一种高选择性、高效的牛视网膜微血管内皮细胞培养方法

A novel method for culture of bovine retinal capillary endothelial cells

目的建立一种高效、可行、特异性高的牛视网膜微血管内皮细胞(BREC)培养方法。方法取新鲜牛眼,分离视网膜并用DMEM进行冲洗、匀浆剪碎,过75μm筛,将滤网上滤渣转移至50ml离心管,用Ⅰ型胶原酶、DNaseⅠ及蛋白酶等多种酶混合液消化20min,人血清中和后,过46μm网筛并冲洗,离心5min,将组织扣在培养皿中,转入15ml离心管,用10%人血清含生长因子ECGS的DMEM培养液培养于25cm2,选择性培养视网膜血管内皮细胞,接种于明胶包被培养瓶中,采用ECGS配合肝素培养液促进内皮细胞生长,观察细胞形状生长特性,并用免疫化学荧光方法进行鉴定。结果选择性培养视网膜微血管内皮细胞成单层、镶嵌铺路石状生长,Ⅷ因子相关抗原免疫荧光检测为阳性纯度均大于95%以上,将细胞种在凝固的基质胶表面,12～18h形成官腔结构。结论本方法过程简单、可靠,培养的内皮细胞纯度高,生长状态良好,稳定传代,为视网膜血管生成疾病研究建立了模型。

Objective To provide an efficient, practicable and high specificity method for culture of bovine retinal capillary endothelial cells（BRCEC）. Methods Fresh bovine eyes were obtained from a local market. The retinas were removed and washed several times in DMEM. Subsequently retinas were homogenized and the resultant pellet was resuspended in an isolation medium. Microvesseles were trapped on an 75 μm nylon mesh and transferred to a 50 ml centrifuge tube containing 10 ml enzyme cocktail which includes collagenase Ⅰ, DNase Ⅰand pronase and treated for 20 min. The resultant vessel fragments were trapped on a 46 μm nylon mesh,washed with the isolation medium and centrifuged for 5 min. For selective culture of BRCECs, the resultant pellet was resuspended in 2 ml of the BRCEC growth medium and transferred into 25 cm2 gelatin-coated plastic tissue culture flasks. BRCECs were identified by immunohistochemical method of factor Ⅷ. Results The purity of selectively cultured BRCECs was more than 95%. Cells seeded onto the surface of the polymerized EC Matrix could develop the cellular network structures by 12-18 h. Conclusion BRCECs can be attained easily and effectively by this method. This culture method would provide a useful model for studying disease related to retinal vessels in vitro.