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- W304295492 abstract "1. Haemolytic activity corresponding to that of the first component of complement (C1) was synthesized and secreted by all nine human fibroblast cell lines examined. No activity was found in the culture media of a variety of other human cell lines. 2. The component-C1 haemolytic activity secreted by the fibroblast lines behaved in an identical manner, in most respects, with that of the component-C1 haemolytic activity of human serum. The component-C1 haemolytic activity secreted by fibroblasts, however, was less susceptible to inhibition by rabbit fragment F(ab′)2 anti-(human subcomponent C1q) than was the component-C1 haemolytic activity of human serum. 3. Biosynthesis of fibroblast component-C1 haemolytic activity was inhibited by the presence of cycloheximide and regained on its removal. 4. Incorporation of radioactivity into proteins secreted by the fibroblasts and release of component-C1 haemolytic activity by the fibroblasts both increased in a linear manner until several days after the cultures had reached a state of confluent growth. 5. Radioactivity was incorporated into subcomponents C1q, C1r and C1s, as judged by the formation of specific immunoprecipitates and by absorption with immune aggregates. 6. The immunoprecipitates formed by using antisera against subcomponents C1r and C1s were run on polyacrylamide gels in sodium dodecyl sulphate, and this provided convincing physiochemical evidence for the biosynthesis of these subcomponents de novo. 7. The results obtained with immunoprecipitates formed by using anti-(subcomponent C1q) suggest that subcomponent C1q may be synthesized and secreted by fibroblast cell lines in vitro, in a form with a higher molecular weight than that of subcomponent C1q which is isolated by conventional techniques of protein fractionation from fresh serum." @default.
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- W304295492 date "1977-12-01" @default.
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- W304295492 title "Biosynthesis of the first component of complement by human fibroblasts" @default.
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- W304295492 doi "https://doi.org/10.1042/bj1670647" @default.
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