溶血磷脂酸对人视网膜色素上皮细胞增殖的影响

目的 :探讨建立体外原代培养人类视网膜色素上皮细胞 (RPE)方法。方法 :取自愿者贡献的意外事故成年眼球 ,用 0 .2 5 %胰酶消化获取人RPE细胞、置 15 %胎牛血清的DMEM培养液中培养 ,细胞接近融合状态时进行传代培养。用溶血磷脂酸 (lysophosphatidicacid ,LPA)观察RPE增殖的影响。结果 :RPE原代细胞镜下为圆形 ,大小不一 ,内含较多的色素颗粒 ,胞核无法辨认。原代细胞培养贴壁后第 3天增殖速度明显加快 ,至 4～ 5d即可基本融合 ,细胞浆内色素颗粒则随传代次数增多而逐渐减少。第 3代培养的视网膜色素上皮细胞膜表面可见微绒毛 ,细胞质内细胞器丰富 ,线粒体量多 ,体积较小 ,内外膜分界清晰 ,嵴较短。色素颗粒散在分布于胞浆内 ,多数细胞质内含量较少 ,呈高电子密度包含物。LPA对原代培养的视网膜色素上皮细胞增殖有促进作用。结论 :LPA可促进人类RPE细胞体外培养的增殖 ,第 3代培养的视网膜色素上皮细胞可保留原代细胞的生物学特性

Effects of lysophosphatidic acid on proliferation in cultured human retinal pigment epithelium

Objective:To establish a primary culture of human retinal pigment epithelium cells in vitro.Methods:Adult human RPE cells were harvested as intact sheets from the eyes of volunteers,using the enzyme dispase. The primary cultured RPE cells were observed by scanning and transmission electron microscopy and passaged in vitro.Results:The freshly digested hRPE cells appeared as round,and contained large amounts of pigment,but the pigment in the RPE cells decreased as the cells divided. The third passage of cultured RPE cells still had large amounts of mitochondria and microvilli. LPA(lysophosphatidic acid) can stimulate the proliferation of RPE cells.Conclusion:LPA can stimulate the proliferation of hRPE in vitro. The third passage can still maintain the same biological activities as cells in the primary passage.