AIM: To investigate the effect of high concentration of glucose(HCG) on double stranded RNA-activated protein kinase-like ER kinase(PERK)-eukaryotic initiation factor-2α(eIF2α)-transcription factor C/EBP homologous ...AIM: To investigate the effect of high concentration of glucose(HCG) on double stranded RNA-activated protein kinase-like ER kinase(PERK)-eukaryotic initiation factor-2α(eIF2α)-transcription factor C/EBP homologous protein(CHOP)-cysteine aspartate specific proteinase(caspase-12) signaling pathway activation and apoptosis in rabbit corneal epithelial cells(RCECs). METHODS: RCECs were treated by different concentrations of glucose for 0-48 h. The expressions of PERK, p-PERK, eIF2α, p-eIF2α, 78 k Da glucose-regulated protein 78(GRP78), CHOP, B-cell lymphoma 2(Bcl-2), B-cell lymphoma-2-associated X protein(Bax) and caspase-12 were determined by Western blot. Apoptosis was detected by TUNEL assay. Meanwhile, the function of PERK-eI F2α-CHOP-caspase-12 signaling pathway activation in high glucose-induced apoptosis was evaluated using PERK inhibitor, GSK2606414. RESULTS: HCG significantly promoted the expression of p-PERK, p-eIF2α, GRP78, CHOP, Bax and cleaved caspase-12 in RCECs(P<0.05), while remarkably decreased the expression of Bcl-2 and caspase-12(P<0.05), and the alterations caused by glucose were in concentration-and time-dependent manners. Meanwhile, PERK and eIF2α expressions were not affected in all groups(P>0.05). TUNEL assay showed that the apoptosis rate of RCECs in the HCG group increased significantly in contrast with that in the normal concentration of glucose or osmotic pressure control group(P<0.05), and the apoptosis rate increased with the increase of glucose concentration within limits(P<0.05). GSK2606414 down-regulated the expression of p-PERK and p-eI F2α in the HCG group(P<0.05), while still did not affect the expression of PERK and eIF2α among groups(P>0.05). Correspondingly, GSK2606414 also significantly reduced the apoptosis rate induced by high glucose(P<0.05). CONCLUSION: HCG activates PERK-eIF2α-CHOPcaspase-12 signaling pathway and promotes apoptosis of RCECs.展开更多
目的:比较飞秒激光小切口角膜基质透镜取出术(SMILE)术中旋转补偿对散光矫正的疗效。方法:检索PubMed、Web of Science、EMBASE、Cochrane以及CNKI、VIP、CBM和Wan Fang Data数据库,纳入2010-01/2022-08试验组为SMILE术中进行旋转补偿;...目的:比较飞秒激光小切口角膜基质透镜取出术(SMILE)术中旋转补偿对散光矫正的疗效。方法:检索PubMed、Web of Science、EMBASE、Cochrane以及CNKI、VIP、CBM和Wan Fang Data数据库,纳入2010-01/2022-08试验组为SMILE术中进行旋转补偿;对照组为SMILE术中不进行旋转补偿的临床对照研究。由两名研究员独立进行文献筛选、质量评价和数据提取后,使用Stata16.0软件对术后裸眼远视力(UDVA)、残余散光、矢量分析法用于衡量散光矫正效果的指标[包括误差角度的绝对值(|AE|):手术矫正散光的轴向与预期的误差绝对值;误差大小(ME):手术矫正散光与预期的算数差值]和术后总高阶像差、球差、彗差进行Meta分析。结果:最终纳入7篇文献,共846眼(试验组442眼,对照组404眼),Meta分析结果显示,两组患者在残余散光≥1.00D的眼所占百分比(OR=0.17,95%CI:0.06~0.49,P<0.01)、|AE|(WMD=-1.56,95%CI:-2.68~-0.45,P<0.01)、彗差(WMD=0.06,95%CI:-0.08~-0.04,P<0.01)和总高阶像差(WMD=-0.04,95%CI:-0.06~-0.02,P<0.01)均有差异,但在术后UDVA(WMD=0.00,95%CI:-0.02~0.01,P=0.54)、残余散光度数(WMD=0.08,95%CI:-0.02~0.18,P=0.10)、ME(WMD=-0.01,95%CI:-0.14~0.12,P=0.85)及球差(WMD=0.03,95%CI:-0.07~0.13,P=0.52)均无差异。结论:SMILE术中进行旋转补偿能有效减少散光矫正时因眼球旋转所致的角度误差、降低术后残余散光,在精确矫正散光的临床疗效上更具优势。展开更多
基金Supported by Shanghai Natural Science Foundation (No.19ZR1450500)National Foundation Cultivation Project of Tongji University (No.22120180285)the Good Physician Training Project of Yangpu District, Shanghai
文摘AIM: To investigate the effect of high concentration of glucose(HCG) on double stranded RNA-activated protein kinase-like ER kinase(PERK)-eukaryotic initiation factor-2α(eIF2α)-transcription factor C/EBP homologous protein(CHOP)-cysteine aspartate specific proteinase(caspase-12) signaling pathway activation and apoptosis in rabbit corneal epithelial cells(RCECs). METHODS: RCECs were treated by different concentrations of glucose for 0-48 h. The expressions of PERK, p-PERK, eIF2α, p-eIF2α, 78 k Da glucose-regulated protein 78(GRP78), CHOP, B-cell lymphoma 2(Bcl-2), B-cell lymphoma-2-associated X protein(Bax) and caspase-12 were determined by Western blot. Apoptosis was detected by TUNEL assay. Meanwhile, the function of PERK-eI F2α-CHOP-caspase-12 signaling pathway activation in high glucose-induced apoptosis was evaluated using PERK inhibitor, GSK2606414. RESULTS: HCG significantly promoted the expression of p-PERK, p-eIF2α, GRP78, CHOP, Bax and cleaved caspase-12 in RCECs(P<0.05), while remarkably decreased the expression of Bcl-2 and caspase-12(P<0.05), and the alterations caused by glucose were in concentration-and time-dependent manners. Meanwhile, PERK and eIF2α expressions were not affected in all groups(P>0.05). TUNEL assay showed that the apoptosis rate of RCECs in the HCG group increased significantly in contrast with that in the normal concentration of glucose or osmotic pressure control group(P<0.05), and the apoptosis rate increased with the increase of glucose concentration within limits(P<0.05). GSK2606414 down-regulated the expression of p-PERK and p-eI F2α in the HCG group(P<0.05), while still did not affect the expression of PERK and eIF2α among groups(P>0.05). Correspondingly, GSK2606414 also significantly reduced the apoptosis rate induced by high glucose(P<0.05). CONCLUSION: HCG activates PERK-eIF2α-CHOPcaspase-12 signaling pathway and promotes apoptosis of RCECs.
文摘目的:比较飞秒激光小切口角膜基质透镜取出术(SMILE)术中旋转补偿对散光矫正的疗效。方法:检索PubMed、Web of Science、EMBASE、Cochrane以及CNKI、VIP、CBM和Wan Fang Data数据库,纳入2010-01/2022-08试验组为SMILE术中进行旋转补偿;对照组为SMILE术中不进行旋转补偿的临床对照研究。由两名研究员独立进行文献筛选、质量评价和数据提取后,使用Stata16.0软件对术后裸眼远视力(UDVA)、残余散光、矢量分析法用于衡量散光矫正效果的指标[包括误差角度的绝对值(|AE|):手术矫正散光的轴向与预期的误差绝对值;误差大小(ME):手术矫正散光与预期的算数差值]和术后总高阶像差、球差、彗差进行Meta分析。结果:最终纳入7篇文献,共846眼(试验组442眼,对照组404眼),Meta分析结果显示,两组患者在残余散光≥1.00D的眼所占百分比(OR=0.17,95%CI:0.06~0.49,P<0.01)、|AE|(WMD=-1.56,95%CI:-2.68~-0.45,P<0.01)、彗差(WMD=0.06,95%CI:-0.08~-0.04,P<0.01)和总高阶像差(WMD=-0.04,95%CI:-0.06~-0.02,P<0.01)均有差异,但在术后UDVA(WMD=0.00,95%CI:-0.02~0.01,P=0.54)、残余散光度数(WMD=0.08,95%CI:-0.02~0.18,P=0.10)、ME(WMD=-0.01,95%CI:-0.14~0.12,P=0.85)及球差(WMD=0.03,95%CI:-0.07~0.13,P=0.52)均无差异。结论:SMILE术中进行旋转补偿能有效减少散光矫正时因眼球旋转所致的角度误差、降低术后残余散光,在精确矫正散光的临床疗效上更具优势。
