瘦素促进人乳腺癌细胞株MCF-7增殖的机制

摘要

Objective To investigate the effects of leptin on proliferation of the breast carcinoma MCF-7 cells in terms of protein and nRNA of Rab-25 and C-myc.Methods MCF-7 cells were treated with leptin and normal saline (NS) as control.The 490 nm OD values of cells were read by MTT and the protein and mRNA expressions of Rab-25 and C-myc were measured by western blot and RT-PCR methods in two groups.Results Compared with control group,leptin can promote the proliferation of MCF-7 cells in a dose and time dependent manner within certain limit and up-regulate the protein expressions of Rab-25 and C-myc in the breast carcinoma MCF-7 cells (P ＜ 0.05).However,leptin also can up-regulate the mRNA expressions of Rab-25 but without significance (P =0.05).On the contrary,leptin can also up-regulate the mRNA expressions of C-myc (P ＜ 0.05).Conclusion Leptin promotes breast cancer cells proliferation,which may be related to up-regulate the protein and mRNA expressions of Rab-25 and C-myc.It could provide theoretical foundation and new target of gene therapy in the clinical treatment of breast cancer.%目的:探讨瘦素是否通过影响Rab-25和C-myc的表达促进人乳腺癌细胞株MCF-7细胞的增殖.方法:体外培养人乳腺癌MCF-7细胞株,在对数生长期将细胞随机分为对照组和瘦素处理组,一定时间后MTF法检测细胞增殖程度以及Rab-25和C-myc的表达水平.结果:与对照组相比,不同浓度瘦素处理MCF-7细胞,一定范围内可呈时间和剂量依赖性的方式促进细胞增殖(P＜0.05).瘦素处理组MCF-7细胞Rab-25和C-myc蛋白表达水平均高于对照组(P＜0.05),差异有统计学意义;Rab-25 mRNA的表达水平瘦素处理组高于对照组(P=0.05),差异无统计学意义;而C-myc mRNA的表达水平瘦素组高于对照组(P＜0.05),差异有统计学意义.结论:瘦素通过上调Rab-25和C-myc特别是后者的表达水平促进乳腺癌MCF-7细胞增殖,为临床乳腺癌的靶向基因治疗提供新的实验依据.