Abstract
Tumor necrosis factor-related apoptosis-inducing ligand (TRAIL) is a potent endogenous activator of the cell death pathway and functions by activating the cell surface death receptors 4 and 5 (DR4 and DR5). TRAIL is nontoxicin vivoand preferentially kills neoplastically transformed cells over normal cells by an undefined mechanism. Radiotherapy is a common treatment for breast cancer as well as many other cancers. Here we demonstrate that ionizing radiation can sensitize breast carcinoma cells to TRAIL-induced apoptosis. This synergistic effect is p53-dependent and may be the result of radiation-induced up-regulation of the TRAIL-receptor DR5. Importantly, TRAIL and ionizing radiation have a synergistic effect in the regression of established breast cancer xenografts. Changes in tumor cellularity and extracellular space were monitoredin vivoby diffusion-weighted magnetic resonance imaging (diffusion MRI), a noninvasive technique to produce quantitative images of the apparent mobility of water within a tissue. Increased water mobility was observed in combined TRAIL- and radiation-treated tumors but not in tumors treated with TRAIL or radiation alone. Histological analysis confirmed the loss of cellularity and increased numbers of apoptotic cells in TRAIL- and radiation-treated tumors. Taken together, our results provide support for combining radiation with TRAIL to improve tumor eradication and suggest that efficacy of apoptosis-inducing cancer therapies may be monitored noninvasively, using diffusion MRI.
Bibliography
Chinnaiyan, A. M., Prasad, U., Shankar, S., Hamstra, D. A., Shanaiah, M., Chenevert, T. L., Ross, B. D., & Rehemtulla, A. (2000). Combined effect of tumor necrosis factor-related apoptosis-inducing ligand and ionizing radiation in breast cancer therapy. Proceedings of the National Academy of Sciences, 97(4), 1754â1759.
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Dates
Type | When |
---|---|
Created | 23 years, 1 month ago (July 26, 2002, 10:35 a.m.) |
Deposited | 2 years, 4 months ago (April 22, 2023, 8:14 a.m.) |
Indexed | 3 weeks, 5 days ago (Aug. 6, 2025, 9:06 a.m.) |
Issued | 25 years, 6 months ago (Feb. 4, 2000) |
Published | 25 years, 6 months ago (Feb. 4, 2000) |
Published Online | 25 years, 6 months ago (Feb. 4, 2000) |
Published Print | 25 years, 6 months ago (Feb. 15, 2000) |
@article{Chinnaiyan_2000, title={Combined effect of tumor necrosis factor-related apoptosis-inducing ligand and ionizing radiation in breast cancer therapy}, volume={97}, ISSN={1091-6490}, url={http://dx.doi.org/10.1073/pnas.030545097}, DOI={10.1073/pnas.030545097}, number={4}, journal={Proceedings of the National Academy of Sciences}, publisher={Proceedings of the National Academy of Sciences}, author={Chinnaiyan, Arul M. and Prasad, Uttara and Shankar, Sunita and Hamstra, Daniel A. and Shanaiah, Murthy and Chenevert, Thomas L. and Ross, Brian D. and Rehemtulla, Alnawaz}, year={2000}, month=feb, pages={1754–1759} }