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J. Exp. Med.,
Volume 189, Number 8, April 19, 1999 1343-1354
By

From the * Department of Immunobiology, the TRAIL (tumor necrosis factor [TNF]-related apoptosis-inducing ligand) is a molecule that displays potent antitumor activity against selected targets. The results presented here demonstrate that human monocytes rapidly express TRAIL, but not Fas ligand or TNF, after activation
with interferon (IFN)-
Department of Bioinformatics, and the § Department of
Discovery Research, Immunex Corporation, Seattle, Washington 98101
or -
and acquire the ability to kill tumor cells. Monocyte-mediated
tumor cell apoptosis was TRAIL specific, as it could be inhibited with soluble TRAIL receptor. Moreover, IFN stimulation caused a concomitant loss of TRAIL receptor 2 expression,
which coincides with monocyte acquisition of resistance to TRAIL-mediated apoptosis. These
results define a novel mechanism of monocyte-induced cell cytotoxicity that requires TRAIL,
and suggest that TRAIL is a key effector molecule in antitumor activity in vivo.
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