Hypersenstivity Type I- Hunter Flashcards
What are some secondary immune deficiencies?
malnutrition and immunosuppressant drugs.
When the immune system damages itself what do we call this?
immunopathology due to hypersensitivity responses
T or F
A little immunopathlogy is normal in all infection
T
What is an allergy?
your immune system responding to innocuous stimuli.
WHen self nonself identification is all messed up, what do you have?
immunopathology
What is Type I hypersensitivity?
this is an allergy like asthma and allergic rhinitis.
What is type I hypersensitivity mediated by?
IgE
What are the 2 main cell types in Type I hypersensitivty?
Mast cells and eosinophils
What are type II hypersensitivity disorders?
most are autoimmune (some type II hypersensitivity reactsion are caused by extrinsic things but mostly this category is autoimmune)
How does type II hypersensitivity reaction work?
triggers IgG antibodies to bind to our own tissues and turn our immune system against ourselves (blood, tissue, ECM)
What is type III hypersensitivity?
it is caused by an IgG antibody that has formed immune complexes. These antigen antibody complexes form in almost every infection but when they cannot be cleared, cause immune complex disease
How is type IV hypersensitivity caused?
by CD4 and CD8 T cells (some are autoimmune and some are extrinsic)
Why kind of hypersensitivity is found in rheumatoid arthritis?
Type II, III, IV
In type 1 immediate hypersensitivity, what is the immune reactant, is the antigen soluble or insolube, what is the effector mechanism and what are some examples?
IgE
soluble antigen
mast-cell activation
allergic rhinitis, asthma, systemic anaphylaxis
What do you find within mast cell granules?
mediators
One of the prinicipal immune defense mechanisms against metazoan parasites (worms) is (Blank) killing by eosinophils
IgE
IgE can bind to worms and release the granules inside them to kill them
How does our body expulse parasites?
cross-linking of anti-parasite IgE on mast cells by parasite antigen causes the release of mediators that promote expulsion of parasites
What sucks about the IgE response that was created to bind and expulse parasites and worms?
it can be elicited by inocuous environmental materials (allergens)
What is a classic way to shift THO to produce TH2
WORMS!!!!!
What does histamine do in the gut?
causes rapid contraction, vomiting, and diarrea
(blank) is an antigen that induces allergy
allergen
Type I hypersensitivity reactions are induced by extrinisc allergens. What are some of these?
pollen, house dust mite, wasp, drugs, peanuts, shellfish
(pant pollens, dander, mold spores, feces, insect venoms, vaccines, drugs, therapeutic proteins, food, orally admin drugs)
How does an allergen cause IgE production?
dendritic cells and other immune cells in mucosa produce IL-4, IL-5, IL-9, IL-13 in response to antigen-> and these favor TH2 differentiation.
What will IFN gamma and IL12 stimulate?
TH1 cell