犬脐静脉血管内皮细胞的分离培养与鉴定

ISOLATION,CULTURE,AND IDENTIFICATION OF CANINE UMBILICAL VEIN VASCULAR ENDOTHELIAL CELLS

目的建立一种简便、高效的犬脐静脉血管内皮细胞分离方法,并进行培养和鉴定。方法无菌条件下取12只新生比格犬脐带共12根,脐带长(13.0±1.5)cm。PBS液冲洗后,各取4根脐带注入1%Ⅰ型胶原酶分别消化脐静脉5、7、10 min后,收集细胞并行锥虫蓝计数;倒置相差显微镜下观察细胞形态,待细胞爬满培养瓶后以1∶2比例传代。取Ⅰ型胶原酶消化7 min获得的第3代细胞,通过免疫荧光染色和流式细胞仪检测细胞中血管假性血友病因子(vonWillebrand factor,vWF)和血小板-内皮细胞黏附分子CD31表达,进行细胞鉴定;MTT检测细胞增殖。结果消化5、10 min后未收集到或偶尔收集到血管内皮细胞;消化7 min可见大量血管内皮细胞,培养24 h后细胞呈多角形,随培养时间延长细胞逐渐呈"铺路石"样生长,细胞核较大,多为单核,少数细胞为双核,传代后细胞形态无明显变化。荧光倒置显微镜下观察,培养细胞vWF和CD31表达阳性;流式细胞仪检测示培养细胞vWF阳性表达率为99.0%±0.7%,CD31阳性表达率为98.0%±1.2%,提示培养细胞为血管内皮细胞。MTT检测示,随培养时间延长,血管内皮细胞增殖速度明显提高。结论采用酶消化法从犬脐静脉中分离培养血管内皮细胞操作简便,且细胞数量多、纯度高。

Objective To establish a simple and efficient method to isolate and culture the umbilical vein vascular endothelial cells in canine. Methods Twelve umbilical cords [（13.0 ＋ 1.5） cm in length] were taken from 12 newborn pups of Beagles. And then the vascular endothelial cells were isolated from these umbilical cords digested by 1% collagenase type I for 5, 7, and 10 minutes respectively （4 umbilical cords in each group）. After cultured, the vascular endothelial cells were identified by morphology, immunofluorescence, and flow cytometry. And the growth curvature of umbilical vein vascular endothelial cells was detected by MTT assay. Results Few vascular endothelial cells were collected at 5 and 10 minutes after digestion; many vascular endothelial cells were seen at 7 minutes, and became cobblestone with culture time, with a large nucleus; after passage, cell morphology had no obvious change. Fluorescence microscope results showed that positive yon Willebrand factor （vWF） and CD31 cells were observed in most of cells. The flow cytometry test displayed that the positive cell rates ofvWF and CD31 were 99.0% ± 0.7% and 98.0% ± 1.2%, respectively. The above results indicated that cultured cells were vascular endothelial cells. MTT assay showed that vascular endothelial cells proliferation increased significantly with culture time. Conclusion Enzyme digestion is a convenient method to isolate vascular endothelial cells from canine umbilical vein, and a large number of cells and high purity of cells can be obtained by the method.