AIM:To explore the effect of silent information regulator factor 2-related enzyme 1(SIRT1)on modulating apoptosis of human lens epithelial cells(HLECs)and alleviating lens opacification of rats through suppressing end...AIM:To explore the effect of silent information regulator factor 2-related enzyme 1(SIRT1)on modulating apoptosis of human lens epithelial cells(HLECs)and alleviating lens opacification of rats through suppressing endoplasmic reticulum(ER)stress.METHODS:HLECs(SRA01/04)were treated with varying concentrations of tunicamycin(TM)for 24h,and the expression of SIRT1 and C/EBP homologous protein(CHOP)was assessed using real-time quantitative polymerase chain reaction(RT-PCR),Western blotting,and immunofluorescence.Cell morphology and proliferation was evaluated using an inverted microscope and cell counting kit-8(CCK-8)assay,respectively.In the SRA01/04 cell apoptosis model,which underwent siRNA transfection for SIRT1 knockdown and SRT1720 treatment for its activation,the expression levels of SIRT1,CHOP,glucose regulated protein 78(GRP78),and activating transcription factor 4(ATF4)were examined.The potential reversal of SIRT1 knockdown effects by 4-phenyl butyric acid(4-PBA;an ER stress inhibitor)was investigated.In vivo,age-related cataract(ARC)rat models were induced by sodium selenite injection,and the protective role of SIRT1,activated by SRT1720 intraperitoneal injections,was evaluated through morphology observation,hematoxylin and eosin(H&E)staining,Western blotting,and RT-PCR.RESULTS:SIRT1 expression was downregulated in TMinduced SRA01/04 cells.Besides,in SRA01/04 cells,both cell apoptosis and CHOP expression increased with the rising doses of TM.ER stress was stimulated by TM,as evidenced by the increased GRP78 and ATF4 in the SRA01/04 cell apoptosis model.Inhibition of SIRT1 by siRNA knockdown increased ER stress activation,whereas SRT1720 treatment had opposite results.4-PBA partly reverse the adverse effect of SIRT1 knockdown on apoptosis.In vivo,SRT1720 attenuated the lens opacification and weakened the ER stress activation in ARC rat models.CONCLUSION:SIRT1 plays a protective role against TM-induced apoptosis in HLECs and slows the progression of cataract in rats by inhibiting ER stress.These findings suggest a novel strategy for cataract treatment focused on targeting ER stress,highlighting the therapeutic potential of SIRT1 modulation in ARC development.展开更多
目的:分析关节腔积液中沉默信息调节因子2相关酶1(silencing information regulator 2 related enzyme 1,SIRT1),肿瘤坏死因子样弱凋亡诱导因子(tumor necrosis factor-like weak inducer of apoptosis,TWEAK)表达与膝骨关节炎的相关性...目的:分析关节腔积液中沉默信息调节因子2相关酶1(silencing information regulator 2 related enzyme 1,SIRT1),肿瘤坏死因子样弱凋亡诱导因子(tumor necrosis factor-like weak inducer of apoptosis,TWEAK)表达与膝骨关节炎的相关性。方法:选择2019年2月至2021年8月收治的103例膝骨关节患者(膝骨关节炎组),男40例,女63例,年龄(62.02±6.09)岁。根据改良Mankin评分将患者分为轻度组(Mankin评分1~4分,31例)、中度组(Mankin评分5~8分,40例)和重度组(Mankin评分≥9分,32例),另选择105例体检志愿者为对照组,男46例,女59例,年龄(62.11±6.34)岁。膝骨关节炎组检测关节腔积液和血清中SIRT1、TWEAK水平,对照组仅检测血清SIRT1、TWEAK水平。分析SIRT1、TWEAK与膝骨关节炎发生和病情的关系。结果:膝骨关节炎组关节腔积液TWEAK,血清TWEAK、C反应蛋白(C-reactive protein,CRP)、白细胞介素-6(interleukin,IL-6)、IL-1β、白细胞计数、红细胞沉降率(erythrocyte sedimentation rate,ESR)高于对照组(P<0.05),关节腔积液SIRT1、血清SIRT1低于对照组(P<0.05)。重度组关节腔积液中TWEAK水平高于中度组和轻度组(P<0.05),SIRT1低于中度组和轻度组(P<0.05)。关节腔积液中SIRT1水平与血清SIRT1水平呈正相关(P<0.05),与CRP、IL-6、IL-1β、白细胞计数、改良Mankin评分、ESR呈负相关(P<0.05);关节腔积液中TWEAK水平与血清TWEAK水平呈正相关(P<0.05),与CRP、IL-6、IL-1β、白细胞计数、改良Mankin评分、ESR呈正相关(P<0.05)。身体质量指数、从事重体力工作、关节腔积液TWEAK是膝骨关节炎发生的危险因素(P<0.05),关节腔积液SIRT1是膝骨关节炎发生的保护因素(P<0.05)。关节腔积液SIRT1、TWEAK诊断膝骨关节炎的曲线下面积(area undre curve,AUC)为0.641、0.653,联合关节腔积液SIRT1、TWEAK诊断膝骨关节炎的AUC为0.879,高于单独SIRT1、TWEAK(z=6.105、6.225,P<0.05)。结论:膝骨关节炎患者关节腔积液中SIRT1水平降低,TWEAK水平增高,低SIRT1和高TWEAK与膝骨关节炎发病以及病情加重均有关。展开更多
基金Supported by National Natural Science Foundation for Young Scientists of China(No.82101097)National Natural Science Foundation of China(No.82070937).
文摘AIM:To explore the effect of silent information regulator factor 2-related enzyme 1(SIRT1)on modulating apoptosis of human lens epithelial cells(HLECs)and alleviating lens opacification of rats through suppressing endoplasmic reticulum(ER)stress.METHODS:HLECs(SRA01/04)were treated with varying concentrations of tunicamycin(TM)for 24h,and the expression of SIRT1 and C/EBP homologous protein(CHOP)was assessed using real-time quantitative polymerase chain reaction(RT-PCR),Western blotting,and immunofluorescence.Cell morphology and proliferation was evaluated using an inverted microscope and cell counting kit-8(CCK-8)assay,respectively.In the SRA01/04 cell apoptosis model,which underwent siRNA transfection for SIRT1 knockdown and SRT1720 treatment for its activation,the expression levels of SIRT1,CHOP,glucose regulated protein 78(GRP78),and activating transcription factor 4(ATF4)were examined.The potential reversal of SIRT1 knockdown effects by 4-phenyl butyric acid(4-PBA;an ER stress inhibitor)was investigated.In vivo,age-related cataract(ARC)rat models were induced by sodium selenite injection,and the protective role of SIRT1,activated by SRT1720 intraperitoneal injections,was evaluated through morphology observation,hematoxylin and eosin(H&E)staining,Western blotting,and RT-PCR.RESULTS:SIRT1 expression was downregulated in TMinduced SRA01/04 cells.Besides,in SRA01/04 cells,both cell apoptosis and CHOP expression increased with the rising doses of TM.ER stress was stimulated by TM,as evidenced by the increased GRP78 and ATF4 in the SRA01/04 cell apoptosis model.Inhibition of SIRT1 by siRNA knockdown increased ER stress activation,whereas SRT1720 treatment had opposite results.4-PBA partly reverse the adverse effect of SIRT1 knockdown on apoptosis.In vivo,SRT1720 attenuated the lens opacification and weakened the ER stress activation in ARC rat models.CONCLUSION:SIRT1 plays a protective role against TM-induced apoptosis in HLECs and slows the progression of cataract in rats by inhibiting ER stress.These findings suggest a novel strategy for cataract treatment focused on targeting ER stress,highlighting the therapeutic potential of SIRT1 modulation in ARC development.
