摘要:
Objective To study the multidrug resistance gene 1 (MDR1) promoter regulated cytosine deaminase and uracil phosphoribosyltransferase fusion gene (CD:UPRT) killing of esophageal cancer cells in nude mice EC9706 cells.Methods 0.2 ml EC9706 cells were inoculated subcutaneously in nude mice and esophageal cancer xenograft model to build and build pAdTrack-MDR1-CD:UPRT plasmids,were randomly divided into three groups of treated and observed 30 d,tumor volume was measured using the V =x × y2/2 (x long diameter,y for short diameter).Routine pathological examination of tumor tissue,immunohistochemical detection of CD protein.Results Successfully constructed subcutaneous xenograft model of esophageal cancer,treatment for 30 days,group B,group C rapid tumor growth,surface necrosis,tumor volume was (3.21 ±0.23) cm3,(3.15 ±0.22) cm3;A group of tumor growth restrained,the first 30 days volume (cm3),compared to the difference of (0.98 ±0.15) was statistically significant (P <0.05).A group of tumor cells arranged in a sparse,large areas of necrosis red dye,partially visible condensation nuclei,nuclear fragmentation;group B,group C tumor cells tightly packed,rich in blood vessels,cell morphology and cell nuclei were pleomorphic,and a large stained mitotic common.After immunohistochemical staining,A,group B tumor tissues were positive,indicating that the protein expression of CD,group C immunohistochemical staining of tumor tissue was negative.Conclusion MDR1 promoter regulated CD:UPRT/5-fluorocytosine (5-FC) fusion suicide gene system for esophageal carcinoma in nude mice xenograft significant cytotoxicity,gene therapy for esophageal cancer provides a possible approach.%目的 观察多药耐药基因1(MDR1)启动子调控的胞嘧啶脱氨酶和尿嘧啶磷酸核糖转移酶融合基因(CD:UPRT)在裸鼠体内对食管癌细胞EC9706细胞的杀伤作用.方法 0.2 ml EC9706细胞悬液接种裸鼠,构建食管癌皮下移植瘤模型及pAdTrack-MDR1-CD:UPRT质粒,模型随机分成3组经处理并观察30 d,测量肿瘤体积使用V=x×y2/2(x为长径,y为短径).肿瘤组织常规病理检查,免疫组织化学检测CD蛋白的表达.结果 成功构建食管癌皮下移植瘤模型,处理30 d后,B、C组肿瘤生长迅速,表面出现坏死,肿瘤体积分别为(3.21±0.23)、(3.15 ±0.22) cm3;A组肿瘤生长受到抑制,第30天体积为(0.98±0.15) cm3,差异有统计学意义(P<0.05).A组肿瘤细胞排列稀疏,大片坏死红染,部分可见胞核固缩、核碎裂;B、C组肿瘤细胞排列紧密,血管丰富,细胞形态及细胞核呈多形性,核大深染,核分裂像多见.经免疫组织化学染色后,A、B组肿瘤组织呈阳性反应,表明有CD蛋白的表达,C组肿瘤组织免疫组织化学染色呈阴性.结论 MDR1启动子调控的CD:UPRT/5-氟胞嘧啶(5-FC)融合自杀基因系统对裸鼠食管癌皮下移植瘤有显著的杀伤作用.