浅蓝菌素联合吉西他滨对人胰腺癌细胞BxPC3增殖与凋亡的影响

Effect of cerulenin combined with gemcitabine on proliferation and apoptosis in human pancreatic cell line BxPC3

目的 观察浅蓝菌素联合吉西他滨对胰腺癌细胞BxPC3生长抑制的协同作用,探讨其机制.方法 以10μg/ml浅蓝菌素、20μmol/L吉西他滨、10 μg/ml浅蓝菌素＋20μg/L吉西他滨分别处理对数生长期的人胰腺癌BxPC3细胞48 h,以不经药物处理的细胞作为对照.应用CCK-8法检测各组细胞增殖,AnnexinV/PI双染法检测细胞早期凋亡率,RT-PCR法检测Bcl-2、Bax mRNA表达,蛋白质印迹法检测Bcl-2、Bax蛋白表达.结果 对照组、浅蓝菌素组、吉西他滨组、联合处理组48 h的生长抑制率分别为0、（51.28±1.84）％、（53.59±1.62）％、（84.57 ±1.01）％;细胞早期凋亡率为（0.83±0.31）％、（31.37±1.04）％、（38.33±0.75）％、（69.43±0.83）％;BxPC3细胞Bcl-2 mRNA表达量分别为0.67±0.01、0.44±0.01、0.36±0.08、0.27 ±0.07;Bax mRNA表达量为0.14±0.01、0.31±0.02、0.32±0.03、0.91±0.06;Bcl-2 mRNA/Bax mRNA比值为4.78±0.13、1.39±0.04、1.15±0.02、0.30±0.02;Bcl-2蛋白表达量分别为1.24±0.04、0.51±0.02、0.42±0.02、0.13±0.01;Bax蛋白表达量为0.20±0.05、0.47±0.01、0.54±0.01、1.21±0.03;Bcl-2/Bax比值为6.00±0.11、1.11±0.01、0.77±0.03、0.10±0.06.各处理组与对照组,联合处理组与单药处理组的差异均有统计学意义（P值均＜0.01）.结论 浅蓝菌素与吉西他滨对人胰腺癌BxPC3细胞的生长抑制具有协同作用,其机制可能通过上调Bax基因表达,下调Bcl-2基因表达,降低Bcl-2/Bax比值而促进细胞凋亡所致.

Objective To investigate the effect and mechanism of action in pancreatic cancer BxPC3 cell treated by cerulenin in combination with gemcitabine.Methods BxPC3 cells were cultivated with 10 μg/ml cerulenin,20 μmol/L gemcitabine or 10 μg/ml cerulenin ＋ 20 μmol/L gemcitabine for 48 h,and cells without treatment were control.Cell proliferation was detected by CCK-8 assay,and early apoptosis was detected by AnnexinV/PI double staining method.The expression of Bcl-2 mRNA and Bax mRNA were detected by RT-PCR,and the protein level of Bcl-2,Bax were detected by Western Blot.Results The inhibition rate of BxPC3 cells were 0,（51.28 ± 1.84） ％,（53.59 ± 1.62） ％,（84.57 ± 1.01） ％ in control,cerulenin group,gemcitabine group,combination group; and the rate of early apoptosis was （0.83 ± 0.31） ％,（31.37 ± 1.04） ％,（38.33 ± 0.75） ％,（69.43 ± 0.83） ％,and the expression of Bcl-2 mRNA was 0.67 ± 0.01,0.44 ±0.01,0.36 ±0.08,0.27 ±0.07,and the expression of Bax mRNA was 0.14 ±0.01,0.31 ± 0.02,0.32 ± 0.03,0.91 ± 0.06 ; while the ratio of Bcl-2 mRNA/Bax mRNA was 4.78 ± 0.13,1.39 ± 0.04,1.15 ± 0.02,0.30 ± 0.02 ; the expression of Bcl-2 protein was 1.24 ± 0.04,0.51 ± 0.02,0.42 ± 0.02,0.13 ±0.01 ; and the expression of Bax protein was 0.20 ± 0.05,0.47 ± 0.01,0.54 ± 0.01,1.21 ± 0.03 ; while the ratio of Bcl-2/Bax was 6.00 ± 0.11,1.11 ± 0.01,0.77 ± 0.03,0.10 ± 0.06.And the difference among the groups was statistically significant （P ＜ 0.01）.Conclusions Cerulenin combined with gemcitabin has synergistic effect on the inhibition of BxPC cells proliferation.Its mechanisms may be up-regulation of Bax,down-regulation of Bcl-2,and promoting apoptosis of cells through the decrease of Bcl-2/Bax ratio.