生长抑素类似物联合丝裂霉素对胃癌细胞的抑制作用

目的:探讨生长抑素类似物奥曲肽(OCT)联合细胞毒化疗药物丝裂霉素(MMC)对胃癌细胞系SGC-7901的抑制作用.方法:体外培养人胃癌细胞株SGC-7901,分别设空白组、对照组、OCT组、MMC组以及OCT+MMC组.用MTT比色法观察对胃癌细胞生长的影响;用免疫组织化学法分析对细胞凋亡调节基因Bcl-2表达的影响.结果:在OCT组中,当浓度从1×10-9g/L到1×10-3g/L变化时,OCT对胃癌细胞均有抑制,当OCT为1×10-3 g/L时.其抑制作用最明显(20.9%,P<0.05).MMC随着浓度由1×10-4g/L增加至1 X 10-2g/L其抑制率也由14.1%增加至71.1%,呈递增趋势.OCT联合MMC的抑制作用随着MMC浓度由1×10-3g/L增加至5×10-3g/L,抑制率也由22%增加至45.8%(均P<0.05);当MMC为5×10-3g/L时,联合治疗组优于单独给药组(54.8% vs 30.4%,P<0.05).OCT、MMC及OCT+MMC均可以下调Bcl-2的表达,阳性细胞数分别为12.9%、6.7%和5.0%(均P<0.05),其中OCT+MMC组下调作用最明显.结论:OCT联合MMC可以增强对胃癌细胞的抑制作用,联合应用可以减低MMC的剂量.

Octreotide enhances the inhibitory effects of mitomycin on the growth of gastric cancer SGC-7901 cells

AIM:To investigate the synergistic effects of somatostatin analogue octreotide (OCT) and chemotherapeutic drug mitomycin (MMC) on the growth of gastric cancer SGC-7901 cells.METHODS:SGC-7901 cells were cultured in vitro and divided into four groups:control group,OCT group,MMC group and OCT plus MMC group.The proliferation of SGC-7901 cells was evaluated by methyl thiazolyl tetrazolium (MTT) assay.The expression of apoptosis-related protein Bcl-2 was measured by immunohistochemistry.RESULTS:OCT at concentrat...