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. 1992 Feb;75(2):336–342.

Human monocyte-mediated cytotoxicity towards erythrocytes induced by hybrid mouse monoclonal antibodies: effect of antibody binding valency on IgG-Fc gamma R interaction.

P Koolwijk 1, J G Van de Winkel 1, I Otten 1, B J Bast 1
PMCID: PMC1384716  PMID: 1532380

Abstract

In this study, we describe the ability of hybrid mouse monoclonal antibody (mAb) to induce monocyte-mediated cytotoxicity towards human IgA1-coated E (HuIgA1-E), and the effect of mAb binding valency on Fc gamma RI-mediated ADCC. All hybrid monospecific (ms) anti-HuIgA1 and bispecific (bs) anti-HuIgA1/HRP mAb were capable of inducing monocyte-mediated lysis of HuIgA1-E, in spite of differences in mAb densities essential for optimal lysis. The cytotoxicity induced by hybrid mAb which consist of one or more mIgG2a H chains was predominantly mediated via Fc gamma RI, as shown by inhibition studies on monocytes with Fc gamma RI-blocking mAb TB-3 (approximately 80% inhibition). However, partial inhibition of mIgG1-2a and mIgG2a-2b-induced cytotoxicity (20-50%) was observed by using Fc gamma RII-blocking mAb IV.3 or CIKM5. For hybrid mIgG1-1 mAb the opposite was true; the cytotoxicity was predominantly mediated via Fc gamma RII (70-80%) and less via Fc gamma RI (20-30%). Comparing the hybrid ms anti-HuIgA1 mAb-induced cytotoxicity with the cytotoxicity induced by hybrid bs anti-HuIgA1/HRP mAb of the same isotype, we observed a decrease in cytotoxicity towards HuIgA1-E sensitized with univalently bound bs anti-HuIgA1/HRP mAb. This decrease was only found for Fc gamma RI-mediated ADCC (mIgG2a-2a, mIgG1-2a and mIgG2a-2b). This diminished recognition of univalently bound IgG relative to bivalently bound IgG by Fc gamma RI was also observed with U937 effector cells. In conclusion, this work shows that hybrid mAb are able to induce monocyte-mediated cytotoxicity towards E-HuIgA1 and that there appears to be an effect of Ag-IgG binding valency on Fc gamma RI-mediated cytotoxicity.

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Selected References

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