摘要
目的探讨表皮干细胞(epidermal stem cells,ESCs)诱导分化为汗腺细胞(sweat gland cells,SGCs)过程中表型的改变及其通路的调控机制。方法取健康成人包皮,采用中性蛋白酶消化后高浓度Ⅳ型胶原黏附法分离培养获得ESCs,行β_1整合素、角蛋白19(cytokeratin 19,CK19)及p63免疫荧光染色法鉴定;取健康成人全层皮肤,采用Ⅱ型胶原酶消化法分离提取汗腺组织,体外增殖培养SGCs,行CK7、CK18、CK19和癌胚抗原(carcinoembryonic antigen,CEA)免疫荧光法鉴定。取第2代ESCs分为4组:A组将ESCs及SGCs两种细胞通过Ttranswell共培养系统共培养,B组通过单纯添加汗腺上清液培养ESCs,C组在A组基础上加入浓度为60 ng/mL的EGF,D组在A组基础上加入浓度为10 mmol/L的PD98059。分别通过倒置相差显微镜进行细胞形态学观察、流式细胞术检测ESCs表型阳性率及Western blot检测分化过程中的信号通路机制。结果经细胞形态学观察及免疫荧光染色鉴定提示培养细胞为ESCs和SGCs。倒置相差显微镜观察示,A、C、D组培养后细胞形态变化相似,9 d后细胞开始出现扁平多角形结构改变;B组形态变化较慢培养12 d后与其他3组结构相似。流式细胞术结果示,与B组比较,A组Transwell共培养系统共培养后,ESCs的β_1整合素阳性率显著下调、CEA阳性率显著上调(P<0.05);C组加入EGF可降低共培养系统中ESCs的β_1整合素下调和CEA上调,D组加入PD98059可增强共培养系统中ESCs的β_1整合素下调和CEA上调,A、C、D组间比较差异均有统计学意义(P<0.05)。Western blot检测示,4组均有较高水平细胞外信号调节激酶(extracellular signal regulated kinase,ERK)表达,但B组明显低于其他3组(P<0.05);磷酸化-ERK表达A组最高、C组最低,各组间比较差异均有统计学意义(P<0.05)。结论处于SGCs生长环境中时,通过Transwell共培养系统共培养,ESCs可经诱导分化为SGCs,其表型发生相应改变;通过对丝裂原活化蛋白激�
Objective To explore the phenotypic changes of epidermal stem cells（ESCs） differentiating into sweat glands cells（SGCs） in vitro and its mechanisms. Methods ESCs and SGCs were isolated and cultured in vitro, which were identified using immunofluorescence staining. ESCs at passage 2 were divided into 4 groups： ESCs and SGCs co-cultured by Transwell plates in group A, ESCs cultured by simply adding sweat supernatant in group B, ESCs and SGCs co-cultured on Transwell plate adding epidermal growth factor（EGF）（60 ng/m L） in group C, and ESCs and SGCs co-cultured on transwell plate adding PD98059（10 mmol/L） in group D. The inverted microscope was used for observing the morphology of ESCs, flow cytometry for detecting ESCs positive phenotype, and Western blot for exploring mitogen-activated protein kinase/extracellular signal regulated kinase（MAPK/ERK） pathway. Results The morphology observation and immunofluorescence staining suggested that cultured cells were ESCs and SGCs. The inverted phase contrast microscope observation showed that cells had similar morphological changes, with flat polygonal shape at 9 days in groups A, C, and D; cells had slow morphological change in group B, and had similar change to that of other groups at 12 days. Significant decreasing of β1-integrin expression and increasing of carcino-embryonic antigen（CEA） expression of ESCs were observed in group A when compared with group B, which was inhibited by EGF（group C） and enhanced by PD98059（group D）, and there were significant differences among groups A, C, and D（P〈0.05）. High level of ERK expression was displayed in 4 groups, but it was significantly lower in group B than the other 3 groups（P〈0.05）. The expression of phosphorylation ERK was the highest in group A and was the lowest in group C, showing significant difference among 4 groups（P〈0.05）. Conclusion ESCs can be induced to differentiate into SGCs with the phenotypic changes under the condition of co-cultured by Transwell plates.
出处
《中国修复重建外科杂志》
CAS
CSCD
北大核心
2016年第2期245-250,共6页
Chinese Journal of Reparative and Reconstructive Surgery
关键词
皮肤
表皮干细胞
汗腺细胞
细胞分化
表型
信号通路
Skin
Epidermal stem cells
Sweat gland cells
Cell differentiation
Phenotype
Signal pathway
