The Journal of Experimental Medicine
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Journal of Experimental Medicine, Vol 178, 1473-1481, Copyright © 1993 by Rockefeller University Press


ARTICLES

Interleukin 10 (IL-10) upregulates functional high affinity IL-2 receptors on normal and leukemic B lymphocytes

AC Fluckiger, P Garrone, I Durand, JP Galizzi and J Banchereau
Laboratory for Immunological Research, Schering-Plough, Dardilly, France.

Interleukin 10 (IL-10) has recently been shown to induce normal human B lymphocytes to proliferate and differentiate into immunoglobulin (Ig)- secreting cells. Herein, we show that IL-10 also promotes DNA synthesis and IgM production by anti-CD40 activated B cell chronic lymphocytic leukemia (B-CLL). Most strikingly, IL-2 and IL-10 were found to synergize to induce the proliferation and differentiation of B-CLL cells. This synergy between IL-2 and IL-10 was also observed with normal B cells which proliferated strongly and secreted large amounts of IgM, IgG, and IgA. The observed synergy is likely to be due to the IL-10-induced increase of high affinity IL-2 receptors on both normal and leukemic B cells. This increase of high affinity receptor is associated to an increase of Tac/CD25 expression that can be detected by flow cytometric analysis. Taken together, these results indicate that IL-10 permits anti-CD40 activated B cells to respond to IL-2 through an induction of high affinity IL-2 receptors. This effect of IL- 10 may partly explain how T cells, which activate B cells in a CD40- dependent fashion, induce B cell proliferation and differentiation mostly through IL-2.
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