Rate of Interaction of IgG1 and IgG3 Sensitized Red Cells with Monocytes in the Phagocytosis Assay |
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Authors: | Ewa Brojer A.H. Merry Phd Barbara Zupanska |
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Affiliation: | Institute of Haematology, Warsaw, Poland. |
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Abstract: | Another aspect of the preferential binding to monocytes of IgG3-coated erythrocytes over IgG1-coated erythrocytes has been demonstrated by measuring the rate of interaction in the phagocytosis assay. Erythrocytes sensitized with comparable numbers of IgG1 and IgG3 monoclonal and polyclonal anti-D antibodies were incubated with a monocyte preparation for up to 2 h. Interaction with the erythrocytes sensitized with monoclonal or polyclonal IgG3 was much more rapid than with erythrocytes sensitized with IgG1. With IgG3-sensitized erythrocytes maximum interaction was found after 30 min, whereas with IgG1-sensitized erythrocytes 2 h were required for maximum interaction. These results are consistent with the longer hinge region of IgG3 allowing bridges to be formed more easily between the negatively charged erythrocytes and monocytes. |
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Keywords: | IgG subclasses Monocytes Phagocytosis Monoclonal anti-D Anti-D Red cells Fc receptors Blood group antibodies IgG1 IgG3 |
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