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Induction of complement factor B activity in human fibroblasts by IL-6/IFN-beta 2 and IFN-gamma.

Human skin fibroblasts synthesize and secrete complement Factor B, a component of the complement alternative pathway, when stimulated by mediators of inflammation such as lipopolysaccharide and various cytokines. Recombinant IL-6/IFN-beta 2 (E. coli) stimulates Factor B synthesis in fibroblasts but the effect is strongly potentiated by the addition of IFN-gamma. When both cytokines are added, the skin fibroblasts secrete significant amounts of biologically active Factor B detectable in a hemolysis test. This cooperative effect of IL-6, which is made by most tissue cells and monocytes and of IFN-gamma which is made by T-lymphocytes may play a role in local inflammatory processes. IL-6 and IFN-gamma also cooperate in the induction of (2'-5') A synthetase, a mediator of IFN action.