Abstract
背景与目的目前研究认为侧群细胞(side population cell, SP cell)富集了肿瘤干细胞,是肿瘤生长和发展的根源;并且SP细胞对放化疗高度耐受,成为肿瘤复发转移的重要因素。为此,我们探讨了肺癌SP细胞与非SP细胞(non-SP)miRNA分子表达谱差异,旨在为进一步研究miRNA在肺癌干细胞中的作用机制打下基础。方法利用Hoechst 33342染料法,通过流式细胞仪紫外激光分选功能分选出A549细胞中的SP细胞和non-SP细胞,分别采用Trizol一步法提取两者的总RNA,利用miRNA芯片检测系统进行miRNA表达谱差异分析。结果肺癌SP细胞和non-SP细胞miRNA表达谱存在明显差异。与non-SP细胞相比,在SP细胞中上调2倍以上的miRNA有9条,下调2倍以上的miRNA有25条。结论差异表达的miRNA可能参与肺癌干细胞的发生发展过程,为进一步揭示肺癌干细胞发生的分子机制提供了依据。
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