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Anti-DNase I antibodies in systemic lupus erythematosus: diagnostic value and share in the enzyme inhibition

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Abstract

Diagnostic accuracy of anti-DNase I antibodies measurement in a differentiation between SLE and other autoimmune rheumatic diseases was evaluated. The share of anti-DNase I and actin in the DNase I activity decrease in SLE was established. Serum samples were obtained from 54 patients with verified SLE, 52 control patients with other autoimmune rheumatic diseases, and 44 healthy persons. Anti-DNase I concentrations were measured by ELISA. Free and actin inhibited DNase I activities were evaluated in the fresh serum samples. The appraisal of antibodies and actin effects on DNase I activity was made using multiple regression. Anti-DNase I antibodies were positive in 35 SLE and 8 control patients, without significant difference between the mean antibody concentrations. Sensitivity of this test was 64.81 %, and specificity—84.62 %. Mean free DNase I activity in SLE was somewhat lower than in the control group as a result of augmented frequency of extremely low enzyme activities. On the contrary, after the exclusion of the latter cases we have revealed elevated mean free DNase I activity in the other SLE patients comparing to the similar control subgroup. Unlike the controls, low serum DNase I activity in SLE arose not only from actin and antibody action, but also, in half of the cases, from unidentified factor, related to active SLE. The accuracy of the anti-DNase I antibodies measurement is approximate to the present reference standard of SLE diagnostics. We first demonstrated that neither antibodies nor actin caused DNase I activity decrease in SLE.

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Correspondence to A. S. Trofimenko.

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Conflict of interest

A. S. Trofimenko, I. P. Gontar, A. B. Zborovsky, and O. V. Paramonova declare that they have no conflict of interest.

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All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki Declaration and its later amendments or comparable ethical standards.

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Informed consent was obtained from all individual participants included in the study.

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Online Resource 1

Distributions of anti-DNase I concentrations in the reference, control, and SLE group. Dotted line marks cutoff point for the positive results. Means and standard errors for entire groups are also indicated (TIFF 89262 kb)

Online Resource 2

Dependence between fDNase concentrations and SELENA–SLEDAI scores in SLE patients. Columns and error bars represent means and 95 % CI, respectively. In subgroups without any dispersion, 95% CI are not shown (TIFF 102461 kb)

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Trofimenko, A.S., Gontar, I.P., Zborovsky, A.B. et al. Anti-DNase I antibodies in systemic lupus erythematosus: diagnostic value and share in the enzyme inhibition. Rheumatol Int 36, 521–529 (2016). https://doi.org/10.1007/s00296-016-3437-z

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