中国组织工程研究 ›› 2019, Vol. 23 ›› Issue (3): 329-334.doi: 10.3969/j.issn.2095-4344.0600

• 骨组织构建 bone tissue construction •    下一篇

XCT-790导致成骨细胞活性下降和骨形成不足的机制

刘少津1,万  雷2,乔荣勤2,黄宏兴2,王吉利1,李钊政1   

  1.  (1广州中医药大学,广东省广州市  510405;2广州中医药大学第三附属医院,广东省广州市   510240)
  • 收稿日期:2018-08-17 出版日期:2019-01-28 发布日期:2019-01-28
  • 通讯作者: 万雷,博士,副主任中医师,广州中医药大学第三附属医院,广东省广州市 510240
  • 作者简介:刘少津,男,1990年生,江西省乐安县人,汉族,广州中医药大学在读硕士,主要从事中医骨伤科学的研究。
  • 基金资助:

    国家自然科学基金项目(81302991,81673786) 项目负责人:万雷;广东省自然科学基金项目(2014A030310127);广东省科技计划项目(2016A020216024);2014广东省“优青计划”项目(yq2014041),项目负责人:万雷

Mechanism of XCT-790 reducing activity and osteogenesis of osteoblasts

Liu Shaojin1, Wan Lei2, Qiao Rongqin2, Huang Hongxing2, Wang Jili1, Li Zhaozheng1   

  1. (1Guangzhou University of Chinese Medicine, Guangzhou 510405, Guangdong Province, China; 2the Third Affiliated Hospital of Guangzhou University of Chinese Medicine, Guangzhou 510240, Guangdong Province, China)
  • Received:2018-08-17 Online:2019-01-28 Published:2019-01-28
  • Contact: Wan Lei, MD, Associate chief physician, the Affiliated Third Hospital of Guangzhou University of Chinese Medicine, Guangzhou 510240, Guangdong Province, China
  • About author:Liu Shaojin, Master candidate, Guangzhou University of Chinese Medicine, Guangzhou 510405, Guangdong Province, China
  • Supported by:

    the National Natural Science Foundation of China, No. 81302991 and 81673786 (to WL); the Natural Science Foundation of Guangdong Province, No. 2014A030310127; the Science and Technology Program of Guangdong Province, No. 2016A020216024; the “Excellent Youth Plan” Project of Guangdong Province in 2014, No. yq2014041 (to WL)

摘要:

文章快速阅读:

文题释义:
DKK1(Dickkopf-1):是一种Wnt信号通路的可溶性胞外抑制剂,可以通过竞争性地结合Wnt蛋白的共同受体低密度脂蛋白受体相关蛋白5/6来阻断经典Wnt/β-catenin途径,进而调控Wnt/β-catenin途径下游靶基因的转录。DKK1可阻断Wnt/β-catenin信号通路、抑制骨形成,同时又通过与骨保护素/核因子κB受体活化因子配体/前体细胞表面受体轴的串话作用促进破骨细胞的分化与成熟。
Sost:是骨形成中的抑制蛋白,也是一种调控骨分化的拮抗因子,在成熟的骨骼细胞中有特异性表达、可调控成骨细胞的分化和增殖。
XCT-790:是雌激素相关受体α(ERRα)的特异性抑制剂,可调节雌激素信号通路对成骨细胞的功能活动。
ERRα:具有调节转录基因的功能,是一个参与多种细胞生理过程的孤儿核受体。基于对雌激素受体在成骨细胞和软骨细胞分化的作用,ERRα已成为骨质疏松症和其他骨疾病的一个新的治疗目标。
摘要
背景:
Wnt信号通路在骨细胞的形成、分化和成熟过程中起着重要作用,DKK1、Sost在调节骨量和成骨细胞分化中起负调节作用,是Wnt信号通路的负调节因子。XCT-790是雌激素相关受体α的特异性抑制剂,可调节雌激素信号通路对成骨细胞的功能活动。
目的:观察XCT-790对Wnt信号通路抑制因子DKK1、Sost过表达腺病毒载体转染的人成骨肉瘤细胞MG63细胞及其骨形成相关蛋白LRP5、骨形态发生蛋白2、骨桥蛋白、骨保护蛋白、结缔组织生长因子的作用。
方法:将MG63细胞分成8组:空白对照组、过表达DKK1组、过表达Sost组、过表达DKK1+Sost组、XCT-790干预空载腺病毒组、XCT-790干预过表达DKK1组、XCT-790干预过表达Sost组、XCT-790干预过表达DKK1+Sost组,根据组别不同分别用上述重组腺病毒转染MG63细胞。应用MTT法检测MG63细胞的活性,碱性磷酸酶试剂盒检测碱性磷酸酶活性,流式分析钙离子浓度;Western blot检测低密度脂蛋白相关蛋白5、骨形态发生蛋白2、骨桥蛋白、骨保护蛋白、结缔组织生长因子的表达。
结果与结论:①与空白对照组对比,过表达DKK1、Sost、DKK1+Sost组及XCT-790 干预空载腺病毒组均可降低细胞活性、碱性磷酸酶活性,提高钙离子浓度;降低低密度脂蛋白相关蛋白5、骨形态发生蛋白2、骨桥蛋白、骨保护蛋白、结缔组织生长因子的表达量,组间比较差异均有显著性意义(P < 0.05);②而当XCT-790干预过表达 DKK1、Sost、DKK1 +Sost组的MG63细胞时,可进一步降低细胞活性、碱性磷酸酶活性,提高钙离子浓度;降低低密度脂蛋白相关蛋白5、骨形态发生蛋白2、骨桥蛋白、骨保护蛋白、结缔组织生长因子的表达量,组间比较差异均有显著性意义(P < 0.05);③结果说明,XCT-790直接调节Wnt信号通路的传导,同时也可协同DKK1、Sost共同抑制Wnt信号通路的开放,从而降低成骨细胞活性和骨形成相关蛋白LRP5、骨形态发生蛋白2、骨保护蛋白等的表达量,导致成骨细胞分化、增殖能力减弱和骨形成不足。

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
ORCID: 0000-0002-0921-9573(刘少津)

关键词: XCT-790, DKK1, Sost, MG63细胞, 雌激素相关受体α, 组织构建

Abstract:

BACKGROUND: Wnt signaling pathway plays an important role in formation, differentiation and mature of osteocytes. As negative regulators of Wnt signaling pathway, DKK1 and Sost play negative roles in regulating bone mass and osteoblast differentiation. XCT-790, an inhibitor of estrogen receptor-related receptor α, can regulate the effect of estrogen signaling pathway on osteoclast function.
OBJECTIVE: To observe the effects of XCT-790 on the proliferation of MG63 cells transfected with DKK 1 and Sost overexpression adenovirus vector and the expression of low-density lipoprotein receptor-related protein (LRP) 5, bone morphologic protein 2, osteopontin, osteoprotegerin, and connective tissue growth factor (CTGF) protein.
METHODS: MG63 cells were divided into eight groups: blank control, overexpressed DKK1 (ad-DKK1), overexpressed Sost (ad-Sost), overexpressed DKK1+Sost (ad-DKK1+Sost), XCT-790-intervened blank adenovirus, XCT-790-intervened ad-Sost, XCT-790-intervened ad-DKK1-Sost groups. The cell viability was detected by MTT assay. The alkaline phosphatase activity was detected by alkaline phosphatase kit. Ca2+ concentration was detected by flow cytometer. Expression of LRP5, bone morphologic protein 2, osteopontin, osteoprotegerin and CTGF was detected by western blot assay.
RESULTS AND CONCLUSION: Compared with the blank control group, ad-DKK1, ad-Sost, ad-DKK1+Sost and XCT-790-intervened blank adenovirus groups could significantly decrease the cell activity, alkaline phosphatase activity, increase calcium concentration and down-regulate the expression of LRP5, bone morphologic protein 2, osteopontin, osteoprotegerin and CTGF (P < 0.05). In the XCT-790-intervented ad-DKK1, ad-Sost, ad-DKK1+Sost groups, the cell activity, alkaline phosphatase activity, and the expression of LRP5, bone morphologic protein 2, osteopontin, osteoprotegerin and CTGF were significantly reduced, and the Ca2+ concentration was significantly increased (P < 0.05). In summary, XCT-790 can directly regulate Wnt signaling pathway, and can cooperate with DKK1 and Sost to inhibit Wnt signaling pathway, thereby decreasing the activity of osteoblasts, LRP5, bone morphologic protein 2, osteopontin, osteoprotegerin, and CTGF protein expression, and further decreasing differentiation, proliferation and osteogenesis of osteoblasts.

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

Key words: Estrogen Receptor alpha, Adenoviridae, Transfection, Tissue Engineering

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