中国组织工程研究

• 干细胞培养与分化 stem cell culture and differentiation • 上一篇    下一篇

Accutase酶在精原干细胞原代分离中的应用

刘珊珊,徐丽萍,朱蔚云,马宁芳   

  1. 广州医科大学基础学院组织学与胚胎学教研室,广东省广州市  510182
  • 修回日期:2013-08-19 出版日期:2013-11-05 发布日期:2013-11-05
  • 通讯作者: 马宁芳,博士,教授,广州医科大学组织学与胚胎学教研室,广东省广州市 510182 maningfang@yahoo.com.cn
  • 作者简介:刘珊珊★,女,1987年生,河南省平顶山市人,汉族,广州医科大学在读硕士,主要从事细胞分化研究。gyliushanshan@163.com
  • 基金资助:

    国家自然科学基金资助项目(81170623)*

Application of Accutase enzymes in the separation of spermatogonial stem cells

Liu Shan-shan, Xu Li-ping, Zhu Wei-yun, Ma Ning-fang   

  1. Department of Histology and Embryology, Basic School of Guangzhou Medical University, Guangzhou  510182, Guangdong Province, China
  • Revised:2013-08-19 Online:2013-11-05 Published:2013-11-05
  • Contact: Ma Ning-fang, M.D., Professor, Department of Histology and Embryology, Basic School of Guangzhou Medical University, Guangzhou 510182, Guangdong Province, China maningfang@yahoo.com.cn
  • About author:Liu Shan-shan★, Studying for master’s degree, Department of Histology and Embryology, Basic School of Guangzhou Medical University, Guangzhou 510182, Guangdong Province, China gyliushanshan@163.com
  • Supported by:

    the National Natural Science Foundation of China, No. 81170623*

摘要:

背景:有研究报道胰酶消化在一定程度上会破坏精原干细胞表面抗原并影响细胞活性,对后续的细胞分选及下游实验有一定影响。Accutae酶具有蛋白酶和胶原酶的双重活性,在消化结束时无需终止和清洗,有保护细胞表面抗原的特殊作用,因而被应用于多种干细胞的培养及消化传代中。
目的:比较Accutase酶和胰酶在原代消化分离睾丸组织获取精原干细胞中的作用。
方法:新生5-7 d昆明雄鼠45只,取双侧睾丸胶原酶初步消化,混悬液定容后分为Accutase酶组、胰酶组、混合酶组(透明质酸酶+胰酶组),不同组别小鼠睾丸组织分别于酶消化1,3,5 min后显微镜下观察并拍照,比较各组不同时间点的消化状态及形成单细胞所需的时间;获取单细胞悬液后分别计算单位体积内所得细胞总数及死亡率;通过差速贴壁方法去除间质细胞及支持细胞,经包被有干细胞标志分子CD90.2的免疫磁珠进行分选,将所得CD90+及CD90-细胞用精原干细胞表面标志分子——胶质细胞源性神经营养因子受体α1标记,流式细胞仪检测不同组别CD90+及CD90-细胞群中胶质细胞源性神经营养因子受体α1精原干细胞的阳性率。
结果与结论:不同类别的消化酶对小鼠睾丸的消化作用有明显差异,其中 Accutase酶能更快获取单细胞悬液,其细胞团及破膜细胞明显少于胰酶组和混合酶组,其所得细胞总数高于其余2组,而细胞死亡率则低于其余2组。差速贴壁后细胞免疫磁珠分选结果显示Accutase酶组CD90+精原干细胞得率高,流式分选结果显示胶质细胞源性神经营养因子受体α1+/CD90+细胞为72.24%,高于胰酶组及混合酶组(51.16%,71.27%);而胶质细胞源性神经营养因子受体α1+/CD90-细胞比率(15.03%)则低于胰酶组及混合酶组(18.8%,24.23%)。结果表明Accutase酶在分离和获取精原干细胞实验中效果优于胰酶。

关键词: 干细胞, 干细胞培养与分化, 新生鼠睾丸, 精原干细胞, Accutase酶, 胰酶, 透明质酸酶, 磁珠分选, 流式细胞分选, CD90.2, 胶质细胞源性神经营养因子受体α1, 国家自然科学基金, 干细胞图片文章

Abstract:

BACKGROUND: It is reported that the cell surface antigen may be damaged by the trypsin enzyme in some extent and the cell activity may also be influenced, as a result of which, the subsequent separation and follow-up-test will be affected. Accutase enzymes possess the activities of protease and collagen enzyme and need no special termination or cleaning at the end of digestion. Another special function of accutase enzyme is to protect cell surface antigen and thus it has been widely applied in the stem cell digestion and culture.
OBJECTIVE: To compare the digestive effect of accutase enzymes and trypsin enzyme in the separation and original culture of spermatogonial stem cells. 
METHODS: The testes of 5-7 days male Kunming mice (n=45) were collected and primarily digested with collagenas. The suspension of digested tissue was divided into three parts with the same volume named accutases enzyme group, trypsin enzyme group and mixed enzyme group (trypsin enzyme and hyaluronidase). For the comparison of testis digestive status and the time required for the formation of single cells, the micrographs were taken at 1, 3 and 5 minutes respectively after enzyme digestion. The total number and the mortality of the single cells were estimated and compared. The leydig cells and sertoli cells were removed by differential adherent method and the remained spermatogenic cells were then treated with CD90.2 immune magnetic beads. The selected spermatogonial stem cells were subsequently labeled by glial cell line-derived neurotrophic factor receptor alpha-1 and sorted with flow cytometry. The number of spermatogonial stem cells positive for glial cell line-derived neurotrophic factor receptor alpha-1 in CD90.2+ and CD90.2- cells was compared within different groups.
RESULTS AND CONCLUSION: The digestive capacities of different enzyme were different. Accutases enzyme obtained the single cell suspension more quickly than trypsin enzyme and mixed enzyme, and had the least cell masses and broken cell membrane than the other two groups. After the differential attached treatment, the highest total number of CD90+ spermatogonial stem cells and lowest cell mortality could be found in the accutases group, when compared with the other groups. The results of cell sorting by flow cytometry showed a higher rate (72.24%) of GFRα1+/ CD90+ cells in the accutases group than the trypsin group (51.16%) and mixed enzyme group (71.27%). The GFRα1+/CD90- number in the accutases group was lower (15.03%) than that of the trypsin group (18.8%) and mixed enzyme group (24.23%), respectively. The results indicate a better effect of accutases enzyme on the primary separation of spermatogonial stem cells than that of trypsin or mixed enzyme.

Key words: stem cells, spermatogonia, trypsin, hyaluronoglucosaminidase, flow cytometry

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