迷迭香酸类似物-11通过抑制ERK/MAPK通路诱导人胃癌MGC-803细胞凋亡

目的对迷迭香酸类似物-11(rosmarinic acid analogue-11,RAA-11)诱导人胃癌MGC-803细胞凋亡及其机制进行初步探究。方法 MTT法和克隆形成法观察RAA-11对人胃癌MGC-803细胞增殖的抑制作用;Hoechst 33258染色法观察RAA-11对人胃癌MGC-803细胞核凋亡形态学的影响;流式细胞术检测RAA-11对人胃癌MGC-803细胞凋亡率的影响;Western blot观察RAA-11对人胃癌MGC-803细胞凋亡相关蛋白caspase-3、Bcl-2、Bax及通路蛋白ERK、p-ERK表达的影响。结果 MTT结果提示RAA-11可以抑制人胃癌MGC-803细胞增殖(P<0.01),且呈时间浓度依赖性;克隆形成实验结果提示,RAA-11能抑制人胃癌MGC-803细胞的集落形成能力;Hoechst 33258染色结果提示,RAA-11干预人胃癌MGC-803细胞48 h后,细胞核呈现典型凋亡形态学改变;流式细胞术结果提示,RAA-11对人胃癌MGC-803细胞有明显的促凋亡作用; Western blot结果显示,RAA-11上调人胃癌MGC-803细胞促凋亡相关蛋白caspase-3、Bax(P<0.01),下调抑凋亡相关蛋白Bcl-2的表达水平,并降低了通路蛋白ERK、p-ERK的表达水平(P<0.01)。结论 RAA-11能抑制人胃癌MGC-803细胞的增殖,并能够诱导凋亡,其机制可能与抑制ERK/MAPK通路有关。

Apoptosis of gastric cancer MGC-803 cells induced by rosmarinic acid analogue-11 by inhibiting ERK/MAPK pathway

Aim To explore the apoptosis and mechanisms of human gastric cancer cells MGC-803 induced by RAA-11. Methods MTT and colony assays were used to detect the survival of MGC-803 cells treated with RAA-11. The effect of RAA-11 on the apoptotic morphology of MGC-803 cells was observed by Hoechst 33258 staining. The effect of RAA-11 on the apoptosis rate of MGC-803 cells was detected with flow cytometry. The effects of RAA-11 on apoptosis related protein expression of caspase-3, Bcl-2 and Bax as well as pathway proteins ERK and p-ERK in MGC-803 cells were observed by Western blot. Results MTT assay showed that the proliferation of MGC-803 cells was effectively inhibited in a time- and concentration-dependent manner( P <0.01). The result of colony suggested that RAA-11 could inhibit the proliferation of MGC-803 cells. Hoechst 33258 staining indicated that the nucleus of MGC-803 cells had a typical apoptotic morphological change after intervention with RAA-11. The result of flow cytometry suggested that RAA-11 had a significant apoptotic effect on MGC-803 cells. The expressions of Bax and caspase-3 were significantly up-regulated( P <0.01), and the expressions of Bcl-2, ERK and p-ERK were down-regulated( P <0.01) in MGC-803 cells treated with RAA-11. Conclusions RAA-11 inhibits the proliferation and induces apoptosis in MGC-803 cells, which may be related to the inhibition of ERK/MAPK pathway.