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中华关节外科杂志(电子版) ›› 2021, Vol. 15 ›› Issue (04) : 423 -431. doi: 10.3877/cma.j.issn.1674-134X.2021.04.006

基础论著

外泌体对大鼠骨关节炎软骨细胞凋亡的影响
黄涛1, 方红育1,(), 周少怀1, 卞峰1, 李宏亮1, 任敏1, 范明宇1, 汪平1, 谢西茜1, 张莹1, 黄娅芬1, 李静1   
  1. 1. 430060 武汉市第三医院骨科
  • 收稿日期:2020-09-23 出版日期:2021-09-29
  • 通信作者: 方红育
  • 基金资助:
    湖北省卫生健康委员会科研项目(WJ2019F005)

Effect of exosomes on chondrocyte apoptosis in osteoarthritis rats

Tao Huang1, Hongyu Fang1,(), Shaohuai Zhou1, Feng Bian1, Hongliang Li1, Min Ren1, Mingyu Fan1, Ping Wang1, Xixi Xie1, Ying Zhang1, Yafen Huang1, Jing Li1   

  1. 1. Department of Orthopedics of the Third Hospital of Wuhan, Wuhan 430060, China
  • Received:2020-09-23 Published:2021-09-29
  • Corresponding author: Hongyu Fang
引用本文:

黄涛, 方红育, 周少怀, 卞峰, 李宏亮, 任敏, 范明宇, 汪平, 谢西茜, 张莹, 黄娅芬, 李静. 外泌体对大鼠骨关节炎软骨细胞凋亡的影响[J]. 中华关节外科杂志(电子版), 2021, 15(04): 423-431.

Tao Huang, Hongyu Fang, Shaohuai Zhou, Feng Bian, Hongliang Li, Min Ren, Mingyu Fan, Ping Wang, Xixi Xie, Ying Zhang, Yafen Huang, Jing Li. Effect of exosomes on chondrocyte apoptosis in osteoarthritis rats[J]. Chinese Journal of Joint Surgery(Electronic Edition), 2021, 15(04): 423-431.

目的

探讨人脐带间充质干细胞来源外泌体(huc-MSCs-exo)对骨关节炎(OA)大鼠软骨凋亡的影响。

方法

取健康、足月剖宫产新生儿脐带,分离并提取huc-MSCs-exo,选取Wistar大鼠30只,随机分为假手术组、模型组及治疗组(各10只),模型组及治疗组制备OA模型大鼠,治疗组成模后关节腔内注射huc-MSCs-exo 100 μg,治疗8周后;比较各组大鼠步态障碍评分、软骨组织形态学变化、软骨细胞凋亡情况及一氧化氮(NO)表达;Real-time PCR检测软骨组织肿瘤坏死因子(TNF)-α、白细胞介素(IL)-1β、IL-4、B细胞淋巴瘤基因-2(Bcl-2)、Bcl-2相关X蛋白(Bax)mRNA表达。另取12只大鼠,6只正常饲养、6只进行膝OA造模,模型成功后分离、培养OA软骨细胞并染色鉴定;正常软骨细胞为对照组,OA软骨细胞培养后分为OA组和实验组,实验组软骨细胞加入1 g/L huc-MSCs-exo 0.2 ml培养,对照组及OA组软骨细胞给予同体积磷酸盐缓冲液培养,3组细胞均培养24 h,LSD t检验比较各组细胞增殖抑制率、凋亡情况及NO表达。

结果

治疗组与模型组比较,治疗组大鼠步态障碍评分降低(t=5.49,P<0.001),NO含量降低(t=15.69,P<0.001),凋亡指数(AI)值降低(t=7.42,P<0.001),TNF-α表达量降低(t=5.74,P<0.001),IL-1β表达量降低(t=17.22,P<0.001)、IL-4表达量降低(t=11.33,P<0.001),Bax mRNA表达量降低(t=19.51,P<0.001),Bcl-2 mRNA表达量升高(t=10.12,P<0.001),差异均具有统计学意义。

结论

Huc-MSCs-exo可有效改善膝骨OA大鼠软骨细胞凋亡情况,其机制可能与改善炎症反应有关。

Objective

To investigate the effect of human umbilical cord mesenchymal stem cell derived exosomes (huc-MSCs-exo) on cartilage apoptosis in osteoarthritis (OA) rats.

Methods

Huc-MSCs-exo was isolated and extracted from the umbilical cord of healthy and full-term cesarean section newborns. Thirty Wistar rats were randomly divided into sham operation group, model group and treatment group (10 rats in each group). OA model rats were prepared in the model group and treatment group. Huc-MSCs-exo 100μg was injected into the articular cavity after treatment. After eight weeks of treatment, the gait disorder score, cartilage histomorphological changes, chondrocyte apoptosis and nitric oxide (NO) expression were compared. Detection of tumor necrosis factor -α(TNF- α) in cartilage by real time PCR、interleukin(IL)-1β、IL-4, B-cell lymphoma gene-2 (Bcl-2) and Bcl-2 related X protein (Bax) mRNA expression. Another 12 rats were chosen, among which sixratswere normalfed and the other six rats were used for knee OA modeling. After the models were succeeded, OA chondrocytes were isolated, cultured and stained. The normal chondrocytes were used as the control group, and the OA chondrocytes were also cultured and divided into the OA group and the experimental group. The experimental group were cultured with 1g/L huc-MSCs-exo 0.2 ml, while the control group and the OA group were cultured with phosphate buffer. The three groups of cells were cultured for 24 h. The inhibition rate of cell proliferation, apoptosis and NO expression were compared by LSD t test.

Results

Compared with the model group, in the treatment group, the gait disorder score decreased (t =5.49, P<0.001), the content of no decreased (t=15.69, P<0.001), the value of apoptosis index (AI) decreased (t=7.42, P<0.001). The expression of TNF- α and IL-1β decreased (t =5.74, P <0.001) (t=17.22, P<0.001), the expression of IL-4 decreased (t=11.33, P<0.001), the expression of Bax mRNA decreased (t=19.51, P<0.001), while the expression of bcl-2 mRNA increased (t=10.12, P<0.001).

Conclusion

Huc-MSCs-exocan effectively improve chondrocyte apoptosis in knee OA rats, and its mechanism may be related to improving inflammatory response.

表1 引物序列
图1 Huc-MSCs(人脐带间充质干细胞)表面标记CD44、CD34免疫荧光染色(×400)
图2 Huc-MSCs-exo(人脐带间充质干细胞来源外泌体)透射电镜检测结果(×5 000)
图3 各组大鼠软骨组织HE(苏木素-伊红)染色。图A~B为假手术组大鼠软骨组织HE染色,图B为图A局部放大,示假手术组大鼠软骨组织边缘整齐,细胞排列有序,细胞核清晰,关节面及滑膜结构完整;图C~D为模型组大鼠软骨组织HE染色,图D为图C局部放大,示模型组大鼠关节软骨破坏严重,边缘不整,骨细胞及软骨细胞核压缩,符合膝OA病理变化;图E~F为治疗组软骨组织HE染色,图F为图E局部放大,示治疗组大鼠关节面软骨细胞结构有所改善,但软骨表面光滑程度仍欠佳
图4 各组大鼠软骨组织细胞TUNEL(原位末端标记技术)染色(×40)。图A为假手术组大鼠软骨组织细胞TUNEL染色,图B为模型组大鼠软骨组织细胞TUNEL染色,图C为治疗组大鼠软骨组织细胞TUNEL染色,示治疗组、假手术组、模型组细胞凋亡情况依次升高
图5 各组大鼠软骨组织TNF(肿瘤坏死因子)-α、IL(白介素)-1β、IL-4、Bax(B淋巴细胞瘤基因相关蛋白)及Bcl(B淋巴细胞瘤基因)-2 mRNA表达变化(n=10)
图6 分离软骨细胞软骨Ⅱ型胶原蛋白鉴定染色(×200)
图7 各组软骨细胞增殖抑制率变化情况
图8 流式细胞仪检测各组软骨细胞凋亡情况
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