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TIMP-1 Production in Human Retinal Pigment Epithelial Cells after Laser Exposure

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Eye Science 2005年第1期21卷 31-37页

作者： Alvin K.H.Kwok Timothy Y.Y.Lai hin-fai yam Chi-Pui Pang Department of Ophthalmology & Visual Sciences Department of Ophthalmology & Visual SciencesDepartment of Ophthalmology & Visual SciencesDepartment of Ophthalmology & Visual Sciences The Chinese University of Hong KongHong Kong SAR Department of OphthalmologyHong Kong Sanatorium and HospitalHong Kong SARThe Chinese University of Hong KongHong Kong SARThe Chinese University of Hong KongHong Kong SARThe Chinese University of Hong KongHong Kong SAR

Purpose: To investigate changes in the production of tissue inhibitor of metalloproteinase type 1 (TIMP-1) by human retinal pigment epithelial (RPE) cells following argon laser ***: Human cultured ARPE19 cells were exposed to argon green laser at four different energy levels ranging from 60mW to 360mW. After laser exposure, the culture media were sampled at 0, 24, 72 and 144 hours for TIMP-1 concentration produced by the RPE cells. The levels of TIMP-1 in the cells treated with different laser energy levels were compared with a control group not exposed to laser *** for proliferating cell nuclear antigen (PCNA) was performed to detect any adverse effects on the RPE cells caused by laser ***: Immediately after laser exposure, the concentration of TIMP- 1 was not detectable. At 24 hours after laser exposure, the concentration of TIMP-1 increased significantly in RPE cells treated with 120mW and 240mW at 24 hours (P=0.006 and P=0.001respectively) compared with control cells. At 72 hours after treatment, RPE cells treated at 120mW, 240mW and 360mW demonstrated significantly increase in TIMP-1production compared with control (P=0.003, P ＜ 0.001 and P ＜ 0.001, respectively).No significant reduction in cell viability was observed following laser application as detected by PCNA ***: Our results demonstrated that early TIMP-1 production by RPE cells in cell cultures was enhanced following laser exposure.

关键词： TIMP-1 视网膜上皮细胞激光损伤免疫细胞学视色素

Comparison of Dextran Perfusion and GSI-B4 Isolectin Staining in a Mouse Model of Oxygen-induced Retinopathy

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Eye Science 2015年第2期30卷 70-74页

作者： Shaofen Huang Jiajian Liang Gary hin-fai yam Zhihao Lu Chi Pui Pang Haoyu Chen Joint Shantou International Eye Center Shantou University & Chinese University of Hong Kong Singapore Eye Research Institute Department of Ophthalmology and Visual Sciences Chinese University of Hong Kong

Purpose: Oxygen-induced retinopathy(OIR) is a robust and widely used animal model for the study of retinal neovascularization(NV). Dextran perfusion and Griffonia simplicifolia isolectin B4(GSI-B4) staining are two common methods for examining the occurrence and extent of OIR. This study provides a quantitative comparison of the two for OIR ***: At postnatal day 7(PN7), fifteen C57 BL / 6J mice were exposed to a 75% hyperoxic condition for 5 days and then returned to room air conditions. At PN17, the mice received intravitreal injection of GSI-B4 Alexa Fluor 568 conjugate. After 10 hours, they were infused with FITC-dextran conjugate via the left ventricle. Retinal flat mounts were photographed by confocal microscopy. Areas with fluorescent signals and the total retinal areas were quantified by Image J ***:Both GSI-B4 and dextran detected the peripheral neovascular area. The mean hyper fluorescence area was 0.33 ±0.14% of whole retinal area determined by GSI-B4 staining and 0.25±0.28% determined by dextran perfusion. The difference between the two measures was 0.08%(95% CI:-0.59%,0.43%)..The Pearson correlation coefficient between the two methods was 0.386,P =0.035..The mean coincidence rates were 14.3 ±13.4% and 24.9 ±18.5% for GSI-B4 and dextran staining, ***:.Both methods can complement each other indemonstrating and quantitatively evaluating retinal NV. A poor agreement was found between the two methods;.GSI-B4 isolectin was more effective than FITC-dextran perfusion in evaluating the extent of retinal NV in a mouse model of OIR.

关键词：右旋糖酐小鼠模型视网膜凝集素染色灌注高氧病变

The anti-scarring effect of corneal stromal stem cell therapy is mediated by transforming growth factorβ3

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Eye and Vision 2020年第1期7卷 512-525页

作者： Lin Weng James L.Funderburgh Irona Khandaker Moira L.Geary Tianbing Yang Rohan Basu Martha L.Funderburgh Yiqin Du Gary hin-fai yam Department of Ophthalmology University of Pittsburgh School of medicine203 Lothrop StreetPittsburghPA 15213USA Shanghai Lanhe Optometry and Ophthalmology Clinic Shanghai 200032People’s Republic of China

Background:Corneal stromal stem cells(CSSC)reduce corneal inflammation,prevent fibrotic scarring,and regenerate transparent stromal tissue in injured *** effects rely on factors produced by CSSC to block the fibrotic gene *** study investigated the mechanism of the scar-free regeneration ***:Primary human CSSC(hCSSC)from donor corneal rims were cultivated to passage 3 and co-cultured with mouse macrophage RAW264.7 cells induced to M1 pro-inflammatory phenotype by treatment with interferonγand lipopolysaccharides,or to M2 anti-inflammatory phenotype by interleukin-4,in a Transwell *** timecourse expression of human transforming growth factorβ3(hTGFβ3)and hTGFβ1 were examined by immunofluorescence and ***β3 knockdown for>70%in hCSSC[hCSSC-TGFβ3(si)]was achieved by small interfering RNA ***ïve CSSC and hCSSC-TGFβ3(si)were transplanted in a fibrin gel to mouse corneas,respectively,after wounding by stromal *** clarity and the expression of mouse inflammatory and fibrosis genes were ***:hTGFβ3 was upregulated by hCSSC when co-cultured with RAW cells under M1 *** of hCSSC to wounded mouse corneas showed significant upregulation of hTGFβ3 at days 1 and 3 post-injury,along with the reduced expression of mouse inflammatory genes(CD80,C-X-C motif chemokine ligand 5,lipocalin 2,plasminogen activator urokinase receptor,pro-platelet basic protein,and secreted phosphoprotein 1).By day 14,hCSSC treatment significantly reduced the expression of fibrotic and scar tissue genes(fibronectin,hyaluronan synthase 2,Secreted protein acidic and cysteine rich,tenascin C,collagen 3a1 andα-smooth muscle actin),and the injured corneas remained ***,hCSSC-TGFβ3(si)lost these anti-inflammatory and anti-scarring functions,and the wounded corneas showed intense ***:This study has demonstrated that the corneal regenerative effect of hCSSC is mediated by TGFβ3,inducing a s

关键词： Cornea wound healing Corneal stromal stem cells TGFβ3 Inflammation Fibrosis

色素上皮细胞衍生因子:一种高效的新生血管抑制因子

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眼科新进展 2002年第1期22卷 68-70页

作者：金姬关明 hin-fai yam 321000 浙江省金华市中心医院眼科 200040 上海市华山医院检验科香港中文大学眼科与视觉科学系

色素上皮细胞衍生因子 (pigm ent epithelium- derived factor,PEDF)是最先在视网膜色素上皮细胞培养液中发现的细胞因子 ,属于丝氨酸蛋白酶抑制剂基因家族 ,但不具备抗蛋白酶活性。 PEDF有营养神经效果 ,保护神经元免受快速神经毒性侵... 详细信息

色素上皮细胞衍生因子 (pigm ent epithelium- derived factor,PEDF)是最先在视网膜色素上皮细胞培养液中发现的细胞因子 ,属于丝氨酸蛋白酶抑制剂基因家族 ,但不具备抗蛋白酶活性。 PEDF有营养神经效果 ,保护神经元免受快速神经毒性侵害 (如谷氨酸毒性 )作用及“胶质细胞静息”特性。PEDF还能抑制血管内皮细胞移行 ,促进血管内皮细胞凋亡 ,正常角膜、玻璃体中PEDF含量较高 ,在低氧环境中降低。PEDF具有抗新生血管诱导因子的作用 ,目前 PEDF被视为最有效的细胞内新生血管抑制因子之一。可能对治疗神经元损伤和抑制血管生成特别有效。

关键词：神经营养因子色素上皮细胞衍生因子血管增生

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复方丹参、葛根辅助治疗冠心病的疗效研究

岭南心血管病杂志 2011年第1期17卷 48-52页

作者：续平谭颖贤陈莲娣乔木郑景辉潘荫球冯国培梁秉中胡锦生香港中文大学中医中药研究所香港中文大学内科及药物治疗学系

目的评估丹参加葛根作为辅助治疗药物对冠状动脉粥样硬化性心脏病(冠心病)二级预防的疗效及安全性。方法符合入选标准的冠心病患者100例分为丹参、葛根胶囊治疗组(试验组)和安慰剂组(对照组),每组50例,进行为期6个月的随机、双盲临床研... 详细信息

目的评估丹参加葛根作为辅助治疗药物对冠状动脉粥样硬化性心脏病(冠心病)二级预防的疗效及安全性。方法符合入选标准的冠心病患者100例分为丹参、葛根胶囊治疗组(试验组)和安慰剂组(对照组),每组50例,进行为期6个月的随机、双盲临床研究。6个月后受试者再自愿选择参与6个月的开放试验,期间受试者口服丹参、葛根胶囊的剂量为1.5g/d。采用超声波血管扫描测量并评估肱动脉血流介导性血管舒张功能(flow mediated dilation,FMD)和颈动脉内-中膜厚度(intima-media thickness,IMT)。结果给药前,两组间基础指标均衡,治疗6个月后,两组的血压、血液学、血生化、叶酸及同型半胱氨酸水平与治疗前相比,差异无统计学意义(P>0.05);低密度脂蛋白胆固醇与治疗前相比均有轻度下降,差异有统计学意义[(2.6±0.7)mmol/Lvs.(2.7±0.9)mmol/L,P<0.05;(2.5±0.7)mmol/Lvs.(2.8±0.8)mmol/L,P<0.05];试验组治疗后FMD改善明显,差异有统计学意义(5.9%±1.0%vs.5.3%±1.2%,P<0.001),对照组治疗后FMD有一定程度改善(5.5%±1.0%vs.5.3%±1.1%,P<0.05)。IMT的改善仅发生在试验组,差异有统计学意义[(0.96±0.32)mmvs.(0.98±0.30)mm,P<0.05]。6个月开放试验结果显示,试验组FMD和IMT有进一步改善,差异有统计学意义[5.91%±0.95%vs.5.35%±1.21%,P<0.05;(0.964±0.316)mmvs.(0.979±0.303)mm,P<0.05]。研究期间8例出现不同程度不良反应:试验组2例;对照组6例,其中2例需要终止临床试验。结论丹参加葛根辅助治疗冠心病具有良好的耐受性,能有效改善血管功能和结构,可用于冠心病的二级预防。

关键词：冠状动脉疾病丹参葛根颈动脉内皮血管