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Tumor Necrosis Factor–Related Apoptosis-Inducing Ligand–Mediated Proliferation of Tumor Cells with Receptor-Proximal Apoptosis Defects

¹ Research Center Kubus and ² Department of Oncology, Dr. von Haunersches Kinderspital, Munich, Germany; and ³ University Clinic and Policlinic for Children and Adolescents, Department of Oncology, Ulm, Germany

Requests for reprints: Irmela Jeremias, Forschungszentrum Kubus, Dr. von Haunersches Kinderspital, Lindwurmstr 4, 80337 Munich, Germany. Phone: 49-89-5160-7781; Fax: 49-89-5160-7753; E-mail: I.Jeremias{at}lrz.uni-muenchen.de.

Tumor necrosis factor–related apoptosis-inducing ligand (TRAIL) might represent a future cytotoxic drug to treat cancer as it induces apoptosis in tumor cells without toxicity in animal trials. We recently described that in contrast to apoptosis, TRAIL mediates tumor cell survival and proliferation in certain tumor cells. Here we studied the effect of TRAIL on 18 cell lines and 53 primary leukemia cells and classified these tumor cells into four groups: TRAIL, anti-DR4 or anti-DR5 induced apoptosis in group A cells, whereas they had no effect on group 0 cells and mediated proliferation in group P cells. To our surprise, TRAIL induced simultaneous apoptosis and proliferation in group AP cells. More than 20% of all cells tested belonged to group P and showed TRAIL-mediated proliferation even in the presence of certain cytotoxic drugs but not inhibitors of nuclear factor-B. Transfection with B-cell leukemia/lymphoma protein 2 transformed group A cells into group 0 cells, whereas transfection with Fas-associated polypeptide with death domain (FADD)–like interleukin-1-converting enzyme–inhibitory protein (FLIP) transformed them into group AP cells. Loss of caspase-8 or transfection of dominant-negative FADD transformed group A cells into group P cells. Taken together, our data suggest that proliferation is a frequent effect of TRAIL on tumor cells, which is related to receptor-proximal apoptosis defects at the level of the death-inducing signaling complex and should be prevented during antitumor therapy with TRAIL.

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