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Complement activation in acute glomerulonephritis in children.
Serial determinations of complement components (C1q, C4, C3, C5 and factor B) were performed in 32 children with acute glomerulonephritis. Low levels of C3 were found in 30 patients and low levels of C5 in 26. The findings of reduced C1q and/or C4 levels (25 patients) in the first days of the disease suggest activation of the classical pathway. Depressed Factor B levels were found rarely (4 patients). In all patients, the presence of a C3 splitting activity and/of a C3 nephritic factor-like activity was investigated. Both activities were demonstrated in 7 patients whereas in another patient, only C3 splitting activity was noted. A disappearance of both activities was observed in all patients. In 3 patients tested, the C3 nephritic factor-like activity was heat-labile and was therefore not related to true C3 nephritic factor. Both pathways are implicated in the early phases of the disease but continued C3 depression is probably through alternate pathway.
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