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- W2892237476 abstract "Purpose: Radiation-induced lung injuries (RILI), namely radiation pneumonitis and/or fibrosis, are dose-limiting outcomes following treatment for thoracic cancers. As part of a search for mitigation targets, we sought to determine if persistent DNA damage is a characteristic of this progressive injury.Methods: C57BL/6J female mice were sacrificed at 24 h, 1, 4, 12, 16, 24 and 32 weeks following a single dose of 12.5 Gy thorax only gamma radiation; their lungs were compared to age-matched unirradiated animals. Tissues were examined for DNA double-strand breaks (DSBs) (γ-H2A.X and p53bp1), cellular senescence (senescence-associated beta-galactosidase and p21) and oxidative stress (malondialdehyde).Results: Data revealed consistently higher numbers of DSBs compared to age-matched controls, with increases in γ-H2A.X positivity beyond 24 h post-exposure, particularly during the pathological phases, suggesting periods of recurrent DNA damage. Additional intermittent increases in both cellular senescence and oxidative stress also appeared to coincide with pneumonitis and fibrosis.Conclusions: These novel, long-term data indicate (a) increased and persistent levels of DSBs, oxidative stress and cellular senescence may serve as bioindicators of RILI, and (b) prevention of genotoxicity, via mitigation of free radical production, continues to be a potential strategy for the prevention of pulmonary radiation injury." @default.
- W2892237476 created "2018-09-27" @default.
- W2892237476 creator A5003868236 @default.
- W2892237476 creator A5066804914 @default.
- W2892237476 creator A5073038910 @default.
- W2892237476 creator A5088760586 @default.
- W2892237476 creator A5089732429 @default.
- W2892237476 date "2018-09-21" @default.
- W2892237476 modified "2023-10-15" @default.
- W2892237476 title "Recurrent DNA damage is associated with persistent injury in progressive radiation-induced pulmonary fibrosis" @default.
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- W2892237476 doi "https://doi.org/10.1080/09553002.2018.1516907" @default.
- W2892237476 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/6309234" @default.