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other·ophthalmology, cataract surgery, preclinical research, biomedical research, ocular immunology·PMC10880533

Sestrin 2 protects human lens epithelial cells from oxidative stress and apoptosis induced by hydrogen peroxide by regulating the mTOR/Nrf2 pathway

International Journal of Immunopathology and Pharmacology · 2 authors, 2 centres

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Inhibition of mTOR (rapamycin) or knockdown of Nrf2 reversed the protective effects of SESN2.

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Inhibition of mTOR (rapamycin) or knockdown of Nrf2 reversed the protective effects of SESN2. The findings suggest SESN2 protects human lens cells via the mTOR/Nrf2 pathway.

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other

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ophthalmology

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ORIGINAL PAPER

PMC10880533

Sestrin 2 protects human lens epithelial cells from oxidative stress and apoptosis induced by hydrogen peroxide by regulating the mTOR/Nrf2 pathway

International Journal of Immunopathology and Pharmacology

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ABSTRACT

Objective We aimed to explore the effect and potential mechanism of Sestrin 2 (SESN2) in human lens epithelial cells (HLECs). Methods To mimic the oxidative stress environment, SAR01/04 cells were treated with 200 μM hydrogen peroxide (H 2 O 2 ) for 24 h. Cell viability and apoptosis were checked by cell counting kit-8 and flow cytometry. Western blot was taken to check the protein changes of SESN2, B-cell lymphoma-2 (Bcl-2), Bcl-2-associated X (Bax), mechanistic target of rapamycin (mTOR), phosphorylated (p)-mTOR, ribosomal protein S6 kinase B1 (p70S6K), p-p70S6K, and nuclear factor erythroid 2-related factor 2 (Nrf2). Superoxide dismutase (SOD), catalase (CAT), malondialdehyde (MDA), and reactive oxygen species (ROS) were detected via the corresponding reagent kit. The levels of interleukin (IL)-1β, IL-18, and tumor necrosis factor (TNF)-α were measured using enzyme-linked immunosorbent assay. Results SESN2 was down-regulated in cataract lens tissue and up-regulated in SAR01/04 cells treated with H 2 O 2 . Under treatment of H 2 O 2 , up-regulation of SESN2 improved cell viability, enhanced the activity of SOD and CAT, inhibited cell apoptosis, and reduced the levels of MDA, ROS, IL-1β, IL-18, and TNF-α, while down-regulation of SESN2 caused the contrary effects. Further bioinformatics analysis suggested that SESN2 regulated the mTOR signaling pathway. Treatment of H 2 O 2 inhibited p-mTOR and p-p70S6K protein expression, while overexpression of SESN2 increased p-mTOR and p-p70S6K protein expression in the H 2 O 2 group and down-regulation of SESN2 further decreased p-mTOR and p-p70S6K protein expression in the H 2 O 2 group. Additionally, H 2 O 2 increased Nrf2 protein expression, and overexpression of SESN2 further increased Nrf2 protein expression in the H 2 O 2 group. Importantly, rapamycin (an inhibitor of mTOR signaling pathway) and knockdown of Nrf2 reversed the promotive effects of SESN2 on cell viability and the inhibitive effects of SESN2 on cell apoptosis, oxidative stress, and inflammatory reaction. Conclusion SESN2 protected HLECs damage induced by H 2 O 2 , which was related to the activation of mTOR/Nrf2 pathway.

CITATION EXPORT

Xiao Tian, Jie Wei. Sestrin 2 protects human lens epithelial cells from oxidative stress and apoptosis induced by hydrogen peroxide by regulating the mTOR/Nrf2 pathway. International Journal of Immunopathology and Pharmacology. (2024). https://doi.org/10.1177/03946320241234741

AUTHORS

2 · 2 CENTRES

Xiao Tian, Jie Wei

1Department of Ophthalmology, Jinan Aier Eye Hospital, Jinan, China
2Department of Ophthalmology, No. 960 Hospital of PLA Joint Logistic Support Force, Jinan, China