中国组织工程研究 ›› 2019, Vol. 23 ›› Issue (5): 767-772.doi: 10.3969/j.issn.2095-4344.0541

• 干细胞基础实验 basic experiments of stem cells • 上一篇    下一篇

同源性磷酸酶-张力蛋白经PI3K/AKT通路调控关节纤维化肌成纤维细胞增殖

庄 泽,余东杰,易小友,肖大海,江诗海,何容涵,王 昆   

  1. 中山大学附属第三医院关节创伤外科,广东省广州市  510630
  • 修回日期:2018-04-02 出版日期:2019-02-18 发布日期:2019-02-18
  • 通讯作者: 王昆,博士,主任医生,中山大学附属第三医院关节创伤外科,广东省广州市 510630
  • 作者简介:庄泽,男,1984年生,广东省普宁市,汉族,2014年中山大学毕业,硕士,主治医师,主要从事为关节置换、运动医学、四肢创伤及软组织修复方面的研究。
  • 基金资助:

    广东省医学科研基金项目(A2016066);广东省中医药科学技术研究项目(20181061)

Phosphatase and tensin homolog regulates arthrofibrotic myofibroblast proliferation via PI3K/AKT signaling pathways

Zhuang Ze, Yu Dongjie, Yi Xiaoyou, Xiao Dahai, Jiang Shihai, He Ronghan, Wang Kun   

  1. Department of Joint Traumatology, the Third Affiliated Hospital of Sun Yat-Sen University, Guangzhou 510630, Guangdong Province, China
  • Revised:2018-04-02 Online:2019-02-18 Published:2019-02-18
  • Contact: Wang Kun, MD, Chief physician, Department of Joint Traumatology, the Third Affiliated Hospital of Sun Yat-Sen University, Guangzhou 510630, Guangdong Province, China
  • About author:Zhuang Ze, Master, Attending physician, Department of Joint Traumatology, the Third Affiliated Hospital of Sun Yat-Sen University, Guangzhou 510630, Guangdong Province, China
  • Supported by:

    the Medical Scientific Research Foundation of Guangdong Province, No. A2016066; a grant from the Scientific Research Project of Traditional Chinese Medicine of Guangdong Province, No. 20181061

摘要:

文章快速阅读:

文题释义:
PTEN基因:
第10号染色体缺失的磷酸酶及张力蛋白同源的基因,位于10号染色体长臂,是一个具有双特异性磷酸酶活性的抑癌基因,编码由403个氨基酸组成的蛋白质,可诱导细胞凋亡及细胞周期阻滞,抑制肿瘤发生,目前已发现其在肾癌、肺癌、乳腺癌等多种恶性肿瘤中存在表达缺失或低表达。近年来发现PTEN基因在肝、肺、肾的纤维化亦有抑制纤维增殖的作用。
关节纤维化:关节周围发生骨折、开放性创伤等外力损伤后或者关节手术后关节邻近纤维组织的异常增生,肌成纤维细胞异常增生,患者术后出现关节活动屈伸,旋转受限,活动度丢失,严重者出现关节僵硬,影响正常生活质量和工作能力的一种病理改变。

 

摘要
背景:
研究显示大鼠关节纤维化中相关调控肌成纤维细胞表达的基因目前报导较少,对抑癌基因同源性磷酸酶-张力蛋白(phosphatase and tensin homolog,PTEN)在关节纤维化组织的表达目前尚未见报道。
目的:探讨关节纤维化大鼠关节囊组织中PTEN基因的表达变化及下游PI3K/AKT信号通路在大鼠关节纤维化中的作用。
方法:膝关节固定法建立大鼠膝关节纤维化模型,取膝关节后关节囊,组织块培养法分离培养肌成纤维细胞。采用定量实时PCR检测PTEN mRNA的表达,采用蛋白质印迹Western Blot方法检测肌成纤维细胞中胶原蛋白1-A1、PTEN蛋白的表达情况及下游PI3K,AKT通路的信号分子改变情况。再使用PI3K/AKT通路阻滞剂LY294002对肌成纤维细胞进行处理,观察肌成纤维细胞的增殖改变情况。
结果与结论:关节纤维化中PTEN mRNA及蛋白表达水平较对照侧下调(P < 0.05)。PTEN表达下调后,下游PI3K/AKT通路的信号分子PI3K,p-AKT的表达水平出现上调(P < 0.05),肌成纤维细胞的细胞增殖活跃,使用PI3K/AKT通路阻滞剂LY294002后细胞增殖受到抑制。提示纤维化关节中PTEN表达发生下调,并经由PI3K/AKT通路调控关节纤维化的发展。


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
ORCID: 0000-0002-3312-4347(庄泽)

关键词: 肌成纤维细胞, 关节, 纤维化, PTEN, PI3K/AKT通路, 关节挛缩, 固定, 增殖, 组织构建

Abstract:

BACKGROUND: There are few reports about the genes that regulate the expression of myofibroblasts in rats with arthrofibrosis. The expression of tumor suppressor gene phosphatase and tensin homolog (PTEN) in fibrosis tissues has not yet been reported.
OBJECTIVE: To investigate the expression of PTEN gene in articular capsule tissue in rats with arthrofibrosis and the significance of PI3K/AKT signaling pathway in arthrofibrosis. 
METHODS: The rat model of arthrofibrosis was established by knee fixation, and the posterior articular capsule of knee joint was removed. Myofibroblasts were isolated and cultured by tissue explant method. The expression level of PTEN mRNA was detected by quantitative real-time PCR. The protein expression levels of COL1-A1, and PTEN in myofibroblasts and the signal molecules change in downstream PI3K/AKT signaling pathway were detected by western blot assay. The PI3K/AKT signal pathway specific blocker LY294002 was used to observe the changes of myofibroblast proliferation.
RESULTS AND CONCLUSION: The expression levels of PTEN mRNA and protein in arthrofibrosis were significantly down-regulated compared with the normal articular group (P < 0.05). The down-regulated expression level of PTEN could up-regulate the expression levels of PI3K and AKT signaling molecules (P < 0.05) and enhanced the proliferation of myofibroblasts. After application of the PI3K/AKT blocker LY294002, the proliferation of myofibroblasts was inhibited. Our results suggest that there is a down-regulation in PTEN expression in articular capsule tissue of rats with arthrofibrosis, and PTEN regulates the development of articular capsule tissue fibrosis via PI3K/AKT signaling pathway. 


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

Key words: Fibrosis, Fibroblasts, Tissue Engineering

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