Abstract
Purpose
This study was to evaluate the influence of mtDNA deletion on the lung cancer cells under the conditions of hypoxia or irradiation.
Method
The treatment conditions of lung cancer cell lines with (A549) and without mtDNA (ρ0A549: obtained by inducing from A549) included 2 h of hypoxia and 4 Gy irradiation (group 1: without treatment; group 2: 2 h of hypoxia; group 3: 4 Gy irradiation; group 4: 2 h of hypoxia plus 4 Gy irradiation). The Human OneArray™ microarray was used to hybridize with the Cy5-labeled aRNA in microarray sample preparation. Differentially expressed genes (DEGs) between the lung cancer cells with and without mtDNA were identified using NOISeq package in R. Gene ontology and Kyoto Encyclopedia of Genes and Genomes (KEGG) pathway analyses were performed using the online tool of DAVID.
Result
In the KEGG pathway analysis of down-regulated DEGs, nineteen pathways were simultaneously enriched in the four groups, which were mainly metabolism- and biosynthesis-related pathways. Nine lung cancer-related pathways were enriched in group 4, and more cancer-associated DEGs, such as MYC, MAX, and E2F1 were found in group 4 than in the other groups.
Conclusion
The mtDNA deletion could inhibit the biosynthesis and metabolism of lung cancer cells and promote the effect of hypoxia and radiation on lung cancer cells. MYC might be the key gene of the cooperation of hypoxia and radiation and MYC, MAX, and E2F1 might play roles in hypoxia- and radiation-induced cell death in lung cancer cells without mtDNA.
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Acknowledgments
This study was supported by NSFC (Natural Science Foundation of China) No. 81372531. We wish to express our warm thanks to Fenghe (Shanghai) Information Technology Co., Ltd. Their ideas and help gave a valuable added dimension to our research.
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The author(s) declare that they have no competing interests.
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The Publisher and Editor retract this article in accordance with the recommendations of the Committee on Publication Ethics (COPE). After a thorough investigation we have strong reason to believe that the peer review process was compromised.
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Han, CB., Sun, L., Ma, JT. et al. RETRACTED ARTICLE: The Influence of mtDNA Deletion on Lung Cancer Cells Under the Conditions of Hypoxia and Irradiation. Lung 192, 997–1004 (2014). https://doi.org/10.1007/s00408-014-9639-9
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DOI: https://doi.org/10.1007/s00408-014-9639-9