Abstract |
Radiotherapy is essential to the treatment of most solid tumors and acquired or innate resistance to this therapeutic modality is a major clinical problem. Here we show that miR-139-5p is a potent modulator of radiotherapy response in breast cancer via its regulation of genes involved in multiple DNA repair and reactive oxygen species defense pathways. Treatment of breast cancer cells with a miR-139-5p mimic strongly synergized with radiation both in vitro and in vivo, resulting in significantly increased oxidative stress, accumulation of unrepaired DNA damage, and induction of apoptosis. Several miR-139-5p target genes were also strongly predictive of outcome in radiotherapy-treated patients across multiple independent breast cancer cohorts. These prognostically relevant miR-139-5p target genes were used as companion biomarkers to identify radioresistant breast cancer xenografts highly amenable to sensitization by cotreatment with a miR-139-5p mimetic.Significance: The microRNA described in this study offers a potentially useful predictive biomarker of radiosensitivity in solid tumors and a generally applicable druggable target for tumor radiosensitization. Cancer Res; 78(2); 501-15. ©2017 AACR.
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Authors | Marina Pajic, Danielle Froio, Sheridan Daly, Louise Doculara, Ewan Millar, Peter H Graham, Alison Drury, Angela Steinmann, Charles E de Bock, Alice Boulghourjian, Anaiis Zaratzian, Susan Carroll, Joanne Toohey, Sandra A O'Toole, Adrian L Harris, Francesca M Buffa, Harriet E Gee, Georgina E Hollway, Timothy J Molloy |
Journal | Cancer research
(Cancer Res)
Vol. 78
Issue 2
Pg. 501-515
(01 15 2018)
ISSN: 1538-7445 [Electronic] United States |
PMID | 29180477
(Publication Type: Journal Article, Research Support, Non-U.S. Gov't)
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Copyright | ©2017 American Association for Cancer Research. |
Chemical References |
- Biomarkers, Tumor
- MIRN139 microRNA, human
- MicroRNAs
- Reactive Oxygen Species
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Topics |
- Animals
- Apoptosis
- Biomarkers, Tumor
(genetics)
- Breast Neoplasms
(genetics, pathology, radiotherapy)
- Case-Control Studies
- Cell Proliferation
- DNA Damage
(radiation effects)
- DNA Repair
(radiation effects)
- Female
- Follow-Up Studies
- Gene Expression Profiling
- Gene Expression Regulation, Neoplastic
(radiation effects)
- Gene Regulatory Networks
(radiation effects)
- Humans
- Mice
- Mice, Inbred BALB C
- Mice, Nude
- MicroRNAs
(genetics)
- Neoplasm Recurrence, Local
(genetics, pathology, radiotherapy)
- Prognosis
- Radiation Tolerance
(genetics)
- Reactive Oxygen Species
(metabolism)
- Survival Rate
- Tumor Cells, Cultured
- Xenograft Model Antitumor Assays
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