Abstract
Breast cancer cells are generally resistant to induction of apoptosis by treatment with tumor necrosis factor-related apoptosis-inducing ligand (TRAIL). In this study, we demonstrate that both TRAIL-sensitive and TRAIL-resistant breast cancer cell lines can be efficiently killed by overexpression of the TRAIL receptor, death receptor 4 (DR4). The extent of cell death depended on the strength of the promoter driving DR4 expression. When driven by the strong CMV promoter, expression of DR4 killed over 90% of cells in five out of six cell lines tested in the absence of exogenous TRAIL. When driven by the relatively weak tumor-specific hTERT promoter, DR4 was less effective alone, but sensitized cells to killing by TRAIL. The extent of TRAIL sensitization depended on the magnitude of hTERT promoter activity. MCF-7 cells were relatively resistant to the action of DR4. We compared expression of the genes involved in transduction and execution of the death receptor-initiated apoptotic stimuli between MCF-7 and DR4-sensitive cell lines. We confirmed that in the panel of cell lines, MCF-7 was the only line deficient in expression of caspase 3. Bcl-2 and FLIP proteins, implicated in suppression of TRAIL-induced apoptosis, were expressed at a higher level.
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Acknowledgements
We thank Dr Satoru Kyo for kindly supplying us with the hTERT promoter constructs. This work was supported by the NIH 5 K12 CA01723-10 Physician Scientist Training Grant and an Institutional Research Grant from American Cancer Society.
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Kazhdan, I., Marciniak, R. Death receptor 4 (DR4) efficiently kills breast cancer cells irrespective of their sensitivity to tumor necrosis factor-related apoptosis-inducing ligand (TRAIL). Cancer Gene Ther 11, 691–698 (2004). https://doi.org/10.1038/sj.cgt.7700747
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DOI: https://doi.org/10.1038/sj.cgt.7700747
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