test 4 Flashcards
(29 cards)
temporal arteritis
inflammation and damage to the blood vessels that supply blood to the head; unknown cause;
feel a string like a pencil
giant cell arteritis.
temporal-if the inflammation affects the arteries in your neck, upper body and arms, it is called
immune system related diseases
autoimmune disease hypersensitivity disorders (allrgis) immunodeficencies neoplasia (leukemias, lyphomoas, others)
autoimmune disease
caused y erroneous attack of the immune system on SELF tissues
dont know most pathogenesis
exs of autoimmune disease
rheumatoid arthritis multiple sclerosis type 1 diabetes graves disease mayasthenia gravis
Autoimmunity
Immune responses directed against self antigens (self tissues). Does not necessarily lead to tissue damage
Autoimmune disease
An inappropriate response of the immune system against self antigens which results in tissue damage
B cells can produce
autantiobodies
T cells can produce
autoantigens
mechanisms to control autoimmunity 1
most autoantibodies are IgM with low affinity and are present in low concentrations. IgM antibodies remain intravascular
mechanisms to control autoimmunity 2
autoantigens are often sequestered
mechanisms to control autoimmunity 3
autoreactive t cells are deleted in thymus (neg selection) or in periphery (lack of costimulation, periphereal toleracne)
mechanisms to control autoimmunity 4
autoreactive b cells are deleted in bone marrow
mechanisms to control autoimmunity 5
autoreactive t cells need to be activated before they can do damage; they need to see their target in antigen presenting cells and need to get the right signasl to become harmless
mechanisms to control autoimmunity 6
regulatory cells may control autorective cells
Molecular mimicry
Sequence homology between microbial and self proteins. Immune system responds to microbes and cross-reactive autoimmunity to self-antigens develops.example: RHEUMATIC FEVER
Failure of regulatory mechanisms:
failure of tolerance, lack of regulatory T cells, cytokine imbalances
how do autoimmune diseases arise?
M.F.P.A.
t cells mature and educated in
thymus
genes and autoimmune disease
HLA(MHC) is the strongest link
organ specific autoimmune disease
targets a specific organ
antibody mediated organ specific autoimmune disease
cell-mediated organ specific autoimmune diseases
antibody mediated organ specific autoimmune diseases
Grave’s diease
Myasthenia gravis
Goodpasture’s syndrome
cell mediated organ specific autoimmune disease
multiple sclerosis
type 1 disease
systemic autoimmune disease
systemic lupus erthematosus
rheumatoid arthritis