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Anti-Jo1 is an anti-nuclear antibody. [1] [2] Anti-Jo1 has been associated with inflammatory myopathies such as polymyositis, dermatomyositis and antisynthetase syndrome. [3] [4] It has histidine-tRNA ligase as a target.
Those with anti-Jo1 antibodies had less remission of myositis and more relapses than those with anti-PL-12 and anti-PL-7 antibodies. [64] Anti-Jo-1 and anti-Ro52 antibodies co-occurring were linked to an increased risk of neoplasm, a symptomatic severe variant of interstitial lung disease, myositis, and arthritis exacerbation. [20]
Around 80% of people with DM test positive for ANA and around 30% of people have myositis-specific autoantibodies which include antibodies to aminoacyl-tRNA synthetases (anti-synthetase antibodies), including antibodies against histidine—tRNA ligase ; antibodies to signal recognition particle (SRP); and anti-Mi-2 antibodies. [12]
It can also be associated with underlying cancer. The main classes of idiopathic inflammatory myopathy are polymyositis (PM), dermatomyositis (DM) (including juvenile, amyopathic, and sine-dermatitis form), inclusion-body myositis (IBM), immune-mediated necrotising myopathy (IMNM), and focal autoimmune myositis. [1]
anti-Scl70 (for Scleroderma) anti-Jo (for Dermatomyositis) Sensitivity and specificity of these tests depends on the type of assay employed, and will therefore vary by lab. The following table illustrates the sensitivity and specificity of ENA antibodies at detecting SLE with the ELISA technique.
Polymyositis and the associated inflammatory myopathies have an associated increased risk of cancer. [3] The features they found associated with an increased risk of cancer were older age, age greater than 45, male sex, difficulty swallowing, death of skin cells, cutaneous vasculitis, rapid onset of myositis (<4 weeks), elevated creatine kinase, higher erythrocyte sedimentation rate and higher ...
Certain autoantibodies (antibodies that target muscle cells) can also be found in the blood, which can indicate that myositis is caused by an autoimmune disease. [3] Some specific examples of autoantibodies are Anti-Jo-1, Anti-HMGCR, Anti-TIF1, etc. [3]
The exact cause is unclear. A combination of consistent findings on physical examination, the presence of anti HMG-CoA reductase antibodies in a person with myopathy, evidence of muscle breakdown, and muscle biopsy diagnose SAAM. [3] Treatment involves stopping the associated statin medication and taking medication to suppress the immune system.