Determination of IgA,IgG,IgM class—specific rheumatoid factors and its clinical evaluation

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Li Xiaojun Wu Jianguo Dept.of Clinical Immunology
Jin Ling Hospital Nanjing China
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<正> Solid phase enzyme-linked immunosorbent assay(ELISA) for detectingclass-specific RF was established.Aggregated rabbit IgG is used as coating antigenand the presence of RF is demonstrated by F(ab')2 fragment of anti-human Igconjugated to horseradish peroxidase(HRP).The results showed that high levels ofIgM-RF,IgG-RF and IgA-RF were found in patients with rheumatoid arthritis butnot found in other patients.A positive correlation existed between IgM-,IgG-,IgA-RF and disease activity.The presence of vasculitis was also correlated positivelywith the levels of the 3 class-specific RF.
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