南海真菌代谢物1386A对胃癌MCG-803细胞增殖、凋亡和膜电位的影响

目的:研究南海真菌代谢物1386A对胃癌MCG-803细胞的作用。方法:采用MTT细胞活性检测法检测1386A对MCG-803细胞活性的影响,用集落形成实验检测1386A对MCG-803细胞增殖能力的影响,用流式细胞仪检测1386A对MCG-803细胞周期分布、凋亡、线粒体膜电位的影响。结果:1386A作用于MCG-803细胞24、48和72h后,MTT检测细胞活性的IC50分别为29.70、14.07和13.47μmol/L,1386A作用48h后集落形成实验检测MCG-803细胞增殖的IC50为3.27μmol/L,1386A作用48h后MCG-803细胞的S期比例由25.6%上升为56.8%,1386A作用24h后MCG-803细胞早期凋亡率由3.34%上升为8.39%,1386A作用24h后MCG-803细胞线粒体膜电位下降率为56.26%。结论:南海真菌代谢物1386A能明显抑制胃癌MCG-803细胞的生长,可能通过线粒体凋亡途径诱导细胞的凋亡。

吡格列酮对人胃癌细胞MCG-803生长及基因表达的影响

目的探讨过氧化物酶体增殖物激活受体γ(PPARγ)配体吡格列酮对人胃癌细胞株MCG-803生长及基因表达的影响。方法不同浓度吡格列酮作用于MCG-803后,分别应用四甲基偶氮唑盐比色法(MTT)、Annexin V/PI双染色流式细胞术、荧光定量PCR法(RT-PCR)检测细胞增殖状态、细胞凋亡率及PPARγ基因表达水平。结果不同浓度吡格列酮均可显著抑制MCG-803细胞增殖(P<0.01),且呈时间、剂量依赖性;48小时后细胞凋亡率较对照组显著增加(P<0.01);随着吡格列酮浓度增加,PPARγ基因表达呈升高趋势。结论吡格列酮呈剂量及时间依赖性抑制人胃癌细胞株MCG-803生长,并促进其凋亡;PPARγ在MCG-803中有表达且随着吡格列酮浓度增加表达上调。

15d-PGJ_2 inhibits cell growth and induces apoptosis of MCG-803 human gastric cancer cell line

AIM: To investigate the influence of peroxisome proliferator activated receptor γ (PPARγ) ligand, 15-deoxy-△12, 14-prostaglandin J2 (15dPGJ2) on the proliferation and apoptosis of MCG-803 human gastric cancer cell lines.METHODS: Cell proliferation was measured by 3H-TdR assay. Apoptosis was determined by ELISA and TUNEL staining. Protein and mRNA level of bcl-2 family and COXs were measured by Western blotting and Northern blotting respectively. PGE2 production was examined by RIA.RESULTS: 15dPGJ2 inhibited cell growth and induced apoptosis of MlCG-803 cells. The COX-2 and bcl-2/bax ratios were decreased following 15dPGJ2 treatment. The PGE2production in supernatants was also decreased. These changes were in a dose-dependent manner.CONCLUSION: 15dPGJ2 may be a useful therapeutic agent for the treatment of gastric cancer.

小檗碱对人胃癌细胞增殖、细胞周期及CD44V6表达的影响

目的 :研究小檗碱对人胃癌MGC 80 3细胞增殖、细胞周期及CD4 4V6分子表达的影响 ,探讨其抗肿瘤及抗肿瘤转移作用机制。方法 :MTT法检测小檗碱对人胃癌MGC 80 3细胞体外增殖作用。激光共聚焦显微镜观察用药后细胞形态的改变并用流式细胞仪检测细胞周期的变化。应用免疫组化和流式细胞术技术检测药物对细胞表面CD4 4V6表达的影响。结果 :小檗碱对MGC 80 3细胞有显著抑制作用 ,在 10、2 0、4 0 μg ml浓度下 ,其抑制率分别为 36 2 %、4 9 7%和 5 9 3% ,有明显剂量依赖关系。激光共聚焦显微镜下细胞核固缩 ,并可见凋亡小体。药物可将细胞阻滞在G0 G1期 ,并使细胞表面的CD4 4V6表达降低。结论 :小檗碱可通过诱导MGC 80 3细胞凋亡并将细胞阻滞在G0 G1期 ,发挥抑制瘤细胞的体外增殖作用 ;小檗碱可降低MGC 80 3细胞株CD4 4V6的表达 。