铁过载对脐带血来源的造血干祖细胞及造血支持细胞的作用观察

摘要

目的 探讨铁过载对脐带血(UCB)来源的造血干祖细胞及造血支持细胞,尤其是间充质干细胞(MSCs)的损伤作用.方法 体外培养脐带血单个核细胞(UCB-MNCs)和脐带血间充质干细胞(UCB-MSCs),向培养液中添加200 μmol/L的枸橼酸铁胺(FAC) 24 h建立铁过载模型.分为MNCs-CTL组、MNCs-FAC组、MSCs-CTL组、MSCs-FAC组,每组设3个复孔,实验重复3次.检测细胞内活性氧物质(ROS)水平变化、细胞增殖、分化、凋亡以及造血支持作用.结果 对UCB-MNCs进行铁过载,MNCs-FAC组造血集落形成单位(CFU-E、CFU-GM、BFU-E、CFU-mix)计数显著低于MNCs-CTL组(P＜0.05),MNCs-FAC组造血干细胞(CD+34)、髓系造血细胞(CD+33)、红系造血细胞(GlyA+)比例及计数均显著低于MNCs-CTL组(P均＜0.05)；MNCs-FAC组的凋亡率高于MNCs-CTL组(P＜0.05).MSCs-FAC组的群体倍增时间明显长于MSCs-CTL组,且其凋亡率亦高于MSCs-CTL组(P＜0.05).结论 铁过载可抑制造血干祖细胞的增殖、分化,诱导其凋亡,也可抑制MSCs的增殖能力,诱导其凋亡,降低其造血支持能力,且此过程中ROS升高.%Objective To explore the detrimental effect of iron overload on umbilical-cord blood (UCB) derived hematopoietic stem/progenitor cells (HSPCs) and hematopoietic supportive cells,especially mesenchymal stem cells (MSCs).Methods Iron overload model of UCB-MNCs and UCB-MSCs was successfully established by adding 200? mol/L FAC into the culture medium for 12h.Then the reactive oxygen species (ROS) level,cell proliferation,cell differentiation,apoptosis and hematopoietic supportive capability were detected respectively.Results Iron overload was conducted on the UCB-MNCs.The hematopoietic colony forming units (CFU-E,CFU-GM,BFU-E,CFU-mix) counts in the MNCs-FAC group were significantly lower than those of MNCs-CTL group (P ＜ 0.05) ; CD+34,CD3+33,GlyA + cell ratio and counts in the MNCs-FAC group were significantly lower than those in the MNCs-CTL (all P ＜ 0.05) ; apoptosis rate in the MNCs-FAC group was higher than that of MNCs-CTL group (P ＜ 0.05).The population doubling time in the MSCs-FAC group was significuntly longer than that in the MSCs-CTL group,and the apoptosis rate was also higher than that of MSCs-CTL group (P ＜ 0.05).Conclusions Iron overload could inhibit the proliferation,differentiation of HSPCs and induce apoptosis.Furthermore,it could also inhibit cell proliferation,induce apoptosis of UCB-MSCs and decrease its hematopoietic supportive capability,which was accompanied with the increased ROS.