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- W3157562532 abstract "DNA double-strand break (DSB) induction and repair have been widely studied in radiation therapy (RT); however little is known about the impact of very low exposures from repeated computed tomography (CT) scans for the efficiency of repair. In our current study, DSB repair and kinetics were investigated in side-by-side comparison of RT treatment (2 Gy) with repeated diagnostic CT scans (≤20 mGy) in human breast epithelial cell lines and lymphoblastoid cells harboring different mutations in known DNA damage repair proteins. Immunocytochemical analysis of well known DSB markers γ H2AX and 53BP1, within 48 h after each treatment, revealed highly correlated numbers of foci and similar appearance/disappearance profiles. The levels of γ H2AX and 53BP1 foci after CT scans were up to 30% of those occurring 0.5 h after 2 Gy irradiation. The DNA damage repair after diagnostic CT scans was monitored and quantitatively assessed by both γ H2AX and 53BP1 foci in different cell types. Subsequent diagnostic CT scans in 6 and/or 12 weeks intervals resulted in elevated background levels of repair foci, more pronounced in cells that were prone to genomic instability due to mutations in known regulators of DNA damage response (DDR). The levels of persistent foci remained enhanced for up to 6 months. This “memory effect” may reflect a radiation-induced long-term response of cells after low-dose x-ray exposure." @default.
- W3157562532 created "2021-05-10" @default.
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- W3157562532 date "2021-04-23" @default.
- W3157562532 modified "2023-10-05" @default.
- W3157562532 title "Persistent DNA Double-Strand Breaks After Repeated Diagnostic CT Scans in Breast Epithelial Cells and Lymphocytes" @default.
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- W3157562532 doi "https://doi.org/10.3389/fonc.2021.634389" @default.
- W3157562532 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/8103218" @default.
- W3157562532 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/33968734" @default.
- W3157562532 hasPublicationYear "2021" @default.
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