幽门螺杆菌对胃癌上皮细胞株AGS细胞的生长抑制作用及其分子机理探讨

目的 观察体外实验中幽门螺杆菌(Hp)对胃癌上皮细胞株AGS细胞生长的影响,探讨Hp致病的分子机理。方法 胃癌细胞系AGS细胞体外培养,加入Hp活菌后,通过形态观察、细胞计数了解细胞生长情况;通过细胞核荧光染色、细胞DNA电泳检测细胞凋亡;通过流式细胞技术观察Hp对AGS细胞周期的影响,并进一步检测相应的细胞周期素。结果 Hp对AGS细胞生长有抑制作用。加入Hp后细胞凋亡增加,并导致G1／S细胞周期阻滞,伴有细胞周期素D1表达上调。结论 Hp急性感染可抑制AGS细胞生长,此作用可能与其诱导细胞凋亡及细胞周期阻滞有关。提示Hp感染能够破坏正常细胞周期调节。

Helicobacter pylori inhibits cell growth and induces G1/S arrest in AGS gastric epithelial cells

Objective To observe the effects of Helicobacter pylori (H. pylori ) on growth and cell cycle progression of AGS gastric epithelial cells. Methods AGS cells and H. pylori were co cultured for 1 4 days. Vital cell numbers were counted by heamatocounter. Apoptosis was detected by fluorescence stain of cell nucleus and DNA agarose electrophoresis. Cell cycle was analyzed by flow cytometry technique. Results During co culture of AGS cells and H. pylori , cell growth inhibition was observed. H. pylori induces apoptosis and cell cycle arrest from G1 to S phase accompanied by high expression of cyclinD1. Conclusion Exposure of gastric epithelial cells to H. pylori causes block of G1 to S progression of cell cycle and alters expression of cyclinD1. The cell cycle arrest and the associated induction of apoptosis are responsible for the growth inhibition of gastric epithelial cells caused by H. pylori .