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- Title
Geomagnetic Shielding Enhances Radiation Resistance by Promoting DNA Repair Process in Human Bronchial Epithelial Cells.
- Authors
Xue, Xunwen; Ali, Yasser F.; Liu, Caorui; Hong, Zhiqiang; Luo, Wanrong; Nie, Jing; Li, Bingyan; Jiao, Yang; Liu, Ning-Ang
- Abstract
With the advent of long-duration space explorations, ionizing radiation (IR) may pose a constant threat to astronauts without the protection of Earth's magnetic field, or hypomagnetic field (HMF). However, the potential biological effects of a HMF on the cellular response to IR have not been well characterized so far. In this study, immortalized human bronchial epithelial cells were exposed to X-rays under either a geomagnetic field (GMF, ~50 uT) or HMF (<50 nT) culture condition. A significant increase of the cell survival rate in HMF after radiation was observed by colony formation analysis. The kinetics of DNA double-strand breaks (DSBs), determined by γH2AX foci formation and disappearance, presented a faster decrease of foci-positive cells and a significantly lower mean number of γH2AX foci per nucleus in HMF-cultured cells than in GMF-cultured cells after radiation. In addition, a γH2AX/53BP1 colocalization assay showed an upregulated DSB recovery rate in HMF cultured cells. These findings provided the first evidence that HMF exposure may enhance the cellular DSB repair efficiency upon radiation, and consequently modulate the genotoxic effects of IR.
- Subjects
EPITHELIAL cells; IONIZING radiation; DOUBLE-strand DNA breaks; RADIATION shielding; SURVIVAL analysis (Biometry); GEOMAGNETISM; DNA repair
- Publication
International Journal of Molecular Sciences, 2020, Vol 21, Issue 23, p9304
- ISSN
1661-6596
- Publication type
Article
- DOI
10.3390/ijms21239304