AIM: To investigate the growth effects of 4-phenyl butyric acid (PBA) on human gastric carcinoma cells and their mechanisms. METHODS: Moderately-differentiated human gastric carcinoma SGC-7901 and lowly-differentiated...AIM: To investigate the growth effects of 4-phenyl butyric acid (PBA) on human gastric carcinoma cells and their mechanisms. METHODS: Moderately-differentiated human gastric carcinoma SGC-7901 and lowly-differentiated MGC-803 cells were treated with 5, 10, 20, 40, and 60 μmol/L PBA for 1-4 d. Cell proliferation was detected using the MTT colorimetric assay. Cell cycle distributions were examined using flow cytometry.RESULTS: The proliferation of gastric carcinoma cells was inhibited by PBA in a doseand time-dependent fashion. Flow cytometry showed that SGC-7901 cells treated with low concentrations of PBA were arrested at the G0/G1 phase, whereas cells treated with high concentrations of PBA were arrested at the G2/M phase. Although MGC-803 cells treated with low concentrations of PBA were also arrested at the G0/G1 phase, cells treated with high concentrations of PBA were arrested at the S phase. CONCLUSION: The growth inhibitory effect of PBA on gastric cancer cells is associated with alteration of the cell cycle. For moderately-differentiated gastric cancer cells, the cell cycle was arrested at the G0/G1 and G2/M phases. For lowly-differentiated gastric cancer cells, the cell cycle was arrested at the G0/G1 and S phases.展开更多
基金Supported by Natural Science Foundation of Ningbo, No. 2009A610134Natural Sciences Foundation of Zhejiang, No. Y207244+3 种基金College Students’ Science-Technology Innovation Program of Zhejiang Province, No. 200959the Excellent Disser-tation Foundation of Ningbo University, No. 201014KC Wong Magna Fund of Ningbo Universitythe Scientific Innovation Team Project of Ningbo, No.2011B82014
文摘AIM: To investigate the growth effects of 4-phenyl butyric acid (PBA) on human gastric carcinoma cells and their mechanisms. METHODS: Moderately-differentiated human gastric carcinoma SGC-7901 and lowly-differentiated MGC-803 cells were treated with 5, 10, 20, 40, and 60 μmol/L PBA for 1-4 d. Cell proliferation was detected using the MTT colorimetric assay. Cell cycle distributions were examined using flow cytometry.RESULTS: The proliferation of gastric carcinoma cells was inhibited by PBA in a doseand time-dependent fashion. Flow cytometry showed that SGC-7901 cells treated with low concentrations of PBA were arrested at the G0/G1 phase, whereas cells treated with high concentrations of PBA were arrested at the G2/M phase. Although MGC-803 cells treated with low concentrations of PBA were also arrested at the G0/G1 phase, cells treated with high concentrations of PBA were arrested at the S phase. CONCLUSION: The growth inhibitory effect of PBA on gastric cancer cells is associated with alteration of the cell cycle. For moderately-differentiated gastric cancer cells, the cell cycle was arrested at the G0/G1 and G2/M phases. For lowly-differentiated gastric cancer cells, the cell cycle was arrested at the G0/G1 and S phases.
文摘扫描近场光学显微镜突破衍射极限,具有纳米量级的空间分辨率,量子点(QD s)标记有荧光强度高且抗光漂白能力强等优点。结合上述两种技术,对人胃腺癌SGC-7901细胞膜表面特异性结合的叶酸受体(FR)进行成像探测,获得了叶酸受体在SGC-7901细胞膜表面上的分布,以及细胞内化外源性叶酸过程中叶酸受体在细胞膜表面的分布变化,成像的光学分辨率达到120 nm。实验结果表明:特异性结合的叶酸受体在SGC-7901细胞膜表面的分布,绝大部分是以聚集体的形式存在。随着SGC-7901细胞内化叶酸量的增加,叶酸受体在细胞膜表面的分布密度逐渐降低,并在经过120 m in左右趋于稳定。上述方法和手段为实现单细胞水平上靶点分布和变化的长期监测,肿瘤细胞内化受体的机制研究提供了新的技术途径。