Handout Autoimmune Flashcards
Immediate (Type I) Hypersensitivity
Rapid immunological reaction within minutes after the combination of an antigen with antibody bound to mast cell in individuals previously sensitized to the antigen
What is anaphylaxis
System form of typic I hypersensitivity characterized by shock, edema, and respiratory compromise (due to upper airway edema)
Type II hypersensitivity
antibody-mediated; immunological reaction caused by antibodies against cell surface or extracellular matrix antigens
Type III hypersensitivity
immune complex-mediated; damaging inflammatory reaction to antigen-antibody complexes, especially in blood vessels or glomeruli
Type IV hypersensitivity
cell-mediated; immunological reaction caused by sensitized CD4+ T-lymphocytes, sometimes producing aggregates of activated macrophages working together (granulomas)
RA antibody
Anti-cyclic citrullinated peptide (anti-CCP)
CREST syndrome (limited systemic sclerosis) antibody
Anti-centromere
Polymyositis/dermatomyositis antibody
Anti-Jo-1 (one type of anti-synthetase)
Systemic sclerosis antibody
Diffuse –> Anti-Scl70 (= anti-DNA topoisomerase)
Anti-RNA polymerase (anti-U3 RNP)
Mixed CT disease antibody
Anti-U1 RNP
Lupus antibody
Anti-Smith (anti-Sm)*
Anti-dsDNA
Anti-nuclear (ANA)
Sjogren Syndrome, neonatal lupus, subcutaneous lupus antibody
Anti-SSA (=anti-Ro)
Anti-SSB (=anti-La)
Microscopic polyangiitis, eosinophilic granulomatosis with polyangiitis (Churg Strauss) antibody
Anti-myeloperoxidase (= perinuclear anti-neutrophil cytoplasmic, P-ANCA)
Granulomatosis with polyangiitis (Wegner’s) antibody
Anti-proteinase-3 (= diffuse cytoplasmic anti-neutrophill cytoplasmic, C-ANCA)
Does finding serum antibodies confirm diagnosis of rheumatological diseases?
NO! Many people with no apparent rheumatological disease have antibodies associated with rheumatological disease, and should not be falsely diagnosed on the basis of serology alone
SLE Definition
prototype multisystem autoimmune disease
SLE Epidemiology
fairly common, up to 13X more common in women, more common in blacks, affects 1 in 245 black women, most common in child-bearing age (15-45), more severe in blacks and Asians
SLE Pathogenesis
failure of self-tolerance, antinuclear antibodies, genetic factors, environmental factors (medications, UV light, sex hormones), immunologic factors (activation of helper T cells and B cells, IgG autoantibody production, immune complexes)
SLE Gross Pathology
non-erosive synovitis in 90%, pleuritis in 46%, pericarditis in 25%, peritonitis (commonly polyserositis), Libman-Sacks endocarditis (1-3mm verrucous vegetations on either side of valve), moderate splenomegaly
SLE Microscopic Pathology
acute necrotizing vasculitis of small arteries in arterioles (with fibrinoid deposits), nephritis in 50%, cerebritis in 50%
What are the 5 patterns of glomerulonephritis in SLE
Minimal Mesangial Focal proliferative Diffuse proliferative Membranous
What is the characteristic histology of glomerulonephritis in SLE
glomerular granular deposits of IgG and complement, subendothelial dense deposits causing wire loop lesions, most common in diffuse proliferative and indicative of active disease
SLE Symptoms
Commonly relapsing and remitting
Joint pain (without deformity) in 90%
Fever (sometimes all alone “fever of unknown origin”) in 83%
Fatigue in 81%
Weight loss in 63%
Pleuritic chest pain, photosensitivity, nephrotic syndrome (edema), angina, alopecia (hair loss), myalgias