[Effect of the C1q subcomponent of complement on thrombocyte adhesion and spreading]

In vitro experiments have shown that C1q at a concentration of 8-250 mkg/ml produced a 1.5-2-fold increase in platelet adhesion to glass. Low doses (4-60 mkg/ml) enhanced platelet splitting 2-3-fold. C1q did not cause platelet aggregation or change ADP-, adrenalin- and thrombin-induced aggregation. C1q participation in the induction of immune response is suggested.