中国组织工程研究 ›› 2022, Vol. 26 ›› Issue (12): 1888-1893.doi: 10.12307/2022.512

• 骨科植入物相关基础实验 Basic experiments of orthopedic implant • 上一篇    下一篇

靶向调控前列腺素内过氧化物合成酶2基因抑制MC3T3-E1细胞的增殖和成骨分化

罗鸣然1,范文豪1,李  鑫1,周  鹏1,吴泽睿1,袁  峰2   

  1. 1徐州医科大学第一临床医学院,江苏省徐州市   221006;2徐州医科大学附属医院骨科,江苏省徐州市   221006
  • 收稿日期:2021-07-30 修回日期:2021-08-02 接受日期:2021-08-13 出版日期:2022-04-28 发布日期:2021-12-14
  • 通讯作者: 袁峰,教授,博士,徐州医科大学附属医院骨科,江苏省徐州市 221006
  • 作者简介:罗鸣然,男,1995年生,江苏省宿迁市人,汉族,徐州医科大学在读硕士,医师,主要从事生物信息学及骨科基础与临床研究。
  • 基金资助:
    江苏省科技厅社会发展项目(BE2016647),项目负责人:袁峰;江苏省卫生计生委科研项目(H201630),项目负责人:袁峰;江苏省研究生科研与实践创新计划项目(KYCX21_2679),项目负责人:罗鸣然

Inhibition of the proliferation and osteogenic differentiation of MC3T3-E1 cells by targeting prostaglandin-endoperoxide synthase 2

Luo Mingran1, Fan Wenhao1, Li Xin1, Zhou Peng1, Wu Zerui1, Yuan Feng2   

  1. 1First Clinical Medical College of Xuzhou Medical University, Xuzhou 221006, Jiangsu Province, China; 2Department of Orthopedics, Affiliated Hospital of Xuzhou Medical University, Xuzhou 221006, Jiangsu Province, China
  • Received:2021-07-30 Revised:2021-08-02 Accepted:2021-08-13 Online:2022-04-28 Published:2021-12-14
  • Contact: Yuan Feng, Professor, MD, Department of Orthopedics, Affiliated Hospital of Xuzhou Medical University, Xuzhou 221006, Jiangsu Province, China
  • About author:Luo Mingran, Master candidate, Physician, First Clinical Medical College of Xuzhou Medical University, Xuzhou 221006, Jiangsu Province, China
  • Supported by:
    Social Development Project of Science and Technology Department of Jiangsu Province, No. BE2016647 (to YF); Scientific Research Project of Jiangsu Provincial Health and Family Planning Commission, No. H201630 (to YF); Postgraduate Research and Practice Innovation Program of Jiangsu Province, No. KYCX21_2679 (to LMR)

摘要:

文题释义:
前列腺素内过氧化物合成酶2:前列腺素内过氧化物合成酶(prostaglandin-endoperoxide synthase,Ptgs)基因编码为环氧合酶(cyclooxygenase,COX)蛋白,COX分为COX1和COX2两型,COX2是催化花生四烯酸合成前列腺素的关键限速酶。
miRNA:miRNA是一种18-25个核苷酸长的非编码RNA,通过识别同源序列来调控转录、翻译和表观遗传过程。
MC3T3-E1细胞:具有自我更新和分化为成骨细胞的能力,并被用作体外研究成骨过程的模型。

背景:骨质疏松症可归因于成骨细胞骨形成和破骨细胞骨吸收之间的不平衡。成骨细胞是骨形成的基础,对于骨骼的生长和维持必不可少,成骨细胞功能的紊乱会导致骨骼生长发育不良和骨质疏松症。然而目前对于成骨细胞成骨分化过程中的关键基因仍不清楚。
目的:使用生物信息学鉴定MC3T3-E1细胞成骨分化过程中的关键基因及其上游miRNA,并验证其对MC3T3-E1细胞成骨分化和增殖的影响。
方法:从基因表达综合数据库(GEO)下载基因表达谱GSE46400成骨诱导数据,使用R语言limma包获得差异表达基因。利用DAVID数据库对DEGs进行了基因本体论(GO)和京都基因和基因组百科全书(KEGG)分析。通过STRING网站建立蛋白-蛋白相互作用(PPI)网络并利用CytoHubba插件筛选网络中的重要模块,以鉴定其中的关键基因。培养MC3T3-E1细胞并分别转染siRNA和miRNA,转染72 h后进行实时荧光定量PCR检测前列腺素内过氧化物合成酶(prostaglandin-endoperoxide synthase,Ptgs)2和骨化相关水平变化,转染72 h后进行Western Blot检测PTGS2蛋白水平变化;转染14 d后进行碱性磷酸酶定量检测;转染21 d后进行茜素红染色及定量检测。
结果与结论:①筛选出差异表达基因229个,其中114个基因表达上调,115个基因表达下调。富集在骨矿化生物学过程的5个基因:Mmp13,Ibsp,Gpnmb,Ptgs2及Aspn均为显著高表达。进一步使用CytoHubba鉴别高表达差异基因中的核心模块中只有Ptgs2参与骨矿化生物学过程,即定义Ptgs2为成骨分化过程的关键基因。②通过Targetscan对Ptgs2上游miRNA进行预测,发现mmu-miR-107-3p可以靶向调控Ptgs2。③在MC3T3-E1细胞中敲减Ptgs2后可以显著抑制细胞增殖和成骨分化(P < 0.05);在转染mmu-miR-107-3p后,细胞的增殖和成骨分化同样被抑制。④双荧光素酶报告基因结果显示mmu-miR-107-3p可以直接靶向抑制Ptgs2的转录(P < 0.05)。⑤mmu-miR-107-3p可以通过靶向Ptgs2进而抑制MC3T3-E1细胞的增殖和成骨分化,Ptgs2可能是MC3T3-E1细胞成骨分化过程中的关键基因。
缩略语:前列腺素内过氧化物合成酶:prostaglandin-endoperoxide synthase,Ptgs

https://orcid.org/0000-0002-5346-3266 (罗鸣然) 

中国组织工程研究杂志出版内容重点:人工关节;骨植入物;脊柱;骨折;内固定;数字化骨科;组织工程

关键词: 生物信息学, 差异表达基因, MC3T3-E1前成骨细胞, 前列腺素内过氧化物合成酶2, mmu-miR-107-3p, 成骨分化, 增殖

Abstract: BACKGROUND: Osteoporosis can be attributed to an imbalance between osteoblastic bone formation and osteoclastic bone resorption. Osteoblasts are the basis of bone formation and are essential for bone growth and maintenance. Disorders of osteoblast function can lead to dysplasia of bone growth and osteoporosis. However, the key genes involved in osteoblast differentiation are still unknown.  
OBJECTIVE: Bioinformatics was used to identify key genes and upstream miRNAs during osteogenic differentiation of MC3T3-E1 cells and verify their effects on osteogenic differentiation and proliferation of MC3T3-E1 cells.
METHODS:  The osteogenic induction data of gene expression profile GSE46400 were downloaded from the Gene Expression Omnibus. Differentially expressed genes for osteogenesis differentiation were obtained with limma package. The Gene Ontology and Kyoto Encyclopedia of Genes and Genomes enrichment analysis of differentially expressed genes were analyzed using DAVID database. The STRING website was used to establish a protein-protein interaction network and CytoHubba plug-in was used to screen the key modules in the network to identify the key genes. MC3T3-E1 cells were cultured and transfected with siRNA and miRNA, separately. The change of prostaglandin-endoperoxide synthase 2 (Ptgs2) and ossification-related gene level was detected by real-time quantitative PCR 72 hours after transfection. The change of PTGS2 protein level was detected by western blot assay 72 hours after transfection. Alkaline phosphatase was quantified 14 days after transfection. Alizarin red staining and quantitative detection were performed 21 days after transfection.  
RESULTS AND CONCLUSION: (1) 229 differentially expressed genes were screened, of which 114 were up-regulated and 115 were down-regulated. Five genes enriched in the biological process of bone mineralization, including Mmp13, Ibsp, Gpnmb, Ptgs2 and Aspn, were highly expressed. Furthermore, CytoHubba was used to identify that only Ptgs2 was involved in the biological process of bone mineralization, and Ptgs2 was defined as a key gene in the process of osteogenic differentiation. (2) The upstream miRNA of Ptgs2 was predicted by Targetscan, and it was found that mmu-miR-107-3p could regulate Ptgs2 in a targeted way. (3) Knockdown Ptgs2 in MC3T3-e1 cells significantly inhibited cell proliferation and osteogenic differentiation (P < 0.05). After transfection of mmu-miR-107-3p, cell proliferation and osteogenic differentiation were also inhibited. (4) Dual luciferase reporter gene results showed that mmu-miR-107-3p could directly inhibit the transcription of Ptgs2 (P < 0.05). (5) mmu-miR-107-3p can inhibit the proliferation and osteogenic differentiation of MC3T3-E1 cells by targeting Ptgs2. Ptgs2 may be a key gene in the osteogenic differentiation of MC3T3-E1 cells.

Key words: bioinformatics, differentially expressed genes, MC3T3-E1 preosteoblast, prostaglandin-endoperoxide synthase 2, mmu-miR-107-3p, osteogenic differentiation, proliferation

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