Abstract
TNF-related apoptosis-inducing ligand (TRAIL), a promising novel anti-cancer cytokine of the TNF superfamily, and Bortezomib, the first-in-class clinically used proteasome inhibitor, alone or in combination have been shown to efficiently kill numerous tumor cell lines. However, data concerning primary human tumor cells are very rare. Using primary esthesioneuroblastoma cells we analyzed the anti-tumor potential and the mechanism employed by Bortezomib in combination with TRAIL for the treatment of this rare but aggressive tumor. Expression of components of the TRAIL pathway was analyzed in tumor specimens and isolated primary tumor cells at the protein level. Cells were treated with TRAIL, Bortezomib, and a combination thereof, and apoptosis induction was quantified. Clonogenicity assays were performed to elucidate the long-term effect of this treatment. Despite expressing all components of the TRAIL pathway, freshly isolated primary esthesioneuroblastoma cells were completely resistant to TRAIL-induced apoptosis. They could, however, be very efficiently sensitized by subtoxic doses of Bortezomib. The influence of Bortezomib on the TRAIL pathway was analyzed and showed upregulation of TRAIL death receptor expression, enhancement of the TRAIL death-inducing signaling complex (DISC), and downregulation of anti-apoptotic proteins of the TRAIL pathway. Of clinical relevance, TRAIL-resistant primary tumor cells could be repeatedly sensitized by Bortezomib, providing the basis for repeated clinical application schedules. This is the first report on the highly synergistic induction of apoptosis in primary esthesioneuroblastoma cells by Bortezomib and TRAIL. This combination, therefore, represents a promising novel therapeutic option for esthesioneuroblastoma.
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Abbreviations
- DISC:
-
Death inducing signaling complex
- FACS:
-
Fluorescence activated cell sorting
- FSC/SSC:
-
Forward scatter/side scatter
- HRP:
-
Horseradish peroxidase
- iz-TRAIL:
-
Isoleucine Zipper TRAIL
- MTT:
-
3-(4,5-Dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide
- OPG:
-
Osteoprotegerin
- PE:
-
ß-Phycoerythrin
- PI:
-
Propidium iodide
- RSB:
-
Reducing sample buffer
- siRNA:
-
Short interfering RNA
- TRAIL:
-
TNF-related apoptosis-inducing ligand
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Acknowledgments
The authors like to thank Bärbel Moos, Jutta Mohr, and Rainer Baran-Schmidt for excellent technical assistance, and Tobias Paffhausen (Department of Tumour Genetics, German Cancer Research Center, Heidelberg) for the anti-N-myc antibody and control lysates. We like to thank Dr. Christian Hartmann (Institute of Neuropathology, University of Heidelberg) for providing paraffin-embedded tumor material of esthesioneuroblastoma patients 572/98 and 804/03 and Prof. Dr. Hartmut Arps (Hospital Fulda, Fulda) for providing paraffin-embedded tumor material of patient #2. Ronald Koschny was supported by the Deutsche Forschungsgemeinschaft (DFG). The work was funded by the Tumorzentrum HD/MA (T. M. Ganten und H. Walczak) and the Deutsche Krebshilfe (H. Walczak).
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Koschny, R., Holland, H., Sykora, J. et al. Bortezomib sensitizes primary human esthesioneuroblastoma cells to TRAIL-induced apoptosis. J Neurooncol 97, 171–185 (2010). https://doi.org/10.1007/s11060-009-0010-6
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DOI: https://doi.org/10.1007/s11060-009-0010-6