中国组织工程研究 ›› 2021, Vol. 25 ›› Issue (26): 4112-4117.doi: 10.12307/2021.107

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

miR-98-5p促进成骨细胞增殖和分化的可能及机制

郑  峰,张富财,许  喆   

  1. 青海省人民医院骨科,青海省西宁市   810007
  • 收稿日期:2020-09-11 修回日期:2020-09-12 接受日期:2020-10-30 出版日期:2021-09-18 发布日期:2021-04-19
  • 通讯作者: 郑峰,青海省人民医院骨科,青海省西宁市 810007
  • 作者简介:郑峰,男,1978年生,黑龙江省庆安县人,2014年哈尔滨医科大学毕业,硕士,主任医师,主任,主要从事创伤后骨再生机制以及骨质疏松性骨折方面的研究。
  • 基金资助:
    青海省基础研究计划项目(2020-ZJ-755),项目负责人:郑峰

MicroRNA-98-5p promotes osteoblast proliferation and differentiation: possibilities and mechanisms

Zheng Feng, Zhang Fucai, Xu Zhe   

  1. Department of Orthopedics, Qinghai Provincial People’s Hospital, Xining 810007, Qinghai Province, China
  • Received:2020-09-11 Revised:2020-09-12 Accepted:2020-10-30 Online:2021-09-18 Published:2021-04-19
  • Contact: Zheng Feng, Department of Orthopedics, Qinghai Provincial People’s Hospital, Xining 810007, Qinghai Province, China
  • About author:Zheng Feng, Master, Chief physician, Department of Orthopedics, Qinghai Provincial People’s Hospital, Xining 810007, Qinghai Province, China
  • Supported by:
    the Basic Research Plan of Qinghai Province, No. 2020-ZJ-755 (to ZF)

摘要:

文题释义:
骨折愈合:成骨细胞和破骨细胞在骨折愈合及重塑中发挥重要作用,成骨细胞为间充质细胞,在骨折愈合的骨形成中参与形成新的骨骼,破骨细胞可分泌蛋白酶参与软骨的吸收和重塑。细胞因子和生长因子的释放均可影响成骨细胞和破骨细胞活性,进而影响骨折愈合过程。
磷脂酰肌醇3-激酶/蛋白激酶B/糖原合成酶激酶3β(PI3K/AKT/GSK-3β)信号通路:PI3K/AKT/GSK-3β信号通路在细胞的生长、增殖和分化中起着重要作用,其中PI3K/AKT可通过下游mTOR途径促进细胞存活,参与细胞的代谢、增殖和血管生成。GSK-3β是一种多功能丝氨酸/苏氨酸激酶,可调节能量代谢、细胞生长和凋亡,是PI3K/AKT的下游底物和效应器。机械应力通过介导PI3K/Akt/GSK-3β信号通路可调节骨髓间充质干细胞的成骨过程。

背景:miRNA-98-5p可抑制高迁移率族AT HOOK蛋白2(high mobility group AT-HOOK 2,HMGA2)。磷脂酰肌醇3-激酶/蛋白激酶B/糖原合成酶激酶3β(phosphatidylinositol 3-kinase/alkaline phosphatase/glycogen synthase kinase-3β,PI3K/AKT/GSK-3β)信号通路参与细胞增殖过程。骨折愈合过程中,miR-98-5p是否通过激活HMGA2作用于PI3K/Akt/GSK-3β通路来促进成骨细胞的增殖仍不清楚。
目的:探讨miR-98-5p调控HMGA2和PI3K/AKT/GSK-3β通路促进成骨细胞增殖和分化的机制。 
方法:取MC3T3-E1细胞,通过Lipofectamine 2000分别转染miR-98-5p模拟物和HMGA2质粒到MC3T3-E1细胞,分别为miR-98-5p转染组和HMGA2过表达组;用二甲基亚砜处理的MC3T3-E1细胞及Scramblez乱序质粒转染至MC3T3-E1,分别为转染对照组和空白质粒组;采用脂质体瞬时转染miR-98-5p抑制剂,作为miR-98-5p抑制剂组;不做任何处理的MC3T3-E1细胞作为空白对照组。
结果与结论:①空白对照组和转染对照组的HMGA2、PI3K/Akt/GSK-3β、碱性磷酸酶活性及mRNA水平差异无显著性意义,与转染对照组比,miR-98-5p转染组HMGA2和PI3K/Akt/GSK-3β蛋白表达、细胞分化、细胞增殖,碱性磷酸酶活性及mRNA均显著降低;②Targetscan7.1预测miR-98-5p与HMGA2相互作用结果显示,与转染对照组比,miR-98-5p转染组的HMGA2蛋白和mRNA均降低;与miR-98-5p转染组比,miR-98-5p抑制剂组的HMGA2蛋白和mRNA均增加;③空白对照组和空白质粒组的成骨细胞增殖、碱性磷酸酶活性及mRNA水平差异无显著性意义,与空白质粒组比,HMGA2过表达组的PI3K/Akt/GSK-3β表达、细胞分化程度、MC3T3-E1细胞增殖、碱性磷酸酶活性及mRNA水平均显著增加;④结果显示miR-98-5p可抑制MC3T3-E1细胞的HMGA2和PI3K/Akt/GSK-3β表达,同时抑制细胞的增殖和分化,HMGA2可能是miR-98-5p的直接作用靶点。

https://orcid.org/0000-0003-1033-8059 (郑峰)

关键词: 成骨细胞, 小微RNA98-5p, HMGA2, 磷脂酰肌醇3-激酶, 蛋白激酶B, 糖原合成酶激酶3β, 转染, MC3T3-E1细胞, 增殖, 分化

Abstract:

BACKGROUND: MicroRNA-98-5p (miR-98-5p) can inhibit the high mobility group AT-HOOK 2 (HMGA2). The phosphatidylinositol 3-kinase/alkaline phosphatase/glycogen synthase kinase-3β (PI3K/AKT/GSK-3β) signaling pathway is involved in cell proliferation. During the fracture healing process, it is unclear whether miR-98-5p can act on the PI3K/Akt/GSK-3β pathway by activating HMGA2 to promote the proliferation of osteoblasts.

OBJECTIVE: To investigate the mechanisms of microRNA-98-5p (miR-98-5p) in promoting osteoblast proliferation and differentiation by regulating HMGA2 and PI3K/Akt/GSK-3β pathway. 
METHODS: MC3T3-E1 cells transfected with miR-98-5p mimics and HMGA2 plasmid by Lipofectamine 2000 were divided into a miR-98-5p mimics group and a HMGA2 overexpression group, respectively. MC3T3-E1 cells transfected with dimethyl sulfoxide and scrambled plasmids were divided into a mimic control group and a scramble group. Cells transiently transfected with miR-98-5p inhibitor using liposomes were as a miR-98-5p inhibitor group. Normal MC3T3-E1 cells without treatment were used as a blank control group. 
RESULTS AND CONCLUSION: There were no significant differences in HMGA2, PI3K/Akt/GSK-3β, alkaline phosphatase activity and mRNA level between the blank control group and the mimic control group. Compared with the mimic control group, the HMGA2 and PI3K/Akt/GSK-3β protein expression, cell differentiation and proliferation, alkaline phosphatase activity and mRNA level were significantly reduced in the miR-98-5p mimics group. The interaction between miR-98-5p and HMGA2 predicted by Targetscan7.1 showed that compared with the mimic control group, the HMGA2 protein and mRNA were reduced in the miR-98-5p mimic group, while compared with the miR-98-5p mimic group, the HMGA2 protein and mRNA had an increase in the miR-98-5p inhibitor group. There were no significant differences in osteoblast proliferation, alkaline phosphatase activity and mRNA between the blank control group and the scramble group. Compared with the scramble group, the PI3K/Akt/GSK-3β expression, cell differentiation and proliferation, alkaline phosphatase activity and mRNA in the HMGA2 overexpression group were significantly increased. To conclude, miR-98-5p can inhibit the HMGA2 and PI3K/Akt/GSK-3β expressions in MC3T3-E1 cells, inhibit cell proliferation and differentiation. HMGA2 is possible the direct target of miR-98-5p.

Key words: osteoblasts, microRNA-98-5p, high mobility group AT-HOOK 2, phosphatidylinositol 3-kinase, protein kinase B, glycogen synthase kinase 3β, transfection, MC3T3-E1 cells, proliferation, differentiation

中图分类号: