口腔医学研究 ›› 2024, Vol. 40 ›› Issue (9): 785-792.DOI: 10.13701/j.cnki.kqyxyj.2024.09.006

• 口腔颌面外科学研究 • 上一篇    下一篇

SIRT1调控BMSCs成骨分化与H型血管生成促进骨质疏松骨缺损愈合的研究

杨启恒, 刘士博, 刘航航, 刘瑶, 邵京京, 罗恩*   

  1. 口腔疾病防治全国重点实验室 国家口腔疾病临床医学研究中心 四川大学华西口腔医院正颌及关节外科 四川 成都 610041
  • 收稿日期:2024-04-12 出版日期:2024-09-28 发布日期:2024-09-25
  • 通讯作者: *罗恩,E-mail:luoen521125@sina.com
  • 作者简介:杨启恒(2000~),女,河北承德人,硕士在读,研究方向:口腔颌面外科。
  • 基金资助:
    国家自然科学基金面上项目(编号:82370932)四川省中央引导地方科技发展资金(编号:2023ZYD0107)四川省自然科学基金青年项目(编号:24NSFSC3073,2023NSFSC1393)

SIRT1 Regulates Osteogenic Differentiation of BMSCs and H-type Vessels Formation to Promote Healing of Osteoporotic Bone Defects

YANG Qiheng, LIU Shibo, LIU Hanghang, LIU Yao, SHAO Jingjing, LUO En*   

  1. State Key Laboratory of Oral Diseases & National Clinical Research Center for Oral Diseases, Department of Oral and Maxillofacial Surgery, West China Hospital of Stmatology, Sichuan University, Chengdu 610041, China
  • Received:2024-04-12 Online:2024-09-28 Published:2024-09-25

摘要: 目的:探究沉默信息调节因子1(silent information regulator 1,SIRT1)通过调控骨髓间充质干细胞(bone marrow mesenchymal stem cells,BMSCs)成骨分化与H型血管生成对老年骨质疏松状态下骨缺损愈合的作用,并探讨其具体分子机制。方法:利用免疫组织化学染色检测小鼠骨组织中SIRT1表达的增龄性改变。使用SIRT1激活剂SRT1720与抑制剂EX527作用于BMSCs, 实时荧光定量逆转录聚合酶链反应(quantitative real-time PCR,RT-qPCR)与Western blot检测成骨标志物以及促H型血管形成因子的表达变化,免疫荧光染色与Western blot检测上述过程中Wnt/连环蛋白β(β-catenin)信号通路变化。构建老年骨质疏松骨缺损模型,SRT1720与EX527作用的同时,分别给予Wnt信号通路抑制剂XAV939与激活剂CHIR-99021,Micro-CT、苏木精-伊红(hematoxylin-eosin staining,HE)/Masson染色与免疫荧光染色检测各组骨缺损区域新骨形成与H型血管含量差异。结果:小鼠骨组织中SIRT1表达呈现增龄性下调趋势。SIRT1能够促进成骨因子碱性磷酸酶(alkaline phosphatase, ALP)、矮小相关转录因子2(Runt-related transcription factor 2, RUNX2)和促H型血管形成因子slit同源物3(slit homolog 3, SLIT3)、血管内皮生长因子(vascular endothelial growth factor, VEGF)的表达,并促进老年骨质疏松骨缺损区域内H型血管形成与骨再生,且上述作用由Wnt/β-catenin信号通路介导。结论:SIRT1能够通过调控Wnt/β-catenin信号通路促进BMSCs成骨分化与H型血管生成,进而促进老年骨质疏松小鼠的骨缺损愈合。

关键词: 沉默信息调节因子1, Wnt/β-catenin信号通路, H型血管, 老年骨质疏松, 骨缺损

Abstract: Objective: To investigate the role of silent information regulator 1 (SIRT1) on H-type vessels regeneration and bone defect healing in senile osteoporotic state by regulating osteogenic differentiation of bone marrow mesenchymal stem cells (BMSCs) and to explore its specific molecular mechanism. Methods: Immunohistochemical staining was used to detect age-related changes in SIRT1 expression in mouse bone tissue. BMSCs were treated with SIRT1 activator SRT1720 and inhibitor EX527, and the changes in the expression of osteogenic markers and H-type angiogenic factors were detected by RT-qPCR and Western Blot, and the changes in the Wnt/β-catenin signaling pathway in the above process were detected by immunofluorescence staining and Western Blot. A model of osteoporotic bone defects was constructed in the elderly, and SRT1720 and EX527 were administered with XAV939, an inhibitor of Wnt signaling pathway, and CHIR-99021, an activator of Wnt signaling pathway, respectively. The differences in the formation of new bone and H-vessel content of the defects were detected by Micro-CT, HE/Masson staining, and immunofluorescent staining in the respective groups. Results: The expression of SIRT1 showed an age-increasing down-regulation trend in mouse bone tissues. SIRT1 was able to promote the expression of alkaline phosphatase (ALP), Runt-related transcription factor 2 (RUNX2), and the pro-H-type angiogenic factors slit homolog 3 (SLIT3) and vascular endothelial growth factor (VEGF), and able to promote the H-type angiogenesis and bone regeneration in the region of osteoporotic bone defects in old age, which was mediated by the Wnt/β-catenin signaling pathway. Conclusion: SIRT1 can promote the osteogenic differentiation and H-type angiogenesis of BMSCs by regulating the Wnt/β-catenin signaling pathway, which in turn promotes the healing of bone defects in the osteoporotic state of aged mice.

Key words: SIRT1, Wnt/β-catenin signaling pathway, H-type vessels, senile osteoporosis, bone defect