人晶状体上皮细胞HGF与c-Met的表达对增殖和凋亡的影响

目的：探讨肝细胞生长因子(hepatocyte growth factor,HGF)在人晶状体上皮细胞(lens epithelial cell,LEC)的表达及其对晶状体上皮细胞的促增殖和抑制凋亡的作用。方法：取原代培养人晶状体上皮细胞,应用RT-PCR,Western blot检测HGF,C-Met的mRNA及蛋白的表达,应用MTT法检测HGF对晶状体上皮细胞增殖的影响,Western-blot检测：Bcl-2的蛋白表达,以揭示其对晶状体上皮细胞凋亡的影响。结果：HGF和c-Met在人晶状体上皮细胞有表达,HGF有促进晶状体上皮细胞增殖的作用,并能抑制凋亡产生。结论：HGF参与人晶状体上皮细胞的增殖代谢过程,与晶状体上皮细胞的增殖相关。     

EGb761对H2O2诱导的晶状体上皮细胞增殖的影响

目的:观察银杏叶提取物(EGb761)对过氧化氢(H2O2)诱导的晶状体上皮细胞增殖细胞核抗原(PCNA)表达的影响。方法:将离体培养的SD大鼠的晶状体上皮细胞分成3组:实验组用H2O2 EGb761处理,对照组用H2O2处理,空白对照组未做任何处理。用免疫组化的方法检测上皮细胞PCNA表达,分析实验组、对照组和空白对照组的表达情况。结果:PCNA阳性细胞率:实验组由于EGb761的抑制作用,在3h为15.3±4.0(%),对照组在H2O2诱导下,3h增加至34.2±5.9(%),空白对照组仅为9.9±2.3(%)。结论:H2O2作用早期可引起晶状体上皮细胞增殖,EGb761在H2O2作用早期能减少氧化应激引起的细胞增殖。     

RGD肽对体外培养的人晶状体上皮细胞粘附与增殖的影响

目的:研究RGD肽对体外培养的人晶状体上皮细胞粘附与增殖的影响,为RGD肽防治晶状体后囊混浊提供理论依据。方法:将在体外分离培养的人晶状体上皮细胞中分别加入系列浓度的RGD肽(50,125,250,500,1000mg/L)作为实验组,不含RGD肽的培养基作为对照组。以2×107个/L密度接种到预孵化含有纤维连接蛋白和I型胶原蛋白的96孔培养板中,于1h后应用MTT法检测RGD肽对细胞粘附的影响。细胞接种于培养板,加入系列浓度RGD肽(125,250,500,1000,2000mg/L)后的24,48,72h检测对细胞增殖的影响。结果:RGD肽对人晶状体上皮细胞粘附的抑制呈明显的剂量依赖性,随着其浓度增大,细胞粘附数就越低,500mg/L时,抑制作用最强(P<0.05);RGD肽对人晶状体上皮细胞增殖的抑制呈明显的时间剂量依赖性,在48h,1000mg/LRGD条件下,对细胞的抑制作用最强。结论:RGD肽可抑制晶状体上皮细胞的粘附与增殖,具有潜在的防治后囊混浊的作用。     

r—tPA对兔眼晶状体上皮细胞影响的实验研究

目的研究体外细胞培养中基因重组的组织纤维蛋白溶解酶原激活物(recombinationtissueplasminigenactivator,r-tPA)对兔晶状体上皮细胞增殖的抑制作用及有效浓度,为晶状体后囊混浊的药物预防提供新线索.方法首先进行兔晶状体上皮细胞的原代与传代培养.传代培养的免晶状体上皮细胞分为6个实验组,分别加入2mg·L、4mg·L1、8mg·L1、16mg·L、32mg·L1的rtPA,设空白对照组,在加药后不同时间进行细胞计数,3HTDR掺入实验,研究rtPA对晶状体上皮细胞增殖的影响.结果rtPA对体外培养的兔晶状体上皮细胞的增殖有显著抑制作用,呈浓度依赖性改变.4mg·L…r-tPA已有显著抑制作用,16mg·     

EGCG抗兔晶状体上皮细胞增殖机制中p38激酶作用的研究

目的:研究p38激酶在绿茶提取物中的表没食子儿茶素没食子酸酯[(-)-Epigallocatechin-3-gallate,EGCG]抗晶状体上皮细胞增殖机制中的作用。 方法:用噻唑蓝比色法(MTT比色法)研究p38的特异性抑制剂SB203580对EGCG抑制晶状体上皮细胞增殖作用的影响;用Western Blot法研究EGCG对p38激酶的磷酸化和非磷酸化水平的影响。 结果:(1)预先加入25μmol/L,50μmol/L的SB203580孵育1h后,100μmol/L EGCG对晶状体上皮细胞增殖的抑制率低于对照组,但这种差别没有统计学上的意义(P>0.05);200μmol/L EGCG组对晶状体上皮细胞的抑制率低于对照组,有统计学的意义(P<0.05);(2)在晶状体上皮细胞,磷酸化的p38基础水平很低。p38的磷酸化水平随EGCG浓度的增加逐渐增加,而非磷酸化的p38的水平与基础水平一样保持不变。以200μmol/L EGCG作用15min来研究其对p38的磷酸化和非磷酸化影响的时-效规律发现,加药后初期,p38的磷酸化水平很高,随后逐渐下降。同时,非磷酸化p38的水平保持不变。 结论:(1)EGCG对晶状体上皮细胞的增殖抑制作用可能通过p38通路;(2)EGCG对p38影响主要在于调节蛋白激酶的磷酸化与去磷酸化水平,不影响总蛋白含量。眼科学报 2003;19:236-238。     

基质金属蛋白酶抑制剂对培养的人晶状体上皮细胞移行抑制作用的研究

目的 通过体外人晶状体囊袋模型的建立,探讨基质金属蛋白酶抑制剂GM6001对白内障患者术后晶状体上皮细胞移行的抑制作用及其对细胞活性的影响,以寻找一种安全有效地防治晶状体后囊膜混浊的药物.方法 本文为实验研究.16例供体人眼行模拟白内障手术,建立人晶状体囊袋培养模型,确认赤道部晶状体上皮细胞开始移行后,将晶状体囊袋置于不同浓度(1 μmol/L、10 μmol/L和100 μmol/L)的GM6001及其阴性对照液(100 μmol/L)中培养(每组4个囊袋).相差显微镜下分别测量培养10、20及30 d时各组晶状体上皮细胞在后囊膜移行的距离;酶联免疫吸附实验测定囊袋培养液中MMP-2和MMP-9的浓度.四甲基偶氮唑盐法(MTT)测定不同实验浓度GM6001对细胞活性的影响.多组间及组间计数资料的比较,采用随机区组设计的方差分析.结果 培养的人晶状体囊袋中赤道部晶状体上皮细胞第4天开始移行.GM6001明显抑制了晶状体上皮细胞在后囊膜的移行,呈剂量依赖性(F=53.79,P<0.01):实验第20天,10μmol/L GM6001组晶状体上皮细胞移行距离较对照组减少70%(P<0.01),100μmoL/L组减少98%(P<0.01);GM6001降低了MMP-2、MMP-9表达水平,浓度越高,抑制作用越明显(F=86.59,72.96;P<0.01):实验第20天,10 μmol/L GM6001组MMP-2和MMP-9表达水平较对照组均降低70%(P<0.01),100 μmol/LGM6001组MMP-2水平降低了90%(P<0.01),MMP-9水平降低了87%(P<0.01);MTT法显示,晶状体上皮细胞在GM6001中仍保持增殖活性,各处理浓度组光密度(A)值与对照组比较差异无统计学意义(F=0.62,P>0.05).结论 MMP抑制剂有效地抑制了体外囊袋培养的人晶状体上皮细胞在后囊膜的移行,且对细胞活性无明显影响.因此,MMP抑制剂可能对预防后囊混浊有一定作用.     

过氧化氢对人晶状体上皮细胞增生及VEGF表达的影响

目的:研究不同浓度的过氧化氢(H2O2)对体外培养的人晶状体上皮细胞增生及VEGF表达的影响。方法:体外培养的人晶状体上皮细胞系SRA01/04,在培养液中分别加入浓度为1,10,100nmol/L;1,10,100μmol/L和1mmol/L的过氧化氢处理40min,对照组无过氧化氢,随后在正常培养液中继续培养,在0,6,12和24h用MTT方法检测晶状体上皮细胞的增生活力;在24h用ELISA方法检测培养液上清中血管内皮生长因子(VEGF)的含量。结果:在培养液中加入1nmol/L~10μmol/L浓度的H2O2处理组,晶状体上皮细胞增生率(A值)随浓度较对照组明显增加,其中以10nmol/L最为明显;而100μmol/L,1mmol/L处理组,晶状体上皮细胞出现生长抑制。ELISA检测结果显示,1nmol/L~10μmol/L的过氧化氢刺激后,VEGF水平均高于对照组,且呈浓度依赖性,峰值出现在10nmol/L和10μmol/LH2O2处理组。结论:低浓度(1nmol/L~10μmol/L)的H2O2可以促进晶状体上皮细胞增殖,并使VEGF分泌增加;提示VEGF可能作为一种氧化应激产物,对晶状体上皮细胞起到保护、免受损伤的作用。     

bFGF诱导人晶状体上皮细胞增殖过程中细胞外信号调节激酶的作用

目的:检测细胞外信号调节激酶(extracellular regulated kinase,ERK)在碱性成纤维细胞生长因子(basic fibroblast growth factor,bFGF)诱导的人晶状体上皮细胞增殖过程中的表达与活化;检测ERK1/2特异性阻断剂PD98059对人晶状体上皮细胞增殖的影响。方法:人晶状体上皮细胞系SRA01/04体外培养,采用MTT比色法和[3H]-TdR掺入法检测ERK阻断剂PD98059对人晶状体上皮细胞活力和DNA合成的影响;Westernblot法测定bFGF对培养的人晶状体上皮细胞ERK,c-Jun氨基末端激酶(JNK),P38蛋白表达及PD98059对环氧合酶-2(COX-2)表达的影响。结果:10μg/LbFGF能显著刺激人晶状体上皮细胞增生,1μmol/LPD98059即能显著抑制bFGF启动的HLEC增殖,其效应呈浓度依赖性(P<0.01)。10μg/LbFGF可激活ERK信号通路,诱导COX-2蛋白表达,其效应在30min内达到高峰,6h后逐渐减弱,此作用可被10μmol/LPD98059阻断;10μg/LbFGF对非磷酸化ERK,磷酸化和非磷酸化JNK及P38表达无明显影响。结论:有丝分裂原活性蛋白激酶信号传导通路中ERK磷酸化对bFGF启动的人晶状体上皮细胞增殖具有重要的调节作用。     

维生素E琥珀酸酯对人晶状体上皮细胞增殖的影响

目的研究维生素E琥珀酸酯(vitamin E succinate,VES)对体外培养的人晶状体上皮细胞(HLECs)增殖的影响。方法人晶状体上皮细胞株HLECs-B3以VES刺激24h、48h、72h、96h,VES浓度为5μg/ml、10μg/ml和20μg/ml,用MTT比色法测定VES对细胞增殖的抑制作用;以流式细胞仪分析细胞周期。结果VES对人晶状体上皮细胞的增殖具有显著的抑制作用,表现为时间和剂量依赖关系。并且将细胞周期阻滞于G0/G1期。结论VES对体外培养的人晶状体上皮细胞的增殖具有抑制作用,为临床筛选防治后发性白内障的药物提供依据。     

地塞米松对体外大鼠晶状体上皮细胞增殖与分化的影响

目的:探讨地塞米松对大鼠晶状体上皮细胞增殖与分化的影响以及异常增殖与分化在激素性白内障形成中的作用。方法:对大鼠晶状体上皮细胞进行原代培养,应用不同浓度的地塞米松作用于2代上皮细胞24h,采用MTT方法检测地塞米松对上皮细胞增殖的影响,采用RT-PCR和Westernblotting方法,在转录及蛋白水平检测晶状体上皮细胞分化标志蛋白(β-晶状体蛋白)表达的变化,了解地塞米松对上皮细胞分化的影响。结果:地塞米松在一定范围内对晶状体上皮细胞有促进增殖的作用,其增殖率分别为10-8mol/L组131.9%,10-7mol/L组142.5%,10-6mol/L组183.4%;地塞米松在转录及蛋白水平可降低晶状体上皮细胞中β-晶状体蛋白的表达,在转录水平的表达分别为对照组2.07±0.26,10-8mol/L组1.48±0.07,10-7mol/L组1.06±0.16,10-6mol/L组0.78±0.16,在蛋白水平的表达分别为对照组1.38±0.16,10-8mol/L组1.07±0.11,10-7mol/L组0.97±0.04,10-6mol/L组0.62±0.12,说明地塞米松对晶状体上皮细胞的分化有抑制作用。结论:地塞米松对晶状体上皮细胞促进增殖和抑制分化的作用可能在激素性白内障形成机制中有一定的作用。     

Hepatocyte growth factor induces proliferation of lens epithelial cells through activation of ERK1/2 and JNK/SAPK

PURPOSE: Posterior capsule opacification (PCO) is caused by proliferation and migration of lens epithelial cells (LECs) remaining after cataract surgery. In this study, the effect of HGF in LECs and the signaling pathways that contribute to HGF-induced proliferation were investigated. METHODS: Capsular bags prepared from porcine eyes were maintained in serum-free DMEM. The human lens epithelial B3 cells (HLE B3) and rat lens epithelial explants were cultured in MEM supplemented with 20% FCS and medium 199 with 0.1% BSA, respectively. Cell proliferation was determined by MTT assay, proliferating cell nuclear antigen (PCNA) expression, or flow cytometry. An antisense oligonucleotide was used to inhibit cyclin D1 expression. Activation of the mitogen activated protein kinase (MAPK) and phosphatidylinositol 3-kinase (PI3K) pathways was detected by immunoblot analysis. RESULTS: The proliferation of LECs in a capsular bag culture was significantly inhibited by treatment with the neutralizing antibody for HGF receptor. Stimulation of HLE B3 with hepatocyte growth factor (HGF) activated the MAPKs, ERK, and JNK/SAPK, but not p38. Activation of both ERK and JNK/SAPK was necessary for the HGF-stimulated induction of cyclin D1, which in turn was necessary for the HGF-induced proliferation of LECs. PI3K also participated in the regulation of cyclin D1 expression upstream of ERK and JNK/SAPK. CONCLUSIONS: The data indicate that HGF is a potent growth factor for LECs and may contribute to the development of PCO and suggest that the signaling pathways involved in HGF-stimulated proliferation may constitute potential therapeutic targets in the treatment of PCO.     

Cross talk between c-Met and epidermal growth factor receptor during retinal pigment epithelial wound healing

PURPOSE: The authors sought to determine how hepatocyte growth factor (HGF) receptor c-Met and epidermal growth factor receptor (EGFR) cross talk in response to injury in human ARPE-19 cells. METHODS: A scratch wound was made on a cell monolayer of ARPE-19 cells using a sequence-comb or a pipet tip, and it was allowed to heal in the presence or absence of HGF and heparin-binding EGF-like growth factor (HB-EGF). The activation of EGFR was analyzed by immunoprecipitation with EGFR antibody, followed by Western blotting with phosphotyrosine-specific antibody. Phosphorylation of extracellular signal-regulated kinase (ERK) and AKT (a major substrate of phosphatidylinositol 3'-kinase (PI3K) was assessed by Western blotting. The release of c-Met ectodomain into the culture media was determined by Western blotting using an antibody against the extracellular region. Cell migration was assessed by Boyden chamber migration assay. RESULTS: ARPE-19 cells underwent spontaneous wound healing in basal medium, and exogenously added HB-EGF and HGF significantly enhanced wound closure. Basal and growth factor-enhanced wound closures were attenuated but not slowed by hydroxyurea, a cell proliferation inhibitor. RPE cells expressed all four erbBs, and wounding induced EGFR transactivation and downstream ERK and PI3K phosphorylation in ARPE-19 cells. HGF also induced EGFR tyrosine phosphorylation. The EGFR kinase inhibitor AG1478 blocked wound- and HGF-stimulated EGFR transactivation and attenuated spontaneous and growth factor-induced wound closure. Wounding and EGFR ligands induced the release of c-Met into the culture media. Moreover, pretreatment of cells with HB-EGF impaired ARPE-19 migration toward HGF in a matrix metalloproteinase inhibitor-sensitive manner. CONCLUSIONS: EGFR modulates HGF/c-Met activity by inducing c-Met ectodomain shedding, and HGF/c-Met transactivates EGFR, leading to an enhanced activation of downstream signaling pathways. Cross talk between EGFR and c-Met may play a key role in regulating RPE cell migration, proliferation, and wound healing.     

碱性成纤维细胞生长因子反义寡核苷酸及其脂质体对体外培养的大鼠晶状体上皮细胞增殖的抑制作用

目的 探讨碱性成纤维细胞生长因子(bFGF)反义寡核苷酸及其脂质体对大鼠晶状体上皮细胞(LEC)增殖的抑制作用。方法 体外培养大鼠LEC,细胞传代后分别加入bFGF反义和正义寡核苷酸及其脂质体,以营养液和无药脂质体为对照培养24 h后,用噻唑蓝(MTT)法测定细胞的增殖情况,用逆转录聚合酶链反应(RT-PCR)法测定细胞bFGF mRNA的表达情况。结果 大鼠LEC原代培养24 h可见细胞生长,形态为多边形,培养2-3周细胞汇合成片;传代培养细胞可在1～2周汇合成片。MTT法测定显示,bFGF反义寡核苷酸组(Ⅰ组)、正义寡核苷酸组(Ⅱ组)及营养液组(Ⅴ组)的吸光度(A值)分别为0.138±0.074、0.325±0.097及0.370±0.079,Ⅰ组A值显著小于Ⅱ和Ⅴ组(P=0.024,0.005);bFGF反义寡核苷酸脂质体组(Ⅲ组)、正义寡核苷酸脂质体组(Ⅳ组)及无药脂质体组(Ⅵ组)的A值分别为0.128±0.032、0.258±0.120及0.348±0.017,Ⅲ组A值显著小于Ⅵ组(P=0.000)。RT-PCR法检测结果显示,以2μg总RNA为模板,循环30次,bFGF反义寡核苷酸、bFGF正义寡核苷酸及营养液的扩增产物的量分别为0.33、0.99及0.85μg;:bFGF反义寡核苷酸脂质体、bFGF正义寡核苷酸脂质体及无药脂质体的扩增产物的量分别为0.23、0.48及0.56μg。结论大鼠LEC可在体外培养;bFGF反义寡核苷酸及其脂质体可     

Role of HGF/c-Met in serum-starved ARPE-19 cells

PURPOSE: Hepatocyte growth factor (HGF) and its receptor (HGFR/c-Met) regulate motility, mitogenesis, and morphogenesis in a cell type-dependent fashion. We report the role of HGF and c-Met on stress-induced ARPE-19 human retinal pigment epithelial (RPE) cells in this study. METHODS: The cells were cultured either with or without serum. Southern and Western blot analyses were done to determine the expression patterns of HGF/c-Met in serum-starved ARPE-19 cells. The cell proliferation pattern in serum-starved condition was analyzed using MTS assay. Inhibition level of cell proliferation was analyzed using a neutralizing monoclonal antibody against c-Met (2 microg/ml). RESULTS: Abnormal cell proliferation and scattering of ARPE-19 cells was observed under serum starvation. HGF/c-Met were expressed in serum-starved ARPE-19 cells. ARPE-19 cell proliferation was also enhanced with recombinant HGF treatment. Neutralization against c-Met inhibited the proliferation of serum-deprived ARPE-19 by 64.5% (n=9, S.D. 5.5%). Serum starvation appears to induce epithelial-mesenchymal transition of ARPE-19 cells, resulting in scatter, and the expression of alpha-smooth muscle actin (alpha-SMA), a marker for fibrosis. CONCLUSIONS: In conclusion, c-Met induced under non-physiologic conditions has significant effects on the activation of RPE cells.     

木犀草素调控Nrf2/HO-1通路保护视网膜色素上皮细胞氧化损伤

目的:探讨木犀草素对H2O2诱导的视网膜色素上皮(RPE)细胞氧化损伤的保护作用及其机制。方法:将ARPE-19细胞分为对照组、H2O2组、不同剂量木犀草素组和Nrf2抑制剂组,除对照组外均采用100μmol/L H2O2制备RPE氧化损伤模型。采用四甲基偶氮唑盐(MTT)法检测细胞活力并确定木犀草素处理浓度,采用流式细胞仪检测细胞凋亡率及活性氧(ROS)含量,采用试剂盒法检测细胞中丙二醛(MDA)和超氧化物歧化酶(SOD)含量,采用Western blot检测细胞Caspase-3、多聚腺苷酸二磷酸核糖聚合酶(PARP)、B细胞淋巴瘤-2(Bcl-2)、核因子E2相关因子2(Nrf2)及血红素氧化酶-1(HO-1)蛋白表达水平。结果:100μmol/L木犀草素对ARPE-19具有毒性作用,因此选择25μmol/L和50μmol/L木犀草素进行后续实验。与H2O2组比较,25μmol/L和50μmol/L木犀草素组细胞活力明显升高,凋亡率降低,ROS和MDA含量明显减少,SOD活性明显升高,Caspase-3和PARP蛋白表达水平明显降低,Bcl-2、Nrf2及HO-1蛋白表达水平明显升高(P<0.05)。与50μmol/L木犀草素组比较,Nrf2抑制剂组细胞活力明显降低,凋亡率明显升高,ROS和MDA含量明显升高[(654.96±26.99)vs(446.52±29.42),(3.89±0.29)nmol/mL vs(2.06±0.19)nmol/mL],SOD活性明显降低[(13.83±1.49)U/mL vs(22.69±1.83)U/mL],Caspase-3和PARP蛋白表达水平明显升高,Bcl-2、Nrf2及HO-1蛋白表达水平明显降低(P<0.05)。结论:木犀草素能够改善H2O2诱导的RPE细胞氧化损伤,其作用机制与激活Nrf2/HO-1通路有关。     

Suppression of human lens epithelial cell proliferation by proteasome inhibition, a potential defense against posterior capsular opacification

PURPOSE: Posterior capsular opacification (PCO) is caused by the proliferation, migration, and epithelial-mesenchymal transition (EMT) of the remaining lens epithelial cells (LECs) after cataract surgery. Studies have shown that proteasome inhibition interferes with EMT and remodeling of the extracellular matrix. This study was conducted to investigate suppression of LEC proliferation by proteasome inhibition and its signaling pathway. METHODS: HLE B-3 cells and human lens epithelium explants from 17- to 20-week fetal lenses were cultured and treated with TGF-beta2 (1 or 10 ng/mL), FGF-2 (20 or 50 ng/mL), HGF (10 ng/mL) and 5 or 10 muM MG132. LEC proliferation was determined using both the WST-1 reagent and proliferating cell nuclear antigen (PCNA) expression. Protein expression was observed by Western blot analysis. Transfection with p21/p27 siRNA was performed to evaluate the mechanism of the antiproliferative effect of proteasome inhibition. RESULTS: TGF-beta2 suppressed proliferation of HLE B-3 cells, whereas FGF-2 and HGF enhanced proliferation. Proliferation suppression by TGF-beta2 was blocked by adding FGF-2 or HGF. Proteasome inhibitor (MG132) treatment strongly inhibited the proliferation of LECs, either alone or in the presence of TGF-beta2, FGF-2, or HGF. These findings were confirmed by observing PCNA expression. Similar results were obtained with primary human LECs. Expression of cell cycle regulatory proteins was determined to evaluate the mechanism of the antiproliferative activity of proteasome inhibition. MG132 caused a significant increase in p21 and p27 protein and decrease in CDK2, but no change in p53, p57, CDK4, or CDK6 protein. The antiproliferative effect of MG132 was significantly reversed in samples transfected with p21 and p27 siRNA, which reduced p21 and p27 protein expression to very low levels that remained below basal control levels, even after treatment with MG132. CONCLUSIONS: Proteasome inhibition decreases the proliferation of LECs in the presence or absence of TGF-beta2, FGF-2, and HGF. This process is mediated in part by an increase in p21 and p27 proteins. These findings suggest that proteasome inhibitors are good candidates for blocking development of PCO.     

微小RNA-133b对紫外线诱导的晶状体上皮细胞凋亡的抑制作用及其调控机制

背景 研究证实紫外线B照射是白内障发生的主要原因之一,其机制与晶状体上皮细胞(LECs)凋亡有关.微小RNA-133b(miR-133b)参与氧化应激诱导的LECs凋亡的调控过程,但其是否参与紫外线诱导白内障的发病过程及其机制尚未阐明. 目的 观察miR-133b对紫外线诱导白内障LECs凋亡的抑制作用及其调控机制.方法 将20只8周龄SPF级C57 BL/6小鼠采用随机数字表法分为白内障模型组和正常对照组,其中白内障模型组小鼠用波长302 nm的紫外线直接照射眼部5 min,照射强度为300 W/cm2,每天照射1次,共照射1周;正常对照组小鼠不给于任何干预.于末次照射后24 h处死各组小鼠并摘出10只眼球以制备全眼球切片.取人LECs细胞系(SRA01/04)紫外线照射25 min,并继续培养4h作为紫外线照射组,正常对照组细胞不作任何干预.取紫外线照射模型组细胞接种于96孔板并分为miR-133b模拟物组、模拟物阴性对照组、miR-133b抑制物组和抑制物对照组,分别用lipofectamine2000联合50 nmol/L miR-133b模拟物、miR-133b模拟物对照剂、100 nmol/L miR-133b抑制物或miR-133b抑制物对照剂瞬时转染细胞.采用实时荧光定量PCR法检测小鼠晶状体组织和不同转染组入LECs中miR-133b mRNA及其预测靶基因BCL2L2mRNA的表达以评估转染效率;采用TUNEL凋亡检测试剂盒检测小鼠晶状体组织中LECs和不同转染组人LECs的凋亡情况.结果 正常对照组小鼠晶状体前囊膜LECs排列规则,未发现TUNEL染色阳性细胞,白内障模型组小鼠LECs排列稀疏,可见凋亡细胞呈红色荧光.紫外线照射组细胞凋亡率为(43.90±9.30)％,明显高于正常对照组的(1.08±0.49)％,差异有统计学意义(t=-7.963,P=0.015).白内障模型组小鼠晶状体组织和紫外线照射组细胞中miR-133b mRNA的相对表达量分别低于正常对照组小鼠和正常人LECs,差异均有统计学意义(t=-2.958,P=0.042;t=-6.195,P=0.003).白内障模型组小鼠晶状体组织和紫外线照射组细胞中BCL2L2 mRNA的相对表达量分别高于正常对照组小鼠和正常人LECs,差异均有统计学意义(t=3.761,P=0.020;t 12.437,P=0.000).miR-133b模拟物组人LECs中miR-133b mRNA的相对表达量明显高于miR-133b模拟物对照组,而BCL2L2 mRNA的相对表达量明显低于miR-133b模拟物对照组,差异均有统计学意义(t=10.883、-5 927.617,均P＜0.01);miR-133b抑制物组人LECs中miR-133b mRNA的相对表达量明显低于miR-133b抑制物对照组,而BCL2L2 mRNA的相对表达量明显高于miR-133b抑制物对照组,差异均有统计学意义(t=-1 606.622、17.556,均P＜0.01).miR-133b模拟物组LECs凋亡率明显低于miR-133b模拟物对照组[(17.55±4.24)％与(43.62±9.19)％],miR-133b抑制物组LECs凋亡率为(78.23±12.42)％,明显高于miR-133h抑制物对照组的(48.01±9.68)％,差异均有统计学意义(t=-4.462,P=0.011;t=3.324,P=0.029).结论 miR-133b可防止紫外线照射所致的白内障的形成,其机制可能与靶向负性调控BCL2L2基因从而调控LECs的凋亡过程有关.     

RGDRGD肽对人晶状体上皮细胞黏附与增生作用的影响

背景RGD肽是一类含有精氨酸-甘氨酸-天冬氨酸的小分子多肽,其在抑制肿瘤细胞黏附、转移和肿瘤新生血管的生成中起重要作用。研究证实RGD肽能够抑制晶状体上皮细胞（LECs）的黏附和增生,RGDRGD肽串联起来作用增强。目的研究RGDRGD肽对体外培养的人LECs黏附与增生的影响,并与RGD肽的作用进行比较。方法将在体外分离培养的LECs中分别加入250、500、1000mg／L的RGDRGD肽和RGD肽作为实验组,仅加入细胞培养液作为对照组。将LECs以2×10。／ml密度接种到含有纤维连接蛋白（FN）和I型胶原蛋白预孵化的96孔培养板中,培养1h后用MTT比色法检测RGDRGD肽与RGD肽对细胞黏附率的影响。将LECs接种于培养板,分别加入250、500、1000、2000mg／L的RGDRGD肽和RGD肽培养24、48、72h,检测RGDRGD肽和RGD肽对LECs增生的影响。结果RGDRGD肽对人LECs黏附率的抑制呈明显的剂量依赖性,随着其质量浓度的增加,对细胞黏附的抑制作用越强,500mg／L的RGDRGD肽比RGD肽抑制人LECs黏附的作用更强（P〈0．01）。RGDRGD肽对人LECs增生的抑制呈明显的时间剂量依赖性,1000mg／L的RGDRGD肽作用48h比RGD肽对人LECs增生的抑制作用更强（P〈0．01）。结论RGDRGD肽抑制LECs黏附与增生的作用强于RGD肽,为进一步临床应用提供了理论依据。     

Inhibition of cell proliferation, migration and apoptosis in blue-light illuminated human retinal pigment epithelium cells by down-regulation of HtrA1

AIM: To investigate the effect of HtrA1 on the proliferation, migration and apoptosis of human retinal pigment epithelium (RPE) cells in the light injured model, as well as the expression of the apoptosis related molecules. METHODS: The human RPE cell line ARPE-19 was exposed to blue light to establish the light injured model. The cells were transfected with HtrA1 siRNA to knockdown HtrA1 expression. Subsequent expression of HtrA1 was determined by real-time polymerase chain reaction (RT-PCR) and Western blot, respectively. Changes in cell proliferation, migration and apoptosis were assessed by cell counting kit-8 (CCK-8), Transwell assay and flow cytometry respectively, as well as changes in the mRNA and protein levels of Bax, Caspase-3 and Bcl-2 expression. RESULTS: HtrA1 was highly expressed in ARPE-19 cells after blue light irradiation. Knockdown of HtrA1 expression inhibited the proliferation, migration and apoptosis of the blue-light-irradiated ARPE-19 cells (P<0.05). Bax and Caspase-3 expression were significantly reduced both at mRNA and protein levels (P<0.05) after siRNA treatment. Bcl-2 expression significantly increased in blue-light-irradiated ARPE-19 cells after siRNA interference (P<0.05). CONCLUSION: Silence of HtrA1 may inhibit the proliferation, migration and apoptosis of ARPE-19 cells in light injured model. Moreover, HtrA1 suppression in blue-light-irradiated ARPE-19 cells may ameliorate cell apoptosis through down-regulation of Bax and Caspase-3, and up-regulation of Bcl-2 expression.     

多西他赛对人晶状体上皮细胞的抑制作用

背景一些已知的抑制人晶状体上皮细胞（LECs）增生的药物由于严重的不良反应限制了其临床应用，寻找高效、安全的抑制LECs增生的药物是防治晶状体后囊膜混浊（PCO）的研究热点。目的探讨多西他赛对LECs增生的影响，并与盐酸表柔比星、盐酸吡柔比星和雷替曲塞的作用进行比较。方法对永生系人LECs细胞株SRAOI／04进行培养及传代，将不同浓度的多西他赛、盐酸表柔比星、盐酸吡柔比星和雷替曲塞加入LECs中分别作用24、48、72h，以MTT法评价不同浓度的多两他赛对人LECs增牛的抑制作用并与其他药物进行比较。用流式细胞术分析不同浓度的多西他赛作用48h后对LECs细胞周期的影响，采片jAnnexinV-FITC／PI标记法和蛋白印迹分析法评估不同浓度的多西他赛作用48h后LECs细胞bcl-2蛋白的表达和凋亡情况。结果8～519pmol／L多西他赛组LECs的增生率为100％，LECs形态正常，而66nmol／L多西他赛组干预48h和72h后LECs的增生率分别为34．7％和27．4％，LECs形态出现异常。23．22～523．56μmol／L雷替曲塞对人LECs的增生无明显抑制作用。多西他赛作用48h和72h时，半数抑制量（IC50）明显低于盐酸吡柔比星和盐酸表柔比星。多西他赛作用LECs48h后，随着多西他赛浓度的增高，处于G2／M期的LECs百分数明显增加，各组的总体差异有统计学意义（F=2633．05，P〈0．01）；8．3nmol／L和266nmol／L多西他赛浓度组干预48h后，LECs的凋亡率分别为22．4％和27．9％，较细胞对照组升高，差异均有统计学意义（χ2=20．00，P〈0．01；χ2=42．68，P〈0．01）。Westernblot检测表明不同浓度多西他赛干预后bcl-2蛋白在LECs中的表达条带均较对照组淡，8．3nmol／L多西他赛组bcl-2蛋白表达降低更为明显。结论多西他赛、盐酸表柔比星和盐酸吡柔比星均可抑制人LECs的增生，而雷替曲塞对人LECs的增生无明显的抑制作用。多西他赛对LECs增生的抑制作用强于其他药物，其作用强度呈浓度和时间依赖性。