Role of Rapamycin and 3-MA in oxidative damage of HLECs caused by two doses of UVB radiation  

作　　者：Hao Yang Xiyuan Ping Yilei Cui Sifan Zheng Xingchao Shentu 

机构地区：[1]Department of Ophthalmology,The Second Affiliated Hospital of Zhejiang University School of Medicine、Zhejiang Provincial Key Lab of Ophthalmology,Hangzhou,China [2]GKT School of Medical Education,King's College London,London,UK

出　　处：《Advances in Ophthalmology Practice and Research》2023年第1期15-22,共8页眼科实践与研究新进展（英文）

基　　金：the National Natural Science Foundation of China(Grant no.81970781);the Natural Science Foundation of Zhejiang Province(no.LY17H090004);the National Natural Science Foundation of China(Grant no.81800807).

摘　　要：Background:This study compared the role of autophagy regulators Rapamycin and 3-MA in oxidative damage and apoptosis of human lens epithelial cells(HLECs)caused by two doses of Ultraviolet Radiation B(UVB).Methods:HLECs were irradiated with UVB,and two doses of UVB damage models were constructed.After treatment with autophagy regulators,cell damage tests such as CCK-8,LDH activity,and Ros detection were performed.Western blotting was used to detect the levels of autophagy-related proteins and apoptosis-related proteins.Quantitative real-time PCR(RT-qPCR)was used to detect the mRNA leve of secondary antioxidant enzymes.Flow cytometry was used to examine cell viability and apoptosis.Finally,the proportion of autophagy and apoptosis was observed by electron microscope.Results:Autophagy inhibitor 3-MA promoted oxidative damage and apoptosis of HLECs at low doses of UVB(5 mJ/cm2),which corresponds to 1.3 h of exposure to sunlight in human eyes.Under the high dose of UVB(50mJ/cm2),which is equivalent to 13 h of exposure to sunlight in human eyes,the autophagy inducer Rapamycin caused more extensive oxidative damage and apoptosis of HLECs.3-MA was able to reduce this damage,indicating that moderate autophagy is necessary for HLECs to cope with mild oxidative stress.For high dose UVBinduced oxidative stress,the use of 3-MA inhibiting autophagy is more beneficial to reduce cell damage and apoptosis.The mechanisms include degradation of damaged organelles,regulation of the expression of antioxidant enzymes HO-1,NQO1,GCS and regulation of apoptosis-related proteins.Conclusions:Autophagy played different roles in HLECs oxidative stress induced by two doses of UVB.It provides new ideas for reducing oxidative damage and apoptosis of HLECs to prevent or delay the progression of agerelated cataract(ARC).

关 键 词：CATARACT UVB AUTOPHAGY Apoptosis HLECs Oxidative stress 

分 类 号：R779.12[医药卫生—眼科]