中国组织工程研究 ›› 2019, Vol. 23 ›› Issue (25): 3973-3977.doi: 10.3969/j.issn.2095-4344.1789

• 骨髓干细胞 bone marrow stem cells • 上一篇    下一篇

慢病毒载体介导CC趋化因子受体7基因过表达可促进大鼠骨髓间充质干细胞归巢

王志红,陈为民,林  芸,尚  晋,魏天南
  

  1. 福建省立医院血液科,福建医科大学省立临床医学院,福建省福州市  350001
  • 修回日期:2019-04-17 出版日期:2019-09-08 发布日期:2019-09-08
  • 通讯作者: 陈为民,主任医师,福建省立医院血液科,福建医科大学省立临床医学院,福建省福州市 350001
  • 作者简介:王志红,女,1980 年生,河北省邯郸市人,汉族,2011年南方医科大学毕业,博士,副主任医师,主要从事多能干细胞的应用研究。
  • 基金资助:

    福建省卫生计生中青年骨干人才培养项目(2016-ZQN-4),项目负责人:王志红;福建省科技创新联合基金项目(2017Y9068),项目负责人:王志红

Lentiviral vector-mediated over-expression of CC chemokine receptor 7 promotes homing of rat bone marrow mesenchymal stem cells

Wang Zhihong, Chen Weimin, Lin Yun, Shang Jin, Wei Tiannan
  

  1. Department of Hematology, Fujian Provincial Hospital, Clinical School of Fujian Medical University, Fuzhou 350001, Fujian Province, China
  • Revised:2019-04-17 Online:2019-09-08 Published:2019-09-08
  • Contact: Chen Weimin, Chief physician, Department of Hematology, Fujian Provincial Hospital, Clinical School of Fujian Medical University, Fuzhou 350001, Fujian Province, China
  • About author:Wang Zhihong, MD, Associate chief physician, Department of Hematology, Fujian Provincial Hospital, Clinical School of Fujian Medical University, Fuzhou 350001, Fujian Province, China
  • Supported by:

    the Young & Middle-Aged Backbone Talent Training Project of Fujian Provincial Health and Family Planning Commission, No. 2016-ZQN-4 (to WZH); Science and Technology Innovation Foundation of Fujian Province, No. 2017Y9068 (to WZH)

摘要:

文章快速阅读:

文题释义:
归巢:
1983年Gallatin等在《自然》杂志上首次报道血源性淋巴细胞能选择性进入二级淋巴器官,这个过程用“归巢”进行了定义。近年来,随着干细胞疗法的兴起,归巢被引申至对多种干细胞的描述。所谓间充质干细胞归巢,是指自体或外源性间充质干细胞在多种因素的作用下定向趋向性迁移至靶器官并定植的过程。
SLC/CCR7信号通路:次级淋巴组织趋化因子(SLC)与细胞的迁移归巢有关,其受体CC趋化因子受体7(CCR7)是一类具有促进归巢功能的趋化因子受体,间充质干细胞特异性表达CCR7,而SLC/CCR7信号通路对间充质干细胞的归巢具有重要作用。

 

摘要
背景:
研究发现,骨髓间充质干细胞特异性地表达CC趋化因子受体7(CC chemokine receptor,CCR7),与其配体次级淋巴组织趋化因子(secondary lymphoid-tissue chemokine,SLC)相互作用,有助于骨髓间充质干细胞归巢到损伤部位。
目的:探讨CCR7基因过表达对大鼠骨髓间充质干细胞体内外归巢特性的影响。
方法:利用慢病毒载体介导大鼠骨髓间充质干细胞过表达CCR7基因,建立过表达CCR7的骨髓间充质干细胞。通过Transwell实验体外检测趋化因子SLC对过表达CCR7的骨髓间充质干细胞体外定向迁移的影响。将SD大鼠分为4组,每组动物10 只:①对照组:未接受全身照射大鼠作为对照组;②照射组:大鼠接受全身照射(60Co单次全身照射,总剂量为7.5 Gy,照射量率为0.75 Gy/min),输注生理盐水1 mL;③BMSCs-GFP组:大鼠经全身照射后,输注GFP标记的骨髓间充质干细胞悬液1 mL (含细胞5×105个);④CCR7-BMSCs-GFP组:大鼠经全身照射后,输注携带GFP和CCR7基因的骨髓间充质干细胞1 mL (含细胞5×105个)。移植24 h后取大鼠脾脏做冰冻切片,荧光显微镜下观察骨髓间充质干细胞归巢情况,流式细胞技术检测骨髓间充质干细胞在脾脏的归巢率。ELISA方法检测照射后大鼠外周血中SLC水平。
结果与结论:①Transwell实验结果表明,过表达CCR7可促进骨髓间充质干细胞向趋化因子SLC迁移募集;②冰冻切片结果显示,过表达CCR7可明显提高骨髓间充质干细胞归巢至损伤脾脏的效率;③流式细胞术测定过表达CCR7的骨髓间充质干细胞归巢至脾脏数量明显高于BMSCs-GFP组(P < 0.05);④ELISA结果显示,照射24 h后大鼠外周血中SLC水平明显升高;⑤结果表明,CCR7及其配体SLC对骨髓间充质干细胞的归巢有促进作用。


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: 0000-0002-2225-3100(王志红)

关键词: SLC/CCR7, 骨髓, 间充质干细胞, 过表达CCR7基因, 干细胞移植, 细胞归巢, 脾脏

Abstract:

BACKGROUND: Bone marrow mesenchymal stem cells specifically express CC chemokine receptor 7 (CCR7). The interaction between secondary lymphoid-tissue chemokine and CCR7 contributes to the homing of bone marrow mesenchymal stem cells to the injured site.
OBJECTIVE: To explore the effects of CCR7 gene over-expression on the homing capacity of bone marrow mesenchymal stem cells in vivo.
METHODS: Rat bone marrow mesenchymal stem cells overexpressing CCR7 were constructed by lentiviral vector. We conducted a Transwell experiment to detect the effect of secondary lymphoid-tissue chemokine on the directional migration of bone marrow mesenchymal stem cells in vitro. Sprague-Dawley rats were divided into four groups (n=10/group): (1) Control group: non-irradiated rats were used as control group; (2) radiation group in which the rats were exposed to total body irradiation (60Co, 0.75 Gy/min, 7.5 Gy in total), and then were infused with 1 mL of normal saline; (3) BMSCs-GFP group in which the rats were infused with bone marrow mesenchymal stem cell suspension (1 mL, 5×105 cells) transfected by GFP via the tail vein after total body irradiation; (4) CCR7-BMSCs-GFP group in which the rats were infused with bone marrow mesenchymal stem cells (1 mL, 5×105 cells) simultaneously carrying GFP and CCR7 gene via the tail vein after total body irradiation. The rats were sacrificed at 24 hours after infusion, and the frozen sections of the spleen were prepared to detect the distribution of infused cells. Furthermore, the homing rate of bone marrow mesenchymal stem cells to the rat spleen was detected by flow cytometry. The level of secondary lymphoid-tissue chemokine was detected by ELISA.
RESULTS AND CONCLUSION: (1) Results of the Transwell experiment showed that CCR7 over-expression gene promoted the directional migration of bone marrow mesenchymal stem cells to secondary lymphoid-tissue chemokine. (2) The CCR7 over-expression could significantly enhance the homing rate of bone marrow mesenchymal stem cells into the spleen. (3) Flow cytometry results slowed that the number of bone marrow mesenchymal stem cells overexpressing CCR7 homing into the spleen was significantly higher than that in the BMSCs-GFP group (P < 0.05). (4) ELISA results showed that the level of secondary lymphoid-tissue chemokine in the peripheral blood after 24 hours of irradiation significantly increased (P < 0.05). These findings indicate that the over-expression of CCR7 gene mediated by lentiviral vector can promote the homing of bone marrow mesenchymal stem cells into the spleen.

Key words: SLC/CCR7, bone marrow, mesenchymal stem cells, overexpression of CCR7 gene, stem cell transplantation, cell homing, spleen

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