Antinucleosome antibodies in patients with juvenile systemic lupus erythematosus.

Este estudo teve por objetivos avaliar a positividade do anticorpo antinucleossomo (anti-Ncs) no LES juvenil, sua associação com manifestações e atividade da doença e compará-lo ao anticorpo anti-DNA. A pesquisa dos anticorpos anti-Ncs e anti-DNA foi realizada em 74 pacientes com LESJ e 64 controles. Os anti-Ncs e anti-DNA demonstraram sensibilidade de 52.7% e 54% e especificidade de 98.4% e 95.3%, respectivamente. Nesta população, foi observada discordância de 25.7% entre os anticorpos, sugerindo que os mesmos sejam complementares em termos diagnósticos. Houve associação entre anti-Ncs e rash malar, anemia hemolítica, FAN, anti-DNA e diminuição de C3 e C4, mas não com o quadro renal. Os títulos do anti-Ncs correlacionaram-se à atividade da doença (SLEDAI), demonstrando seu valor prognóstico.The aims of this study were to evaluate the positivity of antinucleosome antibodies (Anti-Ncs) in SLE children, their association to disease manifestations and activity, and to compare them to anti-DNA antibodies. Anti-Ncs and anti-DNA were tested on 74 JSLE patients and 64 controls. Anti-Ncs and anti-DNA showed sensitivity of 52.7% and 54% and specificity of 98.4% and 95.3%, respectively. The discordance of 25.7% between the antibodies found on the studied population suggests that they may have a complementary diagnosis role. Anti-Ncs were associated to malar rash, hemolytic anemia, ANA, anti-DNA and low complement levels, but no association was observed to renal manifestations. The correlation observed between anti-Ncs titers and disease activity (SLEDAI) demonstrated its prognostic value