Gene/Protein Disease Symptom Drug Enzyme Compound
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Query: UMLS:C0024141 (systemic lupus erythematosus)
 44,322 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

Anti-nucleosome antibodies have a role in the diagnosis and follow-up of systemic lupus erythematosus (SLE) and have a possible correlation with SLE activity and with kidney and hematological involvement. The aim of our study was to detect in 91 patients with rheumatoid arthritis (RA) the positivity of anti-nucleosome antibodies during therapy with three different TNFalpha blocking agents and to underline the possible correlation with the development of antinuclear autoantibodies (ANA) and anti-dsDNA autoantibodies. We detected anti-nucleosome antibodies, ANA, and anti-dsDNA during therapy with three different TNFalpha blocking agents at T-0 and after 12 and 24 weeks of treatment, respectively. Anti-nucleosome antibodies (IgG class) were analyzed by ELISA technique (Orgentec Diagnostika GmbH, Mainz, Germany), ANA both by indirect immunofluorescence (IIF) technique on Hep-2 (Scimedx, USA) and by ELISA (Autoimmune EIA ANA screening test Bio-Rad Laboratories, CA, USA), and anti-dsDNA (IgG and IgM classes) by ELISA (Kallestad, Bio-Rad Laboratories, CA, USA) and confirmed by IIF on Crithidia luciliae (ImmunoConcepts N.A., Sacramento, CA, USA). We observed 19 patients on infliximab treatment at 3 mg/kg every 8 weeks, 43 patients on etanercept treatment at 25 mg twice a week, and 29 patients on adalimumab treatment at 40 mg every other week. At baseline, we observed positivity as follow: in the group of patients treated with infliximab-anti-nucleosome 1/19 (5.26%), ANA 3/19 (15.7%), anti-dsDNA 1/19 (5.26%); in the group treated with etanercept--anti-nucleosome 2/43 (4.65%), ANA 1/43 (2.43%), anti-dsDNA 0/43; and in the group treated with adalimumab--anti-nucleosome 2/29 (6.89%), ANA 1/29 (3.44%), anti-dsDNA 0/29. The results at 12 weeks for the three autoantibodies were: for infliximab--3/19 (15.7%), 10/19 (52.6%), 2/19 (10.5%); for etanercept--3/43 (6.9%), 10/43 (23.2%), 1/43 (2.32%); and for adalimumab--3/29 (10.3%), 4/29 (13.7%), 1/29 (3.4%). At 24 weeks, the results were for infliximab 6/19 (31.5%), 12/19 (63.1%), 2/19 (10.5%); for etanercept 11/43 (25.5%), 22/43 (51.1%), 2/43 (4.65%); and for adalimumab 4/29 (13.7%), 13/29 (44.8%), 1/29 (3.4%). We observed a concordance anti-nucleosome/ANA antibodies of 85.5% (p < 0.001). Our data showed a concordance between anti-nucleosome antibodies and ANA positivity in patients with RA during therapy with TNFalpha blocking agents. The induction of autoantibodies positivity is different for each TNFalpha blocking agent.
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PMID:Anti-nucleosome antibodies as prediction factor of development of autoantibodies during therapy with three different TNFalpha blocking agents in rheumatoid arthritis. 1792 76

Anti-dsDNA antibodies are a heterogeneous group of antibodies, quite specific for SLE. Their variability is related to the assay used, the immunoglobulin class secondary antibody, and the dsDNA source. The standardization of measuring anti-dsDNA antibodies is still poor and different methods yield different results. Several novel technologies were developed during the last decades that represent viable alternatives to the traditional methods such as the chemiluminescent immunoassay (CIA) and multiplex flow immunoassay (MFI). Additionally, positive results for anti-dsDNA antibodies can be detected in patients with inflammatory arthritis (IA) treated with different biologics reducing its clinical specificity for SLE. Anti-dsDNA antibody levels were evaluated in 246 patient samples: 70 SLE and 176 disease control (including 96 IA during treatment with different biologics), using three enzyme immunoassays (indirect enzyme immunoassay, Bio-Rad Laboratories; chemiluminescent immunoassay, Inova Diagnostics; multiplex flow immunoassay, Bio-Rad Laboratories) and three Crithidia luciliae immunofluorescence tests (CLIFT) (Euroimmun AG, Bio-Rad Laboratories, INOVA Diagnostics). Diagnostic performances were assessed both including and excluding the IA patients. Agreements, measured by the Cohen's Kappa between all methods, ranged from moderate to substantial (0.47-0.68). The clinical sensitivities for the anti-dsDNA antibody tests varied from 5.7% by CLIFT A up to 33.3% provided by EIA while the clinical specificities varied from 89.8% by MFI to 98.9% provided by CLIFT B and C. Newer technologies, such as MFI and CIA, showed great potential as a diagnostic application. Significant variations among anti-dsDNA antibody assays were observed confirming the lack of standardization.
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PMID:Analytical variability in the determination of anti-double-stranded DNA antibodies: the strong need of a better definition of the old and new tests. 2962 13


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