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The first complement component C1s formed large aggregates with bFGF when bFGF and C1s were incubated at 37 degrees C overnight. Under non-reducing conditions, a part of the aggregates did not penetrate into 5% polyacrylamide gel in the presence of SDS, and the rest penetrated into 5% gel but not into 12% gel. The aggregates were dissociated into monomers by reducing with 2-mercaptoethanol. Both active and inactive C1s formed aggregates with bFGF. In addition, a portion of bFGF was degraded by active C1s but not by inactive C1s. Aggregates were not formed when 2-mercaptoethanol (2 mM) was added to the incubation mixture. After the incubation with C1s the growth-stimulating activity of bFGF was measured by using human umbilical vein endothelial cells (HUVEC) as indicator cells. The aggregate formation between C1s and bFGF significantly reduced the activity of bFGF.
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