Preprint Article Version 1 This version is not peer-reviewed

Nrf2 Inhibits Periodontal Ligament Stem Cell Apoptosis under Excessive Oxidative Stress

Version 1 : Received: 4 April 2017 / Approved: 4 April 2017 / Online: 4 April 2017 (08:58:13 CEST)

A peer-reviewed article of this Preprint also exists.

Liu, Y.; Yang, H.; Wen, Y.; Li, B.; Zhao, Y.; Xing, J.; Zhang, M.; Chen, Y. Nrf2 Inhibits Periodontal Ligament Stem Cell Apoptosis under Excessive Oxidative Stress. Int. J. Mol. Sci. 2017, 18, 1076. Liu, Y.; Yang, H.; Wen, Y.; Li, B.; Zhao, Y.; Xing, J.; Zhang, M.; Chen, Y. Nrf2 Inhibits Periodontal Ligament Stem Cell Apoptosis under Excessive Oxidative Stress. Int. J. Mol. Sci. 2017, 18, 1076.

Journal reference: Int. J. Mol. Sci. 2017, 18, 1076
DOI: 10.3390/ijms18051076

Abstract

The present study aimed to analyze novel mechanisms underlying Nrf2-mediated anti-apoptosis in periodontal ligament stem cells (PDLSCs) in the periodontitis oxidative microenvironment. We created an oxidative stress model with H2O2-treated PDLSCs. Herein, we used real-time PCR, western blotting, TUNEL staining, fluorogenic assay and transfer genetics to confirm the degree of oxidative stress and apoptosis as well as the Nrf2 function. Surprisingly, we demonstrated that with up-regulated ROS and MDA levels, the effect of oxidative stress was obvious under H2O2 treatment. Anti-oxidative molecules were changed after the H2O2 exposure, whereby the anti-oxidative signaling of Nrf2 was activated with the increase of its downstream effectors, HO-1, NQO1 and γ-GCS. Additionally, the apoptosis levels gradually increased with oxidative stress and changes in the caspase-9, caspase-3, Bax and c-Fos levels, but not with caspase-8 and down-regulated Bcl-2. The enhanced antioxidant effect could not resist the occurrence of apoptosis. Furthermore, Nrf2 overexpression effectively improved the anti-oxidative levels and increased cell proliferation. At the same time, overexpression effectively restrained TUNEL staining and decreased the molecular levels of caspase-9, caspase-3, et al, but not that of caspase-8. By contrast, silencing the expression Nrf2 levels had the opposite effect. Collectively, Nrf2 alleviates PDLSCs via its effects on anti-oxidative and anti-intrinsic apoptosis by the activation of anti-oxidative enzymes.

Subject Areas

periodontitis; the periodontal ligament stem cells; the nuclear factor-erythroid 2-related factor 2; oxidative stress; apoptosis

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