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Bakhoum SF, Kabeche L, Wood MD, Laucius CD, Qu D, Laughney AM, Reynolds GE, Louie RJ, Phillips J, Chan DA, Zaki BI, Murnane JP, Petritsch C, Compton DA. Numerical chromosomal instability mediates susceptibility to radiation treatment. Nat Commun 2015; 6:5990. [PMID: 25606712 DOI: 10.1038/ncomms6990] [Citation(s) in RCA: 60] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2014] [Accepted: 12/01/2014] [Indexed: 01/05/2023] Open
Abstract
The exquisite sensitivity of mitotic cancer cells to ionizing radiation (IR) underlies an important rationale for the widely used fractionated radiation therapy. However, the mechanism for this cell cycle-dependent vulnerability is unknown. Here we show that treatment with IR leads to mitotic chromosome segregation errors in vivo and long-lasting aneuploidy in tumour-derived cell lines. These mitotic errors generate an abundance of micronuclei that predispose chromosomes to subsequent catastrophic pulverization thereby independently amplifying radiation-induced genome damage. Experimentally suppressing whole-chromosome missegregation reduces downstream chromosomal defects and significantly increases the viability of irradiated mitotic cells. Further, orthotopically transplanted human glioblastoma tumours in which chromosome missegregation rates have been reduced are rendered markedly more resistant to IR, exhibiting diminished markers of cell death in response to treatment. This work identifies a novel mitotic pathway for radiation-induced genome damage, which occurs outside of the primary nucleus and augments chromosomal breaks. This relationship between radiation treatment and whole-chromosome missegregation can be exploited to modulate therapeutic response in a clinically relevant manner.
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Affiliation(s)
- Samuel F Bakhoum
- Department of Radiation Oncology, Memorial Sloan Kettering Cancer Center, 1275 York Avenue, New York, New York 10065, USA
| | - Lilian Kabeche
- 1] Department of Biochemistry, Geisel School of Medicine at Dartmouth, Hanover, New Hampshire 03755, USA [2] Norris-Cotton Cancer Center, Geisel School of Medicine at Dartmouth, Lebanon, New Hampshire 03756, USA
| | - Matthew D Wood
- Department of Pathology, University of California San Francisco, San Francisco, California 94143, USA
| | - Christopher D Laucius
- 1] Department of Biochemistry, Geisel School of Medicine at Dartmouth, Hanover, New Hampshire 03755, USA [2] Norris-Cotton Cancer Center, Geisel School of Medicine at Dartmouth, Lebanon, New Hampshire 03756, USA
| | - Dian Qu
- 1] Department of Neurological Surgery and the Brain Tumor Research Center, University of California San Francisco, San Francisco, California 94143, USA [2] Helen Diller Comprehensive Cancer Center, University of California San Francisco, San Francisco, California 94143, USA
| | - Ashley M Laughney
- Department of Radiology, Center for Systems Biology, Massachusetts General Hospital, Harvard Medical School, Boston, Massachusetts 02114, USA
| | - Gloria E Reynolds
- Department of Radiation Oncology, University of California San Francisco, San Francisco, California 94143, USA
| | - Raymond J Louie
- Department of Radiation Oncology, University of California San Francisco, San Francisco, California 94143, USA
| | - Joanna Phillips
- 1] Department of Neurological Surgery and the Brain Tumor Research Center, University of California San Francisco, San Francisco, California 94143, USA [2] Helen Diller Comprehensive Cancer Center, University of California San Francisco, San Francisco, California 94143, USA
| | - Denise A Chan
- Department of Radiation Oncology, University of California San Francisco, San Francisco, California 94143, USA
| | - Bassem I Zaki
- Section of Radiation Oncology, Department of Medicine, Geisel School of Medicine at Dartmouth, Lebanon, New Hampshire 03756, USA
| | - John P Murnane
- Department of Radiation Oncology, University of California San Francisco, San Francisco, California 94143, USA
| | - Claudia Petritsch
- 1] Department of Neurological Surgery and the Brain Tumor Research Center, University of California San Francisco, San Francisco, California 94143, USA [2] Helen Diller Comprehensive Cancer Center, University of California San Francisco, San Francisco, California 94143, USA
| | - Duane A Compton
- 1] Department of Biochemistry, Geisel School of Medicine at Dartmouth, Hanover, New Hampshire 03755, USA [2] Norris-Cotton Cancer Center, Geisel School of Medicine at Dartmouth, Lebanon, New Hampshire 03756, USA
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