q

What are endogenous?

A

Chemokines, complement fragments

22
Q

What are exogenous?

A

Bacterial products

23
Q

What happens in the first 6-24hrs of inflammation?

A

Accute inflammation, neutrophils predominate

24
Q

What replaces neutrophils after 24-48hrs?

25
Why are neutrophils first?
They are most abundant leucocyte in blood Rapidly respond to chemokines Bind to adhesion molecules more tightly
26
What is the lifespan of neutrophils?
24-48hrs
27
Do monocytes live longer then neutrophiles?
Yes
28
Do monocytes divide and dominate in prolonged inflammation?
Yes
29
Why do we recriut cells to the dite of infection?
Pathogens at the dite of infection are recognised by phagotic cells recruited from the circulation The recognition induces phagocytosis and intracellular killing PRR's on phagocytes bind to pathogen associated molecule patterns on bacteria
30
What does phagocytosi require?
Recognition and binding Engulfment Killing
31
What are the three steps of adaptive immunity?
1. Specialised peripheral lymphoid tissues concentrate antigens from portals of entry 2. Naive lymphocytes migrating through peripheral lymphoid tissues recognise antigens and intitate the adaptive response 3. Effector and memory lymphocytes circulating in the blood and home to peripheral sites
32
What is the funtion of lymphocytes?
Can specifically recognise and ditinguish different antigenic determinants?
33
What do lymphocytes consist of?
Distinctive subsets with different functions although they look the same
34
What do B-lymphocytes produce?
Antibodies
35
What to T-lymphocytes produce?
CD8+ or CD4+
36
Do B and T cells have antigen receptors?
Yes BCR and TCR
37
What are B and T cell antigen receptors generated by?
DNA recombination
38
How are lymphocytes developed?
After birth, all blood cells, including lymphocytes are generated from stem cells in the bone marrow
39
What happens when naive lymphocytes enter secondary lymphoid tissues and encounter entigen?
They become activated
40
Is there a large or small population of naive lymphocyted that recognise a specific antigen?
A small population
41
What does it mean for a naive lymphocytes to recognise a specific antigen?
Clonal selection
42
what does activation of naive lymphocytes result in?
The proliferation and differentiation into armed effecot and memory cells
43
Where do armed effectors migrate to?
The site of infection