title: Preparation of trinitrophenylated red cells for antibody independent lysis by complement.
abstract: Based on the earlier observation that DNP-HSA interacts directly with C1q, a subcomponent of the first component of complement (Loos and König, 1977), evidence is presented that TNP bound to erythrocytes (E-TNP) can interact with the whole complement sequence leading to the lysis of the TNP-carrying erythrocytes; in this test system the erythrocytes are used as an indicator of the TNP-complement reaction. To exclude any antibody-mediated lysis either the heterologus sera were exhaustively absorbed with the erythrocytes used in the test system or serum and erythrocytes of one individual person were taken. The strongly temperature-dependent interaction of TNP-sulfonic acid with the erythrocytes resulted in the formation of E-TNP as well as of a TNP-protein complex released into the supernatant. The TNP-protein complex strongly inhibited purified C1 similar to DNP-HSA. The antibody independent lysis of E-TNP by complement was dependent upon the TNP concentration per cell, the temperature and time as well as the complement concentration. The reaction of E-TNP with complement showed similar characteristics to those for the reaction of antibody sensitized erythrocytes (EA) with complement. E-TNP is a helpful tool to study antibody-independent activation of the complement system.
mesh_terms: D000818:Animals; D000920:Antibody-Dependent Cell Cytotoxicity; D001665:Binding Sites; D003165:Complement System Proteins; D004912:Erythrocytes / Q000276:immunology*; D006168:Guinea Pigs; D006801:Humans; D007700:Kinetics; D009578:Nitrobenzenes / Q000276:immunology*; D012756:Sheep; D013451:Sulfonic Acids / Q000494:pharmacology; D013696:Temperature; D013997:Time Factors; D014301:Trinitrobenzenes / Q000276:immunology*
chemical_list: D009578:Nitrobenzenes; D013451:Sulfonic Acids; D014301:Trinitrobenzenes; D003165:Complement System Proteins