目的建立稳定过表达N-cadherin的人类胃癌MGC-803细胞系。方法从含有N-cadherin的质粒中利用PCR技术克隆N-cadherin基因编码序列。制备并浓缩慢病毒颗粒,将构建好的过表达N-cadherin慢病毒载体感染MGC-803细胞,并稳定遗传,嘌呤霉素筛选...目的建立稳定过表达N-cadherin的人类胃癌MGC-803细胞系。方法从含有N-cadherin的质粒中利用PCR技术克隆N-cadherin基因编码序列。制备并浓缩慢病毒颗粒,将构建好的过表达N-cadherin慢病毒载体感染MGC-803细胞,并稳定遗传,嘌呤霉素筛选的阳性克隆传代培养5代后鉴定细胞内N-cadherin的表达。结果荧光显微镜下过表达N-cadherin组细胞有绿色荧光表达;PCR扩增得到含N-cadherin基因编码序列的特异性条带;重组的过表达N-cadherin载体中,过表达N-cadherin编码序列与目标序列几乎一致;Western blotting结果显示,在分子量为98 k D处有相应条带。结论成功建立稳定过表达N-cadherin的人类胃癌MGC-803细胞,此研究为进一步探讨N-cadherin基因的功能提供了良好的研究基础。展开更多
[目的]观察芪竹方对人胃腺癌MGC-803细胞Caspase-3及端粒酶增殖与凋亡的影响,探讨中药复方在抗肿瘤治疗中的作用机制。[方法]选用芪竹方500μg/ml在4、8、12、16 h 4个不同时间点及125、250、500μg/ml3个不同浓度在24 h作用人胃腺癌细...[目的]观察芪竹方对人胃腺癌MGC-803细胞Caspase-3及端粒酶增殖与凋亡的影响,探讨中药复方在抗肿瘤治疗中的作用机制。[方法]选用芪竹方500μg/ml在4、8、12、16 h 4个不同时间点及125、250、500μg/ml3个不同浓度在24 h作用人胃腺癌细胞MGC-803,分别采用Caspase-3分光光度法及TRAP银染法端粒酶活性检测法检测Caspase-3和端粒酶在人胃腺癌细胞MGC-803中的表达。[结果]芪竹方500μg/ml在16 h时可明显提高人胃腺癌细胞MGC-803中Caspase-3的活化程度,在250、500μg/ml作用24 h时可明显降低人胃腺癌细胞MGC-803端粒酶的活性。[结论]芪竹方可能通过介导人胃腺癌MGC-803细胞中Caspase-3的增殖及诱导端粒酶凋亡等多途径多靶点而发挥作用。展开更多
Malabaricone C (1), isolated from the seeds ofMyristicafragrans Houtt., belongs to a kind of diarylnonanoid compounds that are only found in Myristicaceae till now. In this study, biotransformation of 1 was investig...Malabaricone C (1), isolated from the seeds ofMyristicafragrans Houtt., belongs to a kind of diarylnonanoid compounds that are only found in Myristicaceae till now. In this study, biotransformation of 1 was investigated using rat hepatic microsomes for the first time and the main biotransformation product was elucidated as malabaricone B (2) according to the spectroscopic data. Further evaluation on human gastric cancer cell lines showed that the cytotoxic effects of malabaricone C and its metabolite malabaricone B were comparable to those of vinorelbine, with the values of IC50 of (42.62±3.10) and (19.80±1.70) μg/mL on NCI-N87, and (22.94±1.33) and (19.60±2.21) μg/mL on MGC803, respectively. Statistical analysis revealed that malabaricone B had significantly stronger cytotoxicity than the parent compound (P〈0.01 on NCI-N87 and P〈0.05 on MGC803), which may indicate a bioactivation of malabaricone C by hepatic microsomes. These results suggest that malabaricone C has a simple biotransformation pathway by hepatic microsomes and provide valuable information for further investigation on both the parent compound and its biotransformation product as anti-gastric cancer agents or lead compounds.展开更多
文摘目的建立稳定过表达N-cadherin的人类胃癌MGC-803细胞系。方法从含有N-cadherin的质粒中利用PCR技术克隆N-cadherin基因编码序列。制备并浓缩慢病毒颗粒,将构建好的过表达N-cadherin慢病毒载体感染MGC-803细胞,并稳定遗传,嘌呤霉素筛选的阳性克隆传代培养5代后鉴定细胞内N-cadherin的表达。结果荧光显微镜下过表达N-cadherin组细胞有绿色荧光表达;PCR扩增得到含N-cadherin基因编码序列的特异性条带;重组的过表达N-cadherin载体中,过表达N-cadherin编码序列与目标序列几乎一致;Western blotting结果显示,在分子量为98 k D处有相应条带。结论成功建立稳定过表达N-cadherin的人类胃癌MGC-803细胞,此研究为进一步探讨N-cadherin基因的功能提供了良好的研究基础。
基金National Natural Science Foundation of China(Grant No.30973863.81161120429)National Key Technology R&D Program of China(Grant No.2011BAI07B08)
文摘Malabaricone C (1), isolated from the seeds ofMyristicafragrans Houtt., belongs to a kind of diarylnonanoid compounds that are only found in Myristicaceae till now. In this study, biotransformation of 1 was investigated using rat hepatic microsomes for the first time and the main biotransformation product was elucidated as malabaricone B (2) according to the spectroscopic data. Further evaluation on human gastric cancer cell lines showed that the cytotoxic effects of malabaricone C and its metabolite malabaricone B were comparable to those of vinorelbine, with the values of IC50 of (42.62±3.10) and (19.80±1.70) μg/mL on NCI-N87, and (22.94±1.33) and (19.60±2.21) μg/mL on MGC803, respectively. Statistical analysis revealed that malabaricone B had significantly stronger cytotoxicity than the parent compound (P〈0.01 on NCI-N87 and P〈0.05 on MGC803), which may indicate a bioactivation of malabaricone C by hepatic microsomes. These results suggest that malabaricone C has a simple biotransformation pathway by hepatic microsomes and provide valuable information for further investigation on both the parent compound and its biotransformation product as anti-gastric cancer agents or lead compounds.