miR-211 promotes lens epithelial cells apoptosis by targeting silent mating-type information regulation 2 homolog 1 in age-related cataracts
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Qi-Chang Yan. Department of Ophthalmology, the Fourth Affiliated Hospital of China Medical University, Key Laboratory of Lens Research of Liaoning Province, Eye Hospital of China Medical University, 11 Xinhua Road, Heping District, Shenyang 110005, Liaoning Province, China. cmu4h-yqc@126.com

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Supported by the National Natural Science Foundation of China (No.81170836; No.81570838); the Natural Science Foundation of Liaoning Province, China (No.2015020474); the Liaoning Provincial Hospital Program for Building Treatment Capacity in Key Clinical Departments (No.LNCCC-D15-2015).

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    Abstract:

    AIM: To detect the expression of miR-211 in age-related cataract tissue, explore the effects of miR-211 on lens epithelial cell proliferation and apoptosis, and identify its target gene. METHODS: This study used real-time quantitative polymerase chain reaction (RT-qPCR) to measure the expression of miR-211 and its predicted target gene [silent mating-type information regulation 2 homolog 1 (SIRT1)] in 46 anterior lens capsules collected from age-related cataract patients. Human lens epithelial cell line (SRA01/04) cells were transfected with either miR-211 mimics, mimic controls, miR-211 inhibitors or inhibitor controls, 72h after transfection, miRNA and protein expression of SIRT1 were measured using RT-qPCR and Western blotting; then cells were exposed to 200 μmol/L H2O2 for 1h, whereupon cell viability was measured by MTS assay, caspase-3 assay was performed. Dual luciferase reporter assay was performed to verify the relationship between miR-211 of SIRT1. RESULTS: Compared to the control group, expression of miR-211 was significantly increased (P<0.001), the miRNA and protein expression of SIRT1 were significantly decreased (P<0.001) in the anterior lens capsules of patients with age-related cataracts. Relative to the control group, SIRT1 miRNA and protein levels in the miR-211 mimic group were significantly reduced, cell proliferation activity significantly decreased, and caspase-3 activity was significantly increased (P<0.001). In the miR-211 inhibitor group, SIRT1 miRNA and protein expression were significantly increased, cell proliferation activity significantly increased, and caspase-3 activity was significantly decreased (P<0.001). A dual luciferase reporter assay confirmed that SIRT1 is a direct target of miR-211. CONCLUSION: miR-211 is highly expressed in the anterior lens capsules of patients with age-related cataracts. By negatively regulating the expression of SIRT1, miR-211 promotes lens epithelial cell apoptosis and inhibits lens epithelial cell proliferation.

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Bo Lu, Ian T. Christensen, Li-Wei Ma, et al. miR-211 promotes lens epithelial cells apoptosis by targeting silent mating-type information regulation 2 homolog 1 in age-related cataracts. Int J Ophthalmol, 2018,11(2):201-207

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Publication History
  • Received:August 10,2017
  • Revised:November 21,2017
  • Adopted:
  • Online: February 06,2018
  • Published: