【摘要】 目的 :探讨乳腺癌细胞中脂肪酸代谢的变化及抑制脂肪酸合成酶对乳腺癌细胞生长的影响及其作用机制。方法 :通过RT PCR方法对乳腺癌等四种肿瘤细胞株中FASmRNA的表达进行观察比较 ;应用MTT法观察脂肪酸合成酶抑制剂浅蓝霉素 (Cerulenin)对乳腺癌细胞MCF 7生长的影响 ;通过流式细胞仪检测细胞周期变化。　结果 :FASmRNA在乳腺癌细胞MCF 7中呈高表达。浅蓝霉素可抑制乳腺癌细胞MCF 7生长 ,2 .5、5、10和 2 0mg/L的浅蓝霉素作用 4 8h的抑制率分别为 (4 3.4 7± 4 .5 8) %、(6 2 .92± 2 .6 8) %、(81.93± 0 .91) %和 (6 7.7± 12 .2 7) % (与对照组比P <0 .0 5 )。软脂酸可以部分逆转浅蓝霉素对MCF 7细胞生长的抑制作用。流式细胞仪测定显示 ,浅蓝霉素引起MCF 7细胞发生G2 /M期阻滞。 4 8h组 ,浅蓝霉素 10mg/L使 (6 3.33± 18.31) %的MCF 7细胞阻滞于G2 /M期 (与对照组比P <0 .0 1)。　结论 :乳腺癌细胞中脂肪酸合成代谢增强 ,抑制脂肪酸合成酶可诱导乳腺癌细胞发生G2 /M期阻滞 ,进而抑制乳腺癌细胞的增殖更多还原

【Abstract】 Objectives:To observe the changes in metabolism of fatty acids in breast cancer cells and the effects of inhibiting fatty acid synthase(FAS) on the growth of breast cancer cells. Methods:By RT PCR,the expression of FAS mRNA in breast cancer cell line was examined.The growth inhibition of breast cancer cells by specific FAS inhibitor, cerulenin, was determined by MTT assay.Flow cytometric analysis was used to study the changes of cell cycle. Results:FAS mRNA expression in MCF 7 cells was high.We found that cerulenin caused dose and time dependent inhibition of growth of MCF 7 cells.The growth inhibition of MCF 7 after 48 hours exposure of cerulenin at 2.5,5,10 and 20 mg/L was ( 43.47 ±4.58)%,(62.92±2.68)%,(81.93±0.91)% and (67.7±12.27)%( P<0.05 vs. Control),respectively.Addition of the main product of FAS,palmitic acid,partially reversed the growth inhibtory effects of cerulenin, indicating growth inhibition of cerulenin on cancer cells was due to FAS inhibition.Flow cytometric analysis showed that the treatment of cerulenin resulted in a block in G 2/M phase of the cell cycle of MCF 7 cells.The cell arrested in G 2/M phase by 48 hours exposure to cerulenin at 10 mg/L was (63.33±18.31)%( P<0.05 vs. Control). Conclusions:The expression of FAS in breast cancer cells is elevated.Inhibtion of FAS can kill breast cancer cells by inducing G 2/M block.更多还原