Effect of collagenⅠon the DDR2,HIF-1α and VEGF expression of human retinal pigment epithelial cells under hypoxia
- Author:
- No author available
- Journal Title:
- INTERNATIONAL EYE SCIENCE
- Issue:
- 10
- DOI:
- 10.3969/j.issn.1672-5123.2012.10.04
- Key Word:
- 胶原;盘状结构域受体2;缺氧;视网膜色素上皮细胞;缺氧诱导因子-1α;血管内皮生长因子;脉络膜新生血管
Abstract： 目的:观察缺氧状态下人视网膜色素上皮(retinal pigment epithelium,RPE)细胞中盘状结构域受体2(discoidin domain receptor 2,DDR2)的表达,观察Ⅰ型胶原缺氧刺激下RPE细胞中DDR2,缺氧诱导因子-1α(hypoxia inducible factor-1α,HIF-1α)和血管内皮生长因子(vascular endothelial growth factor,VEGF)的表达,探讨Ⅰ型胶原和DDR2在脉络膜新生血管(choroidal neovascularization,CNV)发生中的作用.方法:对照实验研究.将体外培养的人RPE细胞置于含终浓度为200μmol/L CoCl2的培养液中培养以建立RPE细胞化学缺氧模型.在缺氧后即刻(即常氧状态下)、2,6,12和24h终止缺氧,用免疫荧光、逆转录聚合酶链反应(reverse transcription polymerase chain reaction,RT-PCR)和免疫蛋白印迹法(Western blotting)检测RPE细胞中DDR2的表达.缺氧条件下以Ⅰ型胶原(10μg/mL,50℃孵箱内孵育)刺激,在刺激后即刻(即常氧状态下)、2,6,12,24h终止缺氧,用RT-PCR和Western blotting检测RPE细胞中DDR2和HIF-1α的表达,酶联免疫吸附试验(enzyme linked immunosorbent assay,ELISA)法观察RPE细胞培养上清中VEGF的表达.结果:随着缺氧时间延长,RPE细胞中DDR2 mRNA和蛋白表达降低.在缺氧状态下Ⅰ型胶原仍可以随时间迁移使得DDR2 mRNA和蛋白表达增加,激活DDR2.缺氧胶原刺激组相对于缺氧组HIF-1α mRNA和蛋白表达减少,VEGF蛋白表达减少.结论:缺氧条件下,RPE细胞中DDR2表达随时间推移逐渐降低.Ⅰ型胶原仍可以随时间迁移激活DDR2,缺氧胶原刺激可以抑制缺氧诱导的RPE细胞HIF-1α和VEGF表达上调.
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