The Protective Function of PSMB5Overexpression to Human Lens Epithelial Cells under the Oxidative Environment
Tieying Zhang, Yuxian Zhang, Jing Wang
Department of Ophthalmology, Panyu Maternal and Child Care Service Center of Guangzhou, Hexian MemorialAffliated Hospital of Southern Medical University, Guangzhou 511400, China
Abstract：Objective:To observe theprotectivefunction of proteasomeβ5 subunit(PSMB5) overexpression to the human lens epithelial cells under the oxidative environment. Methods: Experimental study. Human lens epithelial cells strain of stable overexpression of PSMB5 gene was established as experimental group, and cell strain with empty pcDNA3.1 transfection as control group. Western blot was performed to detect the PSMB5 protein, proteasome β2 (PSMB7) protein, and proteasome β1 (PSMB6) protein expression in the two groups. Artifcial polypeptide Suc-Leu-Leu-Val-Tyr-AMC (LLVY), Boc-Bal-Gly-Arg-AMC (VGR), and Z-Leu-Leu-Glu-βNA(LLE)wereusedseparatelytodetecttheviabilitychanges ofthePSMB5,PSMB7,andPSMB6 protein in the two group cells. The cell viability and the intracellular carbonylated protein content change were detected after the experimental group cells and control group cells were treated by 40 μmol/LH2O2 Data were analyzed by a paired t test. Results: The expression of PSMB5 protein was signifcantly upregulated in PSMB5-transfected human lens epithelial cells than in the control group cells. The expression of subunit PSMB6 and PSMB7 protein were increased dramatically. Additionally, the proteasome activity of these three subunits were statistically higher. After exposure to 40 μmol/LH2O2for 4 hours, the cell viability were both inhibited in the control group cells and PSMB5transfected group cells, and the cell viability percentage were 6.99±3.43 % and 72.47±5.56 % respectively in thetwo groups. Butthecellviability was notably higher inthecontrol group cells than that in the PSMB5 transfected group cells, the difference was statistically signifcant (t=22.41, P<0.001). After 40 μmol/LH2O2 treated for 4 hours, the oxidation protein content in the control group cells and PSMB5 transfected group cells were 2.65±0.44 nmol/mg and 1.63±0.36 nmol/mg respectively, all increased than before treated by H2O2(0.41±0.10 nmol/mg and 0.45±0.12 nmol/mg).However, the oxidation protein content in the PSMB5 transfected group cells was statistically lower than in the control group cells (t=4.01, P=0.008). Conclusions: Overexpression of the PSMB5 gene catalytic subunit in human lens epithelial cells can increase the proteasome catalitic activity and cell antioxidative ability with protective effect.
张铁英, 张玉贤, 王静. 氧化环境下PSMB5基因对人晶状体上皮细胞的保护作用[J]. 中华眼视光学与视觉科学杂志, 2023, 25(3): 195-200.
Tieying Zhang, Yuxian Zhang, Jing Wang . The Protective Function of PSMB5Overexpression to Human Lens Epithelial Cells under the Oxidative Environment. Chinese Journal of Optometry Ophthalmology and Visual science, 2023, 25(3): 195-200. DOI: 10.3760/cma.j.cn115909-20220916-00361
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