TGF-β1基因转染可抑制人晶状体上皮细胞增殖

目的:探讨脂质体介导的TGF-β1基因(pEGFP-TGF-β1)转染对人品状体上皮细胞(HLEC)系B3(HLEC-B3)增殖、凋亡及细胞周期的影响.方法:将pEGFP-TGF-β1转染HLEC-B3,观察细胞形态变化;采用乍长曲线法、噻唑蓝比色法分析细胞增殖改变;使用流式细胞仪测定细胞凋亡变化、分析细胞周期改变(DNA 倍体法).结果:pEGFP-TGF-β1成功转染后,HLEC-B3逐渐变圆、脱壁.转染后24～48h细胞的增殖受到抑制,与相应对照组比较,差异均有统计学意义(P＜0.01);凋亡细胞比例(转染24h为(21.0±1.7)%,转染48h至(43.6±1.4)%明显升高,与相应对照组[24h为(0.42±0.06)%,48h为(0.60±0.02%)]比较,差异均有统计学意义(P＜0.01);细胞出现G1期阻滞现象,表现为G1期细胞比例[转染 24h 为(72.0±1.9)%,转染48h为(74.7±2.2)%]增加和S期细胞比例[转染24h为620.4±2.2)%,转染48h为(19.4±1.4)%]下降,与相应对照组比较,差异均有统计学意义(P＜0.01).结论:pEGFP-TGF-β1可成功转染HLEC-B3,诱发细胞G1期阻滞,有效抑制细胞增殖,诱导细胞凋亡.     

miR-375表达对脉络膜黑色素瘤细胞增殖和侵袭的影响

目的：探讨miR-375表达对脉络膜黑色素瘤MUM-2B细胞增殖和侵袭的影响。

方法：培养MUM-2B细胞,分别转染miR-375模拟物序列(模拟物组)、miR-375抑制物序列(抑制物组)、阴性对照序列(阴性对照组)和不做任何处理(空白组),分别采用qRT-PCR实验、CCK-8实验、细胞凋亡实验、Transwell实验检测细胞中miR-375、细胞增殖活性、细胞凋亡情况、细胞迁移和侵袭情况。

结果：相比于阴性对照组(1.01±0.10)和空白组(1.03±0.07),模拟物组细胞中miR-375表达量(2.65±0.15)升高,而抑制物组细胞中miR-375表达量(0.28±0.06)降低(P<0.05); 与空白组和阴性对照组比较,模拟物组细胞24、48、72和96h时OD值均降低(P<0.05),而抑制物组细胞24、48、72和96h时OD值均升高(P<0.05); 与空白组细胞凋亡率(20.54±4.01)%和阴性对照组细胞凋亡率(22.80±4.28)%比较,模拟物组细胞凋亡率(39.11±3.37)%升高(P<0.05),而抑制物组细胞凋亡率(10.13±2.17)%降低(P<0.05); 与空白组和阴性对照组比较,模拟物组细胞迁移数和细胞侵袭数均降低(P<0.05),而抑制物组细胞迁移数和细胞侵袭数均升高(P<0.05)。

结论：上调MUM-2B细胞中miR-375表达可降低细胞增殖活性,加速细胞凋亡,抑制细胞迁移和侵袭,下调miR-375表达则发挥相反的作用,表明miR-375可能在脉胳膜黑色素瘤病程中发挥抑癌功能。     

水蛭提取液对人视网膜母细胞瘤细胞的抑制作用

目的：研究水蛭提取液对人视网膜母细胞瘤WERI-RB-1细胞的抑制作用。

方法：采用不同浓度水蛭提取液(0.02、0.04、0.08、0.16U/mL)作用于体外培养的WERI-RB-1细胞0、24、48、72h,经CCK-8法筛选最佳药物干预浓度和时间进行后续实验。将体外培养的WERI-RB-1细胞分为对照组(正常培养基培养)和实验组(含水蛭提取液培养基培养),采用流式细胞仪检测药物对细胞周期和细胞凋亡的影响,Transwell侵袭实验检测药物对细胞侵袭能力的影响。

结果：根据CCK-8法检测结果选择0.04、0.08U/mL水蛭提取液作用48h为最佳干预条件进行实验。水蛭提取液干预的细胞主要阻滞在G2/M期,其中0.04、0.08U/mL实验组处于G2/M期的阳性细胞率分别为(12.59±5.36)%、(14.79±4.12)%,均明显高于对照组\〖(3.00±2.32)%,P<0.01\〗。水蛭提取液可诱导细胞凋亡,其中0.04、0.08U/mL实验组细胞凋亡率分别(37.91±3.44)%、(33.05±2.25)%,均明显高于对照组\〖(4.64±2.56)%,P<0.01\〗。Transwell侵袭实验检测结果显示,实验组Transwell小室下细胞数明显少于对照组,表明水蛭提取液能够抑制细胞侵袭。

结论：水蛭提取液在体外实验中能够抑制人视网膜母细胞瘤细胞的增殖、侵袭,并诱导细胞凋亡。     

重组腺相关病毒介导的HSV-tk/GCV体系对兔晶状体上皮细胞的抑制作用

目的 探讨2型重组腺相关病毒(rAAV2)载体介导的单纯疱疹病毒胸苷激酶基因/丙氧鸟苷体系(HSV-tk/GCV)对体外培养兔晶状体上皮细胞(N/N1003A)的抑制作用,以及晶状体上皮细胞死亡的机制.方法 实验研究.rAAV2载体介导增强型绿色荧光蛋白基因(EGFP)转染体外培养N/N1003A细胞,倒置荧光显微镜观察细胞中EGFP的表达,流式细胞仪检测病毒的转染效率.重组病毒rAAV2/HSV-tk转染体外培养的N/N1003A细胞为实验组,以没有转染重组病毒的细胞作为对照组,MTT法检测HSV-tk/GCV体系对细胞作用的浓度依赖性、时间依赖性和旁观者效应;相差显微镜、透射电镜、Hoechst33258染色观察细胞凋亡、坏死改变,流式细胞仪检测细胞凋亡率和细胞周期的变化.不同浓度GCV对两组细胞的作用结果采用两因素析因设计的方差分析;两组细胞周期和凋亡的比较采用两样本t检验.结果 rAAV2载体能介导EGFP基因稳定高效转染N/N1003A细胞.GCV对两组细胞的杀伤作用有剂量-效应依赖关系(F=13 076.239,P<0.001);实验组N/N1003A-tk细胞的存活率低于对照组,差异有统计学意义(F=53 947.119,P<0.001).实验组GCV的IC50为2 mg/L,而对照组IC50为524 mg/L.GCV的杀伤效应随时间延长而增强,且存在明显的旁观者效应.N/N1003A-tk细胞在GCV作用下出现明显的细胞凋亡和坏死,细胞的凋亡率7.18%±2.04%,与对照组(3.50%±0.56%)比较差异有统计学意义(t=3.83,P<0.01);S期细胞比例明显增加,G0/G1期细胞比例明显减少,与对照组比较差异有统计学意义(S期细胞比例:t=3.55,P<0.01;G0/G1期细胞比例:t=4.29,P<0.01).结论 GCV可有效杀伤重组腺相关病毒rAAV2/HSV-tk转染的兔晶状体上皮细胞,并具有较强的旁观者效应.     

重组腺相关病毒介导的HSV-tk/GCV体系对兔晶状体上皮细胞的抑制作用

目的 探讨2型重组腺相关病毒(rAAV2)载体介导的单纯疱疹病毒胸苷激酶基因/丙氧鸟苷体系(HSV-tk/GCV)对体外培养兔晶状体上皮细胞(N/N1003A)的抑制作用,以及晶状体上皮细胞死亡的机制.方法 实验研究.rAAV2载体介导增强型绿色荧光蛋白基因(EGFP)转染体外培养N/N1003A细胞,倒置荧光显微镜观察细胞中EGFP的表达,流式细胞仪检测病毒的转染效率.重组病毒rAAV2/HSV-tk转染体外培养的N/N1003A细胞为实验组,以没有转染重组病毒的细胞作为对照组,MTT法检测HSV-tk/GCV体系对细胞作用的浓度依赖性、时间依赖性和旁观者效应;相差显微镜、透射电镜、Hoechst33258染色观察细胞凋亡、坏死改变,流式细胞仪检测细胞凋亡率和细胞周期的变化.不同浓度GCV对两组细胞的作用结果采用两因素析因设计的方差分析;两组细胞周期和凋亡的比较采用两样本t检验.结果 rAAV2载体能介导EGFP基因稳定高效转染N/N1003A细胞.GCV对两组细胞的杀伤作用有剂量-效应依赖关系(F=13 076.239,P<0.001);实验组N/N1003A-tk细胞的存活率低于对照组,差异有统计学意义(F=53 947.119,P<0.001).实验组GCV的IC50为2 mg/L,而对照组IC50为524 mg/L.GCV的杀伤效应随时间延长而增强,且存在明显的旁观者效应.N/N1003A-tk细胞在GCV作用下出现明显的细胞凋亡和坏死,细胞的凋亡率7.18%±2.04%,与对照组(3.50%±0.56%)比较差异有统计学意义(t=3.83,P<0.01);S期细胞比例明显增加,G0/G1期细胞比例明显减少,与对照组比较差异有统计学意义(S期细胞比例:t=3.55,P<0.01;G0/G1期细胞比例:t=4.29,P<0.01).结论 GCV可有效杀伤重组腺相关病毒rAAV2/HSV-tk转染的兔晶状体上皮细胞,并具有较强的旁观者效应.     

重组腺相关病毒介导的HSV-tk/GCV体系对兔晶状体上皮细胞的抑制作用

目的 探讨2型重组腺相关病毒(rAAV2)载体介导的单纯疱疹病毒胸苷激酶基因/丙氧鸟苷体系(HSV-tk/GCV)对体外培养兔晶状体上皮细胞(N/N1003A)的抑制作用,以及晶状体上皮细胞死亡的机制.方法 实验研究.rAAV2载体介导增强型绿色荧光蛋白基因(EGFP)转染体外培养N/N1003A细胞,倒置荧光显微镜观察细胞中EGFP的表达,流式细胞仪检测病毒的转染效率.重组病毒rAAV2/HSV-tk转染体外培养的N/N1003A细胞为实验组,以没有转染重组病毒的细胞作为对照组,MTT法检测HSV-tk/GCV体系对细胞作用的浓度依赖性、时间依赖性和旁观者效应;相差显微镜、透射电镜、Hoechst33258染色观察细胞凋亡、坏死改变,流式细胞仪检测细胞凋亡率和细胞周期的变化.不同浓度GCV对两组细胞的作用结果采用两因素析因设计的方差分析;两组细胞周期和凋亡的比较采用两样本t检验.结果 rAAV2载体能介导EGFP基因稳定高效转染N/N1003A细胞.GCV对两组细胞的杀伤作用有剂量-效应依赖关系(F=13 076.239,P<0.001);实验组N/N1003A-tk细胞的存活率低于对照组,差异有统计学意义(F=53 947.119,P<0.001).实验组GCV的IC50为2 mg/L,而对照组IC50为524 mg/L.GCV的杀伤效应随时间延长而增强,且存在明显的旁观者效应.N/N1003A-tk细胞在GCV作用下出现明显的细胞凋亡和坏死,细胞的凋亡率7.18%±2.04%,与对照组(3.50%±0.56%)比较差异有统计学意义(t=3.83,P<0.01);S期细胞比例明显增加,G0/G1期细胞比例明显减少,与对照组比较差异有统计学意义(S期细胞比例:t=3.55,P<0.01;G0/G1期细胞比例:t=4.29,P<0.01).结论 GCV可有效杀伤重组腺相关病毒rAAV2/HSV-tk转染的兔晶状体上皮细胞,并具有较强的旁观者效应.     

重组腺相关病毒介导的HSV-tk/GCV体系对兔晶状体上皮细胞的抑制作用

目的 探讨2型重组腺相关病毒(rAAV2)载体介导的单纯疱疹病毒胸苷激酶基因/丙氧鸟苷体系(HSV-tk/GCV)对体外培养兔晶状体上皮细胞(N/N1003A)的抑制作用,以及晶状体上皮细胞死亡的机制.方法 实验研究.rAAV2载体介导增强型绿色荧光蛋白基因(EGFP)转染体外培养N/N1003A细胞,倒置荧光显微镜观察细胞中EGFP的表达,流式细胞仪检测病毒的转染效率.重组病毒rAAV2/HSV-tk转染体外培养的N/N1003A细胞为实验组,以没有转染重组病毒的细胞作为对照组,MTT法检测HSV-tk/GCV体系对细胞作用的浓度依赖性、时间依赖性和旁观者效应;相差显微镜、透射电镜、Hoechst33258染色观察细胞凋亡、坏死改变,流式细胞仪检测细胞凋亡率和细胞周期的变化.不同浓度GCV对两组细胞的作用结果采用两因素析因设计的方差分析;两组细胞周期和凋亡的比较采用两样本t检验.结果 rAAV2载体能介导EGFP基因稳定高效转染N/N1003A细胞.GCV对两组细胞的杀伤作用有剂量-效应依赖关系(F=13 076.239,P<0.001);实验组N/N1003A-tk细胞的存活率低于对照组,差异有统计学意义(F=53 947.119,P<0.001).实验组GCV的IC50为2 mg/L,而对照组IC50为524 mg/L.GCV的杀伤效应随时间延长而增强,且存在明显的旁观者效应.N/N1003A-tk细胞在GCV作用下出现明显的细胞凋亡和坏死,细胞的凋亡率7.18%±2.04%,与对照组(3.50%±0.56%)比较差异有统计学意义(t=3.83,P<0.01);S期细胞比例明显增加,G0/G1期细胞比例明显减少,与对照组比较差异有统计学意义(S期细胞比例:t=3.55,P<0.01;G0/G1期细胞比例:t=4.29,P<0.01).结论 GCV可有效杀伤重组腺相关病毒rAAV2/HSV-tk转染的兔晶状体上皮细胞,并具有较强的旁观者效应.     

重组腺相关病毒介导的HSV-tk/GCV体系对兔晶状体上皮细胞的抑制作用

目的 探讨2型重组腺相关病毒(rAAV2)载体介导的单纯疱疹病毒胸苷激酶基因/丙氧鸟苷体系(HSV-tk/GCV)对体外培养兔晶状体上皮细胞(N/N1003A)的抑制作用,以及晶状体上皮细胞死亡的机制.方法 实验研究.rAAV2载体介导增强型绿色荧光蛋白基因(EGFP)转染体外培养N/N1003A细胞,倒置荧光显微镜观察细胞中EGFP的表达,流式细胞仪检测病毒的转染效率.重组病毒rAAV2/HSV-tk转染体外培养的N/N1003A细胞为实验组,以没有转染重组病毒的细胞作为对照组,MTT法检测HSV-tk/GCV体系对细胞作用的浓度依赖性、时间依赖性和旁观者效应;相差显微镜、透射电镜、Hoechst33258染色观察细胞凋亡、坏死改变,流式细胞仪检测细胞凋亡率和细胞周期的变化.不同浓度GCV对两组细胞的作用结果采用两因素析因设计的方差分析;两组细胞周期和凋亡的比较采用两样本t检验.结果 rAAV2载体能介导EGFP基因稳定高效转染N/N1003A细胞.GCV对两组细胞的杀伤作用有剂量-效应依赖关系(F=13 076.239,P<0.001);实验组N/N1003A-tk细胞的存活率低于对照组,差异有统计学意义(F=53 947.119,P<0.001).实验组GCV的IC50为2 mg/L,而对照组IC50为524 mg/L.GCV的杀伤效应随时间延长而增强,且存在明显的旁观者效应.N/N1003A-tk细胞在GCV作用下出现明显的细胞凋亡和坏死,细胞的凋亡率7.18%±2.04%,与对照组(3.50%±0.56%)比较差异有统计学意义(t=3.83,P<0.01);S期细胞比例明显增加,G0/G1期细胞比例明显减少,与对照组比较差异有统计学意义(S期细胞比例:t=3.55,P<0.01;G0/G1期细胞比例:t=4.29,P<0.01).结论 GCV可有效杀伤重组腺相关病毒rAAV2/HSV-tk转染的兔晶状体上皮细胞,并具有较强的旁观者效应.     

高糖诱导的人晶状体上皮细胞葡萄糖关键代谢酶的表达

目的：探讨葡萄糖关键代谢酶在高糖诱导的人晶状体上皮(HLEB3)细胞中的表达情况。

方法：将体外培养的HLEB3细胞分为正常对照组(采用DMEM培养液培养,含葡萄糖5mmol/L)、氧化应激组(采用含H₂O₂ 200μmol/L的DMEM培养液培养)、高糖诱导组(采用含葡萄糖30mmol/L的培养液培养),培养24h后检测细胞凋亡情况和细胞活力及6种葡萄糖关键代谢酶(6-磷酸果糖激酶-1、丙酮酸激酶、己糖激酶、柠檬酸合成酶、α-酮戊二酸脱氢酶、6-磷酸葡萄糖脱氢酶)的mRNA表达情况。

结果：高糖诱导HLEB3细胞凋亡,高糖诱导组(63.43%±3.40%)细胞活力低于正常对照组(100.00%±0.00%)和氧化应激组(91.90%±5.11%),且高糖诱导组细胞6种葡萄糖代谢关键酶的mRNA表达水平均低于正常对照组和氧化应激组(均P<0.05)。

结论：高糖可以诱导HLEB3细胞葡萄糖关键代谢酶的表达水平降低,诱导细胞凋亡,影响细胞活性。     

阿柏西普对体外培养的视网膜Müller细胞膜离子通道的影响

目的：探讨阿柏西普对体外培养的高糖环境下视网膜Müller细胞膜K⁺通道的影响。

方法：人Müller细胞分为3组：对照组(常规DMEM培养基培养)、高糖组(高糖DMEM培养基培养)、实验组(高糖DMEM培养基和100μmol/L 阿柏西普处理)。采用荧光探针检测细胞K⁺浓度,MTT法检测细胞存活率,流式细胞仪检测细胞凋亡率,Western blot法检测Müller细胞caspase-3蛋白水平。

结果：Müller细胞培养48h后呈现谷氨酰胺合成酶(GS)阳性,纯化度在90%以上。荧光检测显示对照组、高糖组、实验组K⁺相对浓度分别为(2.14±0.44)%、(23.11±4.39)%、(5.20±0.92)%,细胞存活率分别为(100.00±0.00)%、(73.24±4.13)%、(85.22±5.33)%,细胞凋亡率分别为(5.03±1.91)%、(26.73±3.14)%、(16.63±2.73)%(均P<0.05)。 与对照组相比,高糖组Müller细胞内caspase-3蛋白水平显著上升(P<0.05); 与高糖组Müller细胞相比,实验组Müller细胞内caspase-3蛋白水平显著降低(P<0.05)。

结论：阿柏西普可抑制体外培养的高糖环境下视网膜Müller细胞膜K⁺通道,抑制高糖诱导的Müller细胞凋亡,降低caspase-3蛋白表达水平,促进细胞增殖。     

Inhibition of human lens epithelial B-3 cell proliferation by adenovirus-mediated transfer of antisense c-myc construct

Purpose To investigate the effects of adenovirus-mediated transfer of antisense c-myc construct on human lens epithelial B-3 (HLE B-3) cell proliferation, apoptosis and cell cycle.Methods HLE B-3 cell cultures were transduced with replication-defective adenovirus bearing either a nuclear-targeted -galactosidase (Ad-lacZ) or an antisense c-myc construct (Ad-AS-myc). The presence of -galactosidase activity in the transduced cultures was detected by immunohistochemical X-Gal staining, while c-myc mRNA and protein expression levels were evaluated by RT-PCR and Western blot analysis. HLE B-3 cell proliferation within 96 h after the transduction was analyzed by cell counting and MTT colorimetric assay. Apoptosis and cell cycle of the HLE-B3 cells were examined by flow-cytometric analysis.Results The mean transduction efficiency was 80% for HLE B-3 cells. Downregulation of c-myc mRNA and protein expression was noticed at 48, 96 and 144 h after the transduction with Ad-AS-myc. Cytostatic effects of Ad-AS-myc in HLE B-3 cells were obvious within 96 h after the transduction. An increased incidence of apoptosis and G1-phase arrest was identified in the Ad-AS-myc-transduced HLE B-3 cells.Conclusions HLE B-3 cells were successfully transduced with adenovirus-mediated antisense c-myc construct. Ad-AS-myc transduction could significantly inhibit cell proliferation and induce cell apoptosis and G1-phase arrest in HLE B-3 cells. It may provide a novel approach for prevention of posterior capsular opacification.     

Mechanisms of inhibition of elemene on human lens epithelial cell proliferation in vitro

AIM: To study the effects of elemene (Ele) on proliferation and cell cycle of human lens epithelial cells B3 (HLE-B3) and the mechanisms of its signal transduction. METHODS: Recombinant human basic fibroblast growth factor (rhbFGF) was used to induce proliferation of HLE-B3 cells, which were incubated with 80mg/L Ele for 24 hours. The inhibitory effects of Ele on the proliferation of HLE-B3 cells were evaluated by MTT method. The effect of Ele on HLE-B3 cell cycle was analyzed by flow cytometry(FCM). The expressions of protein kinase A (PKA) and protein kinase G (PKG) of HLE-B3 were also analyzed by FCM. RESULTS: Ele altered the cell cycle of HLE-B3 and effectively inhibited HLE-B3 cell proliferation induced by rhbFGF. Ele up-regulated PKA and down-regulated the expression of PKG in HLE-B3 cell. CONCLUSION: Ele inhibits HLE-B3 proliferation, making it an attractive potential agent in regimens to treat after- cataracts.     

Thioltranferase mediated ascorbate recycling in human lens epithelial cells

PURPOSE: This study was undertaken to investigate whether thioltransferase (TTase) exhibits dehydroascorbate (DHA) reductase activity in human lens epithelial cells. METHODS: TTase was investigated for DHA reductase activity in vitro by the method of glutathione reductase-coupled spectrophotometric assay. DHA reductase activities of human lens epithelial (HLE-B3) cell lysate and TTase-depleted HLE-B3 cell lysate were determined with a 6-deoxy-6-fluoro-DHA probe and 19F-nuclear magnetic resonance (NMR) spectroscopy. TTase-overexpressing and -depleted HLE-B3 cells were investigated for DHA reductase activity. RESULTS: TTase showed DHA reductase activity at a Km of 0.15 mM and Vmax of 35 nmol/min. Investigation of the DHA reductase activity in human lens epithelial (HLE-B3) cell lysate, by using a 6-deoxy-6-fluoro-DHA probe and 19F-NMR spectroscopy, revealed that cell lysate possesses significant DHA reductase activity. This activity decreased extensively when TTase was depleted from the cell lysate by immunoprecipitation. In a cell-free system with externally added DHA, nearly 70% of the recycling ability was diminished when TTase was removed from the lysate. The TTase-overexpressing cells increased DHA reductase activity twofold. HLE-B3 cells showed an ability to take up and recycle DHA, and this ability was increased approximately twofold in the TTase-transfected cells. Suppression of TTase in HLE-B3 cells by an antisense cDNA strategy resulted in a 77% decrease in DHA reductase activity. CONCLUSIONS: The data provide evidence that TTase plays a major role in ascorbic acid recycling in human lens epithelial cells.     

慢病毒载体介导PAX6沉默引起HLE-B3细胞凋亡

目的:观察PAX6基因沉默后人晶状体上皮细胞系(HLE-B3)增殖的改变。方法:分别将4组PAX6 shRNA慢病毒载体及对照组慢病毒(pGCL-GFP-shRP1,2,3,4,NC)感染B3细胞;感染96h后,利用Real-time PCR和Western-blot检测B3细胞PAX6表达以确定PAX6沉默;选取有效沉默PAX6基因的pGCL-GFP-shRP4感染B3细胞,MOI=10,观察细胞数量变化。感染48h后采用流式细胞仪检测B3细胞凋亡情况。结果:感染RNAi病毒组的B3细胞,随感染时间延长,细胞数量减少。流式细胞仪检测结果显示沉默PAX648h的B3细胞,G1/G0期前出现凋亡峰。结论:慢病毒介导的RNA干扰能有效沉默B3细胞的PAX6表达;PAX6基因沉默后B3细胞凋亡。     

miR-124-3p靶向调控KLF6基因表达对H2O2诱导的人晶状体上皮细胞增殖和凋亡的影响

目的　探讨微小RNA-124-3p（miR-124-3p）对H₂O₂诱导的人晶状体上皮细胞增殖及凋亡的影响及其靶向调控 Krüppel样因子6(Krüppel like factor 6,KLF6)的机制。方法　按HLE-B3细胞处理方式的不同,将其分为HLE-B3组、HLE-B3+ H₂O₂组、HLE-B3+H₂O₂+miR-NC组、HLE-B3+H₂O₂+miR-124-3p组、HLE-B3+H₂O₂+si-NC组、HLE-B3+H₂O₂+si-KLF6组、miR-124-3p+pcDNA3.1组、miR-124-3p+pcDNA3.1-KLF6组。利用MTT实验检测各组HLE-B3细胞增殖活性,流式细胞仪检测各组HLE-B3细胞凋亡。双荧光素酶报告基因实验验证miR-124-3p与KLF6的靶向关系。Western blot检测各组HLE-B3细胞中Cyclin D1、P21、Bax、Bcl-2蛋白表达。结果　H₂O₂可抑制人晶状体上皮HLE-B3细胞中miR-124-3p的表达（HLE-B3组0.79±0.07、HLE-B3+H₂O₂组0.31±0.03）（P＜0.05）,而明显促进KLF6 的表达;miR-124-3p过表达或抑制KLF6表达可促进HLE-B3细胞增殖,抑制HLE-B3细胞凋亡（19.34±1.27、7.66±0.38;19.29±1.33、11.46±1.02）,促进Cyclin D1（0.39±0.04、0.89±0.08;0.39±0.04、0.74±0.07）、Bcl-2表达（0.29±0.03、0.74±0.07;0.29±0.03、0.60±0.06）,抑制P21（0.73±0.07、0.26±0.03;0.79±0.07、0.33±0.03）、Bax表达（0.86±0.08、0.37±0.03;0.86±0.08、0.51±0.05）。共转染miR-124-3p mimics与WT-KLF6可明显降低HLE-B3细胞的荧光素酶活性（0.27±0.03、0.98±0.08）（P＜0.05）;过表达KLF6可逆转miR-124-3p对H₂O₂诱导的人晶状体上皮细胞HLE-B3细胞增殖及凋亡的作用。结论　miR-124-3p可通过靶向调控 KLF6表达进而促进H₂O₂诱导的人晶状体上皮细胞HLE-B3细胞增殖并抑制其凋亡。     

榄香烯对人晶状体上皮细胞增生及细胞周期的影响

目的探讨中药单体榄香烯（Ele）对人晶状体上皮细胞株（HLE-B3）增生及细胞周期的影响。方法利用重组人碱性成纤维细胞生长因子（rhbFGF）诱导HLE-B3增生,将80mg/L的Ele作用在处于增生状态下的HLE-B324h后,四甲基偶氮唑蓝法（MTT）检测Ele对HLE-B3增生的抑制作用;苏木精-伊红染色观察Ele作用后HLE-B3细胞形态的改变;流式细胞术（FCM）检测Ele对HLE-B3细胞周期的影响。结果MTT检测显示：rhbFGF组HLE-B3吸光度值（0.5990±0.0531）较正常组（0.4091±0.0422）显著升高,Ele组HLE-B3吸光度值（0.4500±0.0614）较rhbFGF组显著降低,抑制率达24.90%（P〈0.01）。苏木精-伊红染色后光学显微镜下观察到rhbFGF组较正常组细胞数量增多,细胞形态清晰,胞浆丰富,胞核清晰,交织呈网状结构;Ele组细胞数量明显减少,胞浆减少,轮廓不清,交织的网状结构减少,甚至有的细胞变圆,细胞核凝集,见核固缩现象,胞浆嗜酸性染色。FCM检测细胞周期变化时发现：G1期的细胞在rhbFGF组（42.062%±1.270%）较正常组（46.422%±3.765%）减少（P〈0.05）,Ele组（60.665%±2.069%）较rhbFGF组明显增加（P〈0.01）;S期的细胞在rhbFGF组（51.647%±1.123%）较正常组（31.842%±2.798%）明显增加（P〈0.01）,Ele组（30.222%±3.429%）较rhbFGF组明显减少（P〈0.01）;G2期的细胞在rhbFGF组（6.288%±0.966%）较正常组（21.735%±3.806%）明显减少（P〈0.01）,Ele组（9.112%±1.659%）较rhbFGF组明显增加（P〈0.01）。结论Ele能通过改变HLE-B3细胞形态及细胞周期的进程而有效抑制rhbFGF诱导的HLE-B3增生,有望成为防治后发性白内障的理想药物。     

纤维连接蛋白对人晶状体上皮细胞系的增殖、黏附和移行的影响

目的:探讨纤维连接蛋白(fibronectin,FN)对人晶状体上皮细胞系HLE-B3的增殖、黏附和移行的影响及其受体整合素α5亚基的表达。方法:培养人晶状体上皮细胞系HLE-B3,接种于不同浓度的FN(0,10,20,40mg/L)包被的培养板中,倒置显微镜下观察HLE-B3的生物学特性,采用WST-8法检测细胞的增殖、黏附情况,划痕法观察细胞的移行并记录细胞缺损区闭合时间,免疫细胞化学法观察整合素α5亚基的表达。结果:各浓度FN包被后,增殖实验中WST-8法检测的吸光值增高不明显(P>0.05)。随FN包被浓度的增高,黏附实验中的吸光值逐渐增高,划痕实验中缺损区闭合的时间逐渐缩短,各浓度组在统计学上具有显著性差异。整合素α5亚基随FN包被浓度的增高表达增强(P<0.05)。结论:FN具有显著促进HLE-B3黏附和移行的作用,同时能上调其受体整合素α5亚基的表达。     

The effect of rigid gas permeable contact lens wear on proliferation of rabbit corneal and conjunctival epithelial cells.

PURPOSE: To study the effect of rigid contact lens oxygen transmissibility on cell proliferation of the corneal, limbal, and conjunctival epithelium in vivo following 2 days of extended wear in the rabbit model. METHODS: Fourteen adult New Zealand White rabbits were divided equally into two groups. Each group was assigned to one of two test rigid gas permeable (RGP) contact lenses (Dk/Ltotal = 10 and 97) with uniform thickness (0.15 mm) and diameter (14.0 mm). One eye of each rabbit randomly received a contact lens for two days (48 hrs) extended wear, and the fellow eye was used as a control. Rabbits were injected intravenously with 5-bromo-2-deoxyuridine (200 mg/kg) in sterile phosphate buffered saline (pH 7.4) 24 hours before being killed. Corneas with a limbal rim of episclera and overlying conjunctiva were fixed in situ and excised. Nuclei labeled with BrdU were detected with a monoclonal anti-BrdU antibody and an FITC-conjugated secondary antibody. Digital images were collected and BrdU-labeled nuclei of whole-mount corneas were counted from superior limbus to inferior limbus using epifluorescence microscopy. RESULTS: Twenty-four hours after intravenous injection of BrdU, labeled nuclei were confined to and appeared as pairs in the basal epithelial layer. The density of BrdU-labeled nuclei were found to be 258 +/- 42, 167 +/- 43, 372 +/- 64, and 310 +/- 46 (pairs/mm2, mean +/- SD, n = 14) in normal controls for adjacent conjunctiva, limbus, peripheral cornea, and central cornea, respectively. By contrast,there was significant 81.35% (low Dk)and 22.46% (ultra-high Dk) suppression of cell proliferation in the central cornea after two days lens wear (n = 7). In addition, significant increases in the labeling of limbal and conjunctival epithelium were also noted. CONCLUSIONS: Significantly less BrdU labeling of epithelial cells at the normal rabbit limbus was noted as compared to the peripheral and central cornea (P < 0.05) and is consistent with the presence of slow-cycling limbal basal cells and the limbal stem cell theory; however, this is the first report of up-regulation of limbal cell proliferation induced by contact lens wear. This study also revealed, for the first time, that short-term extended wear of RGP lenses inhibits central corneal epithelial cell proliferation. This effect was significantly more pronounced for a low-oxygen vs. a hyper-oxygen transmissible test lens. This data also suggests that corneal epithelial layer thinning seen following extended contact lens wear may be explained, in part, by suppression of basal epithelial cell proliferation. Further study is clearly necessary to validate and extend these preliminary findings.     

中药单体榄香烯体外对人晶状体上皮细胞内胶原蛋白合成的影响

目的:探讨中药单体榄香烯(effects of elemene,Ele)对人晶状体上皮细胞系(human lens epithelial cells B3,HLE-B3)内Ⅰ型胶原蛋白和Ⅲ型胶原蛋白合成的影响。方法:利用10μg/L碱性成纤维细胞生长因子(recombinant human basic fibroblast growth factor,rhbFGF)诱导HLE-B3增殖,将80mg/L的Ele作用在处于增殖状态下的HLE-B3,24h后采用双抗体夹心ABC-酶联免疫吸附测定法(enzyme-linked immunosorbent assay,ELISA)检测Ele作用后HLE-B3内Ⅰ型胶原蛋白和Ⅲ型胶原蛋白表达。结果:rhbFGF作用后HLE-B3内Ⅰ型胶原蛋白浓度为53.5±5.4μg/L,较正常组(38.5±2.3μg/L)明显升高,Ele作用后HLE-B3内Ⅰ型胶原蛋白的浓度为29.5±2.9μg/L,较rhbFGF组明显下降(P<0.01)。rhbFGF作用后HLE-B3内Ⅲ型胶原蛋白浓度为1.27±0.29μg/L,较正常组(0.83±0.12μg/L)明显升高,Ele作用后HLE-B3内Ⅲ型胶原蛋白的浓度为0.69±0.11μg/L,较rhbFGF组明显下降(P<0.01)。结论:Ele抑制rhbFGF诱导的HLE-B3增殖的同时也能抑制HLE-B3内Ⅰ,Ⅲ型胶原蛋白合成,干扰HLE-B3纤维化,可望成为防治后囊膜混浊的理想药物。