Abstract
Background
Human periodontal ligament cells (hPDLCs) can be applied in periodontal regeneration engineering to repair the tissue defects related to periodontitis. Theoretically, it can affect the vitality of hPDLCs that cell aging increases apoptosis and decreases autophagy. Autophagy is a highly conserved degradation mechanism, which degrades the aging and damaged intracellular organelles through autophagy lysosomes to maintain normal intracellular homeostasis. Meanwhile, autophagy-related gene 7 (ATG7) is a key gene that regulates the level of cellular autophagy.
Objective
This study was to explore the effects of autophagic regulation of aging hPDLCs on cell proliferation and cell apoptosis.
Methods
A cell model of aging hPDLCs overexpressing and silencing ATG7 were respectively constructed by lentiviral vectors in vitro. A series of experiments was performed to confirm relevant senescence phenotype on aging hPDLCs, and to detect the effects of changes in autophagy on their proliferation and apoptosis-related factors in aging hPDLCs.
Results
The results showed that overexpression of ATG7 could motivate autophagy, promoting proliferation of aging hPDLCs and inhibiting apoptosis synchronously (P < 0.05). On the contrary, suppressing autophagy levels by silencing ATG7 would inhibit cell proliferation and accelerate cell senescence (P < 0.05).
Conclusion
ATG7 regulates the proliferation and apoptosis of aging hPDLCs. Hence, autophagy may act as a target to delay senescence of hPDLCs, which can be helpful in the future in-depth study on regeneration and functionalization of periodontal supporting tissues.
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Funding
This work was supported by the National Natural Science Foundation of China (grant number: 31801191), Research Fund of Lanzhou University (grant number: lzukqky-2019-t01, 533000-0711000-98-132, 20JR10RA653-ZDKF20210103), the Key Research Fund of Gansu Province (grant number: 21YF5GA100).
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Xiangyi He and Zhidong Zhang contributed to the conception and design of this study. Yanmin Li and Xiaodong Qin contributed to experimental design. Yiheng Wang and Xinyi Li conceived the idea and wrote the manuscript. Yiheng Wang, Xiongtao Zhou, Yuan Liu, Tao Wang and Jianbao Feng performed the experiments, data acquisition and analysis. All the authors have given final approval of this article.
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Wang, Y., Li, X., Zhou, X. et al. Regulation of proliferation and apoptosis of aging periodontal ligament cells by autophagy-related gene 7. Mol Biol Rep 50, 6361–6372 (2023). https://doi.org/10.1007/s11033-023-08473-7
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DOI: https://doi.org/10.1007/s11033-023-08473-7