Autoimmunity

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50 Terms

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Autoimmunity

conditions in which damage to organs/tissue results from the presence of autoantibody/autoreactive cells

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SLE manifestations

arthritis

erythematous skin rash

nephritis

neuropsychiatric

hematologic abnormalities

cardiac abnormalities

fatigue, weight loss, malaise, fever, anorexia

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SLE lab features

presence of ANAs, circulating immune complexes, decreased complement (C3 & C4) levels, cyoglobulins, circulating anticoag & nonspecific elevation of IgG levels

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Fluorescent ANA (Indirect immunoflrescence)

- most widely used and accepted because of high sensitive

- screening is done: 1:40 or 1:80 dilution of px serum

- titer of > or equal 160 is generally considered to be clinically significant

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Homogenous/diffuse

uniform staining of the entire nucleus

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Peripheral/Rim

greater staining intensity surrounding the nucleus

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Speckled

discrete, fluorescent specks throughout the nuclei

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Nucleolar

prominent staining of the nucleoli

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Centromere

numerous discrete speckles (46 speckles) are seen in the nuclei

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Anti-dsDNA

Staining pattern: homogenous/diffuse, peripheral/rim

Significance: active stage of SLE

Gold standard: IFA staining of Crithidia luciliae

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Anti-DNP (deoxynucleoprotein)

Staining pattern: homogenous/diffuse, peripheral/rim

Significance: appearance of LE cells, found in 90% untreated SLE

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Anti-Smith/Anti-Sm

Staining pattern: coarsely speckled

Significance: diagnostic of SLE

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Anti-RNP

Staining pattern: coarsely speckled

Significance: SLE, RA, Sjorgen's syndrome, mixed connective tissue disease

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Anti-histones (nuclear proteins)

Staining pattern: homogenous/diffuse

Significance: drug-induced lupus

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Anti-Ro (SS-A)

Staining pattern: finely speckled

Significance: cutaneous/neonatal SLE

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Anti-La (SS-B)

Staining pattern: finely speckled

Significance: SLE and Sjogren's syndrome

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Anti-nucleolar RNA

Staining pattern: nucleolar

Significance: SLE, Sjogren's syndrome, Systemic sclerosis

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Anti-centromere

Staining pattern: discrete, speckled

Significance: SLE, mixed connective tissue disease, CREST syndrome

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Rheumatoid factor (IgM), Anti-CCP (cyclic citrullinated peptide)

Rheumatoid Athritis

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Anti-thyroglobulin; anti-microsomal

Hashimoto's thyroiditis (HYPOTHYROIDISM)

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Anti-TSHr; anti-microsomal

Grave's disease

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Anti-islet cells

Type I DM (insulin-dependent/juvenile)

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Anti-MBP (myelin basic protein)

Multiple Sclerosis

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Anti-acetylcholine receptor

Myasthenia gravis (HL-B8) - muscle weakness

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Anti-glomerular basement membrane

Goodpasture's syndrome - glomerulonephritis

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Anti-mitochondrial

Primary Biliary Cirrhosis - obstruction of bile duct

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Anti-smooth muscle

Chronic active hepatitis - autoimmune hepatitis

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Anti-parietal cells

Pernicious anemia (Vit. B12 deficiency)

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Anti-salivary/lacrimal glands

Sjorgen's syndrome

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Anti-centromere

Scleroderma/CREST - thickening of skin/tissue

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Primary Immunodeficiencies (PID)

inherited dysfunctions of immune system

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(PID) Category 1: (SCID) Severe Combined Immunodeficiency

- most serious of the congenital immunodeficiencies

- present in early infancy; life span: 2 YEARS MAX

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(PID) Category 1: Purine-Nucleosidde Phosphorylase Deficiency

- decreased number of T cells due to accumulation of deoxyguanosine triphosphate, a toxic purine metabolite

- moderate to severe CMI

- normal to mildly impaired HI

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(PID) Category 2: Wiskott-Aldrich Syndrome (WAS)

- smallest platelets

- triad: immunodeficiency, eczema, thrombocytopenia

- lethal in childhood bc of infx, hemmorhage, or malignancy

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(PID) Category 2: DiGeorge anomaly/Congenital Thymic Aplasia

- zinc deficiency

- thymus development abnormality

- quantitative defect in T cells

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(PID) Category 2: Ataxia-Telangiectasia (AT)

- cerebral ataxia (involuntary muscle movements)

- telangiectasias (capillary swelling)

- abnormal GENES produce defect of both humoral & cellular immunity

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(PID) Category 3: Transient hypogammaglobulinemia of Infancy

- low lvls of immunoglobulins (5-6 months of age)

- IgG most affected

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(PID) Category 3: Selective IgA Deficiency

- most common CONGENITAL IMMUNODEFICIENCY

- susceptible to respiratory of GI infections

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(PID) Category 3: Bruton's tyrosine kinase (BTK) deficiency

- X-linked inheritance (males mostly)

- lack circulating mature CD19+ B cells

- lack immunoglobulins of all classes

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(PID) Category 3: Common Variable Immunodeficiency

- IgA & IgG deficiency

- spuelike syndrome & malabsorption

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(PID) Category 3: Isolated IgG subclass deficiency

- most common: IgG4

- least: IgG1

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(PID) Category 5: Chronic Granulomatous Disease (CGD)

- defective bacterial digestion (catalase + bacteria)

- X-linked or autosomal recessive

- inability to produce superoxide

- defective NADPH oxidase system

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Neutrophil Oxidative Burst Assay

measures oxidation to rhodamine by the respiratory burst of the leukocyte

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Nitroblue tetrazolium test (NBT)

spx: buffy coat

rgt: Bacterial suspension + NBT dye

(+) result: BLUE FORMZAN ppt

normal: 80-100% blue ppt

CGD:

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(PID) Category 5: Leukocyte Adhesion Deficiency

- deficiency of CD18

- abnormal motility/chemotaxis, adhesion, and endocytosis

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Plasma Cell Dyscrasia

- overproduction of a single immunoglobulin component (Myeloma protein - M)

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Multiple Myeloma

- most serious & common of the plasma cell dyscrasia

- malignant plasma cells (CD38, CD56, CD138)

- presence of Bence-Jones protein in urine ( neg on urine strip, positive on SSA ppt)

- hypercalcemia, renal insufficiency and anemia

- 10% of bone marrow cells

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Multiple Myeloma turbidity

ppt @ 40-60C = turbid

redissolves @ 100C = no turbidity

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Waldenstrom macroglobulinemia

- malignant proliferation of IgM producing plasma cells

- HYPERVISCOSITY due to obstruction of blood vessels

- elevated serum monoclonal protein (macroprotein or IgM paraprotein) that migrates in the gamma region during SPE

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Cryoglobulins

precipitate at cold temperatures and can occlude small vessels in the extremities in cold weather