戊地昔布对人胃癌细胞生长的抑制作用

目的　探讨选择性环氧化酶 2 (COX 2 )抑制剂戊地昔布对人胃癌BGC 82 3细胞的作用及其作用机制。方法　用MTT法检测戊地昔布对人胃癌BGC 82 3细胞生长的作用 ,用流氏细胞仪检测细胞凋亡和细胞周期分布 ,用激光共聚焦显微镜、透射电镜和DNA片段进一步检测细胞凋亡 ,用乳酸脱氢酶 (LDH)试剂盒测定BGC 82 3细胞的LDH含量。结果　戊地昔布 (2 5～ 4 0 0 μmol·L-1 )可时间和浓度依赖性抑制人胃癌BGC 82 3细胞的生长 ,作用 72h后 ,对细胞生长抑制率可达 2 4 0 %～ 92 0 % ,凋亡率由 (2 6± 0 7) %增加到 (7 6±1 5 ) %～ (1 6 5± 1 5 ) %。 1 0 0～ 4 0 0 μmol·L-1 也降低增殖指数 ,减少细胞周期S期细胞 ,增加G0 /G1 期细胞。随浓度增加 ,戊地昔布引起的LDH释放率有增加趋势 ,但只有 4 0 0μmol·L-1 戊地昔布可显著增加LDH释放率。结论　戊地昔布可通过诱导凋亡和细胞周期停滞而抑制人胃癌BGC 82 3细胞生长 ,4 0 0 μmol·L-1 戊地昔布抑制BGC 82 3细胞生长作用与细胞坏死有关

Inhibition of valdecoxib on the proliferation of human gastric cancer cells

AIM To study the effect and mechanism of valdecoxib, a selective COX 2 inhibitor, on human gastric cancer BGC 823 cells. METHODS MTT assay and flow cytometry were used to observe the effect of valdecoxib on proliferation, apoptosis and the cell cycle distribution of BGC 823 cells. Laser confocal microscopy, transmission electron microscope and DNA fragmentation assay were further used to detect the apoptosis. The content of LDH was examined using LDH kit. RESULTS Valdecoxib in 25～400 μmol·L -1 significantly inhibited the proliferation of BGC 823 cell in a time and dose dependent fashion, the inhibition rate of proliferation was 24 0%～92 0% after 72 h, and the rate of apoptosis was increased from (2 6±0 7)% to (7 6±1 5) %～(16 5±1 5)%. 100～400 μmol·L -1 valdecoxib also decreased the proliferation index and the proportion of cells in the S phase, increased the proportion of cells in the G 0/G 1 phase, but had no effect on the proportion of cell in the G 2/M phase. CONCLUSION Valdecoxib inhibits human gastric cancer BGC 823 cells growth by inducing apoptosis and cell cycle arrest. The growth inhibitory effect of 400 μmol·L -1 valdecoxib is also associated with cell necrosis.