Abstract
Background:
Cryopreservation can cause mechanical and chemical stress, ultimately leading to the formation of reactive oxygen species (ROS) and oxidative stress. ROS inhibits the expression of antioxidant enzymes in cells, resulting in increased DNA fragmentation and apoptosis. In this paper, we used a vitrification method that has the advantage of producing less ice crystal formation, cost-effectiveness, and time efficiency during cryopreservation. The objective of this paper is to evaluate the degree of protection of ovarian tissue against oxidative stress when N-acetylcysteine (NAC) and Klotho proteins are treated in the vitrification process of ovarian tissue.
Methods:
The control group and the cryopreservation groups were randomly assigned, and treated NAC, Klotho, or the combination (NAC + Klotho). The cell morphological change, DNA damage, senescence, and apoptosis of each group after the freeze–thaw process were compared using transmission electron microscopy, immunohistochemistry, and western blot analysis.
Results:
Both NAC and Klotho were found to be more effective at protecting against DNA damage than the control; however, DNA damage was greater in the NAC + Klotho group than in the group treated with NAC and Klotho, respectively. DNA damage and cellular senescence were also reduced during the vitrification process when cells were treated with NAC, Klotho, or the combination (NAC + Klotho). NAC increased apoptosis during cryopreservation, whereas Klotho inhibited apoptosis and NAC-induced apoptosis.
Conclusion:
This study highlights Klotho's benefits in inhibiting DNA damage, cell senescence, and apoptosis, including NAC-induced apoptosis, despite its unclear role in vitrification.
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Acknowledgements
This research was funded by the National Research Foundation of Korea Grant by the Korean Government, grant number NRF-2016R1C1B3015250 (date of approval: 1 March 2016).
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BK designed and performed the experiments. S-ML designed the study and analyzed data with analytic tools. S-JP designed and analyzed data. SL supervised the project, the main conceptual ideas and proof outline, and analyzed data. All authors wrote and revised the manuscript. All authors have read and agreed to the published version of the manuscript.
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The study protocol was approved by the institutional review board of Korea University (Korea-2020-0136). Informed consent was confirmed by the IRB.
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Kim, B., Lee, SM., Park, SJ. et al. Role of Klotho and N-acetylcysteine in Oxidative Stress Associated with the Vitrification of Ovarian Tissue Cytoprotective Function of Klotho in Cryopreservation. Tissue Eng Regen Med 20, 637–646 (2023). https://doi.org/10.1007/s13770-023-00556-7
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DOI: https://doi.org/10.1007/s13770-023-00556-7