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Artículo en Inglés | IMSEAR | ID: sea-19291

RESUMEN

The present study was conducted to examine the usefulness of anti-C1q antibody as a marker of disease activity in Indian patients with systemic lupus erythematosus (SLE). We standardized the assay for detection of IgG anti-C1q antibody using ELISA. The normal cut-off level was determined by testing 57 healthy, age and sex matched controls to be 53 units/m1 (mean +/- 2 SD). Patients with SEL (97 females and 13 males) were studied and the following parameters were obtained on all: SLE disease activity index (SLEDAI), anti-C1q, anti-ds DNA and C3. Correlations were tested between these parameters using Spearman's rank correlation coefficients. Anti-C1q was found positive in 66 (60%) patients while anti-ds DNA was found in 78 (71%). The positive predictive values of anti-C1q and anti-ds DNA for lupus nephritis were 59 and 61 per cent respectively. The titres of anti-C1q correlated positively with SLEDAI (P < 0.01) and anti-ds DNA (P < 0.01) and negatively with C3 levels (P < 0.001). No significant correlation was observed between anti-C1q positivity and any particular organ involvement. Similarly, no correlation was found between anti-C1q and proliferative lupus nephritis. Anti-C1q was found positive in 5 of 9 patients with moderate SLEDAI scores and negative for anti-ds DNA antibody. It is concluded that anti-C1q antibody can serve as a general marker for lupus activity, supplementing the currently used serum markers.


Asunto(s)
Adolescente , Adulto , Anticuerpos/análisis , Anticuerpos Antinucleares/análisis , Biomarcadores , Complemento C1q/inmunología , ADN/inmunología , Femenino , Humanos , Lupus Eritematoso Sistémico/diagnóstico , Masculino , Persona de Mediana Edad
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