抑制趋化因子受体7表达对体外低氧状态下人尿源性干细胞的生物学影响  

Effect of inhibition of chemokine C⁃X⁃C⁃motif receptor 7 expression on biological properties of human urine⁃derived stem cells in hypoxia state in vitro

作　　者：佟吉爽 胡超群 毕杨[2] TONG Ji-shuang;HU Chao-qun;BI Yang(Experimental Medicine Center,the First Affiliated Hospital of Chongqing Medical College,Chongqing 400014,China;Stem Cell Laboratory,Pediatric Research Institute,Children’s Hospital of Chongqing Medical University,Ministry of Education Key Laboratory of Child Development and Disorders,National Clinical Research Center for Child Health and Disorders,Chongqing Key Laboratory of Pediatrics,Chongqing 400014,China)

机构地区：[1]重庆医药高等专科学校附属第一医院实验医学中心,重庆400014 [2]重庆医科大学附属儿童医院儿研所干细胞研究室,儿童发育疾病研究教育部重点实验室,国家儿童健康与疾病临床医学研究中心,儿科学重庆市重点实验室,重庆400014

出　　处：《解剖学报》2024年第6期699-707,共9页Acta Anatomica Sinica

基　　金：重庆市自然科学基金(CSTB2024NSCQ-MSX0486)。

摘　　要：目的探讨抑制趋化因子受体7(CXCR7)的表达对低氧状态下人尿源性干细胞(USCs)增殖、迁移、分化和线粒体功能的影响。方法低氧组3%O2处理48 h,采用CXCR7 siRNA(siCXCR7)抑制CXCR7的表达,Real-time PCR和Western blotting检测CXCR7的表达;集落形成实验和细胞生长曲线检测细胞增殖能力;划痕实验及Transwell实验检测细胞迁移能力;碱性磷酸酶、茜素红、油红O、阿利新蓝染色检测细胞多向分化能力;JC-1荧光探针、三磷酸腺苷(ATP)及活性氧(ROS)水平检测评估线粒体功能。结果低氧组USCs中CXCR7的表达显著上调,USCs的增殖、迁移和集落形成能力增强,抑制CXCR7表达可抑制低氧对USCs的增殖、迁移和集落形成的作用,对细胞分化没有影响。低氧处理提高了线粒体膜电位和ATP水平,降低了活性氧的产生,而抑制CXCR7可降低线粒体膜电位和ATP的产生。结论低氧可能通过CXCR7信号通路增强USCs的线粒体功能,从而促进细胞的增殖和迁移能力。Objective To investigate the effects of inhibition of chemokine C⁃X⁃C motif receptor 7(CXCR7)expression on the proliferation,migration,differentiation and mitochondrial function of human urine⁃derived stem cells(USCs)under hypoxia.Methods CXCR7 expression was inhibited by siCXCR7 and detected by Real⁃time PCR and Western blotting in hypoxia group treated with 3%O2 for 48 hours.Cell proliferation was detected by clonal formation assay and cell growth curve.Cell migration ability was detected by scratch assay and Transwell assay.Alkaline phosphatase,alizarin red,oil red O and alcian blue staining were used to detect the multidirectional differentiation ability of cells.Mitochondrial function was evaluated by JC⁃1 fluorescent probe,adenosine triphosphate(ATP)and reactive oxygen species(ROS).Results Compared with the normal oxygen group,the expression of CXCR7 in USCs in hypoxia group was significantly up⁃regulated,and hypoxia promoted the proliferation,migration and clonogenesis of USCs.SiCXCR7 inhibited the expression of CXCR7 and inhibited the effects of hypoxia on the proliferation,migration and clonogenesis of USCs,but had no effect on cell differentiation.Hypoxia treatment increased mitochondrial membrane potential and ATP levels,and decreased the production of reactive oxygen species,while CXCR7 inhibition decreased mitochondrial membrane potential and ATP production.Conclusion Hypoxia may enhance mitochondrial function of USCs through the CXCR7 signaling pathway,thereby promoting cell proliferation and migration.

关 键 词：趋化因子受体7 低氧 尿源性干细胞 细胞增殖 细胞迁移 实时定量聚合酶链反应 

分 类 号：Q291[生物学—细胞生物学]