中国组织工程研究 ›› 2020, Vol. 24 ›› Issue (1): 59-64.doi: 10.3969/j.issn.2095-4344.1844

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miR-132-3p过表达对MC3T3-E1细胞增殖分化的影响

孙  芬1,刘名燕2,刘  铭3,孙心旖3,冯云霞1    

  1. 1山西医科大学口腔医学院▪口腔医院,山西省太原市  030000;2苏州牙博士口腔机构,江苏省苏州市  215000;3山西医科大学基础医学院,山西省太原市  030000
  • 收稿日期:2019-03-23 修回日期:2019-04-02 接受日期:2019-05-23 出版日期:2020-01-08 发布日期:2019-12-12
  • 通讯作者: 冯云霞,教授,山西医科大学口腔医学院▪口腔医院,山西省太原市 030000
  • 作者简介:孙芬,女,1990年生,陕西省渭南市人,2019年山西医科大学毕业,硕士,主要从事正畸学研究。
  • 基金资助:
    国家自然科学基金(81400566)

Effect of microRNA-132-3p overexpression on proliferation and osteogenic differentiation of MC3T3-E1 cells

Sun Fen1, Liu Mingyan2, Liu Ming3, Sun Xinyi3, Feng Yunxia1   

  1. 1Shanxi Medical University School and Hospital of Stomatology, Taiyuan 030000, Shanxi Province, China; 2Dental Doctor, Suzhou 215000, Jiangsu Province, China; 3School of Basic Medical Science, Shanxi Medical University, Taiyuan 030000, Shanxi Province, China
  • Received:2019-03-23 Revised:2019-04-02 Accepted:2019-05-23 Online:2020-01-08 Published:2019-12-12
  • Contact: Feng Yunxia, Professor, Shanxi Medical University School and Hospital of Stomatology, Taiyuan 030000, Shanxi Province, China
  • About author:Sun Fen, Master, Shanxi Medical University School and Hospital of Stomatology, Taiyuan 030000, Shanxi Province, China
  • Supported by:
    the National Natural Science Foundation of China, No. 81400566

摘要:

文题释义:

miRNA:是一类小的非编码RNA,长度约为22个核苷酸,其主要通过结合靶标mRNA的3'UTR区诱导靶标mRNA降解或抑制其翻译,从而在转录及转录后水平调控相关基因的表达。miRNA在细胞增殖、分化及凋亡等多种生物学活动过程中起着非常重要的调控作用,并且发现它是调控骨组织细胞增殖和分化过程的重要因子之一。

MC3T3-E1细胞:是新生C57BL/6小鼠颅顶骨中分离培养所建立的一株成骨细胞株,它能够展现骨组织中成骨细胞的各个发育阶段和各种生物学特性。作为研究成骨细胞增殖和分化的理想模型,被广泛应用于国内外各种骨组织工程学研究。

背景:机械牵引力能够影响MC3T3-E1细胞的增殖分化过程,并引起细胞内miR-132-3p的差异表达。然而,牵引力是否通过调控miR-132-3p的表达来影响成骨细胞增殖分化仍需进一步研究。

目的:明确12%牵引力作用下MC3T3-E1细胞中成骨分化标志因子及miR-132-3p表达变化,并进一步探讨miR-132-3p对细胞增殖分化的影响。

方法:MC3T3-E1细胞分别加载0%,12%牵张应力,检测应力加载后碱性磷酸酶活性、骨钙蛋白及miR-132-3p mRNA的表达水平;细胞内瞬时转染miR-132-3p模拟物及其阴性对照,qRT-PCR检测转染后碱性磷酸酶、骨钙蛋白、Runt标志转录因子2 mRNA的表达,CCK-8法检测miR-132-3p对细胞增殖能力的影响。

结果与结论:①12%牵张应力作用下,MC3T3-E1细胞中碱性磷酸酶活性、骨钙蛋白mRNA表达水平下调(P < 0.01),miR-132-3p表达水平显著升高(P < 0.05);②细胞内转染miR-132-3p后,miR-132-3p模拟物组成骨分化标志因子碱性磷酸酶、骨钙蛋白、Runt标志转录因子2 mRNA表达水平显著降低(P < 0.05);③相比于阴性对照组,miR-132-3p 模拟物转染24,48,72 h后细胞增殖能力明显降低(P < 0.001),且在转染48 h后降低最明显;④结果说明12%周期性循环牵张应力能够通过过表达miR-132-3p负向调节MC3T3-E1细胞的增殖和成骨分化。

ORCID: 0000-0003-0696-3329(孙芬)

中国组织工程研究杂志出版内容重点:干细胞;骨髓干细胞;造血干细胞;脂肪干细胞;肿瘤干细胞;胚胎干细胞;脐带脐血干细胞;干细胞诱导;干细胞分化;组织工程

关键词: 机械牵引力, miR-132-3p, MC3T3-E1细胞, 细胞分化, 碱性磷酸酶, 骨钙蛋白, 细胞增殖, 国家自然科学基金

Abstract:

BACKGROUND: Mechanical stress can influence the proliferation and differentiation of MC3T3-E1 cells and trigger differential expression of miR-132-3p. However, further research is warranted concerning whether tensile stress can influence the proliferation and differentiation of osteoblasts by regulating miR-132-3p.

OBJECTIVE: To determine the expression of osteogenic differentiation markers and miR-132-3p in MC3T3-E1 cells under 12% cyclic stretch and to explore the effect of miR-132-3p on cell proliferation and differentiation.

METHODS: MC3T3-E1 cells were loaded with 0% and 12% tensile stress, and alkaline phosphatase activity, osteocalcin mRNA and miR-132-3p expression levels were detected. MC3T3-E1 cells were transiently transfected with miR-132-3p mimics and a negative control transfection group was set up. The expression of alkaline phosphatase, osteocalcin and Runx2 mRNA in transfected cells were detected by qRT-PCR, and the effect of miR-132-3p on cell proliferation were detected by cell counting kit-8 assay.

RESULTS AND CONCLUSION: The alkaline phosphatase activity and osteocalcin mRNA expression were down-regulated in MC3T3-E1 cells under 12% stretch stress (P < 0.01), and the expression of miR-132-3p was significantly increased (P < 0.05). QRT-PCR results showed the expression levels of osteogenic differentiation markers alkaline phosphatase activity, osteocalcin, and Runx2 mRNA in miR-132-3p mimics group were significantly decreased after intracellular transfection of miR-132-3p (P < 0.05). Compared with the negative control transfection group, the cell proliferation in the miR-132-3p mimic group was decreased at 24, 48, and 72 hours after transfection (P < 0.001), and the most obvious reduction was observed after 48-hour transfection. These findings indicate that 12% cyclic tensile stress can negatively regulate the proliferation and differentiation ability of MC3T3-E1 cells by overexpressing miR-132-3p.

Key words: mechanical stress, miR-132-3p, MC3T3-E1 cells, cell differentiation, alkaline phosphatase, osteocalcin, cell proliferation, National Natural Science Foundation of China

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