Abstract
Lung cancers with activating KRAS mutations are characterized by treatment resistance and poor prognosis. In particular, the basis for their resistance to radiation therapy is poorly understood. Here, we describe a radiation resistance phenotype conferred by a stem-like subpopulation characterized by mitosis-like condensed chromatin (MLCC), high CD133 expression, invasive potential, and tumor-initiating properties. Mechanistic investigations defined a pathway involving osteopontin and the EGFR in promoting this phenotype. Osteopontin/EGFR-dependent MLCC protected cells against radiation-induced DNA doublestrand breaks and repressed putative negative regulators of stem-like properties, such as CRMP1 and BIM. The MLCCpositive phenotype defined a subset of KRAS-mutated lung cancers that were enriched for co-occurring genomic alterations in TP53 and CDKN2A. Our results illuminate the basis for the radiation resistance of KRAS-mutated lung cancers, with possible implications for prognostic and therapeutic strategies.
Original language | English |
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Pages (from-to) | 2018-2028 |
Number of pages | 11 |
Journal | Cancer Research |
Volume | 77 |
Issue number | 8 |
DOIs | |
State | Published - Apr 15 2017 |
Keywords
- A549 Cells
- Animals
- Carcinoma, Non-Small-Cell Lung/genetics
- ErbB Receptors/metabolism
- Female
- Heterografts
- Humans
- Lung Neoplasms/genetics
- Male
- Mice
- Mice, Nude
- Mutation
- Neoplastic Stem Cells/metabolism
- Osteopontin/biosynthesis
- Proto-Oncogene Proteins p21(ras)/genetics
- Radiation Tolerance/genetics
- Signal Transduction