摘要
目的结合代谢组学技术和胚胎干细胞心肌定向诱导分化方法,对多柔比星和二甲双胍造成代谢组分的变化进行研究。方法以小鼠胚胎干细胞体外心肌定向诱导分化为模型,分化培养液中添加不同剂量的多柔比星(3.40、0.17μmol·L~(-1))以及二甲双胍(905.7μmol·L~(-1))。通过对诱导形成拟胚体的一般观察,统计自主节律跳动、拟胚体的数量、频率等;免疫细胞化学法检测心肌特异性蛋白—心肌肌钙蛋白T(cTnT)的表达;应用代谢组学技术初步筛选差异代谢图谱,以多柔比星和二甲双胍共同影响的代谢组分为目标,尝试寻找心脏毒性敏感标志物。结果一般观察和免疫细胞化学结果显示,多柔比星高浓度明显抑制向心肌细胞分化,cTnT表达明显增加,低浓度组拟胚体自主节律明显增快,cTnT表达变化不明显;二甲双胍未见明显变化。代谢组学结果显示,多柔比星和二甲双胍可致细胞内同型半胱氨酸(Hcy)、铁卟啉(FeTMPyP)、叶酸、半胱氨酸(Cys)、cAMP等组分明显降低。结论氧化应激在心脏分化发育过程中起重要作用,Hcy、FeTMPyP、Cys等具有成为心脏毒性敏感标志物的潜力。
Aim To analyze the changes of the metabolic profiling of cardiomyocyte-like cells via introducing metabonomics and stem cell differentiation tech-nology. Methods The mouse embryonic stem cells
引文
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