肺微血管内皮细胞原代培养方法的建立

A method for primary culture of pulmonary microvascular endothelial cells

目的 建立大鼠肺微血管内皮细胞原代培养方法, 观察细胞生长状态并鉴定细胞性质。方法 4-5周龄大鼠随机分成3组, 无菌状态下剥除胸膜, 将肺组织边缘剪成1 mm3的大小, 贴入一次性培养瓶, 分别用含肝素钠的DMEM完全培养液、RPMI1640完全培养液以及含原代内皮细胞培养特制添加剂的完全培养液培养, 在倒置显微镜下观察细胞生长和形态, 免疫荧光组织化学染色观察细胞CD31的表达。结果 与2组对照组相比, 采用含原代内皮细胞培养特制添加剂的完全培养液培养, 获得的肺微血管内皮细胞数量多, 纯度高。内皮细胞于24 h迁移出肺组织块, 14 d左右汇合, 呈多角形, 以铺路石样镶嵌状排列生长。传代细胞呈长梭形, 生长迅速, 具有自发形成血管的倾向。细胞为CD31免疫反应阳性, 证实其为内皮细胞。结论 采用组织块贴壁法, 选择原代内皮细胞培养特制添加剂以及优化分离过程, 可以获得高纯度原代大鼠肺微血管内皮细胞。

Objective To explore a simple and practical method of primarily culturing rat pulmonary microvascular endothelial cells （PMECs） in vitro, and observe the cell growth status and identify the PMECs. Methods Wistar rats （n = 40, aged 4 -5 weeks） were sacrificed to take the lung tissue. After removal of pleura, the peripheral lung tissues were cut into pieces （l mm3 ） in aseptic condition. The endothelial cells were cultured in the DMEM medium containing heparin sodium and in the RPMI1640 medium supplemented with special additives or not, respectively. Cell growth and morphology was observed under an inverted microscope. The expression of CD31 in cells was detected by immunofluorescence staining. Results After incubation for 24 hours, PMECs in the medium containing special additives were the most in number and purity compared with the other two culture systems. At 24 hours, endothelial cells migrated from the lung tissue, and at 14 days, the cells aggregated and grew obviously, exhibiting a polygon shape, being tightly arranged and paving the base of Petri dish. After sub-culturing, the cells spread much more and most cells became spindle shaped, which showed a tendency of endothelial cell angiogenesis in vitro. CD3I was positive in immunofluorescence staining. Conclusion The adherent culture method of tissue explants in the medium added by the special additives was proved to a good method to obtain a high-purity rat PMECs in vitro.