【摘要】 目的:探讨含胞嘧啶-磷酸盐-鸟嘌呤基序的寡脱氧核苷酸(cytosine-phosphate-guanine oligodeoxynucleotide,CpG ODN)对X线照射荷瘤小鼠Lewis肺癌的放疗增敏作用。方法:在小鼠右前腋窝接种Lewis肺癌细胞,制备荷瘤小鼠模型,将32只荷瘤小鼠随机分为4组:对照组,无任何处理;X线照射组,3 Gy/次,第1、3、5、8、10、12天照射,总剂量18Gy;CpG组,第1、3、5、8、10、12天注射,每次腹腔注射CpG ODN 0.05 mg;D组:CpG+X线照射组,每次X线照射前6 h腹腔注射CpG ODN观察各组移植瘤生长速度和各治疗组移植瘤生长延迟时间,H-E染色法观察移植瘤组织病理变化,TUNEL法检测细胞凋亡结果:成功建立荷Lewis肺癌小鼠模型,经治疗后各组小鼠移植瘤体积都较对照组明显减小(P<0.01),CpG+X线照射组移植瘤体积最小;X线照射组移植瘤的生长延迟时间为2.1 d,CpG组为2.3 d,CpG+X线照射组为4.8 d,CpG ODN的放射增敏比为2.09。H-E染色病理观察到各治疗组都较对照组移植瘤坏死明显,CpG+X线照射组最显著TUNEL法检测对照组瘤组织细胞凋亡率为(2.75±0.89)%,X线照射组为(4.87±1.13)%,CpG组为(7.63±1.41)%,CpG+X线照射组为(32.63±4.66)%;各治疗组都明显高于对照组,CpG+X线照射组显著高于X线放射组和CpG组(P<0.01)。结论:CpG OND能明显提高Lewis肺癌移植瘤对X线的放射敏感性,促进肿瘤细胞凋亡。更多还原

【Abstract】 Objective: To explore the role of cytosine-phosphate-guanine oligodeoxynucleotide(CpG ODN)in enhan- cing the radiosensitivity to X-ray in mouse with Lewis lung cancer.Methods: The tumor-bearing mouse model was in- duced by injevting Lewis lung cancer cells into the right infra-axillary dermis.Thirty-two C57BL/6J mice were evenly ran- domized into 4 groups.Group A: the control group;Group B: the X-Ray radiation group;Group C: the CpG group; Group D: the CpG plus X-Ray radiation group.Group B was treated with X-Ray radiation only(3 Gy/F,on day 1,3,5, 8,10,and 12;the total dose was 18 Gy);group C was administered with CpG ODN 0.05 mg on day 1,3,5,8,10, and 12;group D was administered with CpG ODN 6h before X-ray radiation.The tumor growth and tumor growth delay (TGD)were observed in all groups.Meanwhile,the pathological change of the tumor tissue was observed with H-E staining method and the apoptosis of tumor cells were examined with the method of TUNEL.Results: The Lewis hmg cancer-bearing model was successfolly established in mice.The tumor volumes of the treatment groups were smaller than that in lhe control group(P<0.01),and the tumor volume of group D was the smallest.The tumor growth delays were 2.1 d in group B,2.3 d in group C,and 4.8 d in group D.The sensitization enhancement ratio of CpG ODN was 2.09. H-E staining showed that tumor necrosis in group B,C and D was more severe than that of control group,with the most se- vere one found in group D.TUNEL results revealed that the apoptosis rate were(2.75±0.89)% in group A,(4.87±1.13)% in group B,(7.63±1.41)% in group C,and(32.63±4.66)% in group D;the apnptosis rate of every therapy group was higher than that in the control group,and that of the group D significantly higher than those of group B and C(P<0.01).Conclusion: CpG ODN can dramatically increase the radiosensitivity of tumor cells and promntetheir apoptosis.更多还原