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• W2405888939 abstract "Hyperthermia can transiently degrade BRCA2 and thereby inhibit the homologous recombination pathway. Induced DNA-double strand breaks (DSB) then have to be repaired via the error prone non-homologous end-joining pathway. In the present study, to investigate the role of hyperthermia in genotoxicity and radiosensitization, the induction of chromosomal aberrations was examined by premature chromosome condensation and fluorescence in situ hybridisation (PCC-FISH), and cell survival was determined by clonogenic assay shortly (0-1 h) and 24 h following exposure to hyperthermia in combination with ionizing radiation. Prior to exposure to 4 Gy γ-irradiation, confluent cultures of SW‑1573 (human lung carcinoma) and RKO (human colorectal carcinoma) cells were exposed to mild hyperthermia (1 h, 41˚C). At 1 h, the frequency of chromosomal translocations was higher following combined exposure than following exposure to irradiation alone. At 24 h, the number of translocations following combined exposure was lower than following exposure to irradiation only, and was also lower than at 1 h following combined exposure. These dynamics in translocation frequency can be explained by the hyperthermia-induced transient reduction of BRCA2 observed in both cell lines. In both cell lines exposed to radiation only, potentially lethal damage repair (PLDR) correlated with a decreased number of chromosomal fragments at 24 h compared to 1 h. With combined exposure, PLDR did not correlate with a decrease in fragments, as in the RKO cells at 24 h following combined exposure, the frequency of fragments remained at the level found after 1 h of exposure and was also significantly higher than that found following exposure to radiation alone. This was not observed in the SW‑1573 cells. Cell survival experiments demonstrated that exposure to hyperthermia radiosensitized the RKO cells, but not the SW‑1573 cells. This radiosensitization was at least partly due to the induction of apoptosis, which was only observed in the RKO cells and which may have been induced by BRCA2 degradation or different types of chromosomal aberrations. An important observation of this study is that the genotoxic effect of hyperthermia shortly after combined epxosure (to hyperthermia and radiation) is not observed at 24 h after treatment." @default.
• W2405888939 created "2016-06-24" @default.
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• W2405888939 date "2016-05-27" @default.
• W2405888939 modified "2023-10-14" @default.
• W2405888939 title "Dynamics of chromosomal aberrations, induction of apoptosis, BRCA2 degradation and sensitization to radiation by hyperthermia" @default.
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• W2405888939 doi "https://doi.org/10.3892/ijmm.2016.2611" @default.
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