期刊
INTERNATIONAL JOURNAL OF RADIATION BIOLOGY
卷 94, 期 12, 页码 1104-1115出版社
TAYLOR & FRANCIS LTD
DOI: 10.1080/09553002.2018.1516907
关键词
DNA damage; DNA damage response (DDR); pulmonary fibrosis
资金
- National Institute of Allergy and Infectious Diseases [R01 AI101732-01, U19AI091036]
- National Institute of Environmental Health Sciences [P30 ES-01247]
- National Institutes of Health Ruth L. Kirschstein National Research Service Award (NRSA) Institutional Research Training Grant [ES T32 07026]
- National Institutes of Health Multidisciplinary Training in Pulmonary Research [T32HL066988]
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 12.5Gy thorax only gamma radiation; their lungs were compared to age-matched unirradiated animals. Tissues were examined for DNA double-strand breaks (DSBs) (gamma-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 c-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.
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