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The Journal of Immunology, Vol 144, Issue 12 4571-4578, Copyright © 1990 by American Association of Immunologists
ARTICLES |
K Tsujimura, YH Park, M Miyama-Inaba, T Meguro, T Ohno, M Ueda and T Masuda
Department of Immunobiology, Faculty of Medicine, Kyoto University, Japan.
Distribution of FcR II, FcRIII, and FcR alpha on murine splenic B cells was examined by using FITC-labeled heat-aggregated IgG of each subclass and IgA. Almost 60 to 80% of B cells expressed both FcRII and FcRIII. However, FcR alpha was expressed on only a small proportion (6%) of B cells that co-expressed FcRII. By inhibition assays with the use of cold IgG of each subclass and IgA in addition to anti-FcRII mAb (2.4G2), it was found that IgG1, IgG2a, and IgG2b utilized the same receptor (FcRII), whereas IgG3 and IgA bound only to their unique receptors, FcRIII and FcR alpha, respectively. Immune complexes IC prepared by IgG1, IgG2a, IgG2b, and IgA anti-TNP mAb with TNP-coupled SRBC inhibited the polyclonal Ig secretion and proliferative responses of B cells stimulated with either IL-4 or LPS. The inhibition of B cell activation was associated with the blockade of the membrane depolarization. Moreover, IC prepared by these antibodies caused production of suppressive B cell factor (SBF) as is the case with rabbit IgG antibody to SRBC, and SBF thus prepared regulated antibody responses in an isotype-nonspecific manner. In contrast, no inhibition for these responses or production of SBF was attained by the IC of IgG3 antibody. We concluded that FcRII and FcR alpha mediates a suppressive signal for B cells by acting on the initial step of activation, whereas FcRIII lacks this activity.
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