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The Journal of Immunology, Vol 147, Issue 1 8-13, Copyright © 1991 by American Association of Immunologists
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H Gascan, JF Gauchat, G Aversa, P Van Vlasselaer and JE de Vries
DNAX Research Institute of Molecular and Cellular Biology, Palo Alto, CA 94304-1104.
IL-4 induces IgE and IgG4 synthesis, but in addition to IL-4, a second signal provided by CD4+ T cells is required. Here we demonstrate that the signal provided by CD4+ T cells can be replaced by anti-CD40 mAb. Highly purified surface (sIgM+) human B cells cultured with soluble anti-CD40 mAb in the presence of IL-4 produced IgM, total IgG, IgG4, and relatively high levels of IgE, indicating that production of these isotypes represented H chain switching and was not the result of a selective outgrowth of isotype committed B cells. No IgA was produced in these cultures. However, the T cell signal was different from the signal provided by anti-CD40 mAb, because in contrast to CD4+ T cells, anti-CD40 mAb failed to induce germ-line epsilon transcripts. However, anti-CD40 mAb strongly enhanced germ-line epsilon mRNA expression induced by IL-4. In addition, IFN-gamma, IFN-alpha, and anti-CD23 mAb, which block IL-4-induced IgE production by PBMC, or B cells cocultured with CD4+ T cell clones, failed to inhibit IgG4 and IgE synthesis induced by anti-CD40 mAb. Finally, anti-CD40 mAb and CD4+ T cell clones had strong synergistic effects on IgG4 and IgE synthesis. These results indicate that different B cell activation pathways can result in IgG4 and IgE switching in the presence of IL-4.
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