摘要
目的:探讨小干扰RNA(small interference RNA,siRNA)介导的细胞色素P4501B1(cytochrome P-4501B1,CYP1B1)基因沉默对二十碳五烯酸(eicosapentaenoic acid,EPA)和花生四烯酸(arachidonic acid,AA)作用下乳腺癌MDA-MB-231细胞增殖的影响。方法:应用细胞计数试剂盒(cell counting kit-8,CCK-8)检测经EPA和AA处理后MDA-MB-231细胞的增殖情况。采用RNA干扰(RNA interference,RNAi)技术干扰CYP1B1的表达,随后应用荧光实时定量PCR(real-time-uorescence quantitative PCR,RFQ-PCR)和蛋白免疫印迹法检测转染效率,以及siRNA干扰后EPA和AA作用下MDA-MB-231细胞中CYP1B1和儿茶酚氧位甲基转移酶(catechol-O-methyltransferase,COMT)mRNA和蛋白的表达情况。采用CCK-8法检测siRNA干扰后EPA和AA作用下MDA-MB-231细胞的增殖情况。结果:EPA处理组的MDA-MB-231细胞数明显少于对照组,而AA处理组的MDA-MB-231细胞则明显多于对照组(P<0.05)。转染CYP1B1siRNA的MDA-MB-231细胞中,CYP1B1mRNA和蛋白的表达均有所下降,而COMT mRNA和蛋白的表达水平则有所上升。CYP1B1siRNA转染的MDA-MB-231细胞的增殖能力下降,且EPA处理组的MDA-MB-231细胞数明显多于阴性对照组(P<0.05)。结论:CYP1B1基因沉默能够抑制MDA-MB-231细胞的增殖,逆转EPA对细胞增殖的抑制作用。EPA可能通过调节CYP1B1的表达来抑制乳腺癌细胞的增殖。
Objective: To investigate the effect of CYP1B1 (cytochrome P-450 1B1) gene silencing induced by small interference RNA (siRNA) on the proliferation of MDA-MB-231 cells treated with EPA (eicosapentaenoic acid) and AA (arachidonic acid). Methods: The proliferation of MDA-MB-231 cells treated with EPA or AA was detected by CCK-8 (cell counting kit-8) assay. The expression of CYP1B1 was interfered by RNAi (RNA interference) technique. The transfection efficiency was examined by real- time fluorescence quantitative PCR (RFQ-PCR) and Western blotting, respectively. The expression levels of CYP1B1 and COMT (catechol-O-methyltransferase) mRNAs and proteins in MDA-MB-231 cells interfered with siRNA and treated with EPA or AA were determined by RFQ-PCR and Western blotting, respectively. The viability of breast cancer MDA-MB-231 cells interfered with siRNA and treated with EPA or AA was detected by CCK-8 assay. Results:The cell number of EPA-treated group was lower while the cell number of AA-treated group was higher than that of the control group (P〈0.05). The expression levels of CYP1B1 mRNA and protein were decreased in MDA-MB-231 cells transfected with CYP1B1 siRNA, while the expression levels of COMT mRNA and protein were increased. The proliferation of MDA-MB-231 cells transfected with CYP1B1 siRNAwas inhibited, and the number of MDA-MB-231 cells treated with EPA was significantly higher than that of the negative control group (P〈0.05). Conclusion: CYP1B1 gene silencing inhibits the proliferation of MDA-MB-231 cells and reverses the inhibitory effect of EPA on the cell proliferation. EPA probably inhibits the cell proliferation through regulating the expression of CYP1 B1 in breast cancer.
出处
《肿瘤》
CAS
CSCD
北大核心
2012年第6期429-434,共6页
Tumor
基金
国家自然科学基金青年科学基金资助(编号:30901195)