人α-防御素对人内皮细胞ECV304氧化低密度脂蛋白能力的影响及其机制的实验研究  被引量:1

Impact and potential mechanism of human ot-defensin 1 on low-density lipoprotein oxidation ability of ECV304 cells

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作  者:许程洁[1] 王京伟[1] 宋健[1] 武军驻[1] 宋婷婷[1] 

机构地区:[1]武汉大学基础医学院生物化学与分子生物学系,430071

出  处:《中华心血管病杂志》2013年第5期406-410,共5页Chinese Journal of Cardiology

基  金:国家自然科学基金资助项目(81170273)

摘  要:目的探讨人仅-防御素(human α-defensin,HNP)-1对人内皮细胞氧化低密度脂蛋白(10wdensitylipoprotein,LDL)的影响及其可能机制。方法实验设HNP-1转染组(HNP-1转染的内皮细胞ECV304),siRNA十扰组(siRNA干扰抑制HNP—l表达的ECV304)和HNP-1刺激组(10μg/mlHNP-1刺激的ECV304),并分别设有正常ECV304作为对照组,均经LDL处理3h后检测脂质氧化产物丙二醛(MDA)、蛋白氧化产物PCO(proteincarbonyl,PCO)的生成量。分别采用流式细胞仪、荧光显微镜检测经LDL、脂多糖(LPS)、HNP-1预处理的ECV304(分别为LDL组、LPS组、HNP-1刺激组)和过表达HNP-1的ECV304(HNP-1转染组)中氧自南基的生成量,另设正常ECV304作为对照组。结果(1)MDA和PCO生成量检测结果:HNP-1刺激组、HNP-1转染组MDA生成量均明显高于其相应的对照组1分别为(14.494-1.10)比(9.474-1.18)nmol/mg蛋白和(4.214-0.03)比(3.154-0.02)nmol/mg蛋白,P均〈0.05]。siRNA干扰组MDA生成量则明显低于其对照组f(3.76±0.48)比(4.544-0.28)nmol/mg蛋白,P〈0.05]。HNP—l转染组PCO生成量明显高于对照组和siRNA干扰组(P均〈0.05),且siRNA干扰组较对照组低,但差异无统计学意义。(2)氧自由基水平检测结果:HNP-1刺激组和HNP-1转染组ECV304内氧自由基水平均较LDL组、LPS组及对照组高(P均〈0.05)。结论HNP-1可增强人内皮细胞ECV304氧化LDL的能力,机制可能与提高氧自由基的表达水平有关..Objective To explore the role and potential mechanism of human a-defensin 1 (HNP-1) on low-density lipoprotein (LDL) oxidation ability of human endothenial cells (EVC304). Methods Post incubation with LDL for 3 h, the malondiadehyde (MDA) and protein carbonyl (PCO) were detected in untreated ECV304 (control) and in HNP-1 transfected ECV304 in the presence and absence of siRNA against HNP-I. Flow cytometry and fluorescence microscopy were used to detect the generation of oxygen free radieal in the ECV304 which have been pretreated by LDL, LPS and HNP-1, respectively. Result Compared with control group, MDA level was significantly increased in HNP-1 transfeeted[ (4.21 - 0.03 ) vs. (3. 15 _+ 0. 02) nmol/mg ~ pro~ or ira HNP-lstimulated ECV304 cells I (14.49 + 1. l0 ) vs. (9. 47 + 1. 18 ) mnol/mg ~ pro ], which could be significantly downregulated by siRNA [ ( 3.76 + 0. 48 ) vs. ( 4. 54 + 0. 28 ) nmol/mg ~ pro, all P 〈 0. 05 1 ~ PCO was also significantly increased in HNP-1 transfected ECV304 cells. The levels of free radical were significantly increased in HNP-1 transfeeted or HNP-I stimulated ECV304 cells. Conclusion HNP-1 can enhance the LDL oxidation ability of human endothelial cells via promoting the generation of free radicals.

关 键 词:动脉粥样硬化 内皮细胞 仪防御素 活性氧 脂蛋白类 LDL 

分 类 号:R[医药卫生]

 

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