The Journal of Experimental Medicine
Janeway's Immunobiology 7th Edition
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J. Exp. Med., Volume 189, Number 8, April 19, 1999 1343-1354

Monocyte-mediated Tumoricidal Activity via the Tumor Necrosis Factor-related Cytokine, TRAIL

By Thomas S. Griffith,* Steven R. Wiley,Dagger Marek Z. Kubin,* Lisa M. Sedger,§ Charles R. Maliszewski,§ and Neil A. Fanger§

From the * Department of Immunobiology, the Dagger  Department of Bioinformatics, and the § Department of Discovery Research, Immunex Corporation, Seattle, Washington 98101

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)-gamma or -alpha 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.

Key words: TRAIL;  apoptosis;  tumor;  monocyte;  human


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