中国组织工程研究 ›› 2025, Vol. 29 ›› Issue (25): 5374-5381.doi: 10.12307/2025.528

• 干细胞培养与分化 stem cell culture and differentiation • 上一篇    下一篇

细胞周期蛋白依赖性激酶7抑制剂THZ1对脑胶质瘤干细胞干性的调控及机制

虎恩喜1,何文莹2,陶  翔1,杜沛静1,王立斌1,3   

  1. 1宁夏医科大学第一临床医学院,宁夏回族自治区银川市   750004;2宁夏医科大学基础医学院,宁夏回族自治区银川市   750004;3华中科技大学协和深圳医院,广东省深圳市   518000
  • 收稿日期:2024-05-15 接受日期:2024-07-10 出版日期:2025-09-08 发布日期:2024-12-25
  • 通讯作者: 王立斌,博士,教授,宁夏医科大学第一临床医学院,宁夏回族自治区银川市 750004;华中科技大学协和深圳医院,广东省深圳市 518000
  • 作者简介:虎恩喜,女,1999年生,贵州省威宁彝族回族苗族自治县人,回族,宁夏医科大学在读硕士,主要从事肿瘤细胞生物学相关研究。
  • 基金资助:
    深圳市科创委基础研究面上项目(深圳自然科学基金)(JCYJ20230807115807015),项目负责人:王立斌;国家自然科学基金项目(82260610),项目负责人:王立斌;宁夏医科大学校级教育教学改革研究重点项目(NYJY2022011),项目负责人:王立斌

Regulation of THZ1, an inhibitor of cyclin-dependent kinase 7, on stemness of glioma stem cells and its mechanism

Hu Enxi1, He Wenying2, Tao Xiang1, Du Peijing1, Wang Libin1, 3   

  1. 1First Clinical Medical College of Ningxia Medical University, Yinchuan 750004, Ningxia Hui Autonomous Region, China; 2Basic Medicine College, Ningxia Medical University, Yinchuan 750004, Ningxia Hui Autonomous Region, China; 3Union Shenzhen Hospital, Huazhong University of Science and Technology, Shenzhen 518000, Guangdong Province, China
  • Received:2024-05-15 Accepted:2024-07-10 Online:2025-09-08 Published:2024-12-25
  • Contact: Wang Libin, MD, Professor, First Clinical Medical College of Ningxia Medical University, Yinchuan 750004, Ningxia Hui Autonomous Region, China; Union Shenzhen Hospital, Huazhong University of Science and Technology, Shenzhen 518000, Guangdong Province, China
  • About author:Hu Enxi, Master candidate, First Clinical Medical College of Ningxia Medical University, Yinchuan 750004, Ningxia Hui Autonomous Region, China
  • Supported by:
    Shenzhen Science and Technology Innovation Commission Basic Research General Project (Shenzhen Natural Science Foundation), No. JCYJ20230807115807015 (to WLB); National Natural Science Foundation of China, No. 82260610 (to WLB); Key Project of Ningxia Medical University-Level Education and Teaching Reform Research, No. NYJY2022011 (to WLB)

摘要:

文题释义:

THZ1:是细胞周期蛋白依赖性激酶7的一种选择性共价抑制剂,具有抗肿瘤作用。作为一种极具抗癌潜力的小分子抑制剂,可以通过靶向细胞周期蛋白依赖性激酶7而抑制细胞周期,同时抑制细胞周期蛋白依赖性激酶7与转录因子结合,阻断RNA聚合酶Ⅱ激活,调控基因转录过程;在表观遗传研究中,THZ1可以减弱超级增强子对靶基因转录的促进作用,从而抑制癌基因的表达。
肿瘤干细胞:是一群存在于异质性肿瘤组织中的细胞亚群,具有多谱系分化的特征。肿瘤干细胞通过自我更新和无限增殖维持着肿瘤细胞群的生命力,对肿瘤存活、远处转移、治疗耐药性及复发有重要作用,是癌症发生发展的重要驱动因素,也是导致癌症治疗失败的重要原因。
Wnt/β-catenin信号通路:也称为经典Wnt信号通路,是一种保守的信号转导轴,参与细胞多种生理过程,如增殖、分化、凋亡、迁移、侵袭和组织稳态。目前已有研究报道该信号通路的活化与肿瘤干细胞形成和上皮-间充质转化过程相关,当细胞质中β-catenin水平升高时,其转运入核并与TCF/LEF转录因子家族成员结合,取代辅助抑制因子并招募转录因子和转录辅助激活因子,促进Myc、细胞周期蛋白D1等多种癌基因表达。

摘要
背景:THZ1是一种细胞周期蛋白依赖性激酶7的抑制剂,可以抑制多种肿瘤细胞的增殖,但THZ1是否可以通过Wnt/β-catenin信号通路影响脑胶质瘤干细胞的干性尚不清楚。
目的:探究THZ1对脑胶质瘤细胞U87干性的影响及机制。
方法:培养脑胶质瘤细胞U87形成干细胞球并通过Western blot验证干性相关蛋白的表达;采用CCK-8法检测THZ1作用于U87细胞的半数抑制浓度(IC50);通过克隆实验、划痕实验、Transwell迁移实验确定THZ1对U87细胞增殖、迁移的影响;分析THZ1处理对U87干细胞成球率及干细胞球体大小的影响;Western blot检测干性相关蛋白CD133、ABCG2、Nanog、OCT4、SOX2和上皮-间充质转化相关蛋白E-cadherin、N-cadherin、Occludin、Snail以及Wnt/β-catenin通路相关蛋白Axin1、β-Catenin、Wnt-5a、GSK3β、Cyclind-1、C-myc的表达变化。
结果与结论:①与贴壁细胞相比,U87干细胞干性相关蛋白Nestin、CD133、ABCG2、Nanog、OCT4、SOX2表达明显升高;②与对照组相比,THZ1减弱了U87细胞的增殖和迁移能力;③THZ1抑制U87干细胞成球率及球体大小,下调干性相关蛋白的表达;④THZ1处理后,U87干细胞中N-cadherin、Snail蛋白表达降低,而E-cadherin、Occludin蛋白表达升高;⑤THZ1处理使U87干细胞中Wnt/β-catenin通路相关蛋白Axin1、β-Catenin、Wnt-5a、GSK3β、Cyclind-1、C-myc表达降低。结果表明:THZ1通过下调Wnt/β-catenin信号通路相关分子表达,抑制脑胶质瘤细胞U87的增殖、迁移,抑制U87干细胞成球能力、干性相关蛋白表达和上皮-间充质转化能力。

关键词: THZ1, 脑胶质瘤, 肿瘤干细胞, 成球实验, 干性标志物, Wnt/β-catenin信号通路, 上皮-间充质转化, 增殖, 迁移

Abstract: BACKGROUND: THZ1, an inhibitor of cyclin-dependent kinase 7, has been shown to inhibit the proliferation of a variety of tumor cells, but whether THZ1 can affect the stemness of glioma stem cells through the Wnt/β-catenin signaling pathway remains unclear. 
OBJECTIVE: To investigate the effect of THZ1 on stemness of glioma cell U87 and its mechanism. 
METHODS: U87 adherent cells were cultured to form stem cell mammospheres. The expressions of stemness related proteins were verified by western blot assay. The effect of THZ1 on half maximal inhibitory concentration (IC50) of U87 cells was determined by Cell Counting Kit-8 (CCK-8) assays. The effects of THZ1 on proliferation and migration of U87 cells were determined by cell colony-formation assays, cell wound healing assays, and Transwell migration assays. The effect of THZ1 treatment on mammosphere forming rate and mammosphere size of U87 stem cells was analyzed. Stemness associated proteins CD133, ABCG2, Nanog, OCT4, SOX2, epithelial-mesenchymal transformation-related proteins E-cadherin, N-cadherin, Occludin, Snail, and Wnt/β-catenin pathway associated proteins Axin1, β-Catenin, WNT-5A, GSK3β, Cyclind-1, and C-myc were measured by western blot assay. 
RESULTS AND CONCLUSION: (1) Compared with adherent cells, the expressions of stemness related proteins Nestin, CD133, ABCG2, Nanog, OCT4, and SOX2 were significantly increased. (2) Compared with the control group, THZ1 decreased the proliferation and migration of U87 cells. (3) THZ1 inhibited the mammosphere forming rate and mammosphere size of U87 stem cells. (4) After THZ1 treatment, the expression of N-cadherin and Snail decreased, while the protein expression of E-cadherin and Occludin increased. (5) THZ1 treatment decreased the expression of Wnt/β-catenin pathway related proteins Axin1, β-Catenin, Wnt-5A, GSK3β, Cyclind-1, and C-myc in U87 stem cells. It is concluded that THZ1 can suppress the proliferation and migration of U87 cells, and inhibit the mammosphere forming ability, stemness related protein expression, and epithelial-mesenchymal transformation ability of U87 stem cells by down-regulating the expression of Wnt/β-catenin signaling pathway related molecules.

Key words: THZ1, glioma, cancer stem cell, mammosphere culture, stemness marker, Wnt/β-catenin signaling pathway, epithelial-mesenchymal transformation, proliferation, migration

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