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      Anti-alpha-fodrin antibodies in patients with Sjögren's syndrome secondary to rheumatoid arthritis Translated title: Anticorpos antialfafodrina em pacientes com síndrome de Sjögren secundária a artrite reumatoide

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          Abstract

          ABSTRACT Introduction: The Sjögren's syndrome (SS) is an autoimmune disease characterized by lymphocytic infiltration. The currently most researched antibodies for its diagnosis are anti-La and anti-Ro, which, however, have low specificity in the case of SS secondary to rheumatoid arthritis (RA) and systemic lupus erythematosus (SLE). The antibodies against alpha-fodrin (AF) have been proposed to diagnose SS. Objective: In the present study, we investigated the anti-AF antibody in a group of RA patients with and without secondary SS (sSS). Methods: Were studied 90 consecutive patients with RA (48.8% of them with SS), and samples of 45 healthy volunteers. Anti-AF immunoglobulin class G (IgG) and anti-AF immunoglobulin class A (IgA) were investigated by enzyme-linked immunosorbent assay (ELISA) and were considered positive when >15 U/ml. Demographic, clinical, and serological data were obtained from chart reviews. Results: Anti-AF IgA was positive in 46/90 (51.1%) of the RA sample and 3/45 (6.7%) of controls (p < 0.001); anti-AF IgG was found in 21/90 (23.3%) of RA patients and none of controls (p = 0.037). Neither IgA nor IgG anti-AF antibodies showed significant difference in patients with and without sSS. Conclusion: In our study, anti-AF IgA and anti-AF IgG neither alloweded diagnosis of sSS in RA patients, nor marked any special clinical or serological finding.

          Translated abstract

          RESUMO Introdução: A síndrome de Sjögren (SS) é uma doença autoimune caracterizada por infiltração linfocítica. Atualmente os anticorpos mais pesquisados para seu diagnóstico são anti-Ro e anti-La, que, no entanto, apresentam baixa especificidade nos casos de SS secundária a artrite reumatoide (AR) e lúpus eritematoso sistêmico (LES). Os anticorpos contra alfafodrina (AF) foram propostos para diagnosticar SS. Objetivo: Investigamos o anticorpo anti- AF em um grupo de portadores de AR com e sem SS secundária (SSs). Material e métodos: Foram estudados 90 pacientes consecutivos com AR (48,8% com SS) e amostras de 45 voluntários saudáveis. Imunoglobulina da classe G (IgG) e imunoglobulina da classe A (IgA) anti-AF foram investigadas por ensaio imunossorvente ligado à enzima (ELISA), sendo consideradas positivas quando acima de 15 U/ml. Dados demográficos, clínicos e sorológicos foram obtidos a partir de revisão de prontuários. Resultados: IgA anti-AF foi positiva em 46/90 (51,1%) das amostras com AR e 3/45 (6,7%) das amostrascontrole (p < 0,001); IgG anti-AF foi encontrada em 21/90 (23,3%) de pacientes com AR e nenhum dos controles (p = 0,037). Nem IgA anti-AF nem IgG anti-AF conseguiram diferenciar pacientes com e sem SSs. Conclusão: IgG anti-AF e IgA anti-AF foram investigadas e não contribuíram especificamente para diferenciar pacientes com AR que sofrem ou não de SS, além de não conseguirem estabelecer o diagnóstico de SS em pacientes com AR.

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          The importance of alpha-fodrin antibodies in the diagnosis of Sjögren's syndrome

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            Rheumatology

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              Sjögren syndrome - study of autoantigens and autoantibodies

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                Author and article information

                Contributors
                Role: ND
                Role: ND
                Role: ND
                Role: ND
                Role: ND
                Role: ND
                Journal
                jbpml
                Jornal Brasileiro de Patologia e Medicina Laboratorial
                J. Bras. Patol. Med. Lab.
                Sociedade Brasileira de Patologia Clínica, Sociedade Brasileira de Patologia, Sociedade Brasileira de Citopatologia
                1678-4774
                June 2016
                : 52
                : 3
                : 137-141
                Affiliations
                [1 ] Faculdade Evangélica do Paraná Brazil
                [2 ] Universidade Positivo Brazil
                [3 ] Universidade Federal do Paraná Brazil
                Article
                S1676-24442016000300137
                10.5935/1676-2444.20160023
                1fb06634-3744-473a-aac1-2e53812e53c1

                This work is licensed under a Creative Commons Attribution 4.0 International License.

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                SciELO Brazil

                Self URI (journal page): http://www.scielo.br/scielo.php?script=sci_serial&pid=1676-2444&lng=en
                Categories
                MEDICAL LABORATORY TECHNOLOGY
                MEDICINE, RESEARCH & EXPERIMENTAL
                PATHOLOGY

                Pathology,Medicine,Clinical chemistry
                autoanticorpos,síndrome de Sjögren,Sjögren's syndrome,autoimmunity,autoantibodies,arthritis rheumatoid,autoimunidade,artrite reumatoide

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