中国组织工程研究 ›› 2016, Vol. 20 ›› Issue (10): 1481-1487.doi: 10.3969/j.issn.2095-4344.2016.10.016

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

过氧化氢刺激人牙髓干细胞的衰老进程

徐 克1,冯桂娟2,冯兴梅2,黄 丹2,郑 科2,唐恩溢1   

  1. 1南京大学医学院,江苏省南京市  210093;2南通大学附属医院口腔科,江苏省南通市  226001
  • 收稿日期:2016-01-24 出版日期:2016-03-04 发布日期:2016-03-04
  • 通讯作者: 冯桂娟,医师,硕士,南通大学附属医院口腔科,江苏省南通市 226001
  • 作者简介:徐克,男,1982年生,江苏省南通市人,汉族,2006年南通大学毕业,主治医师,主要从事口腔颌面外科及牙髓干细胞生物学特性方面的研究。
  • 基金资助:
    国家自然科学基金青年基金项目(81500809)

Hydrogen peroxide accelerates senescence of human dental pulp stem cells

Xu Ke1, Feng Gui-juan2, Feng Xing-mei2, Huang Dan2, Zheng Ke2, Tang En-yi1   

  1.  1Medical School of Nanjing University, Nanjing 210093, Jiangsu Province, China; 2Department of Stomatology, Affiliated Hospital of Nantong University, Nantong 226001, Jiangsu Province, China
  • Received:2016-01-24 Online:2016-03-04 Published:2016-03-04
  • Contact: Feng Gui-juan, Master, Physician, Department of Stomatology, Affiliated Hospital of Nantong University, Nantong 226001, Jiangsu Province, China
  • About author:Xu Ke, Attending physician, Medical School of Nanjing University, Nanjing 210093, Jiangsu Province, China
  • Supported by:

    the National Natural Science Foundation of China, No. 81500809

摘要:

文章快速阅读:

文题释义:

牙髓干细胞:2000年,Gronthos等人利用酶消化的方法,从人第三磨牙中分离出比骨髓基质干细胞具有更高克隆能力和增殖能力的牙髓干细胞。牙髓干细胞的鉴别主要依赖于它的生物学特性,包括细胞体积小、集落生成能力、高增殖能力、自我更新能力和多潜能分化能力。

细胞衰老:指由DNA损伤、氧化应激、基因表达紊乱和其他有害刺激导致的不可逆的细胞生长停滞,它包含了细胞增殖及功能的改变,细胞的衰老促进了机体的老化和相关疾病的发生。研究发现调节细胞衰老的机制有多种假说,例如端粒酶学说、DNA损伤学说、氧化应激学说等。

 

背景:细胞移植治疗受区存在氧化应激过程,影响疗效。研究氧化应激对牙髓干细胞的影响及机制方面的报道较少。
目的:分离培养人牙髓干细胞,分析加入过氧化氢(H2O2)对其衰老程度的影响。
方法:牙髓干细胞分为3组,分别用PBS、100 μmol/L H2O2、200 μmol/L H2O2刺激2 h。倒置显微镜下观察细胞形态,β-半乳糖苷酶染色观察细胞衰老程度,BrdU试剂盒和细胞计数法检测细胞增殖能力,免疫荧光检测细胞骨架排列情况和sirt1蛋白的表达,Western Blot法测定sirt1、p16蛋白的表达。

结果与结论:①牙髓干细胞呈成纤维细胞样梭形外观。②H2O2刺激后,细胞体积增大、β-半乳糖苷酶染色加深、细胞增殖能力降低,随着H2O2浓度增加,牙髓干细胞衰老增强,在此过程中,p16表达上调,sirt1表达受到抑制。③结果表明H2O2刺激促进牙髓干细胞衰老,sirt1、p16参与了此过程,为牙髓干细胞移植提供了理论基础和实验支持。 

 ORCID: 0000-0002-2872-1905 (冯桂娟)

关键词: 干细胞, 培养, 牙髓干细胞, 过氧化氢, 衰老, p16, sirt1, 国家自然科学基金

Abstract:

BACKGROUND: The process of oxidative stress that impacts the curative effect exists in the region which accepts cell transplantation. However, there are few reports about the effects of oxidative stress on human dental pulp stem cells and relevant mechanism.
OBJECTIVE: To understand the effect of hydrogen peroxide on the senescence of human dental pulp stem cells.
METHODS: Human dental pulp stem cells were isolated and cultured in PBS, 100 and 200 μmol/L hydrogen peroxide for 2 hours, respectively. Cell morphology was observed under inverted microscope, degree of cell senescence monitored by β-galactosidase staining, cell proliferation ability detected by BrdU kit and cell counting method, cytoskeleton of dental pulp stem cells and expression of sirt1 tested using immunofluorescence method, and expression of sirt1 and p16 proteins measured by western blot assay.
RESULTS AND CONCLUSION: Dental pulp stem cells exhibited a fibroblast-like morphology with spindle-shaped appearance. After stimulated by hydrogen peroxide, the cell volume was enlarged, the β-galactosidase staining deepened and the proliferation of dental pulp stem cells reduced. The enhancement of senescence of dental pulp stem cells was accompanied with the increasing concentration of hydrogen peroxide, and in this process, the expression of p16 was raised while the expression of sirt1 was decreased. In conclusion, the senescence of human dental pulp stem cells can be promoted by the stimulation of hydrogen peroxide, and sirt1 and p16 are involved in this process. Our findings may provide a theoretical and experimental foundation for autologous transplantation of dental pulp stem cells.