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The Journal of Immunology, Vol 141, Issue 4 1218-1224, Copyright © 1988 by American Association of Immunologists
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J Pene, F Rousset, F Briere, I Chretien, X Paliard, J Banchereau, H Spits and JE De Vries
UNICET, Laboratories for Immunological Research, Dardilly, France.
Seven T cell clones were established from mixed leukocyte cultures in which PBMC from two healthy donors and from one patient suffering from the hyper-IgE syndrome were stimulated by the irradiated EBV- transformed B cell lines JY or UD53. Five of seven T cell clones, after activation by co-cultivation with JY or UD53 cells, induced a low degree of IgE production by normal blood B cells. In one experiment in which the normal B cells could activate the T cell clones directly, IgE production was also observed in the absence of the specific stimulator cells. IgE production was also obtained with supernatants of the T cell clones collected 4 to 5 days after activation by their specific stimulator cells. In addition, the supernatants induced IgG, IgA, and IgM synthesis. All seven clones produced variable concentrations of IL- 4 and IFN-gamma. The clones FA-28 and BG-39, which failed to induce IgE synthesis, produced, compared with the other clones tested, relatively high quantities of IFN-gamma (4700 and 2500 pg/ml, respectively). These high levels of IFN-gamma accounted for the lack of induction of IgE synthesis, because in the presence of a polyclonal anti-IFN-gamma antiserum, supernatants of FA-10 and BG-39 induced significant IgE production. In addition, the low degree of IgE production induced by supernatants of two other T cell clones (FA28 and BG24) was 15- and 3- fold enhanced, respectively, in the presence of the anti-IFN-gamma antiserum. IgE synthesis by normal B cells was also induced by rIL-4, indicating that IL-4 present in T cell clone supernatants was responsible for induction of IgE production. This notion was supported by the finding that IgE production induced by supernatant of BG-24 was strongly inhibited by a polyclonal anti-IL-4 antiserum. In contrast, IgG and IgA production induced by supernatant of BG-24 were not significantly affected by the anti-IL-4 antiserum. Only a slight inhibition of IgM synthesis was observed. Collectively, our results indicate that both recombinant and naturally produced IL-4 induce normal human B cells to synthesize IgE. However, final IgE production induced by T cell clone supernatants is the net result of the inducing and suppressive effects of IL-4 and IFN-gamma respectively, that are secreted simultaneously by the T cell clones upon activation.
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