上海交通大学学报（医学版）

上海交通大学学报（医学版） >

2023 , Vol. 43 >Issue 4: 406 - 416

DOI: https://doi.org/10.3969/j.issn.1674-8115.2023.04.002

论著 · 基础研究

骨髓间充质干细胞来源小细胞外囊泡对骨质疏松症的改善作用

  • 李旭冉 ,
  • 陶诗聪 ,
  • 郭尚春
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  • 1.上海交通大学医学院附属第六人民医院骨科，上海 200233
    2.上海交通大学医学院六院临床医学院，上海 200233
    3.上海交通大学医学院附属第六人民医院四肢显微外科研究所，上海 200233
李旭冉（1999—），男，硕士生；电子信箱：15737905921@163.com。
陶诗聪，电子信箱：sctao@shsmu.edu.cn。
郭尚春，电子信箱：scguo@shsmu.edu.cn

收稿日期: 2022-12-23

  录用日期: 2023-03-27

  网络出版日期: 2023-04-28

基金资助

国家自然科学基金(81802226);上海市浦江人才计划(2019PJD038);2020年上海市“医苑新星”青年医学人才培养资助计划;上海市第六人民医院优秀人才培育项目(ynyq202101);上海交通大学医学院“双百人”项目(2022-017)

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Ameliorative effects on osteoporosis of small extracellular vesicles derived from bone marrow mesenchymal stem cells

  • Xuran LI ,
  • Shicong TAO ,
  • Shangchun GUO
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  • 1.Department of Orthopedic Surgery, Shanghai Sixth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 200233, China
    2.Clinical Medical College of Shanghai Sixth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 200233, China
    3.Institute of Microsurgery on Extremities, Shanghai Sixth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 200233, China
TAO Shicong, E-mail: sctao@shsmu.edu.cn.
GUO Shangchun, E-mail: scguo@shsmu.edu.cn

Received date: 2022-12-23

  Accepted date: 2023-03-27

  Online published: 2023-04-28

Supported by

National Natural Science Foundation of China(81802226);Shanghai Pujiang Program(2019PJD038);Shanghai “Rising Stars of Medical Talent” Youth Development Program in 2020;Shanghai Sixth People's Hospital Funding(ynyq202101);"Two-hundred Talents" Program of Shanghai Jiao Tong University School of Medicine(2022-017)

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摘要

目的·探究人骨髓间充质干细胞（bone marrow mesenchymal stem cell，BMSC）来源的小细胞外囊泡（small extracellular vesicle，sEV）对小鼠破骨细胞分化和巨噬细胞极化的调控作用，以及对骨质疏松症小鼠的影响。方法·培养BMSC并通过差速离心法提取sEV，通过透射电子显微镜（transmission electron microscope，TEM）及纳米颗粒跟踪分析技术（nanoparticle tracking analysis，NTA）鉴定得到的sEV。通过巨噬细胞集落刺激因子（macrophage colony-stimulating factor，M-CSF）及核因子κB受体激活蛋白配体（receptor activator of nuclear factor-κB ligand，RANKL）刺激RAW264.7细胞以诱导形成破骨细胞，通过抗酒石酸酸性磷酸酶（tartrate-resistant acid phosphatase，TRAP）染色及鬼笔环肽染色检测sEV对破骨细胞分化的调控作用。通过荧光定量PCR检测sEV对破骨细胞标志基因环磷腺苷效应元件结合蛋白（cAMP-response element binding protein，CREB）、组织蛋白酶K（cathepsin K，CTSK）及c-Jun（Jun proto-oncogene）mRNA表达量的影响。使用脂多糖刺激RAW264.7细胞极化为M1型巨噬细胞；使用白细胞介素-4（interleukin-4，IL-4）及IL-13刺激RAW264.7细胞极化为M2型巨噬细胞。利用流式细胞术检测sEV对M1及M2型巨噬细胞极化的影响。通过微计算机断层扫描成像（micro-computed tomography，micro-CT）及TRAP染色观察sEV对骨质疏松症小鼠模型腰椎骨组织的影响。结果·TEM及NTA结果显示分离得到的sEV具有典型的球状结构，直径为30~150 nm。TRAP染色及鬼笔环肽染色结果显示，BMSC来源的sEV能够有效抑制RAW264.7细胞融合形成破骨细胞。PCR结果表明sEV能够降低CREB、CTSK和c-Jun mRNA的表达量（均P<0.05）。流式细胞术分析表明，BMSC来源的sEV能够抑制RAW264.7细胞极化为M1型巨噬细胞，促进其极化为M2型巨噬细胞。Micro-CT检测结果显示，sEV干预后模型小鼠腰椎骨小梁数量和骨体积分数显著高于未干预小鼠（均P<0.05）；TRAP染色结果显示，sEV干预后腰椎组织中的破骨细胞数量减少。结论·人BMSC来源的sEV可以延缓骨质疏松小鼠的骨质流失，这可能与其抑制小鼠破骨细胞分化及促进M2型巨噬细胞极化的作用有关。

关键词： 骨髓间充质干细胞; 小细胞外囊泡; 骨质疏松症; 破骨细胞; 巨噬细胞极化

本文引用格式

李旭冉 , 陶诗聪 , 郭尚春 . 骨髓间充质干细胞来源小细胞外囊泡对骨质疏松症的改善作用[J]. 上海交通大学学报（医学版）, 2023 , 43(4) : 406 -416 . DOI: 10.3969/j.issn.1674-8115.2023.04.002

Abstract

Objective ·To investigate the effects of small extracellular vesicles (sEVs) derived from human bone marrow mesenchymal stem cells (BMSCs) on the regulation of osteoclast differentiation and macrophage polarization in mice, and mouse model of osteoporosis. Methods ·BMSCs were cultured and sEVs were isolated through differential centrifugation. The isolated sEVs were identified by transmission electron microscopy (TEM) and nanoparticle tracking analysis (NTA). RAW264.7 cells were cultured and stimulated with macrophage colony-stimulating factor (M-CSF) and receptor activator of nuclear factor-κB ligand (RANKL) to differentiate the cells into osteoclasts. Tartrate-resistant acid phosphatase (TRAP) staining and phalloidin staining were performed to assess the effect of sEVs on osteoclast formation. The expression levels of osteoclast marker genes, i.e., cAMP-response element binding protein (CREB), cathepsin K (CTSK), and Jun proto-oncogene (c-Jun) were examined by real-time quantitative PCR. To polarize RAW264.7 cells to M1 phenotype, they were cultured with lipopolysaccharides; to polarize them to M2 phenotype, they were cultured with interleukin-4 (IL-4) and IL-13. Flow cytometry was performed to detect the effect of sEVs on macrophage polarization. Micro-computed tomography (micro-CT) and TRAP staining were performed to investigate the effect of sEVs on the bone tissues of lumbar vertebrae in osteoporosis mouse models. Results ·TEM and NTA demonstrated that the isolated sEVs had a typical globular structure with a diameter ranging from 30?150 nm. TRAP staining and phalloidin staining showed that BMSC-derived sEVs inhibited the fusion of RAW264.7 cells to form osteoblasts. PCR revealed that sEVs could decrease the expression of CREB, CTSK, and c-Jun (all P<0.05). Flow cytometry analysis indicated that BMSC-derived sEVs inhibited RAW264.7 macrophages polarization to M1 phenotype and induced RAW264.7 macrophages polarization to M2 phenotype. Micro-CT indicated that the number of trabeculae and the bone volume fraction of lumbar vertebrae were significantly higher in the sEV-intervened group than those in the control group (both P<0.05). TRAP staining revealed a reduction of osteoclast number in the lumbar vertebrae after intervention with sEVs. Conclusion ·The sEVs from human BMSCs can delay bone loss in osteoporosis mice, which may be related to its effects of inhibiting osteoclast differentiation and promoting the polarization of M2 type macrophages.

Key words： bone marrow mesenchymal stem cell (BMSC); small extracellular vesicle (sEV); osteoporosis; osteoclast; macrophage polarization

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