丁苯酞通过混合谱系激酶3信号通路对1-甲基-4-苯基-吡啶离子诱导的SH-SY5Y细胞增殖和凋亡的影响

摘要

目的 探讨丁苯酞对1-甲基-4-苯基-吡啶离子(MPP+)诱导的SH-SY5Y细胞混合谱系激酶3(MLK3)通路的影响,及其对细胞增殖与凋亡的作用机制.方法 对数生长期SH-SY5Y细胞分为对照组、MPP+组、丁苯酞组和URMC-099组,对照组正常培养,MPP+组加1 mmol/L MPP+培养24 h,丁苯酞组予10μmol/L丁苯酞预处理3 h后,加入MPP+培养24 h,URMC-099组予200 nmol/L MLK3通路特异性抑制剂URMC-099预处理3 h后,加入MPP+培养24 h.倒置相差显微镜观察细胞形态,噻唑蓝比色法检测细胞活性,Annexin-V/PI双染流式细胞术检测细胞凋亡率,Hoechst33342荧光染色法观察凋亡细胞,Western blotting检测MLK3磷酸化蛋白(p-MLK3)、c-Jun氨基末端激酶磷酸化蛋白(p-JNK)和细胞外调节蛋白激酶磷酸化蛋白(p-ERK1/2)的表达.结果 MPP+组细胞存活率低于对照组(P<0.05),丁苯酞组和URMC-099组细胞存活率高于MPP+组(P<0.05);MPP+组细胞凋亡率高于对照组(P<0.05),丁苯酞组和URMC-099组细胞凋亡率低于MPP+组(P<0.05);与对照组相比,MPP+组p-MLK3、p-JNK蛋白表达量增加(P<0.05),p-ERK1/2蛋白表达量降低(P<0.05);与MPP+组相比,丁苯酞组和URMC-099组p-MLK3、p-JNK蛋白表达量降低(P<0.05), p-ERK1/2蛋白表达量升高(P<0.05).结论 丁苯酞可减少MPP+诱导的SH-SY5Y细胞凋亡,促进细胞增殖,其机制可能是通过抑制MLK3通路,调节下游p-JNK、p-ERK1/2蛋白表达.%Objective To investigate the effects of DL-3-n-Butylphthalide(NBP)on proliferation and apoptosis of 1-methyl-4-phenyl-pyridinium (MPP +)-induced SH-SY5Y cells, and mechanisms via mixed lineage kinase 3 (MLK3) signaling pathway. Methods The SH-SY5Y cells were divided into control group,MPP+group,NBP group and URMC-099 group,that cultured normally,with 1 mmol/L MPP+for 24 hours,with 10μmol/L NBP for 3 hours and then with MPP+for 24 hours,and with 200 nmol/L MLK3 inhibitor URMC-099 for 3 hours and then with MPP+for 24 hours,respectively.The morphology of SH-SY5Y cells was observed under inverted phase contrast mi-croscope and the survival rate was measured with 3-(4,5-Cimethylthiazol-2-yl)-2,5-diphenyl tetrazolium bromide assays.The apoptosis was quantified under flow cytometry with Annexin V/PI fluorescence staining,and the nuclear morphology was observed with Hoechst 33342 staining.The expression of phosphorylated protein of MLK3(p-MLK3),c-Jun N-terminal kinase(p-JNK),extra cellular regulated protein ki-nases(p-ERK1/2)were detected with Western blotting.Results Compared with the control group,the survival rate reduced and apoptosis in-creased in MPP+group(P<0.05),with the increase of p-MLK3 and p-JNK and decrease of p-ERK1/2 d(P<0.05).Compared with MPP+group,the survival rate increased and apoptosis reduced in both NBP and URMC-099 groups(P<0.05),with the decrease of p-MLK3 and p-JNK and increase of p-ERK1/2(P<0.05).Conclusion NBP can decrease the apoptosis and promote the proliferation of SH-SY5Y cells in-duced by MPP+,which may be associated with inhibiting MLK3 signaling pathway,and regulating the downstream p-JNK and p-ERK1/2.