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The Journal of Immunology, Vol 144, Issue 5 1817-1822, Copyright © 1990 by American Association of Immunologists

ARTICLES

The monoclonal antibody 41H16 detects the Leu 4 responder form of human Fc gamma RII

EJ Gosselin, MF Brown, CL Anderson, TF Zipf and PM Guyre
Department of Physiology, Dartmouth Medical School, Hanover, NH 03756.

Human FcR for IgG can be divided into three classes (Fc gamma RI, II, and III) based on their structure and reactivity with mAb. Fc gamma RII can be further subdivided into two categories based on functional and biochemical assays. These two Fc gamma RII subtypes were initially recognized by the failure of T cells from 40% of individuals to proliferate in response to mAb Leu 4 (mouse IgG1, anti-CD3), a response that requires the binding of the Fc region of the Leu 4 mAb to Fc gamma RII on monocyte accessory cells. Inas-much as mouse IgG1, does not bind efficiently to the nonresponder form of Fc gamma RII, mAb Leu 4 is unable to induce proliferation in these individuals. IEF data on Fc gamma RII from Leu 4 responder and nonresponder individuals suggested that the structural gene for Fc gamma RII consisted of two allelic forms R (responder) and N (nonresponder) producing the phenotypes RR, RN, and NN. Thus, exclusive expression of the nonresponder allele in monocytes of "nonresponder" individuals, appeared to be responsible for the lack of proliferation observed. In cooperation with the IVth International Conference on Human Leukocyte Differentiation Antigens, we analyzed CDw32 mAb to determine if they could distinguish the responder and nonresponder forms of Fc gamma RII. We report that mAb 41H16 binds preferentially to the responder allotypic form of Fc gamma RII expressed on human monocytes. When quantitative flow cytometry is used to measure the binding of both mAb 41H16 (responder Fc gamma RII) and mAb IV.3 (all myeloid cell Fc gamma RII), we are able to subdivide the responder population into homozygous and heterozygous responders. In addition, mAb 41H16 blocks the binding of mAb IV.3 to monocytes and inhibits proliferation when added to cells before addition of mAb Leu 4. We also show that polymorphonuclear leukocytes and platelets have the same allotypic differences in the binding of 41H16 as do monocytes. However, a subset of lymphocytes (previously shown to be B cells) expresses the 41H16 epitope with no evidence for donor to donor variability.


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