【摘要】 背景与目的肿瘤生长抑制因子4(inhibitor of growth 4,ING4)基因是一种重要的肿瘤抑制因子,研究发现ING4基因对多种肿瘤细胞具有抑癌作用。本研究旨在探讨ING4基因对人肺腺癌裸鼠移植瘤的生长抑制作用及其潜在的作用机制。方法采用SPC-A1细胞株建立肺腺癌裸鼠移植瘤模型,15只荷瘤裸鼠随机等分为PBS组、腺病毒组(Ad-GFP组)、腺病毒介导的ING4组(Ad-ING4组),上述各组进行局部干预用药,动态测量肿瘤体积,治疗结束后摘取瘤体称重并计算瘤重抑瘤率;脱氧核糖核苷酸末端转移酶介导的缺口末端标记(TUNEL)法检测瘤体内细胞凋亡情况,免疫组织化学SP法检测天冬氨酸特异性半胱氨酸蛋白酶-3(Caspase-3)、环氧化酶-2(COX-2)、Fas与FasL的表达。结果 Ad-ING4组的肿瘤体积、瘤重均呈现明显下降,与Ad-GFP组抑瘤率(1.31%±0.31%)比较,差异有统计学意义(P<0.05),其抑瘤率为(33.17%±5.24%);Ad-ING4组的凋亡指数为(69.23%±6.53%),与PBS组(17.04%±1.10%)、Ad-GFP组(18.81%±1.93%)比较,差异有统计学意义(P<0.05)。SP法检测结果显示,Ad-ING4可明显上调Caspase-3、Fas与FasL表达,下调COX-2表达。结论 ING4具有抑制肺腺癌裸鼠移植瘤的生长抑制作用,该作用机制可能与诱导肿瘤细胞凋亡有关。更多还原

【Abstract】 Background and objective The inhibitor of growth 4(ING4) is an important tumor suppressive gene. It has been proven that ING4 could inhibite the proliferation of many tumors. The aim of this study is to investigate the inhibitory effect and anti-cancer mechanism of adenovirus-mediated ING4 gene on SPC-A1 human lung adenocarcinoma in nude mice. Methods A human lung adenocarcinoma xenograft model was established with SPC-A1 cells in nude mice. A total of 15 tumor-bearing nude mice were randomly divided into three groups, namely, PBS, Ad-GFP, and Ad-ING4. The mice in the three groups were intratumorally injected every other day. Their tumor volumes were continually recorded. The treatment tumors were then removed from the mice and weighed. Tumor inhibition rates were calculated. Cell apoptosis was examined by TUNEL method. Caspase-3, COX-2, Fas, and FasL expressions were investigated by immunohistochemistry SP assay. Results Both tumor weight and volume in the Ad-ING4 group were significantly decreased. The tumor inhibition rate of the mice in the Ad-ING4 group(33.17%±5.24%) was statistically different from that of the mice in the Ad-GFP group(1.31%±0.31%; P<0.05). The apoptotic index of the mice in the Ad-ING4 group(69.23%±6.53%) was also significantly different from those in PBS(17.04%±1.10%) and Ad-GFP groups(18.81%±1.93%; P<0.05). Based on immunohistochemistry SP assay, the results showed that Ad-ING4 may not only upregulate the expressions of caspase-3, Fas, and FasL but also downregulate the expression of COX-2. Conclusion ING4 gene elicited a remarkable growth inhibitory effect on human lung adenocarcinoma xeno-grafts in nude mice. The mechanism is possibly related to an increase in tumor cell apoptosis.更多还原