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Lack of Genomic Instability in Bone Marrow Cells of SCID Mice Exposed Whole-Body to Low-Dose Radiation

Journal Article · · International Journal of Environmental Research and Public Health
 [1];  [2];  [3];  [4]
  1. Stony Brook Univ., NY (United States). Pathology Dept.; DOE/OSTI
  2. Chiang Mai Univ. (Thailand). Center for Excellence for Molecular Imaging. Faculty of Associated Medical Sciences. Dept. of Radiologic Technology
  3. Stony Brook Univ., NY (United States). Pathology Dept.
  4. Texas A & M Univ. at Galveston, TX (United States). Galveston National Lab. Inst. of Human Infections and Immunology

It is clear that high-dose radiation is harmful. However, despite extensive research, assessment of potential health-risks associated with exposure to low-dose radiation (at doses below or equal to 0.1 Gy) is still challenging. Recently, we reported that 0.05 Gy of 137Cs gamma rays (the existing limit for radiation-exposure in the workplace) was incapable of inducing significant in vivo genomic instability (measured by the presence of late-occurring chromosomal damage at 6 months post-irradiation) in bone marrow (BM) cells of two mouse strains, one with constitutively high and one with intermediate levels of the repair enzyme DNA-dependent protein-kinase catalytic-subunit (DNA-PKcs). In this study, we present evidence for a lack of genomic instability in BM cells of the severely combined-immunodeficiency (SCID/J) mouse (which has an extremely low-level of DNA-PKcs activity) exposed whole-body to low-dose radiation (0.05 Gy). Together with our previous report, the data indicate that low-dose radiation (0.05 Gy) is incapable of inducing genomic instability in vivo (regardless of the levels of DNA-PKcs activity of the exposed mice), yet higher doses of radiation (0.1 and 1 Gy) do induce genomic instability in mice with intermediate and extremely low-levels of DNA-PKcs activity (indicating an important role of DNA-PKcs in DNA repair).

Research Organization:
State Univ. of New York (SUNY), Albany, NY (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
FG02-02ER63311
OSTI ID:
1628327
Journal Information:
International Journal of Environmental Research and Public Health, Journal Name: International Journal of Environmental Research and Public Health Journal Issue: 4 Vol. 10; ISSN IJERGQ; ISSN 1660-4601
Publisher:
MDPICopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (4)

The Lowest Radiation Dose Having Molecular Changes in the Living Body journal April 2018
Late Effects of Low-Dose Radiation on the Bone Marrow, Lung, and Testis Collected From the Same Exposed BALB/cJ Mice journal October 2018
Response to Baverstock, K. Comments on Rithidech, K.N.; et al. Lack of Genomic Instability in Bone Marrow Cells of SCID Mice Exposed Whole-Body to Low-Dose Radiation. Int. J. Environ. Res. Public Health 2013, 10, 1356–1377.
  • Rithidech, Kanokporn; Udomtanakunchai, Chatchanok; Honikel, Louise
  • International Journal of Environmental Research and Public Health, Vol. 10, Issue 7 https://doi.org/10.3390/ijerph10072735
journal July 2013
Ionizing radiation does not impair the mechanisms controlling genetic stability during T cell receptor gene rearrangement in mice journal February 2018

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