Cited by 151Cancer-related Molecular PathwaysEffects of Radiation ExposureDNA Repair Mechanisms

Irradiation selects for p53-deficient hematopoietic progenitors.

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Marusyk, Andriy, Porter, Christopher C., Zaberezhnyy, Vadym, DeGregori, James·2010·PLoS Biology

Abstract

Identification and characterization of mutations that drive cancer evolution constitute a major focus of cancer research. Consequently, dominant paradigms attribute the tumorigenic effects of carcinogens in general and ionizing radiation in particular to their direct mutagenic action on genetic loci encoding oncogenes and tumor suppressor genes. However, the effects of irradiation are not limited to genetic loci that encode oncogenes and tumor suppressors, as irradiation induces a multitude of other changes both in the cells and their microenvironment which could potentially affect the selective effects of some oncogenic mutations. P53 is a key tumor suppressor, the loss of which can provide resistance to multiple genotoxic stimuli, including irradiation. Given that p53 null animals develop T-cell lymphomas with high penetrance and that irradiation dramatically accelerates lymphoma development in p53 heterozygous mice, we hypothesized that increased selection for p53-deficient cells contributes to the causal link between irradiation and induction of lymphoid malignancies. We sought to determine whether ionizing irradiation selects for p53-deficient hematopoietic progenitors in vivo using mouse models. We found that p53 disruption does not provide a clear selective advantage within an unstressed hematopoietic system or in previously irradiated BM allowed to recover from irradiation. In contrast, upon irradiation p53 disruption confers a dramatic selective advantage, leading to long-term expansion of p53-deficient clones and to increased lymphoma development. Selection for cells with disrupted p53 appears to be attributable to several factors: protection from acute irradiation-induced ablation of progenitor cells, prevention of irradiation-induced loss of clonogenic capacity for stem and progenitor cells, improved long-term maintenance of progenitor cell fitness, and the disabling/elimination of competing p53 wild-type progenitors. These studies indicate that the carcinogenic effect of ionizing irradiation can in part be explained by increased selection for cells with p53 disruption, which protects progenitor cells both from immediate elimination and from long-term reductions in fitness following irradiation.

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  1. [35]Lodish H Berk A Kaiser C Krieger M Scott M 2008 Molecular cell biology (Chapter 25). New York W. H. Freeman and Company

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Authors
Marusyk, A., Porter, C. C., Zaberezhnyy, V., & DeGregori, J.
Affiliations
University of Colorado Anschutz (US)
Corresponding author
DeGregori, James
Venue
PLoS Biology
Published
2010-03-02
Volume
8
Issue
3
Pages
e1000324
ISSN
  • 1544-9173 (ISSN-L)
  • 1545-7885
OpenAlex
W2000738792
Cited by
151
References
51
Citations by year
2026: 6 · 2025: 6 · 2024: 8 · 2023: 7 · 2022: 9 · 2021: 10 · 2020: 6 · 2019: 8 · 2018: 4 · 2017: 11 · 2016: 18 · 2015: 9 · 2014: 11 · 2013: 11 · 2012: 6
FWCI
6.00
Type
journal article
Language
en
Open access
Locations
  • PLoS Biology (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion)
  • Figshare (submittedVersion, cc-by)
Funders
  • National Institutes of Health
  • National Cancer Institute (2 P30 CA46934, R01CA109657, T32CA082086, K12CA086913, P30CA046934)
Topics
  • Health Sciences › Medicine › Oncology › Cancer-related Molecular Pathways
  • Health Sciences › Medicine › Radiology, Nuclear Medicine and Imaging › Effects of Radiation Exposure
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › DNA Repair Mechanisms
Keywords
p53, ionizing radiation, hematopoietic progenitor cells, clonal selection, radiation-induced lymphoma, T-cell lymphoma, tumor suppressor, clonogenicity, radioresistance (biology), bone marrow, carcinogenesis
MeSH terms
Animals, Cells, Cultured, DNA Damage, Hematopoietic Stem Cells, Lymphoma, Mice, Inbred BALB C, Mutation, Radiation, Ionizing, Recombinant Fusion Proteins, Biomarkers, Bone Marrow Transplantation, Genes, p53, Tumor Suppressor Protein p53, Mice, Knockout, Hematopoietic Stem Cell Transplantation, Mice

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