毛囊细胞高效分离培养方法的建立

Establishment of High Performance Method for Isolation and Cultivation of Hair Follicle Stem Cells of Neonatal Rats

【目的】建立一种简单易行、高效稳定、细胞活性好的毛囊细胞分离培养方法。【方法】无菌条件下剪下SD乳鼠触须部皮肤,拔出单个毛囊。采用Ⅰ型胶原酶、胰酶两步法消化毛囊,细胞悬液接种于细胞外基质包被的培养板中,以体积分数1%胎牛血清的K-SFM培养液培养,次日换无血清培养液。剩余组织块剪碎铺展于培养瓶中,添加含血清的HG-DMEM培养基常规培养。取以上2种细胞进行免疫荧光鉴定。毛囊上皮细胞进行流式细胞仪检测。【结果】两步酶法分离得到的毛囊上皮细胞贴壁迅速,圆形或多角形,呈典型铺路石状。培养的组织块周围有长梭形细胞爬出,细胞有突起,并连接成网状。毛囊上皮细胞CK15、CK19、β1整合素表达阳性,以G1期细胞为主,占75.6%。毛囊结缔组织鞘细胞的层粘连蛋白、纤维连接蛋白、波形蛋白表达阳性。【结论】分离培养的细胞为毛囊干细胞和成纤维细胞,该方法得到的细胞贴壁快、均一性好、增殖能力强。

Objective To establish a simple, practical, highly-effective and stable method for the isolation and cultivation of rat hair follicle cells. Methods Under sterile condition, single hair follicle was taken out after the skin around the barbel of SD neonatal rats was sheared off. And then the hair follicles were digested with two-step method with Type I collagenase and trypsin. The obtained cell suspension was planted into the culture plate which was covered with extracellular matrix, and then was cultivated with K-SFM culture medium containing fetal bovine serum with volume fraction of i%. On the next day, K-SFM culture medium was replaced with serum-free culture medium. The remaining tissues were cut into pieces and spread out in the culture flask, and then were cultivated with HG-DMEM culture medium containing serum. Two kinds of cells were harvested and then were identified by immunofluorescence. The hair follicle epithelial cells were tested by flow cytometer. Results The hair follicle epithelial cells obtained through the above methods showed rapid adherence, and were round or polygon-like, with typical cobblestone-like morphology. The long spindle-shaped cells were seen around the tissues cultivated, having many protrusions on the surface of the cells, and they were interconnected into reticular structure. The expression of cytokeratin 15, cytokeratin 19 and [31 integrin in epithelial ceils were positive. Most of the epithelial cells were in the G1 phase, accounting for 75.6%. The expression of laminin （LN）, fibronectin （FN） and vimentin in the connective tissue sheath ceils were also positive. Conclusion The cells harvested by modified two-step enzyme digestion method have confirmed as hair follicle cells and fibroblasts, and the obtained cells are of rapid adherence, good homogeneity, and active proliferation.