Bcl-XL反义寡核苷酸转染对食管癌细胞增殖及裸鼠体内人食管癌移植瘤生长的抑制作用

目的探讨Bcl-XL反义寡核苷酸转染后,对食管癌细胞增殖及裸鼠体内人食管癌移植瘤生长的影响。方法采用阳离子脂质体介导的反义寡核苷酸转染、逆转录聚合酶链反应(RT-PCR)、Western蛋白印迹杂交、四甲基偶氮唑盐光吸收法(MTT法)、流式细胞术及凋亡的原位末端标记(TUNEL)检测等方法观察了Bcl-XL反义寡核苷酸转染对食管癌细胞增殖、凋亡的影响及裸鼠体内人食管癌移植瘤生长的影响。结果MTT法检测显示,Bcl-XL反义寡核苷酸可显著抑制食管癌细胞的增殖(P<0.05);对Bcl-XLmRNA表达抑制率为57.3%,可显著下调Bcl-XL的蛋白表达;应用流式细胞术和TUNEL检测技术,反义寡核苷酸组的凋亡率分别为(31.1±5.8)%和35.0%,与相关对照组比较差异有统计学意义(P<0.01)。反义寡核苷酸组裸鼠体内人食管癌移植瘤的生长受到显著抑制(P<0.05)。Bcl-XLmRNA及蛋白表达亦受到明显抑制,并且移植瘤组织中凋亡细胞明显增加。结论Bcl-XL反义寡核苷酸可有效抑制食管癌细胞增殖及裸鼠体内人食管癌移植瘤的生长。通过反义寡核苷酸下调Bcl-XL的表达,达到治疗食管癌的目的,为食管癌的基因治疗提供实验依据。

Inhibitory effects of transfected Bcl-XL antisense oligodeoxynucleotide on proliferation of esophageal cancer cells and growth of human esophageal carcinoma in nude mice

OBJECTIVE: To investigate the biologic effects of Bcl-XL antisense oligodeoxynucleotide (ASODN) transfected into cultured esophageal carcinoma cells and human esophageal carcinoma xenograft in nude mice. METHODS: Cationic liposome-mediated ASODN was used to transfect esophageal carcinoma cells. RT-PCR, Western blot, MTT assay, flow cytometry and in-situ apoptosis cells detection (TUNEL detection) were used to systematically study the biological effects of the transfected cells in vitro and in vivo. RESULTS: MTT assay showed that the proliferation of esophageal carcinoma cells in the ASODN group decreased significantly as compared with control (P < 0.05), along with a 57.3% inhibitory rate of Bcl-XL mRNA, a significant decrease of Bcl-XL protein and the apoptosis rates of (31.1 +/- 5.8)% and 35.0% by flow cytometry and TUNEL assay, respectively (P < 0.01, as compared with controls). The growth of human esophageal carcinoma in nude mice was also significantly inhibited in the ASODN group (P < 0.05), along with a significant decrease of Bcl-XL mRNA and protein expression, and also an enhanced apoptosis of the tumor cells in nude mice. CONCLUSIONS: Bcl-XL ASODN can effectively inhibit the proliferation of esophageal carcinoma cells in vitro and the growth of the tumor in vivo. The suppression of Bcl-XL expression by ASODN may offer both a therapeutic approach and an important theoretic foundation for gene therapy against esophageal carcinoma.