重组人p53腺病毒增强肝癌放疗敏感性的实验研究

目的 观察重组人p53腺病毒(recombinant human adenovinm p53,rAd-p53)联合放疗对肝癌裸鼠移植瘤生长的抑制作用.方法 人肝癌细胞SMMC-7721荷瘤裸鼠18只,应用随机数字表法选取2只,1只瘤内注射rAd-p53,另1只注射PBS,注射后48 h处死动物取瘤,Western blot方法检测肿瘤P53蛋白表达;其余16只分为4组:对照组、单独放疗(IR)组、重组人pS3腺病毒(rAd-p53)治疗组和重组人p53腺病毒+放疗(rAd-p53+IR)联合治疗组.实验治疗第16天处死动物,绘制肿瘤生长曲线;光镜下观察肿瘤治疗后组织形态学变化;免疫组化S-P法检测Ki-67,TUNEL法检测肿瘤细胞凋亡.结果 rAd-p53成功感染了肝癌裸鼠移植瘤细胞,并增强肝癌细胞P53蛋白的表达;rAd-p53+IR联合治疗组、IR组和rAd-p53治疗组的肿瘤生长抑制率分别为81.49%、30.74%和33.67%,其中rAd-p53+IR联合治疗组的肿瘤抑制最强(P<0.01).光镜下观察各治疗组的肿瘤组织均出现坏死,其中rAd-p53+IR联合治疗组肿瘤坏死较多;rAd-p53+IR联合治疗组肿瘤细胞表达Ki-67明显低于对照组、IR组和rAd-p53治疗组(P<0.01),而肿瘤细胞凋亡显著增加(P<0.01).结论 rAd-p53+IR联合治疗较单独放疗能显著抑制肝癌的生长,rAd-p53能增强肝癌对放疗敏感性.

Recombinant human adenovirus p53 enhances radiosensitivity of human hepato-carcinoma-bearing nude mice

Objective To explore the inhibitory effect of recombinant human adenovirus p53 (rAd-p53) combined with radiotherapy on human hepatocarcinoma in nude mouse model. MethodsNude mice hepatocarcinoma model was established by inoculating SMMC-7721 cells into the back of 18 nude mice. Firstly, two nude mice were taken out randomly, one was administered by intratumoral injection of rAd-p53, another was administered with PBS. After 48 h, the expression of P53 protein was detected by Western blotting. The rest 16 nud...