Other Autoimmune (RA and Scleroderma) lecture Flashcards
RA is a/w HLA-___.
DRB1
What cell type is primarily responsible for joint destruction in RA?
T-cell: There is B-cell too, but they are activated by T-cells
What is meant by pannus invasion of joints?
Synovial proliferation destroys adjacent bone and cartilage
What direction is typical deviation of wrists and fingers in RA?
Wrist - radial
Fingers - ulnar
What are the immunoglobulins most commonly involved in RA and what are their actions?
IgM against Fc portion of IgG
What type of hypersensitivity is responsible for the joint involvement in RA?
Type III - Immune complexes in synovial fluid and membrane
What titer is a/w the prognosis of RA?
RF+ is poor prognosis
RF- is good prognosis
40 y.o. female presents with proximal joint swelling and pain. She is also found to have rheumatoid factor titers and firm, moveable nodules on her fingers. What is expected on histo of the nodules?
Central fibrinoid necrosis surrounded by epithelial histiocytes, lymphs, and plasma cells.
Note: There is no RBC involvement (as opposed to gonococcal arthritis)
What cells are responsible for protease and elastase involvement in RA? What about collagenase, osteoclast activation, and endothelial adhesion?
Neutrophils and synoviocytes release protease and elastase
Macrophages and synoviocytes release IL-1 and TNF-a
What is the pathophysiology behind organ involvement in RA?
Vasculitis in small to medium arteries causes reduced blood flow and ischemia
Anti-topoisomerase is primarily a/w ______ _______.
Diffuse scleroderma
What is the antibody a/w CREST?
anti-centromere
What does CREST stand for?
Calcinosis Raynaud's Esophageal dysfunction Sclerodactyly Telangietesia: Dilated capillaries --> red/purple clusters
What two cell types are primarily responsible for the early phase of scleroderma?
CD4 and macrophages
What are the hallmark facial features of scleroderma?
Absence of wrinkles, skin tightness, and down turned or open mouth
