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The Journal of Immunology, Vol 136, Issue 5 1641-1647, Copyright © 1986 by American Association of Immunologists

ARTICLES

Human monocytes and U937 cells bear two distinct Fc receptors for IgG

RJ Looney, GN Abraham and CL Anderson

Several convergent lines of evidence have led us to propose that human monocytes and the related cell line U937 possess a second class of IgG Fc receptor (FcR) in addition to the 72-Kd high affinity FcR previously described. IgG affinity purification from detergent lysates of surface radiolabeled U937 cells has yielded both a 40-Kd IgG-binding membrane protein (p40) and the 72-Kd FcR protein. By the same procedure, only the p40 was isolated from the erythroblast cell line K562 and from the B cell lines, Daudi and Raji. Serologic cross-reactivity between the 40- Kd FcR on U937 and Daudi cells was demonstrated using a goat anti-FcR antiserum. A murine (m) monoclonal antibody, raised against the FcR of K562 cells, precipitated the 40-Kd FcR from lysates of U937 and K562 cells but not from Daudi or Raji cells. This antibody, referred to as anti-p40 (IV.3), selectively inhibited the binding of murine IgG1- coated erythrocytes to U937 cells, whereas monomeric human IgG selectively inhibited binding of human anti-Rh(D)-coated erythrocytes to U937 cells. Both Daudi and U937 cells mediated mIgG1 anti-T3 (Leu-4)- induced stimulation of T lymphocytes. In contrast, mIgG2a anti-T3 (OKT3)-induced stimulation was supported effectively by U937 cells but only modestly by Daudi cells. Intact IgG or Fab fragments of anti-p40 (IV.3) blocked mIgG1 anti-T3 (Leu-4) stimulation but not mIgG2a anti-T3 (OKT3) stimulation of T cells; monomeric human IgG blocked only OKT3- induced stimulation. The simplest interpretation of these results is that human monocytes and U937 cells bear two classes of IgG FcR, one of 72 Kd and the other, as described above, of 40 Kd. We propose that the 72-Kd FcR mediates rosette formation with red cells coated by human anti-Rh IgG as well as T cell stimulation by mIgG2a anti-T3 (OKT3) and that the 40-Kd FcR mediates rosette formation with erythrocytes bearing mIgG1 as well as T cell stimulation by mIgG1 anti-T3 (Leu-4). Furthermore, we suggest that these two FcR are the human homologues of the murine macrophage FcRI (binding mIgG2a) and FcRII (binding mIgG2b/1).


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