不同明胶浓度及淋巴细胞分离液对人脐血源黏附细胞原代培养的影响

Influence of Different Gelatin Concentration and Lymphocyte Isolation Liquid on Primary Culture of Umbilical Cord Blood Derived Adhensive Cells

本研究观察不同明胶浓度及淋巴细胞分离液对人脐血源黏附细胞原代培养的影响。采用3%及6%明胶浓度沉降脐血红细胞并观察分离效果;应用Ficoll及Percoll淋巴细胞分离液分离脐血单个核细胞,观察其对人脐血源黏附细胞48小时贴壁率、细胞开始伸展时间、细胞培养成功率的影响,倒置显微镜观察细胞形态及生长状况,用细胞化学、免疫细胞化学进行细胞鉴定。结果显示,6%明胶浓度对红细胞沉降效果明显好于3%的明胶。无论是48小时贴壁率、细胞开始伸展时间、黏附细胞集落开始形成时间、集落数达最高的时间及细胞融合时间,还是细胞培养成功率,Percoll明显优于Ficoll;两种方法分离培养的人脐血源黏附细胞的形态、细胞化学染色及免疫细胞化学染色等生物学特征无差异。结论:6%明胶联合Percoll细胞分离液是理想的人脐血源黏附细胞原代培养分离方法,本研究为人脐血源黏附细胞在临床的早日应用提供了基础信息。

In order to study-the-influence of different gelatin concentrations, and lymphocyte isolation liquid on primary culture of umbilical cord blood-derived adhensive cells （ hCBACs）, the red blood cells of umbilical cord blood was separated by 3% and 6 % gelatin for detecting the effectiveness of sedimentation, then the adhesion rate at 48 hours, the day of initial expansion and the rate of culture success were detected for hCBACs cultured with CD34^＋ cells after the mononuclear cells were separated by 6% gelatin followed by Ficoll and Percoll, and the morphological characteristics and growth status were observed by invert microscopy. Cytochemistry stain for nonspecific esterase stain （ NSE）, peroxidate （ POX）, periodic acid Schiff reaction （ PAS ） and alkali phosphatase （ ALP ） and immunocytochemistry labeling for CD31, CD45, CD68 and fibronectin （Fn） were detected. The results showed that 6 % gelatin was better than that 3 % gelatin for red blood sedimentation. The Percoll was predominant over Ficoll in adhesion rate at 48 hours, the day of initial expansion, the time of initial formation of adhensive cell colony units, the time of maximal numbers of adhensive cell colony units, the the cell fusion time and ratio of culture success. 60% fibroblast-liked cells, 36% macrophage liked cells and 4% small-round cells were observed in cells isolated by both isolated methods. The cytochemistry stain for NSE, POX, PAS and ALP was similar in two groups, the difference was not statistically significant between these two groups. The immunocytochemistry labeling for CD31, CD45, CD68 and Fn was also similar in both groups and the difference was also not statistically significant between these two groups. It is concluded that the combination of 6% gelatin with Percoll is an ideal separation method for primary culture of hCBACs, which provides basic information for clinical application.