植物血凝素样氧化型低密度脂蛋白受体介导氧化型低密度脂蛋白对内皮祖细胞存活和功能的影响

被引:5
作者
马凤霞
任倩
韩忠朝
机构
[1] 中国医学科学院北京协和医学院血液学研究所血液病医院实验血液学国家重点实验室
关键词
氧化型低密度脂蛋白; 内皮祖细胞; 植物血凝素样氧化型低密度脂蛋白受体;
D O I
暂无
中图分类号
R543.5 [动脉疾病];
学科分类号
摘要
目的研究植物血凝素样氧化型低密度脂蛋白受体(LOX-1)是否介导氧化型低密度脂蛋白(oxLDL)对内皮祖细胞(EPC)的存活及功能产生影响。方法分选脐血CD34+细胞,培养于内皮细胞生长培养基(EGM-2)中。培养14d后,部分EPC与10、25、50μg/ml的oxLDL孵育48h;部分EPC先与LOX-1单克隆抗体(LOX-1 mAb)预处理24h,再与50μg/ml oxLDL孵育48h;对照组不作处理。检测EPC存活率及EPC迁移、黏附和管状结构形成能力,并检测LOX-1的蛋白及mRNA表达。结果oxLDL浓度为25和50μg/ml时,凋亡率分别为(15.8±1.0)%和(18.8±2.0)%,显著高于对照组的(9.0±1.2)%(P<0.05);迁移率分别为(5.7±1.0)%和(5.1±0.8)%,显著低于对照组的(9.5±0.8)%,(P<0.05);黏附细胞数分别为(33±2)和(30±3)个,显著少于对照组的(37±5)个(P<0.05);形成的管状结构分别为(2.9±0.5)和(1.8±0.5)mm,显著短于对照组的(5.0±0.6)mm(P<0.05)。OxLDL可增加LOX-1 mRNA及蛋白的表达,oxLDL浓度为50μg/ml时,LOX-1 mRNA表达由100%增加为(174±39)%,蛋白表达由100%增加为(172±8)%。OxLDL的上述作用能被LOX-1mAb所阻断。结论OxLDL可降低EPC存活,抑制EPC功能,其作用是由LOX-1介导的。
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页码:336 / 341+459 +459
页数:7
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共 14 条
  • [1] Oversulfated fucoidan inhibits the basic fibroblast growth factor-induced tube for-mation by human umbilical vein endothelial cells:its possi-ble mechanism of action. Soeda S,Kozako T,Iwata K,et al. Biochimica et Biophysica Acta . 2000
  • [2] Effects of ox-LDLon num-ber and activity of circulating endothelial progenitor cells. Wang X,Chen J,Tao Q,et al. Drug and Chemical Toxicology . 2004
  • [3] Isolation of puta-tive progenitor endothelial cells for angiogenesis. Asahara T,Murohara T,Sullivan A,et al. Science . 1997
  • [4] Upregulation of endothelial receptorforoxi-dized LDL(LOX-1)by oxidized LDL and implications in apoptosis of human coronary artery endothelial cells:evi-dence from use of antisense LOX-1mRNA and chemical in-hibitors. Li D,Mehta JL. Arteriosclerosis and Thrombosis . 2000
  • [5] Short-termexvivoexpansion sustains the homing-related properties of umbilical cord blood hematopoietic stem and progenitor cells. Zhai QL,Qiu LG,Li Q,et al. Haematologica . 2004
  • [6] Anovel endotheli-al receptorforoxidized lowdensity lipoprotein. Sawamura T,Kume N,Aoyama T,et al. Nature . 1997
  • [7] Number and mi-gratory activity of circulating endothelial progenitor cells in-versely correlate with risk factors for coronary artery disease. Vasa M,Fichtlscherer S,Aicher A,et al. Circulation Research . 2001
  • [8] Aging,progenitor cell exhaustion,and atherosclerosis. Rauscher FM,Goldschmidt-Clermont PJ,Davis BH,et al. Circulation . 2003
  • [9] Protective effects of lovastatin on vascular endothelium injured by low density lipoprotein. Ma FX,Liu LY,Xiong XM. Acta Pharmacological Sinica . 2003
  • [10] Bone marrow origin of endothelial progenitor cells responsible for postnatal vasculogenesis in physiological and pathological neovascular-ization. Asahara T,Masuda H,Takahashi T,et al. Circulation Research . 1999