The Journal of Experimental Medicine
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Journal of Experimental Medicine, Vol 181, 71-77, Copyright © 1995 by Rockefeller University Press


ARTICLES

Fas ligand mediates activation-induced cell death in human T lymphocytes

MR Alderson, TW Tough, T Davis-Smith, S Braddy, B Falk, KA Schooley, RG Goodwin, CA Smith, F Ramsdell and DH Lynch
Immunex Research and Developmental Corporation, Seattle, Washington 98101.

A significant proportion of previously activated human T cells undergo apoptosis when triggered through the CD3/T cell receptor complex, a process termed activation-induced cell death (AICD). Ligation of Fas on activated T cells by either Fas antibodies or recombinant human Fas- ligand (Fas-L) also results in cytolysis. We demonstrate that these two pathways of apoptosis are causally related. Stimulation of previously activated T cells resulted in the expression of Fas-L mRNA and lysis of Fas-positive target cells. Fas-L antagonists inhibited AICD of T cell clones and staphylococcus enterotoxin B (SEB)-specific T cell lines. The data indicate AICD in previously stimulated T cells is mediated by Fas/Fas-L interactions.
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