Increased γ-H2AX by exposure to a 60-Hz magnetic fields combined with ionizing radiation, but not hydrogen peroxide, in non-tumorigenic human cell lines

2014 ◽  
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Jae Seon Lee ◽  
Sung Ho Myung ◽  
Yun-Sil Lee
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Zhong-Ming Shi ◽  
Yiao-Feng Zhang ◽  
Welton A. McCready ◽  
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Wendy Pogozelski

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Boo Ahn Shin ◽  
Kyu Youn Ahn ◽  
Bong Kyu Choi ◽  
...  

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ABSTRACTFormaldehyde is a ubiquitous DNA damaging agent, with human exposures occuring from both exogenous and endogenous sources. Formaldehyde can also form DNA-protein crosslinks and is representative of other such DNA damaging agents including ionizing radiation, metals, aldehydes, chemotherapeutics, and cigarette smoke. In order to identify genetic determinants of cell proliferation in response to continuous formaldehyde exposure, we quantified cell proliferation after siRNA-depletion of a comprehensive array of over 300 genes representing all of the major DNA damage response pathways. Three unrelated human cell lines (SW480, U-2 OS and GM00639) were used to identify common or cell line-specific mechanisms. Four cellular pathways were determined to mitigate formaldehyde toxicity in all three cell lines: homologous recombination, double-strand break repair, ionizing radiation response, and DNA replication. Differences between cell lines were further investigated by using exome sequencing and Cancer Cell Line Encyclopedia genomic data. Our results reveal major genetic determinants of formaldehyde toxicity in human cells and provide evidence for the conservation of these formaldehyde responses between human and budding yeast.


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