中国组织工程研究 ›› 2017, Vol. 21 ›› Issue (1): 1-5.doi: 10.3969/j.issn.2095-4344.2017.01.001

• 骨髓干细胞 bone marrow stem cells •    下一篇

miR-21慢病毒载体构建及对骨髓间充质干细胞凋亡的影响

付霞霏,何援利,王雪峰,陈小莹   

  1. 南方医科大学珠江医院妇产科,广东省广州市  510282
  • 修回日期:2016-11-04 出版日期:2017-01-08 发布日期:2017-03-15
  • 作者简介:付霞霏,女,1979年生,汉族,2008年南方医科大学毕业,博士,副主任医师,硕士生导师,主要从事女性生殖内分泌及妇科肿瘤研究。
  • 基金资助:

    国家自然科学基金(81300462);广东省科技计划项目(2012B031800123);广东省科技计划项目(2013B021800145)

Establishment of a lentiviral vector carrying rat miR-21 gene and its effect on apoptosis of bone marrow mesenchymal stem cells

Fu Xia-fei, He Yuan-li, Wang Xue-feng, Chen Xiao-ying   

  1. Department of Obstetrics & Gynecology, Zhujiang Hospital of Southern Medical University, Guangzhou 510282, Guangdong Province, China
  • Revised:2016-11-04 Online:2017-01-08 Published:2017-03-15
  • About author:Fu Xia-fei, M.D., Associate chief physician, Master’s supervisor, Department of Obstetrics & Gynecology, Zhujiang Hospital of Southern Medical University, Guangzhou 510282, Guangdong Province, China
  • Supported by:

    the National Natural Science Foundation of China, No. 81300462; the Scientific Research Plan Projects of Guangdong Province, No. 2012B031800123, 2013B021800145

摘要:

文章快速阅读:

文题释义:
慢病毒载体:
是指人类免疫缺陷病毒1(HIV-1)来源的一种病毒载体,是慢病毒载体系统的主要组成部分。携带有外源基因的慢病毒载体在慢病毒包装质粒、细胞系的辅助下,经过病毒包装成为有感染力的病毒颗粒,通过感染细胞或活体组织,实现外源基因在细胞或活体组织中表达。
MOI:即感染复数,一般认为MOI是一个比值,没有单位,用于病毒感染细胞的研究中,含义是感染时病毒与细胞数量的比值。每种细胞对慢病毒的敏感性不一样,因此通常以不同浓度的病毒液感染靶细胞并观察转染效果,以确定细胞对该病毒载体的最适感染复数。

 

摘要
背景:
骨髓间充质干细胞移植后凋亡成为治疗化疗性卵巢早衰效果欠佳的主要原因。miR-21参与细胞增殖与凋亡的调控,有重要的抗凋亡作用。
目的:构建miR-21慢病毒载体并感染骨髓间充质干细胞,观察其对化疗药物磷酰胺氮芥诱导的骨髓间充质干细胞凋亡的影响。
方法:构建携带miR-21基因慢病毒表达载体LVX-shRNA2-rno-miR-21-5p,双酶切及基因测序鉴定证实载体构建成功。对载体进行包装、测定病毒滴度。将慢病毒颗粒以不同感染复数(20和40)感染骨髓间充质干细胞,检测感染效率,使用real-time PCR法检测骨髓间充质干细胞中miR-21的表达。流式细胞仪、Hoechst33342染色检测骨髓间充质干细胞在磷酰胺氮芥模拟的化疗微环境中的凋亡率。
结果与结论:①成功构建miR-21慢病毒载体,病毒滴度约为6×1011 CFU/L;②载体转染骨髓间充质干细胞效率达90%以上;③miR-21组1(感染复数为20)、miR-21组2(感染复数为40)miR-21表达量明显高于骨髓间充质干细胞组及空载组(P=0.000);④转染组骨髓间充质干细胞的凋亡率、凋亡指数均低于空载组及骨髓间充质干细胞组(P=0.001);⑤实验成功构建大鼠miR-21慢病毒载体系统,miR-21上调能抑制骨髓间充质干细胞凋亡,促进细胞增殖。

 

中国组织工程研究杂志出版内容重点:干细胞;骨髓干细胞;造血干细胞;脂肪干细胞;肿瘤干细胞;胚胎干细胞;脐带脐血干细胞;干细胞诱导;干细胞分化;组织工程
ORCID:
0000-0002-0344-7620(付霞霏)

关键词: 干细胞, 骨髓干细胞, 载体构建, miR-21, 慢病毒, 骨髓间充质干细胞, 基因转染, MicroRNAs, 细胞凋亡, 化疗性卵巢早衰, 国家自然科学基金

Abstract:

BACKGROUND: Apoptosis in bone marrow mesenchymal stem cells (BMSCs) occurs after transplantation, which is mainly responsible for unsatisfactory therapeutic effects on premature ovarian failure 
induced by chemotherapy. miR-21 participates in the regulation of cell proliferation and apoptosis, and has important anti-apoptotic effect.
OBJECTIVE: To construct a lentiviral vector for rat miR-21 and observe its effects on apoptosis of BMSCs induced by phosphoramide nitrogen mustard.
METHODS: Rat miR-21 gene was synthesized, amplified, and connected with the lentiviral plasmid pLVX-shRNA2. Both double enzyme digestion and gene sequencing were done to identify the successful construction of the vector pLVX-shRNA2-rno-miR-21-5p. The vector was packaged, and the titer was examined. BMSCs were transfected by the vector with different multiplicities of infection (MOI=20 or 40), and the efficiency was observed. miR-21 expression in the transfected cells was detected using real-time PCR. Phosphoramide nitrogen mustard was added into the cell culture media of BMSCs, then the apoptotic rate of BMSCs was detected by flow cytometry, and apoptotic index was examined by Hoechst33342 staining.
RESULTS AND CONCLUSION: The target gene was successfully connected with the lentiviral vector. The viral titer was 6×1011 CFU/L. The vector transfected BMSCs had a high efficiency above 90%. Real-time PCR results showed the expression levels of miR-21 in miR-21 group 1 (MOI=20) and miR-21 group2 (MOI=40) were higher than that in BMSCs group and blank vector group (P=0.000). Flow cytometry and Hoechst33342 staining results showed the apoptotic rate and apoptotic index of miR-21 transfected groups were lower than those of blank vector group and BMSCs group (P=0.001). Overall, we successfully established rat miR-21 lentivirus vector pLVX-shRNA2-rno-miR-21-5p and transfected it into the BMSCs. Upregulation of miR-21 could reduce BMSCs apoptosis, and enhance cell proliferation.

 

Key words: Ovarian Diseases, MicroRNAs, Transfection, Apoptosis, Tissue Engineering

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