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The Journal of Immunology, Vol 157, Issue 10 4309-4315, Copyright © 1996 by American Association of Immunologists
ARTICLES |
S Fournel, L Genestier, E Robinet, M Flacher and JP Revillard
INSERM Unit 80 University Claude Bernard, Hospital E. Herriot, Lyon, France.
The interaction between Fas ligand and Fas, both expressed on activated T cells, is the major pathway in the regulation of activation-induced cell death. However, activated T cells that express membrane Fas are initially resistant to anti-Fas-induced apoptosis and become susceptible only after proliferation in vitro. Since IL-2 is known to regulate activation-induced cell death, we studied the effect of IL-2 on anti-Fas-mediated apoptosis. Interference with the IL-2 pathway was achieved by 1) inhibition of cytokine synthesis using cyclosporin A or FK506, 2) neutralization of IL-2 by anti-IL-2 Ab, 3) inhibition of binding to IL-2R by CD25 mAb, and 4) blocking of IL-2R signaling by rapamycin. We show that Fas expression is independent of the IL-2 pathway, whereas Fas-mediated apoptosis does not develop in the presence of inhibitors of IL-2 production or signaling. While the addition of rIL-2 reversed the inhibitory effect of cyclosporin A and FK506, the addition of rIL-4, rIL-7, or rIFN-gamma did not, although these cytokines induced progression into the S phase of the cell cycle. Aphidicolin-treated activated T cells that do not progress into the S phase were susceptible to Fas-mediated apoptosis. Therefore, Fas- mediated apoptosis is controlled by signals generated by IL-2 in agreement with the reported alteration of apoptosis in mice deficient in IL-2 or IL-2R.
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