减毒沙门菌介导的TRAIL和VP3对胃癌细胞的生长抑制作用及其机制
Journal Title: Di-er Junyi Daxue Xuebao - Year 2008, Vol 29, Issue 11
Abstract
目的:利用沙门菌作为真核质粒携带载体,在体内外观察肿瘤坏死因子相关凋亡诱导配体(TRAIL)和鸡贫血病毒VP3基因对胃癌细胞的生长抑制作用。方法:将重组质粒pBud-TRAIL、 pBud-VP3、 pBud-TRAIL-VP3电转化减毒沙门菌SL7207,经稳定性鉴定后直接转染胃癌细胞株SGC-7901,24 h后利用荧光显微镜观察有无融合绿色荧光蛋白表达,MTT法检测表达载体对胃癌细胞的生长作用,流式细胞仪检测细胞凋亡率及周期变化,并用免疫组织化学方法检测该载体对胃癌细胞Caspase-3、Caspase-9表达的影响。荷瘤小鼠口服携带重组质粒的减毒沙门菌,8周后通过RT-PCR检测肿瘤组织内真核载体的表达状况,并测量荷瘤瘤体大小。 结果:重组质粒能够在减毒沙门菌中稳定存在,经减毒沙门菌介导转染胃癌细胞后能够较好的表达,转染48 h后可见到TRAIL和VP3对胃癌细胞生长有抑制作用,流式细胞仪观察到pBud-TRAIL-VP3能使胃癌细胞的凋亡率明显增高,TRAIL和VP3能够协同促进胃癌细胞Caspase-3、Caspase-9的表达。体内实验提示pBud-TRAIL-VP3沙门菌载体能够在肿瘤组织中表达并能抑制肿瘤生长(P<0.05)。结论:减毒沙门菌将外源基因VP3和TRAIL基因导入胃癌细胞后,体内外实验证实该载体对胃癌细胞的生长起明显抑制作用,TRAIL和VP3联合作用机制与促进Caspase-3、Caspase-9的表达有关。
Authors and Affiliations
Hong-dan CAO
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