Abstract
Breathing high concentrations of oxygen (hyperoxia) causes lung injury and is associated with lung diseases such as bronchopulmonary dysplasia (BPD), respiratory distress syndrome and persistent pulmonary hypertension of the newborns. Hyperoxia (95–100 %O2) causes DNA damage and growth arrest of lung cells and consequently cells die by apoptosis or necrosis. Although supplemental oxygen therapy is clinically important, the level and duration of hyperoxic exposure that would allow lung cells to reenter the cell cycle remains unclear. We hypothesized that cells exposed to lower concentrations of hyperoxia will retain the capacity to enter cell cycle when recovered in room air. We employed varying concentrations of oxygen (21–95 %) to determine the response of lung cells to hyperoxia. Our results indicate that cells were growth arrested and failed to reenter the cell cycle when exposed to greater than 60 % oxygen. Cell cycle checkpoint proteins were increased in a biphasic manner, increasing until 70 % oxygen, but declined in greater than 90 % oxygen. Microarray analysis shows that there is significant decrease in the abundance of Cdks 6-8 and retinoblastoma protein (Rb), p107 and p130 in exposure to 90 % oxygen for 48 h. We further tested the effect of clinically relevant as needed oxygen [(pro-re-nata (prn)] in premature infant (125-days and 140-days) baboon model of BPD. The microarray results show that 6 or 14d PRN oxygen-exposed animals had induced expression of chromosomal maintenance genes (MCMs), genes related to anti-inflammation, proliferation, and differentiation.
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Abbreviations
- MCM4:
-
Minichromosome maintenance deficient 4
- MCM6:
-
Minichromosome maintenance deficient 6
- TIMP3:
-
Tissue inhibitor of metalloproteinase 3
- E2F4:
-
E2F Transcription factor 4
- UBC:
-
Ubiquitin C
- Cyd3:
-
Cyclin D3
- P19A:
-
S-phase kinase 1A
- P16:
-
Cyclin-dependent kinase inhibitor 2A, p16INK4
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Acknowledgments
Research reported in this publication was supported by the National Heart, Lung And Blood Institute of the National Institutes of Health under Award Number R01HL 071558, HL1R01HL107885 and HL1R01HL109397. The content is solely the responsibility of the authors and does not necessarily represent the official view of the National Institutes of Health. We acknowledge the superb and dedicated assistance of numerous physician, nurses, technicians, and other personnel at the Bronchopulmonary Dysplasia (BPD) Resources Center (San Antonio, TX). Excellent technical assistance of Harish Muniyappa and Ravi Dashnamoorthy is acknowledged.
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Das, K.C., Wasnick, J.D. Biphasic response of checkpoint control proteins in hyperoxia: exposure to lower levels of oxygen induces genome maintenance genes in experimental baboon BPD. Mol Cell Biochem 395, 187–198 (2014). https://doi.org/10.1007/s11010-014-2124-1
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DOI: https://doi.org/10.1007/s11010-014-2124-1