晚期糖基化终产物通过氧化应激引起人骨髓间充质干细胞凋亡
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Advanced Glycation End Products Promotes Apoptosis of Human Mesenchymal Stem Cells Through Oxidative Stress
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    摘要:

    目的观察不同剂量晚期糖基化牛血清白蛋白(AGE-BSA)对体外分离培养的人骨髓间充质干细胞增殖、凋亡及氧化应激的影响,为临床上提高干细胞移植治疗糖尿病心肌病后供体干细胞的存活率提供新的依据。方法采用全骨髓法从人的骨髓标本中分离培养骨髓间充质干细胞,以含10%FCS的L-DMEM培养细胞,0.25%的胰酶消化后按1∶2比例传代接种培养,对第3代细胞应用流式细胞仪检测细胞表面标志CD44、CD105和CD34。在骨髓间充质干细胞中加入不同浓度的AGE-BSA,作用24 h后加入CCK-8溶液,37℃5%CO2培养箱培养1 h,用酶标仪在450 nm处测定吸光度值。采用Annexin V/PI双染法进行染色,避光作用20 min后,将细胞置于流式细胞仪上检测细胞凋亡率。同时对细胞内活性氧水平进行测定,并且测定细胞内的丙二醛含量和超氧化物歧化酶活性。结果传代后的骨髓间充质干细胞呈鱼群样或漩涡状排列,细胞为长梭形,贴壁紧密,形态较为一致。细胞表面标志CD105(间充质干细胞相对特异性标志)及CD44(黏附分子,基质细胞表达)呈阳性表达,阳性率分别为98.9%、97.8%;CD34(造血干细胞/祖细胞及内皮细胞阳性)呈阴性表达,表达百分率为0.8%。与对照组相比,20、50、100和200 mg/L AGE-BSA均不同程度地抑制骨髓间充质干细胞的增殖,促进其凋亡,随着作用浓度的增加,细胞内活性氧含量、丙二醛含量明显增加,而细胞匀浆中超氧化物歧化酶的活性却受到了抑制,具有剂量依赖效应。结论晚期糖基化终产物通过促进骨髓间充质干细胞内活性氧生成、减少抗氧化酶生成,增强氧化应激,破坏细胞内环境稳定性,从而抑制骨髓间充质干细胞增殖,促进细胞凋亡。

    Abstract:

    Aim To investigate the effects of advanced glycation end products(AGE-BSA) on oxidative stress and apoptosis in human bone marrow derived Mesenchymal stem cells(hMSC),providing new evidences for a higher survival of donor MSC in the heart of diabetes cardiomyopathy after clinical stem cell transplantation.Methods The adult hMSC were isolated from adult bone marrow and cultured in L-DMEM with 10%FCS,were suspended by trypsin and passaged for subsequent passages.At the third passage,hMSC were identified as the immunophenotype of cell surface CD44,CD105,CD34 on flow cytometry.Then,hMSC were cultured in the absence or presence of AGE-BSA for 24 hours.CCK8 were used to evaluate the proliferation capability,reactivated oxygen species(ROS) were analyzed using the ROS assay kit,the content of malondialdehyde(MDA),the activity of superoxide dismutase(SOD) were measured;the cell apotosis was detected by Annexin V/PI flow cytometry.Results The hMSC exhibited adherent long spindle-shaped cells.The immunophenotype of hMSC showed that both stromal cell-associated markers(CD44) and the stem cell-associated marker(CD105) were positive,which were 97.8% and 98.9%,while blood cell,endothelial cell-associated marker(CD34) was negative,which was only 0.8%.Compared with the control group,co-culturing with 20,50,100,200 mg/L AGE-BSA increased ROS production,the content of MDA in cells and the rate of apoptosis.Simultaneously,AGEBSA decreased antioxidase and proliferation of the cells.Both of them were in a dose dependent manner.Conclusion AGE increases the production of ROS in hMSC,while weakens the production of antioxidases,it increases the oxidative stress,breaks the homeostasis of cells,accordingly,AGE inhibits the proliferation of hMSC and increases the apoptosis of these cells.

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刘钊, 边云飞, 肖传实.晚期糖基化终产物通过氧化应激引起人骨髓间充质干细胞凋亡[J].中国动脉硬化杂志,2011,19(5):399~404.

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  • 收稿日期:2011-01-24
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