摘要
目的研究P21蛋白和生存素(survivin)在美伐他汀诱导非小细胞肺癌(NSCLC)细胞凋亡中的作用及其分子机制。方法应用MTT法检测美伐他汀对A549、NCI-H520细胞株的抑制作用,应用流式细胞仪、透射电镜研究美伐他汀对A549、NCI-H520细胞株的细胞周期阻滞和诱导凋亡作用,应用流式细胞仪和RT-PCR检测P21蛋白、P21mRNA、生存素mRNA的表达。结果MTT试验表明美伐他汀对A549、NCI-H520增殖有明显的抑制作用;流式细胞仪检测显示美伐他汀诱导A549、NCI-H520细胞G0/G1期阻滞;AnnexinV结果证实美伐他汀可诱导A549、NCI-H520细胞凋亡,而且凋亡率随剂量的增加而增加。美伐他汀对A549、NCI-H520细胞P21mRNA及P21总蛋白的表达无影响,但可使P21胞膜蛋白的表达下降。美伐他汀作用后生存素mRNA表达下降。加入甲羟戊酸可完全逆转美伐他汀的上述作用。结论美伐他汀通过甲羟戊酸途径诱导NSCLCG0/G1期阻滞,抑制增殖,诱导细胞凋亡,其机制可能与抑制P21蛋白异戊二烯化和下调生存素mRNA表达有关。
Objective To investigate the role of P21 protein and survivin on the cell apoptosis of non-small cell lung cancer （NSCLC） induced by mevastatin. Methods The inhibitory effect of mevastatin on A549 and NCI-H520 cell line was evaluated by MTT assay. The cell cycle distribution and apoptosis induction were determined with flow cytometer and transmission electron microscope. The expression of p21 protein was assessed with flow cytometer. The mRNA expression of p21 and survivin was assessed with RT-PCR. Results Flow cytometry showed that mevastatin induced G0/C1 cell arrest in NSCLC cell lines. The results indicated that mevastatin caused apoptosis in concentration-dependent manner. Mevastatin produced no change in expression of P21 mRNA and total P21 protein. Concomitantly, P21 protein localized on cellular membrane was decreased. It was also found that mevastatin suppressed the expression of survivin mRNA in NSCLC cell lines. All these effects were reversed by mevalonate. Conclusions Mevastatin inhibited the proliferation of NSCLC cell lines. Mevastatin exerts growth inhibitory effect and induces apoptosis effect by inhibiting mevalonate synthesis. Its mechanisms might involve blockade of the isoprenylation of p21 protein and down-regulation of the expression of survivin mRNA.
出处
《解放军医学杂志》
CAS
CSCD
北大核心
2006年第9期873-875,共3页
Medical Journal of Chinese People's Liberation Army
