经兔肝动脉灌注As2O3对肝移植瘤作用的实验研究

目的探讨经兔肝动脉灌注As2O3对肝移植瘤的抑制作用.方法采用不同浓度As2O3经肝动脉插管灌注治疗兔肝脏Vx-2移植瘤,连续7 d,观察肿瘤平均质量、平均瘤重抑制率、肿瘤细胞形态学变化,检测bcl-2/bax基因表达和VEGF表达.结果实验组的平均瘤重分别为7.99、6.50、4.87 g,平均瘤重抑制率分别为50.31%、59.58%和69.71%,实验组移植瘤瘤重低于阴性对照组(P＜0.05).随着As2O3的剂量增加,实验组的瘤重减轻而平均瘤重抑制率增加(P＜0.05).实验组内移植瘤组织bax基因表达显著上调,bcl-2基因表达、VEGF表达显著下调(P＜0.05).而bcl-2基因、VEGF表达下调无差异性(P=1.00).电镜观察实验组各组均有典型的瘤细胞凋亡形态学改变.结论经肝动脉灌注As2O3治疗兔Vx-2肝移植瘤,有显著的抗肿瘤作用,并具有剂量依赖特点.其诱导瘤细胞凋亡可能主要通过上调bax基因表达起作用.

Experimental study of arsenic trioxide on rabbits with hepatic Vx-2 carcinoma by transcatheter arterial infusion

Objective To evaluate the anticancer effect of arsenic trioxide (As 2O 3) on rabbits with hepatic Vx 2 carcinoma by transcatheter arterial infusion (TAI). Methods Rabbits with hepatic Vx 2 carcinoma were treated with As 2O 3 by TAI for 7 d consecutively. The tumor inhibitory rate and the average tumor weight were determined. The morphological changes of the tumor were observed with a transmission electron microscope. bax/bcl 2 and VEGF expressions were examined by immunohistochemistry. Results The average weight of the tumor was 7.99, 6.50, and 4.87 g, and the tumor growth inhibitory rates in the experimental groups were 50.31%, 59 58%, and 69 71%, respectively. Tumor growth was significantly inhibited as compared with that in the NS group ( P <0.05). The upregulated bax expression and downregulated bcl 2 expression were detected in As 2O 3 groups by immunohistochemistry. There was significant difference between the As 2O 3 groups and the control group ( P <0.05). Significantly decreased VEGF expression was also observed in As 2O 3 groups as compared with the controls ( P <0.05). Bcl 2 gene expression was consistent with VEGF expression. Transmission electron microscopy showed typical morphological characteristics of apoptosis of some tumor cells in the experimental groups. Conclusion As 2O 3 by TAI can inhibit rabbit hepatic Vx 2 carcinoma effectively in a dose dependent manner. Apoptosis induced by As 2O 3 may be closely related to the upregulated bax expression.