中国组织工程研究 ›› 2020, Vol. 24 ›› Issue (32): 5097-5101.doi: 10.3969/j.issn.2095-4344.2855

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Shh/Ihh在小鼠胚胎椎间盘形成过程中的表达

巩婷婷1,陈建权1,2   

  1. 1苏州大学医学部骨科研究所,江苏省苏州市  215008;2苏州大学附属第一医院骨科,江苏省苏州市  215008
  • 收稿日期:2019-10-14 修回日期:2019-10-19 接受日期:2019-12-13 出版日期:2020-11-18 发布日期:2020-09-24
  • 通讯作者: 陈建权,博士,教授,苏州大学医学部骨科研究所,江苏省苏州市 215008;苏州大学附属第一医院骨科,江苏省苏州市 215008
  • 作者简介:巩婷婷,女,1992年生,甘肃省正宁县人,汉族,苏州大学在读硕士,主要从事骨发育与再生研究。
  • 基金资助:
    江苏高校优势学科建设工程资助项目(PAPD)

Expression of Shh and Ihh during the formation of intervertebral discs in mouse embryo

Gong Tingting1, Chen Jianquan1, 2   

  1. 1Institute of Orthopedics, Soochow University School of Medicine, Suzhou 215008, Jiangsu Province, China; 2Department of Orthopedics, First Affiliated Hospital of Soochow University, Suzhou 215008, Jiangsu Province, China
  • Received:2019-10-14 Revised:2019-10-19 Accepted:2019-12-13 Online:2020-11-18 Published:2020-09-24
  • Contact: Chen Jianquan, MD, Professor, Institute of Orthopedics, Soochow University School of Medicine, Suzhou 215008, Jiangsu Province, China; Department of Orthopedics, First Affiliated Hospital of Soochow University, Suzhou 215008, Jiangsu Province, China
  • About author:Gong Tingting, Master candidate, Institute of Orthopedics, Soochow University School of Medicine, Suzhou 215008, Jiangsu Province, China
  • Supported by:
    Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)

摘要:

文题释义:

ShhIhh哺乳动物Hedgehog基因存在3种同源基因,分别为Sonic HedgehogIndia Hedgehog以及Desert Hedgehog,分别编码ShhIhh以及Dhh蛋白。它们在胚胎的发育、成体组织和器官干细胞的自我更新与增殖过程中发挥重要的作用。

他莫昔芬是一种选择性雌激素反应调节剂。当向CreERT2小鼠体内注射他莫昔芬时,由他莫昔芬代谢所产生的雌激素类似物与ERT结合,从而使CreERT2进入细胞核内发挥Cre重组酶活性。

背景:研究表明,Sonic Hedgehog(Shh)在小鼠脊索细胞内有表达,India Hedgehog(Ihh)主要在小鼠胚胎椎体的软骨样细胞以及后期形成的终板中表达。但关于Shh以及Ihh在小鼠胚胎椎间盘形成过程中的表达情况并不清楚。

目的:探究Shh Ihh信号在小鼠胚胎椎间盘形成过程中的表达。

方法:将雄性的Shh-CreERT2; R26-mTmG/+小鼠与雌性R26-mTmG/+小鼠进行交配,获取不同时期(E8.5E11.5E12.5E14.5E16.5E18.5)的孕鼠,注射10 g/L的他莫昔芬10 μL/g。当小鼠胚胎处于P0时,取小鼠胚胎椎间盘组织进行基因型鉴定;同时将雄性的C57BL/6小鼠与雌性的C57BL/6小鼠进行交配,获取不同时(E11.5E12.5E14.5E16.5E18.5)孕鼠,取小鼠胚胎椎间盘组织进行分析。通过免疫荧光法检测Shh信号在小鼠胚胎椎间盘形成过程中的表达;免疫组织化学法检测Ihh信号在小鼠胚胎椎间盘形成过程中的表达。所有涉及动物的相关实验均获得苏州大学动物伦理委员会的批准。

结果与结论:①经PCR扩增筛选出基因型为Shh-CreERT2; R26-mTmG/+小鼠胚胎;②免疫荧光染色结果显示,在椎间盘形成过程中,髓核细胞内Shh表达水平逐渐降低;③免疫组织化学染色结果显示,在椎间盘形成过程中,髓核细胞内Ihh表达水平逐渐升高;④结果表明Shh和Ihh在椎间盘形成过程中均发挥调控作用,在一定程度上为研究椎间盘退变的分子机制奠定基础。

ORCID: 0000-0001-9429-2339(巩婷婷)

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: 椎间盘退变, 脊索鞘, 髓核, Shh, Ihh, Shh-CreERT2, R26-mTmG/+

Abstract:

BACKGROUND: Studies have shown that Sonic Hedgehog (Shh) is expressed in mouse Notochordal cells, and India Hedgehog (Ihh) is mainly expressed in chondrocyte-like cells and end plates of mouse embryonic vertebral bodies. However, the expression of Shh and Ihh during the formation of intervertebral discs in mouse embryo is unclear.

OBJECTIVE: To investigate the expression of Shh and Ihh during the formation of intervertebral discs in mouse embryo.

METHODS: Male Shh-CreERT2, R26-mTmG/+ mice mated with female R26-mTmG/+ mice to obtain pregnant rats at different periods of pregnancy (E8.5, E11.5, E12.5, E14.5, E16.5, E18.5), followed by injection of 10 g/L tamoxifen at a dose of 10 μL/g. Intervertebral disc tissues were isolated from the mouse embryo at P0, followed by genotype identification. At the same time, male C57BL/6 mice mated with female C57BL/6 mice to obtain pregnant rats at different periods of pregnancy (E11.5, E12.5, E14.5, E16.5, E18.5), and the intervertebral disc tissues of mouse embryo were taken and analyzed. The expression of Shh and Ihh during the formation of intervertebral discs in mouse embryo was detected using immunofluorescence and immunohistochemistry, respectively. Implementation of animal experiments was approved by the Animal Ethics Committee of Soochow University.

RESULTS AND CONCLUSION: Shh-CreERT2; R26-mTmG/+ mouse embryos were identified by PCR amplification. The results of immunofluorescent staining showed a gradual decrease in the expression of Shh in nucleus pulposus cells during the formation of intervertebral discs in mouse embryo. The results of immunohistochemical staining showed a gradual increase in expression of Ihh in nucleus pulposus cells during the formation of intervertebral discs in mouse embryo. In summary, Shh and Ihh are dynamically expressed during the formation of intervertebral discs in mouse embryo, and provide a basis for further research on the molecular mechanism of intervertebral disc degeneration. 

Key words: intervertebral disc generation, notochord sheath, nucleus pulposus, Shh, Ihh, Shh-CreERT2, R26-mTmG/+

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