齐墩果酸对顺铂耐药胃癌SGC-7901细胞增殖的影响及其机制研究

目的探讨齐墩果酸对顺铂耐药胃癌SGC-7901细胞增殖的影响及其作用机制。方法体外诱导建立人胃癌顺铂耐药细胞株SGC-7901/CDDP,MTT比色法检测SGC-7901/CDDP细胞活力;适时荧光定量PCR分析凋亡相关基因Bcl-2及BaxmRNA的表达。结果MTT实验证明齐墩果酸对SGC-7901/CDDP细胞的生长有抑制作用,100μmol.L-1齐墩果酸作用72h对SGC-7901/CDDP细胞的抑制率达62%,并表现为时间和剂量依赖性;适时荧光定量PCR实验证明,SGC-7901/CDDP细胞经齐墩果酸处理后,促凋亡基因Bax表达上调,抗凋亡基因Bcl-2表达下调。结论齐墩果酸在体外能够抑制SGC-7901/CDDP细胞增殖,并使促凋亡基因Bax表达升高,抗凋亡基因Bcl-2表达降低,上调Bax和下调Bcl-2mRNA的表达可能是其作用机制之一。

Effects of oleanolic acid on proliferation of SGC-7901/CDDP in vitro and its potential mechanisms

Aim To investigate the effects of oleanolic acid on proliferation of SGC-7901/CDDP cells in vitro and its potential mechanisms.Methods Model of SGC-7901 cells resistant to cisplatin(SGC-7901/CDDP)was established in vitro.MTT assay was used to evaluate the viability of SGC-7901/CDDP cells in vitro.Real-time PCR was used to analyse the expression of Bcl-2 and Bax gene.Results MTT assay showed that oleanolic acid dramatically inhibited the proliferation of SGC-7901/CDDP cells in vitro,more than 62% SGC-7901/CDDP cells were inhibited when the cells were treated with 100 μmol·L-1 oleanolic acid for 72 h;Real-time PCR showed that Bax(pro-apoptotic gene)was upregulated and Bcl-2(anti-apoptotic)was downregulated after being treated with oleanolic acid.Conclusions These results suggest that oleanolic acid inhibits proliferation of SGC-7901/CDDP cells in vitro,and its potential mechanisms may be through the upregulation of Bax and the downregulation of Bcl-2.