中国组织工程研究 ›› 2017, Vol. 21 ›› Issue (4): 538-544.doi: 10.3969/j.issn.2095-4344.2017.04.008

• 骨组织构建 bone tissue construction • 上一篇    下一篇

miR-155通过抑制SMAD5调控成骨细胞骨分化

邱诗阳1,付希佳2,白晓雪3,杨  军1   

  1. 1中国医科大学附属盛京医院南湖院区创伤骨科,辽宁省沈阳市  110004;2朝阳市中心医院神经内科,辽宁省朝阳市  122000;3吉林大学第一医院干部病房,吉林省长春市  130021
  • 收稿日期:2016-12-07 出版日期:2017-02-08 发布日期:2017-03-13
  • 通讯作者: 通讯作者,杨军,博士,副教授,中国医科大学附属盛京医院南湖院区创伤骨科,辽宁省沈阳市 110004
  • 作者简介:邱诗阳,男,1989年生,汉族,山东省宁津县人,中国医科大学在读硕士。
  • 基金资助:

    国家自然科学基金(81600016)

miR-155 regulates the osteogenic differentiation of osteoblasts by inhibiting SMAD5 expression

Qiu Shi-yang1, Fu Xi-jia2, Bai Xiao-xue3, Yang Jun1   

  1. 1Department of Orthopedics and Traumatology, Shengjing Hospital of China Medical University, Shenyang 110004, Liaoning Province, China; 2Department of Neurology, Chaoyang Central Hospital, Chaoyang 122000, Liaoning Province, China; 3Department of Cadre’s Ward, the First Hospital of Jilin University, Changchun 130021, Jilin Province, China
  • Received:2016-12-07 Online:2017-02-08 Published:2017-03-13
  • Contact: Corresponding author: Yang Jun, M.D., Associate professor, Department of Orthopedics and Traumatology, Shengjing Hospital of China Medical University, Shenyang 110004, Liaoning Province, China
  • About author:Qiu Shi-yang, Studying for master’s degree, Department of Orthopedics and Traumatology, Shengjing Hospital of China Medical University, Shenyang 110004, Liaoning Province, China
  • Supported by:

    the National Natural Science Foundation of China, No. 81600016

摘要:

文章快速阅读:

文题释义:
骨形态发生蛋白:能够诱导动物或人体间充质细胞分化为骨、软骨、韧带、肌腱和神经组织。与胚胎骨骼形成有关的蛋白质,在骨形成的数个阶段均起作用,由形态发生的早期阶段开始,并延续至出生后。在中枢神经的发生中也起着关键作用。
靶基因:即目的基因,在分子遗传中,它不仅要具有识别结合功能,还应该具有与位点结合后能表达你所需要的相应功能的作用。
摘要
背景:
诱导成骨细胞分化为骨细胞是组织工程中的研究热点,但分化过程中的调节机制尚未完全阐明。MicroRNA是一类内源性小RNA分子,可通过与靶基因mRNA的3’端非编码区结合在转录后水平调控基因表达。研究证实,microRNA在骨细胞分化过程中起到重要的调节作用。
目的:研究miR-155对成骨细胞骨分化的调节作用以及作用机制。
方法:取小鼠成骨细胞系MC3T3-E1细胞,加入小鼠骨形态发生蛋白2(200 μg/L)进行成骨诱导,并与诱导第1,3,7,14天,通过qRT-PCR检测miR-155 mRNA的表达。并将MC3T3-E1细胞分为对照组、诱导组、miR-155组和miR-155 inhibitor组,对照组用α-MEM培养基培养,诱导组在培养基中加入骨形态发生蛋白2进行成骨诱导,miR-155组和miR-155 inhibitor组在成骨诱导之前分别转染miR-155和miR-155拮抗剂,诱导2周。
结果与结论:①茜素红染色及碱性磷酸酶活性测定:经骨形态发生蛋白2诱导后,miR-155 mRNA表达呈时间依赖性下调。诱导组MC3T3-E1细胞茜素红着色强度、碱性磷酸酶活性和mRNA表达也显著高于对照组(P < 0.01);miR-155组茜素红着色强度明显低于诱导组,碱性磷酸酶活性和mRNA也明显低于对照组(P < 0.01),而miR-155 inhibitor组则呈反向变化(P < 0.05);②荧光报告基因检测和western blot检测:miR-155可与SMAD5 mRNA 3’非编码区结合,并明显降低MC3T3-E1细胞中SMAD5蛋白和mRNA表达(P < 0.01)。结果表明,miR-155可通过负性调控SMAD5表达,抑制MC3T3-E1细胞的成骨分化。

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
ORCID: 0000-0003-2618-0786(杨军)

关键词: 组织构建, 骨细胞, 成骨细胞, microRNA, 分化, 小鼠, SMAD5, 细胞, 碱性磷酸酶, qRT-PCR, mRNA, 国家自然科学基金

Abstract:

Abstract
BACKGROUND
: Induction of osteoblasts differentiating into osteocytes is a hot spot in tissue engineering; however, the regulatory mechanism underlying differentiation has not been fully elucidated. MicroRNA, as an endogenous small RNA molecule, can regulate post-transcriptional gene expression by binding to the 3’ nontranslated region of the target gene mRNA, which also has been found to play an important regulatory role in osteocyte differentiation.
OBJECTIVE: To study the regulation of miR-155 on osteoblast differentiation and the underlying mechanism.
METHODS: The mouse osteoblast cell lines MC3T3-E1 were selected and induced by mouse bone morphogenetic protein-2 (BMP2, 200 ng/mL) and then the miR-155 mRNA expression was determined by quantitative real-time PCR at 1, 3, 7 and 14 days. MC3T3-E1 cells were divided into control, BMP2, miR-155 and miR-155 inhibitor groups, followed by cultured with α-MEM medium, BMP2, miR-155 and miR-155 inhibitor, respectively, for 2 weeks.
RESULTS AND CONCLUSION: After induction using BMP2, miR-155 expression was downregulated in a time dependent manner. The staining intensity of alizarin red in the BMP2 group was significantly higher than that of the control group, and the activity of alkaline phosphatase and mRNA expression were also significantly higher than those in the control group (P < 0.01). The staining intensity of alizarin red, activity of alkaline phosphatase and mRNA expression in the miR-155 group were significantly lower than those in the control group (P < 0.01), while all above measurements were reversed significantly by miR-155 inhibitor (P < 0.05). miR-155 could bind to the 3’ untranslated region of SMAD5 mRNA and significantly downregulated the expressions of SMAD5 protein and mRNA in MC3T3-E1 cells (P < 0.01). These results show that miR-155 can inhibit MC3T3-E1osteogenic differentiation by downregulating SMAD5 expression.

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

Key words: Tissue Engineering, Alkaline Phosphatase, Bone Morphogenetic Proteins

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