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作 者:刘城[1] 吴平生[1] 王月刚[1] 裴静娴[1] 赖艳娴[1]
机构地区:[1]广州医科大学广州市第一人民医院心血管内科,510180
出 处:《中华生物医学工程杂志》2013年第4期261-265,共5页Chinese Journal of Biomedical Engineering
基 金:国家自然科学基金(81100235);广东省自然科学基金(S2011040004458);广州市科技计划重点项目:2012J4100035)
摘 要:目的研究野生型低氧诱导因子1a(HIF.1et)对人微血管内皮细胞(HMVEC.L)增殖、迁移、成管的影响,并初步探讨其作用机制。方法实验分正常对照组、物理低氧组及野生型HIF.1a基因组,分别用MTS法、划痕法、成管法检测前述3组HMVEC.L增殖、迁移、成管的能力,并用Westem印迹测定HIF-1a及血管内皮生长因子(VEGF)蛋白表达水平。结果MTS法结果显示,野生型HIF—1a基因转染HMVEC—L后明显促进HMVEC—L增殖,与正常对照组、物理低氧组差异有统计学意义(P〈0.05)。划痕结果显示,正常对照组、物理低氧组、野生型HIF—1a基因组HMVEC.L迁移率分别为(1.09±0.25)%、(8.65±1.03)%及(17.12±1.97)%,其中野生型HIF.1a基因组迁移率最大(P〈0.05)。成管法结果显示,正常对照组、物理低氧组、野生型HIF-1a基因组成管长度分别为(0.34±0.07)、(0.90±0.16)、(1.76±0.09)mm/视野,其中野生型HIF—1a基因组成管长度最长(P〈0.05)。Western印迹结果显示,与正常对照组相比,物理低氧组、野生型HIF.1et基因组HIF.1a、VEGF蛋白表达均明显升高(P〈0.05),其中野生型HIF—1a基因组HIF—1a、VEGF蛋白表达水平最高(均为P〈O.05)。结论野生型HIF.1a基因能在体外促进HMVEC-L增殖、迁移、管样形成,是一种具有临床应用前景的血管新生基因。Objective To study the effects of wild-type hypoxia-inducible factor-la (HIF-la) on proliferation, migration and tube formation in vitro in human lung microvascular endothelial cells (HMVEC-Ls). Methods The HMVEC-Ls were divided into normal control group, physical hypoxia group and HIF-la transfection group. The MTS, wound-healing migration, and Matrigel assays were employed to determine the proliferation, migration and tube formation, respectively. The protein expressions of HIF-let and VEGF were analyzed by Western blotting. Results Compared with normal control and physical hypoxia groups, transfection of HMVEC-L with wild-type HIF-let at day 3 resulted in pronounced HMVEC-L proliferation (P〈0.05), a significantly augmented migration rate of the genome [ (1.09±0.25)% and (8.65±1.03)% vs (17.12±1.97)%, P〈0.05 ] and substantially increased length of tube [ (0.34±0.07) and (0.90±0.16) vs (1.76±0.09) mm/field, P〈0.05 ]. Western blotting assay evidenced significantly augmented HIF-let and VEGF expressions in physical hypoxia and wild-type HIF-lct groups (all P〈0.05), particularly the latter. Conclusion Wild-type HIF-la promotes angiogenesis by facilitating HMVEC-L proliferation, migration and tube formation in vitro and is expected to be a promising target for therapeutic angiogenesis.
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