alexa High diagnostic performance of ELISA detection of antibodies to citrullinated antigens in rheumatoid arthritis.
Pharmaceutical Sciences

Pharmaceutical Sciences

Pharmaceutica Analytica Acta

Author(s): Suzuki K, Sawada T, Murakami A, Matsui T, Tohma S,

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Abstract OBJECTIVE: We investigated the rheumatoid arthritis (RA) diagnostic performances of anti-cyclic citrullinated peptide antibody (anti-CCP) and antifilaggrin antibody (AFA) in comparison with RF and matrix metalloproteinase-3 (MMP-3). METHODS: We used a second generation enzyme-linked immunosorbent assay (ELISA) kit for the detection of anti-CCP. We constructed recombinant human filaggrin, which was citrullinated in vitro by human peptidylarginine deiminase, and subsequently used it as the coating antigen for AFA-ELISA. A total of 549 RA patients and 208 other rheumatic disease patients were included in the study. RESULTS: The specificities of anti-CCP (88.9\%) and AFA (94.7\%) were superior to those of RF (81.7\%) and MMP-3 (49.5\%). The sensitivity of anti-CCP (87.6\%) was superior to all others. However, the sensitivity of AFA (68.7\%) was inferior to those of RF (69.8\%) and MMP-3 (75.7\%). Furthermore, receiver operating characteristic curves of anti-CCP and AFA passed closer to the upper left corner than those of RF and MMP-3, and the areas under the curves (AUC) of AFA and anti-CCP were significantly larger. In addition, the AUC of anti-CCP was significantly larger than that of AFA. CONCLUSION: ELISA detection of antibodies to citrullinated antigens, especially a second generation anti-CCP, showed higher discriminative ability than other assays, including RF, and would be useful to aid the diagnosis of RA in clinical practice.
This article was published in Scand J Rheumatol and referenced in Pharmaceutica Analytica Acta

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