实用医学杂志 ›› 2022, Vol. 38 ›› Issue (6): 711-714.doi: 10.3969/j.issn.1006⁃5725.2022.06.012

• 基础研究 • 上一篇    下一篇

miR⁃210⁃5p修饰间充质干细胞源外泌体促进大鼠脊髓损伤修复的机制

周永新1 翟文静2 贾志强3 赵晓光1 王磊1 方丽萍4 翟莎菲5 黄涛1   

  1. 1 西安医学院第一附属医院骨科(西安 710077);2 西安交通大学第二附属医院(西安 710004);3 河南科技大学 第二附属医院(河南洛阳 471099);4 西安市人民医院(西安 710068);5 西安医学院口腔医学院(西安 710021)

  • 出版日期:2022-03-25 发布日期:2022-03-25
  • 通讯作者: 黄涛 E⁃mail:zhouyongxin1988@126.com
  • 基金资助:
    国家自然科学基金资助项目(编号:81801237)

Exosomes derived from miR⁃210⁃5p⁃modified mesenchymal stem cells promote recovery after spinal cord injury in rats 

ZHOU Yongxin*,ZHAI Wenjing,JIA Zhiqiang,ZHAO Xiaoguang,WANG Lei,FANG Liping, ZHAI Shafei,HUANG Tao.    

  1. The First Affiliated Hospital of Xi′an Medical College,Xi′an 710077,China 

  • Online:2022-03-25 Published:2022-03-25
  • Contact: HUANG Tao E⁃mail:zhouyongxin1988@126.com

摘要:

目的 探索 miR⁃210⁃5p 修饰间充质干细胞(MSCs)源外泌体对脊髓损伤(SCI)大鼠的治疗作 用。方法 分离、培养 SD 大鼠 MSCs,利用 miRNA⁃210⁃5p mimic NC mimic 转染 MSCs。随后,将 60 只成 年雄性 SD 大鼠随机分为五组,假手术组、SCI 组、MSCs 组、MSCs⁃NC mimic 组和 miR⁃210⁃5p 外泌体组,每组 12 只。用中度挫伤诱导 SD 大鼠 SCI 模型[8]。造模成功后,每天尾静脉注射 200 μL MSCs 外泌体或 NC mimic 外泌体或 miR⁃210⁃5p 外泌体;假手术组和 SCI 模型组每天尾静脉注射 200 μL 的生理盐水溶液,连续 7 d。采用 BBB 量表评估大鼠后肢运动功能;Western blot 检测生长关联蛋白(GAP)⁃43、神经丝蛋白(NF)、 Keap1 和核因子 E2 相关因子 2(Nrf2)蛋白的表达;RT⁃qPCR 检测血红素加氧酶 1(HO⁃1)、醌氧化还原酶 NQO1)的 mRNA 水平。结果 SCI 模型组相比,miR⁃210⁃5p 分泌体组大鼠的 BBB 评分显著升高(P < 0.05)。进一步的研究发现,miR⁃210⁃5p 分泌体组大鼠中 GAP⁃43 的表达被显著抑制(P < 0.05),HO⁃1、NF NQO1 的表达则被增强(P < 0.05),而 Nrf2 的抑制剂 ML385 逆转了 miR⁃210⁃5p 分泌体在 SCI 大鼠中的作用。 结论 miR⁃210⁃5p修饰MSCs 源外泌体通过活化Keap1⁃Nrf⁃2通路促进大鼠的脊髓损伤修复。

关键词: miR?210?5p,  , 间充质干细胞,  , 外泌体,  , 脊髓损伤,  , Keap1?Nrf?2通路,  , 大鼠

Abstract:

Objective To explore the effects of exosomes derived from miR⁃210⁃5p⁃modified mesenchymal stem cells(MSCs)on spinal cord injury(SCI)in rats. Methods MSCs from SD rats were isolated and cultured and were transfected with mirna⁃210⁃5p mimic or NC mimic. Subsequently,60 adult male SD rats were randomly divided into five groups with 12 rats in each group. Except the sham operation group,rats in other four groups underwent T10 laminectomy to construct SCI model. A total of 200 rats were injected with 200 μL MSCs or MSCs NC mimic or miR⁃210⁃5p exosomes or normal saline into caudal vein every day after operation for 14 days. The motor function of hind limbs was evaluated by BBB scale. The expressions of growth associated protein(GAP)⁃43 neurofilament protein(NF),Keap1 and nuclear factor E2 related factor 2(Nrf2)were detected by Western blot. The mRNA levels of heme oxygenase⁃1(HO⁃1)and quinone oxidoreductase(NQO1)were detected by RT qPCR. Results Compared with the SCI model group,the BBB score of miR ⁃ 210⁃5p secretory group was significantly higher(P < 0.05). Further studies showed the expression of GAP⁃43 was significantly inhibited in the miR⁃210⁃5p secretory group,(P < 0.05),while the expression of HO⁃1,NF and NQO1 was enhanced(P < 0.05). Ml385,an inhibitor of Nrf2,reversed the role of miR⁃210⁃5p secretory in SCI rats. Conclusion miR⁃210⁃5p modified MSCs derived exosomes promoted the repair of spinal cord injury in rats by activating keap1⁃nrf⁃2 pathway.

Key words:

miR ?210?5p, mesenchymal stem cells, exosomes, spinal cord injury, the Keap1? Nrf2 pathway, rats