脂质体转染CD基因联合放射线对人直肠癌荷瘤裸鼠体内抗癌作用的研究

目的　探讨脂质体反复转染CD基因联合放射线对人直肠癌细胞荷瘤鼠体内的抗癌效果 ,为临床治疗直肠癌提供理论依据。方法　构建PXJ4 1/CD载体并进行测序证实 ,制备人直肠癌细胞荷瘤鼠 ,待瘤体长至长径达 0 5cm后 ,设实验组应用脂质体于治疗的当日及第 4、8、12天反复转染 ,于当日起 2Gy/day连续照射患肢 15d ,第 3天起 5 FC 80 0mg/kg/day腹腔注射共 12d ,另设单纯放射组、单纯CD/ 5 FC治疗组、空白对照组 ,观察荷瘤裸鼠的肿瘤生长曲线 ,瘤体积抑制率和瘤重抑制率。结果　荷瘤裸鼠肿瘤生长曲线显示 :实验组肿瘤生长曲线平缓 ,治疗效果显著 ,瘤体积抑制率平均为 81 5 % ,瘤重抑制率平均为 78 7% ,与其它 3组比较差异有显著性意义 (χ2 =2 87 86 ,P <0 0 1)。病理学检查示肿瘤细胞较对照组明显减少。结论　脂质体反复转染CD基因联合放射线治疗直肠癌荷瘤鼠 ,二者可产生协同作用 ,比单纯放疗或单纯CD/ 5 FC有更显著的抗癌疗效

Effects of liposome-mediated CD gene transfer plus radiation on human rectal cancer HR-8348 cells in nude mouse

ObjectiveTo investigate the effect of repeated transfer of liposome mediated CD gene plus radiation on the growth of human rectal cancer cells xenograft in nude mouse Methods HR 8348 cells transfered with liposome mediated CD gene repeatedly (at day 0,4,8,12 ) and treated with fractionated radiation at a dosage of 2 Gy/day to a total dose of 30 Gy. At the same time, mice were injected i.p.with 800 mg/kg/day of 5 FC for 12 days. Results Compared with controls tumors in treatment group grew with an inhibition rate of 78 7% in weight, and 81 5% in volume. ConclusionRepeated transfer of liposome mediated CD gene working together with radiation effect a significant inhibition on the growth of xenografted human rectal carcinoma HR 8348 cells in nude mouse.