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Immunology. Dec 1979; 38(4): 687–695.
PMCID: PMC1457877

Activation of mouse complement by different classes of mouse antibody.

Abstract

The capacity of mouse IgM, IgGl, IgG2 and IgA anti-dinitrophenyl (DNP) antibodies to activate mouse or guinea-pig complement was studied, using a sensitive haemolytic assay and two-dimensional immunoelectrophoresis to detect cleavage of mouse C3. Three monoclonal IgM antibodies, and a heterogeneous IgM fraction, lysed trinitrophenylated erythrocytes in the presence of guinea-pig C, but failed to produce lysis in the presence of mouse C. and only activated mouse C3 very inefficiently. A monoclonal IgGl antibody did not produce haemolysis in the presence of guinea-pig or mouse C, but cleaved mouse C3 via the alternative pathway. Two IgA myeloma proteins (M315 and M460) had similar properties. A heterogeneous IgG2 antibody fraction produced haemolysis in the presence of both mouse and guinea-pig C, and was shown to activate both the classical and alternative pathways of mouse C.

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Selected References

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