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The Role of Oxidative Stress in Apoptosis and Cell Proliferation of Human Bronchial Epithelial Cells


Oxidative stress is an important pathophysiological factor in chronic respiratory diseases. Our study aimed at elucidating through which pathway oxidative stress–mediated apoptosis occurs at the gene expression level under oxidative stress in the human bronchial epithelial cell line BEAS-2B. Suitable doses and time period were detected by exposing BEAS-2B cells to hydrogen peroxide (H2O2) at different doses and time periods, and the oxidative-damaged cell culture model was designed. The treatment and control groups were compared in terms of gene expression levels determined by Quantitative Real Time Polymerase Chain Reaction. The oxidative-damaged cell model was confirmed by the spectrophotometric measurement of malondialdehyde and catalase activity (p < 0.05). Caspase-3, caspase-9, bax, and bak gene expression levels increased significantly in the treatment groups compared to the control group (p < 0.05). There were not any significant differences between the groups in terms of caspase-8, Bcl-2, and bik (p > 0.05). p53 and p21 gene expression levels were found to be significantly higher in the treatment groups (p < 0.05). H2O2-induced oxidative stress, induced apoptosis through the intrinsic pathway at gene expression level in the bronchial epithelial BEAS-2B cells was observed.

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Meral Urhan-Kucuk and Hasret Ecevit have carried out the design and coordinated the study as well as they have checked the last revisions and send the manuscript. The author of the PhD thesis Hasret Ecevit has carried out the experimental analysis and prepared the manuscript. Abdullah Arpacı has evaluated the experimental analysis. Haluk Uluca and Duygu Tap have assisted in experimental analysis.


This study is supported by Hatay Mustafa Kemal University Scientific Research Projects Unit (Project no. 16745) Hatay, Turkey.

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Correspondence to Meral Urhan-Kucuk.

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The authors declare that there is no conflict of interest. This article does not contain any studies involving animals or human participants performed by any of the authors.

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Ecevit, H., Urhan-Kucuk, M., Uluca, H. et al. The Role of Oxidative Stress in Apoptosis and Cell Proliferation of Human Bronchial Epithelial Cells. Cytol. Genet. 55, 283–289 (2021).

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  • apoptosis
  • BEAS-2B
  • cell proliferation
  • oxidative stress
  • reactive oxygen species