Laboratory Medicine ›› 2017, Vol. 32 ›› Issue (4): 316-321.DOI: 10.3969/j.issn.1673-8640.2017.04.016

• Orginal Article • Previous Articles     Next Articles

Correlation of systemic lupus erythematosus clinical phenotypes with anti-double-stranded DNA antibodies and performance comparison of 4 commercial determination kits

SONG Rui1, YE Ping1, WEI Chaohui2, CHEN Xiaoxiang1, WANG Jiucun3   

  1. 1. Renji Hospital,Shanghai Jiaotong University School of Medicine,Shanghai 200001,China
    2. Innovent Biologics,Soochow 215123,Jiangsu,China
    3. Department of Biological Science,Fudan University,Shanghai 200433,China
  • Received:2016-08-29 Online:2017-04-20 Published:2017-05-01

Abstract:

Objective To compare the performance of 4 commercial determination kits for anti-double-stranded DNA (dsDNA)antibodies,to analyze the correlation of 15 typical systemic lupus erythematosus (SLE)clinical phenotypes with anti-dsDNA antibodies,and to provide a reference for the diagnosis and monitoring of SLE. Methods A total of 229 SLE patients were enrolled,and 112 patients with other connective tissue diseases were enrolled. Their serum samples were collected. There were 10 typical SLE clinical phenotypes and 5 parameters. All SLE patients were evaluated according to SLE disease activity index (SLEDAI). The levels of anti-dsDNA antibodies were determined by 4 commercial determination kits [kit A using indirect immunofluorescence assay(IFA),kit B and kit C using enzyme-linked immunosorbent assay(ELISA)and kit D using radioimmunoassay]. The performance of the 4 commercial determination kits was evaluated. The correlation of typical SLE clinical phenotypes and parameters with anti-dsDNA antibodies was analyzed. Results The results of 4 commercial determination kits had statistical significance(P<0.01). Kit C had the highest Youden's index,its Youden's index was higher than those of kit B and kit D,and that of kit A was the lowest. The results of kit B,C and D had correlations with SLEDAI (r= 0.482,0.512 and 0.685,P<0.01). For 10 typical SLE clinical phenotypes and 5 parameters,anti-dsDNA antibodies were correlated positively with increasing anti-nucleosome antibody and decreasing complement (P<0.01). The results of positive anti-nuclear antibodies (P<0.05),nephropathy (P<0.05),leukopenia (P<0.05) and malar rash(P<0.05) in 2 kits were positively correlated with anti-dsDNA antibodies. The other 8 typical SLE clinical phenotypes,including thrombocytopenia and peripheral arthritis,showed no correlation with anti-dsDNA antibodies. Conclusions The performance of 4 commercial determination kits is different. Kit C is adapted to screen SLE,and kit D is suitable for monitoring the activity of SLE. Nephropathy,malar rash,anti-nucleosome antibody,anti-nuclear antibody,decreasing complement and leukopenia are correlated with anti-dsDNA antibodies.

Key words: Anti-double-stranded DNA antibodies, Systemic lupus erythematosus, Clinical phenotypes

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