Effect of combination of eicosapentaenoic acid and epirubicin on human gastric carcinoma cell strain MGC-803 / 中国医学科学院学报

<p><b>OBJECTIVE</b>To evaluate the effect of combination of eicosapentaenoic acid (EPA) and The effects of EPA and epirubicin (EPI) on the human gastric carcinoma cell MGC-803 in vitro.</p><p><b>METHODS</b>EPI were measured by MTT assay , and the interaction between these two agents was evaluated by the isobologram technique of Berenbaum. Morphous of cell was observed by phase-contrast and electron microscope. Flow cytometry was used for cell cycle analysis.</p><p><b>RESULTS</b>EPA significantly inhibited the growth of MGC-803 cells in a dose- and time-dependent way (P < 0.01). Numerous abnormal particles were found around the nucleus of MGC-803 cells under phase-contrast microscope, and also many electron-dense material in cytoplasm were found under electron microscope. EPA significantly stimulated the growth of human embryonal pulmonary fibroblast (HPF) dose-dependently (P < 0.01). A strong synergism was found between EPA and EPI in MGC-803 cells. EPA induced G0/G1-phase arrest but without statistical significance (P > 0.05), and EPI significantly induced S-phase arrest (P < 0.05) in MGC-803 cells.</p><p><b>CONCLUSIONS</b>EPA can inhibit cell growth in gastric carcinoma cells but not in normal cells. EPA and EPI have synergetic effect in the inhibition of gastric carcinoma cells. Compared with EPI monotherapy, the combination of EPI and EPA can reduce the dosage of EPI.</p>

Effect of combination of glutamine and mitomycin C on human gastric carcinoma cell strain MGC-803 / 中国医学科学院学报

<p><b>OBJECTIVE</b>To evaluate the effect of combination of glutamine (GLN) and mitomycin C (MMC) on the human gastric carcinoma cell line MGC-803 in vitro.</p><p><b>METHODS</b>The effects of GLN and MMC were measured by MTT assay, and the interaction between the two agents was evaluated by the median-effect principle. Flow cytometry was used for cell cycle analysis.</p><p><b>RESULTS</b>GLN did not significantly stimulate the cell growth in vitro. High-concentration of GLN could inhibit the cell growth. MMC could effectively inhibit the cell growth in a time-dependent manner. The interaction of these two agents showed a weak antagonistic activity (1 < CI < 1.2703). MMC induced remarkable S-phase arrest. Low-dose GLN has limited effect on the S-phase arrest of MMC, while high-dose GLN significantly attenuated the S-phase arrest and lowered the proliferation index of MGC-803 cell.</p><p><b>CONCLUSIONS</b>Combination of GLN and MMC has a a weak and dose-dependent antagonistic activity in the treatment of gastric carcinoma cell line MGC-803. The combination of high-dose MMC and low-dose GLN may achieve better efficacy.</p>