title: [Role of C1 subcomponents in platelet aggregation induced by aggregated IgG].
abstract: Studies have been performed with platelets using C1 haemolytic assays and platelet aggregation induced by anti-C1q, anti-C1s and aggregated IgG in the presence of C1 subcomponents C1q, C1r and C1s. C1q was removed by EDTA or modified by collagenase from human platelets while after the same treatment C1s remained bound to the platelets. EDTA-treated platelets were no longer aggregated by aggregated IgG. The addition of C1q restored the reactivity of the platelets to aggregated IgG while the addition of C1s or C1s was without effect. Furthermore, the addition of C1r or C1s to C1q inhibited the action of C1q in platelet aggregation induced by IgG. The possible association between the different C1 subcomponents and human platelets is discussed.
mesh_terms: D003172:Complement C1 / Q000502:physiology*; D003165:Complement System Proteins / Q000502:physiology*; D006461:Hemolysis; D006801:Humans; D007074:Immunoglobulin G / Q000378:metabolism*; D010974:Platelet Aggregation
chemical_list: D003172:Complement C1; D007074:Immunoglobulin G; D003165:Complement System Proteins
vernacular_title: Role des sous-composants du premier composant du complément dans l'agrégation plaquetaire induite par les immunoglobulines agrées