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保护血管内皮对维护心血管系统健康有着重要意义[1]。近年的研究证实,血管内皮完整性的维持不仅依赖于现有的内皮细胞,而且与骨髓来源的具有向成熟内皮细胞分化能力的未成熟细胞—内皮祖细胞(endothelial progenitor cell, EPC)的募集有关[2-3]。临床研究证实,外周血中循环EPC的数量与冠心病常见的危险因素(如高血压、糖尿病等)呈负相关关系,EPC可作为治疗缺血、肺动脉高压等血管疾病状态的新靶点[2-3]。本课题组和他人的研究均证实[2, 4-5],高血压动物和患者的EPC均出现显著的功能受损。因此,如果能够通过药物干预手段逆转其受损的EPC功能,无疑对减轻高血压患者与内皮功能相关的靶器官损伤,以及改善高血压EPC移植治疗效果等具有重要意义。
去氧皮质酮/盐(Deoxycorticosterone acetate-salt, DOCA-salt)高血压模型是一种盐敏感性高血压动物模型,盐敏感性高血压在美国高血压患者中占1/3的比例,是一种重要的高血压类型[4-6]。课题组既往的研究证实,DOCA-salt高血压小鼠EPC功能受损与其内皮型一氧化氮合酶(endothelial nitric oxide synthase, eNOS)的脱偶联(uncoupling)有关[5]。在研究中我们也找到了一些对eNOS脱偶联相关的信号通路/分子有一定改善作用的药物,如四氢生物蝶呤(tetrahydrobiopterin, BH4),超氧化物歧化酶-聚乙二醇(superoxide dismutase-polyethylene glycol, PEG-SOD),N(G)-硝基-L-精氨酸(N(G)-nitro-L-arginine, L-NNA)等[5-6]。但目前尚不知道这些药物是否可有效逆转DOCA-salt小鼠受损的EPC功能。本研究拟在以往研究的基础上,寻找改善盐敏感性高血压小鼠EPC功能失常的有效药物干预手段,为进一步的EPC移植治疗研究奠定基础。
Improvement of impaired endothelial progenitor cell functions by in vitro drug interference in DOCA-salt hypertensive mice
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摘要:
目的 探索改善去氧皮质酮/盐(DOCA-salt)高血压小鼠内皮祖细胞(EPC)功能的药物干预手段。 方法 健康的成年C57BL/6小鼠,随机分为模型组和假手术对照组,模型组制备DOCA-salt高血压小鼠模型,用尾动脉测压法测定小鼠血压,提取其EPC并分别用流式细胞仪和荧光显微镜进行鉴定,模型组小鼠EPC分别用四氢生物蝶呤(BH4)、超氧化物歧化酶-聚乙二醇(PEG-SOD)、N(G)-硝基-L-精氨酸(L-NNA)孵育24 h,检测其功能。 结果 与对照组比较,DOCA-salt高血压小鼠的收缩压明显升高(P<0.01),其EPC的黏附功能和小管形成功能明显受损(P<0.01),而经BH4、PEG-SOD、L-NNA孵育24 h后,EPC的黏附功能(P<0.01)和小管形成功能(P<0.05)均显著改善。 结论 BH4、PEG-SOD、L-NNA可有效改善DOCA-salt高血压小鼠EPC受损的功能。 -
关键词:
- 内皮祖细胞 /
- 高血压 /
- 四氢生物蝶呤 /
- 超氧化物歧化酶 /
- N(G)-硝基-L-精氨酸
Abstract:Objective To investigate the effect of tetrahydrobiopterin (BH4), superoxide dismutase-polyethylene glycol (PEG-SOD) and N(G)-nitro-L-arginine (L-NNA) on impaired endothelial progenitor cell (EPC) functions in DOCA-salt hypertensive mice. Methods DOCA-salt hypertension was created and systolic blood pressure was measured by tail-cuff methods. EPC was isolated from bone marrow of mice and characterized by flow cytometry and fluorescence microscopy. EPC of DOCA-salt mice was incubated with BH4, PEG-SOD, and L-NNA for 24 h, then in vitro EPC function assays were performed. Results Compared with control group, systolic blood pressure was significantly increased in DOCA-salt mice. Both EPC adhesion and angiogenesis functions were impaired in DOCA-salt mice compared to control animals, which were reversed by incubation with BH4, PEG-SOD and L-NNA. Conclusion BH4, PEG-SOD and L-NNA rescued the impairments from EPC functions in DOCA-salt hypertensive mice. -
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