Journal
SCANDINAVIAN JOURNAL OF IMMUNOLOGY
Volume 53, Issue 6, Pages 622-626Publisher
BLACKWELL SCIENCE LTD
DOI: 10.1046/j.1365-3083.2001.00934.x
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An 8-year-old son (L.A.S.) of consanguineous parents, presented recurrent bacterial infections, vasculitis and extremely low levels of serum C3 (0.15 mug/ml). The classical and alternative pathway haemolytic activities and the generation of opsonins and chemotactic factors derived from the activation of the complement system were markedly affected in the proband's serum. An in vitro addition of purified C3 restored the classical pathway-dependent haemolytic activity of his serum. Autoradiographs of the proband's lipopolysaccharide (LPS)-stimulated and S-35-labelled fibroblast supernatants after that the SDS-PAGE revealed no C3 alpha or beta chains. The amount of C3 mRNA synthesized by the proband's fibroblasts, as evaluated by reverse transcription-polymerase chain reaction (RT-PCR) assays, was greatly reduced.
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