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The Journal of Immunology, Vol 144, Issue 4 1331-1337, Copyright © 1990 by American Association of Immunologists

ARTICLES

IL-4 potentiates the IL-2-dependent proliferation of mouse cytotoxic T cells

CL Miller, JW Hooton, S Gillis and V Paetkau
Department of Biochemistry, University of Alberta, Edmonton, Canada.

In addition to the regulation of B lymphocyte growth and differentiation, the cytokine IL-4 (BSF-1) exerts effects on T lymphocytes and other bone marrow-derived lineages. We show here that recombinant mouse IL-4 synergizes with low levels of IL-2 to increase the yield of cytotoxic activity in a primary MLR, and the proliferation of both cloned IL-2-dependent CTL lines and cells obtained from a primary MLR. IL-4 did not induce the proliferation of any of several cloned CTL cell lines on its own. It also did not replace IL-2 in stimulating the growth or reactivation of quiescent, antigen-dependent CTL clones. However, IL-4 was synergistic with IL-2 after reactivation of the quiescent cells with antigen plus IL-2. Enhancement by IL-4 of the IL-2-driven proliferation of an antigen-independent line was blocked by the addition of anti-IL-4 monoclonal antibody. Although incubation of the CTL clones with IL-4 or with IL-2 plus IL-4 induced a transient increase in the expression of the mRNA encoding the 55 kDa IL- 2 receptor, no change in the number or affinity of IL-2 receptors because of IL-4 was detected. This suggests that IL-4 does not potentiate the IL-2 response by altering IL-2 receptor levels. Instead, we propose that the synergistic effect of IL-4 is mediated by a different signalling mechanism from that used by IL-2.


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