不同转移能力乳腺癌细胞株的差异表达蛋白研究

背景与目的:肿瘤转移相关蛋白在肿瘤细胞转移过程中具有重要作用,本研究在建立高转移潜能乳腺癌细胞株LM-MCF-7的基础上,筛选乳腺癌细胞转移相关蛋白并探讨其功能。方法:应用蛋白质组学和免疫印迹等方法比较和筛选来源相同但具有不同转移能力的乳腺癌细胞株(MCF-7/LM-MCF-7)的蛋白质表达差异。将克隆有存活蛋白(survivin)的真核表达载体pcDNA3-Sur转染至MCF-7细胞,通过“伤口愈合”实验检测存活蛋白对乳腺癌细胞迁移的影响。结果:应用蛋白质组学技术获得8个有意义的蛋白质,分别有参与细胞骨架构成、物质代谢、细胞凋亡、蛋白折叠和蛋白质相互作用等功能。应用免疫印迹方法发现,在MCF-7细胞中nm23、p27表达水平较高,在LM-MCF-7中存活蛋白、肌球蛋白轻链激酶(myosinlightchainkinase,MLCK)和Bcl-2表达水平较高。“伤口愈合”实验显示,存活蛋白过表达可明显增强MCF-7细胞的迁移能力。结论:不同转移能力的乳腺癌细胞株中存在与乳腺癌转移相关的蛋白质,存活蛋白与乳腺癌转移有密切的关系。

Investigation of discrepant proteins between two breast cancer cell lines with different metastatic abilities

BACKGROUND & OBJECTIVE: Metastasis associated proteins play important roles in metastasis. This study was to investigate proteins which may be involved in breast cancer cell metastasis and further explore the potential mechanisms. METHODS: LM-MCF-7 and MCF-7, two breast cancer cell lines with different metastatic potentials, derived from the same parent cell line, were used in our study. Proteomics and Western blot were applied to identify differentially expressed proteins. Wound healing assay was performed to observe the effect of survivin gene on breast cancer cell migration by transfecting pcDNA3-Sur plasmid into MCF-7 cells. RESULTS: Eight differently expressed proteins, which were correlated with cell structures, cellular metabolism, apoptosis, protein enfold or interaction, were identified. Protein expression of nm23 and p27 was relatively higher in MCF-7 cells; while the expression of survivin, Bcl-2 and myosin light chain kinase was relatively higher in LM-MCF-7 cells. Increased migration ability was observed in MCF-7 cells which were transfected with pcDNA3-Sur. CONCLUSION: Metastasis associated proteins exist in breast cancer cell lines with different metastatic abilities. Survivin is closely related to the metastasis in breast cancer cells.