原花青素上调let-7a抑制胰腺癌AsPC-1细胞生长及迁移

Proanthocyanidins inhibit pancreatic cancer As PC-1 cell growth and migration through upregulation of let-7a

目的探讨原花青素是否通过上调let-7a表达而抑制胰腺癌细胞生长及迁移。方法体外培养人胰腺癌As PC-1细胞,原花青素处理细胞后,分别用MTT法、Annexin V-FITC/PI双染及Transwell迁移等实验检测细胞增殖率、细胞凋亡率及细胞迁移能力的改变;利用mi RNA实时逆转录PCR检测细胞内let-7a表达变化。As PC-1细胞转染let-7a mimics后,MTT法、Transwell迁移实验分别检测细胞增殖率及细胞迁移能力的改变。结果与对照组相比,原花青素处理As PC-1细胞后,细胞增殖率、细胞迁移能力随着原花青素浓度升高而下降,而细胞凋亡率随着药物浓度升高而逐渐升高。与对照组相比,原花青素处理细胞后,let-7a的表达升高。通过脂质体转染let-7a mimics后,细胞的增殖率及迁移能力均低于对照组,且let-7a mimics与原花青素共同作用后,细胞增殖及迁移明显低于let-7a mimics和原花青素单独作用组。结论原花青素具有抑制胰腺癌细胞生长、迁移,及诱导细胞凋亡的作用。原花青素可能是通过上调let-7a表达,从而抑制胰腺癌细胞的生长及迁移。

Objective To ascertain whether proanthocyanidins inhibit cell growth and migration by increasing let-7a expression in pancreatic cancer AsPC-1 cells. Methods The proliferation rate, cell apoptosis rate and cell migration ability of AsPC-1 cells treated with proanthocyanidins were measured by MTT assay, Annexin V-FITC/PI staining, and Transwell migration assay, respectively. The expression of let-7a AsPC ceils was detected by miRNA real-time RT-PCR after proanthocyanidins treatment. The changes in the biological behaviors of AsPC-1 cells were evaluated after transfection with let-7a mimics. Results Compared with the control group, proanthocyanidins treatment caused dose-dependent decrements of the proliferation rate and migration ability and increased the apoptosis rate in AsPC-1 cells. AsPC-1 cells with proanthocyanidins treatment showed increased expression of let-7a. Transfection with let-7a mimics resulted in obvious decreases in the cell growth rate and migration ability, and proanthocyanidins treatment significantly enhanced the inhibitory effect of let-7a mimics. Conclusions Proanthocyanidins-induced cell growth and migration inhibition are partially mediated by up-regulation of let-7a expression in AsPC-1 cells.