Jo-1, Thymus (Histidyl t-RNA Synthetase)

The Jo-1 antigen is histidyl-transfer ribonucleic acid (t-RNA) synthetase. This enzyme is partially responsible for attaching t-RNA to their cognate rRNA (2). The Jo-1 antigen migrates as a 53 kD protein on SDS-PAGE. \n\nAnti-Jo-1 autoantibodies were originally described as precipitating autoantibodies in sera of patients with polymyositis. It was later realized that the anti-Jo-1 antibodies were specific for patients with polymyositis. The target for the anti-Jo-1 antibodies was one of a family of distinct cellular enzymes, the aminoacyl t-RNA synthetases (1). \n\nThe presence of autoantibodies against the Jo-1 antigen has been reported in up to 23% of polymyositis patients by immunodiffusion (3). Anti-Jo-1 antibodies are almost completely specific for myositis, being more common in polymyositis than dermato-myositis(4), and rare in children (5). The presence of anti-Jo-1 antibodies defines a distinct group of polymyositis patients with interstitial disease, arthritis, and fevers (6). The anti-Jo-1 response appears to be self-antigen driven, having a broad spectrotype over time undergoing isotype switching. Anti-Jo-1 antibodies also inhibit the function of human histidyl tRNA synthetase more than they do from other species (6). \n\nRecent developments in ELISA meology have increased the sensitivity therefore the diagnostician's ability to quantitate patient antibody titers.\n\nApplication:\nRecommended for use in standard solid phase immunoassays.\n\nUnit Definition: One unit of activity is the amount of antigen that will generate an absorbance of 1.2 when assayed using standard procedure for enzyme immunoassay. Activity will vary with assay conditions/protocols.\n\nStorage Conditions:\nProduct unstable above 0 degrees C, aliquot and store frozen at -70 degrees C. Avoid repeated freeze-thaw.

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SPECIFICATIONS

Catalog Number

J4998

Size

1000U

Applications

ELISA

Form

Supplied as a frozen liquid in 0.01M Tris, 0.5M sodium chloride, 0.02% sodium azide, 50% glycerol.

Purity

Purified from calf and/or rabbit thymus through the use of immobilized human anti-Jo-1 immune globulins. Other antigens (Sm, RNP, SSA, Scl-70, and SSB) are not detected with ELISA assays. Homogeneity is verified by SDS PAGE.

References

1. Targoff IN, Reichlin M. \"Measurement of Antibody to Jo-1 by ELISA and Comparison to Enzyme Inhibitory.\" A of Immun: Vol: 138, 1987, pg 2874-2882. \n2. Hershey JWB. \"The Translational Machinery: Components and Mechanism.\", Cell Biology, Vol: 4, 1980, pg 1-68. \n3. Nishikai M and Reichlin M. \"Heterogeneity of Precipitating Antibodies in Polymyositis and Dermatomyositis, Terization of the Jo-1 Antibody System.\" Arthritis Rheum,1980, pg 881. \n4. Reichlin M, Maddison PJ, Targoff IN, Bunch T, Arnett FC, Sharp GC, Treadwell E, and Tan EM. \"Antibodies Nuclear/Nucleolar Antigen in Patients with Polymyositis Overlap Syndrome.\" J Clin Immunol, 1984. \n5. Pachman LM, Hardin JA, Cobb MA, and Arroyave CM. \"The Antinuclear Antibody (ANA) in Juvenile Dermatomyositis (JDMS) is not Jo-1, Suggesting that JDMS and Polymyositis (PM) are Different Diseases.\"Arthritis Rheum. , 1984. \n6. Takeuchi K, Tan EM, Pollard KM. \"Similarity of Epitopes of an Autoantigen Fibrillarin-Recognized by Human Immmune Sera and Murine Autoimmune Models.\" American College of Rheum, 56th Annual Scientific 0ct 11-15, 1992, Atlanta. Poster Presentations.