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Master's Dissertation
Full name
Nádia Emi Aikawa
Knowledge Area
Date of Defense
São Paulo, 2011
Sallum, Adriana Maluf Elias (President)
Ferriani, Virginia Paes Leme
Pastorino, Antonio Carlos
Title in Portuguese
Autoanticorpos órgão-específicos e sistêmicos em pacientes com lúpus eritematoso sistêmico juvenil e dermatomiosite juvenil
Keywords in Portuguese
Dermatomiosite juvenil
Especificidade de órgãos
Lúpus eritematoso sistêmico
Abstract in Portuguese
Objetivo: Ao nosso conhecimento, não há estudos na literatura avaliando simultaneamente um grande número de autoanticorpos órgãoespecíficos, bem como a prevalência de doenças autoimunes órgãoespecíficas em populações com lúpus eritematoso sistêmico juvenil (LESJ) e dermatomiosite juvenil (DMJ). Portanto, o objetivo deste estudo foi avaliar autoanticorpos e doenças autoimunes órgão-específicas em pacientes com LESJ e DMJ. Métodos: Quarenta e um pacientes com LESJ e 41 com DMJ foram investigados para os autoanticorpos séricos associados com hepatite autoimune, cirrose biliar primária, diabetes melito tipo 1 (DM1), tireoidite autoimune, gastrite autoimune e doença celíaca. Pacientes com positividade para anticorpos órgão-específicos foram avaliados para a presença das respectivas doenças autoimunes órgão-específicas. Resultados: A média de idade ao diagnóstico foi significativamente maior em pacientes com LESJ em comparação com DMJ (10,3 ± 3,4 vs. 7,3 ± 3,1 anos, p=0,0001), enquanto a média de duração da doença foi similar em ambos os grupos (p=0,92). As freqüências de autoanticorpos órgão-específicos foram semelhantes nos pacientes com LESJ e DMJ (p>0,05). Notavelmente, uma alta prevalência de autoanticorpos relacionados a tireoidite autoimune e DM1 e foi observada em ambos os grupos (20% vs. 15%, p=0,77 e 24% vs. 15%, p=0,41, respectivamente). A elevada freqüência de fator antinúcleo - FAN (93% vs. 59%, p=0,0006), anti-DNA (61% vs. 2%, p<0,0001), anti-Ro (35% vs. 0%, p<0,0001 ), anti-Sm (p=0,01), anti-RNP (p=0,02), anti-La (p=0,03) e aCL IgG (p=0,001) foram observadas em pacientes com LESJ em comparação com DMJ. Doenças autoimunes órgão-específicas foram evidenciadas apenas em pacientes com LESJ (24% vs. 0%, p=0,13). Dois pacientes com LESJ apresentavam DM1 associada com tireoidite de Hashimoto e um terceiro paciente apresentava tireoidite subclínica. Outro paciente com LESJ preenchia diagnóstico de doença celíaca com base em anemia por deficiência de ferro, a presença de anticorpo anti-endomísio, biópsia duodenal compatível com doença celíaca e resposta a dieta livre de glúten. Conclusão: Doenças órgão-específicas foram observadas apenas em pacientes com LESJ e exigiram tratamento específico. A presença destes anticorpos sugere a avaliação de doenças órgão-específicas e um acompanhamento rigoroso destes pacientes
Title in English
Organ-specific and systemic autoantibodies in patients with juvenile systemic lupus erythematosus and juvenile dermatomyositis
Keywords in English
Juvenile dermatomyositis
Specificity to organs
Systemic lupus erythematosus
Abstract in English
Objective: To our knowledge, no study has assessed simultaneously a large number of organ-specific autoantibodies, as well as the prevalence of organ-specific autoimmune diseases in juvenile systemic lupus erythematosus (JSLE) and juvenile dermatomyositis (JDM) populations. Therefore, the purpose of this study was to evaluate organ-specific autoantibodies and autoimmune diseases in JSLE and JDM patients. Methods: Forty-one JSLE and 41 JDM patients were investigated for serum autoantibodies associated with autoimmune hepatitis, primary biliary cirrhosis, type 1 diabetes mellitus (T1DM), autoimmune thyroiditis, autoimmune gastritis and celiac disease. Patients with positive organspecific antibodies were assessed for the presence of the respective organ-specific autoimmune diseases. Results: Mean age at diagnosis was significantly higher in JSLE compared to JDM patients (10.3±3.4 vs. 7.3±3.1years, p=0.0001), whereas the mean disease duration was similar in both groups (p=0.92). The frequencies of organ-specific autoantibodies were similar in JSLE and JDM patients (p>0.05). Of note, a high prevalence of autoantibodies related to T1DM and autoimmune thyroiditis were observed in both groups (20% vs. 15%, p=0.77 and 24% vs. 15%, p=0.41; respectively). Higher frequencies of antinuclear antibody - ANA (93% vs. 59%, p=0.0006), anti-dsDNA (61% vs. 2%, p<0.0001), anti-Ro (35% vs. 0%, p<0.0001), anti-Sm (p=0.01), anti-RNP (p=0.02), anti-La (p=0.03) and IgG aCL (p=0.001) were observed in JSLE compared to JDM patients. Organ-specific autoimmune diseases were evidenced only in JSLE patients (24% vs. 0%, p=0.13). Two JSLE patients had T1DM associated with Hashimoto thyroiditis and another had subclinical thyroiditis. Another JSLE patient had celiac disease diagnosis based on iron deficiency anaemia, presence of anti-endomysial antibody, duodenal biopsy compatible to celiac disease and response to a gluten-free diet. Conclusion: Organ-specific diseases were observed solely in JSLE patients and required specific therapy. The presence of these antibodies recommends the evaluation of organ-specific diseases and a rigorous follow-up of these patients
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