中国组织工程研究 ›› 2021, Vol. 25 ›› Issue (5): 674-678.doi: 10.3969/j.issn.2095-4344.2997

• 软骨组织构建 cartilage tissue construction • 上一篇    下一篇

微小RNA-138-5p与软骨细胞增殖和自噬的关系

马泽涛,曾  晖,王德利,翁  鉴,冯  松   

  1. 北京大学深圳医院骨关节科,广东省深圳市   518036
  • 收稿日期:2020-04-07 修回日期:2020-05-07 接受日期:2020-06-05 出版日期:2021-02-18 发布日期:2020-11-28
  • 通讯作者: 曾晖,博士,主任医师,北京大学深圳医院骨关节科,广东省深圳市 518036
  • 作者简介:马泽涛,男,1976年生,广东省汕头市人,汉族,2000年中山医科大学毕业,副主任医师,主要从事骨关节研究。
  • 基金资助:
    深圳市科技计划项目(JCYJ20170307111755218)

MicroRNA-138-5p regulates chondrocyte proliferation and autophagy

Ma Zetao, Zeng Hui, Wang Deli, Weng Jian, Feng Song   

  1. Department of Orthopedics, Peking University Shenzhen Hospital, Shenzhen 518036, Guangdong Province, China
  • Received:2020-04-07 Revised:2020-05-07 Accepted:2020-06-05 Online:2021-02-18 Published:2020-11-28
  • Contact: Zeng Hui, MD, Chief physician, Department of Orthopedics, Peking University Shenzhen Hospital, Shenzhen 518036, Guangdong Province, China
  • About author:Ma Zetao, Associate chief physician, Department of Orthopedics, Peking University Shenzhen Hospital, Shenzhen 518036, Guangdong Province, China
  • Supported by:
    the Scientific Research Plan of Shenzhen, No. JCYJ20170307111755218

摘要:

文题释义:
细胞自噬:细胞在饥饿或其他应激状态下,通过内质网和高尔基体来源的“隔离膜”包裹细胞内部结构形成双层膜结构的自噬小体,自噬小体与细胞内溶酶体融合形成自噬溶酶体并降解胞内物质的过程称为细胞自噬。
基质金属蛋白酶:是一类钙离子依赖的含锌蛋白水解酶,具有保守的催化活性结构域,可以水解细胞外基质、细胞表面受体等。基质金属蛋白酶可以直接参与I型胶原蛋白及聚集蛋白聚糖的降解,促进软骨的退化,而在许多骨关节炎疾病中也发现了基质金属蛋白酶表达上调。

背景:软骨细胞自噬活性的异常会导致软骨组织退行性病变,引发骨关节炎。近年的研究发现mircoRNA在调控软骨细胞自噬过程中发挥了重要的作用,但其作用的分子机制还不太清楚。
目的:探究微小RNA-138-5p(miR-138-5p)对软骨细胞增殖和自噬活性的调节及其作用机制。
方法:体外培养SW1353软骨肉瘤细胞系,对照组细胞转染阴性对照miRNA;实验组细胞转染miR-138-5p模拟物。CCK-8法检测细胞增殖活性,荧光定量PCR实验检测基质金属蛋白酶1,3,13的mRNA表达水平;免疫荧光染色法检测LC3蛋白亚细胞定位,用TargetScan7.1 在线工具预测miR-138-5p与SIRT1信使RNA(mRNA)的作用位点,用蛋白质免疫印迹实验检测自噬相关蛋白和AMPK信号通路蛋白的表达水平。
结果与结论:①与转染阴性对照的细胞相比,转染miR-138-5p模拟物的细胞增殖活性明显下降,细胞内LC3蛋白点状定位减少,且SIRT1、LC3-II、p-AMPK蛋白表达水平下调,p62蛋白表达水平上升,SIRT1 mRNA的3’UTR区域存在一个保守的miR-138-5p结合位点;②与转染对照miRNA的细胞相比,转染miR-138-5p模拟物的细胞中基质金属蛋白酶1,3和13的mRNA表达均有上升;③结果提示,miR-138-5p调控细胞自噬活性和细胞增殖,其作用机制与SIRT1/AMPK信号通路相关;细胞内上调表达的miR-138-5p会促进软骨细胞基质金属蛋白酶的分泌,表明miR-138-5p在骨关节炎疾病进展中发挥了重要的作用。
https://orcid.org/0000-0001-6571-3536 (马泽涛) 

中国组织工程研究杂志出版内容重点:组织构建;骨细胞;软骨细胞;细胞培养;成纤维细胞;血管内皮细胞;骨质疏松;组织工程

关键词: RNA, 骨关节炎, 软骨细胞, 自噬, 通路, 细胞增殖, 基质金属蛋白酶

Abstract: BACKGROUND: Abnormal autophagy in chondrocytes often leads to cartilage degeneration, thereby triggering osteoarthritis. Recent studies have found that microRNAs play an important role in chondrocyte autophagy; however, the molecular mechanism is yet unclear. 
OBJECTIVE: To investigate the role of microRNA-138-5p (miR-138-5p) in the regulation of chondrocyte proliferation and autophagy activities, and to reveal its mechanisms. 
METHODS: Chondrosarcoma cell line SW1353 were cultured in vitro and transfected with negative control miRNA or miR-138-5p mimic. Cell proliferation activity was measured by cell counting kit-8 assay, the expression of matrix metalloproteinases 1, 3, and 13 mRNA was measured by fluorogenic quantitative PCR. The endogenous LC3 subcellular location was detected by immunofluorescence staining. The miR-138-5p and SIRTI mRNA target sites were predicted using TargetScan 7.1 online tool. Autophagy-related proteins and AMPK signal proteins were detected by immunoblotting assay. 
RESULTS AND CONCLUSION: Cells transfected with miR-138-5p mimic, compared with those transfected with negative control miRNA, showed lower proliferation activity, less LC3 puncta, and reduced expression of SIRT1, LC3-II, p-AMPK, but increased protein expression of p62 and increased mRNA expression of matrix metalloproteinases 1, 3, 13. There was a conserved miR-138-5p binding site in the 3’UTR region of SIRT1 mRNA. To conclude, miR-138-5p regulates SW1353 cell autophagy and proliferation through the SIRT1/AMPK signaling pathway. The up-regulated expression of miR-138-5p promotes the secretion of matrix metalloproteinases from chondrocytes, indicating that miR-138-5p plays an important role in the progression of osteoarthritis.

Key words: RNA, osteoarthritis, chondrocytes, autophagy, pathway, cell proliferation, matrix metalloproteinase

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