AIM： To evaluate the multi-step pretargeting radioimmunoimaging （RII） and radioimmunotherapy （RTT） in nude mice bearing human colon carcinoma with avidin-biotin system labeled with 153^Sm. METHODS： Two- and thre...AIM： To evaluate the multi-step pretargeting radioimmunoimaging （RII） and radioimmunotherapy （RTT） in nude mice bearing human colon carcinoma with avidin-biotin system labeled with 153^Sm. METHODS： Two- and three-step strategies for avidinbiotin system pretargeting techniques were established. In a three-step procedure, human colon carcinoma bearing nude mice were first injected with biotinylated monoclonal antibody （McAb-Bt） followed by cold avidin （Av） 48 h later and then 153^Sm-DB2 24 h thereafter; whereas the twostep procedure consisted of injection of 153^Sm-SA 48 h after pretargeting with biotinylated anti-CEA monoclonal antibody （CEA McAb-Bt）. SPECT imaging and biodistribution were performed at 4, 24, 48, or 72 h after injection of 153^Sm-labeled compounds. Five groups of nude mice subcutaneously grafted with human colon carcinoma were treated 3 d after grafting. One group received the injection with 100 μg CEA McAb-Bt followed by cold avidin （80 μg） after 2 d and 11.1 MBCl I53Sm-DB2 after 1 d. Four control groups were treated respectively with 11.1 MBq 153^Sm- CEA McAb, ii.i MBq 153^Sm-nmIgG, ii.i MBq 153^Sm-DB2, 100 μL normal saline. Toxicity was evaluated by changes of leukocyte count, and the efficacy by variation in tumor volume. Histological analyses of tumors were performed. RESULTS： The three-step procedure allowed faster blood clearance and yielded higher tumor blood ratios （5.76 at 4 h and 12.94 at 24 h） of the 153^Sm-DB2. The tumor was clearly visualized at 4 h in y-imaging after the injection of 153^Sm-DB2, while a significant accumulation of 153^Sm-SA in the tumor was observed only 24 h after the injection and tumor blood ratios at 4 and 24 h were 1.00 and 2.03, respectively, in the two-step procedure. Pretargeting RIT and 153^Sm-CEA McAb had a strong tumor-inhibiting effect.The tumor inhibitory rate was 80.67% and 78.44%, respectively, five weeks after therapy. Histopathological evidence also indicated radioactive damage in tumor tissues as necrosis of tumor cells, while in the other organs such as liver and kidney no radioactive damage was observed. Leukocyte counts showed significant decrease after treatment in groups of 153^Sm-CEA McAb and 153^Sm- nmIgG. CONCLUSION： The two kinds of pretargeting strategies can elevate the target-to-nontarget ratio, decrease the blood background and shorten the imaging time compared to 153^Sm-CEA McAb. Three-step pretargeting RIT is as effident as 153^Sm-CEA McAb, but markedly less toxic. This study provides experimental evidence for the clinical application of pretargeting RII and RIT.展开更多
作者在传统的 PAP 及 ABC 染色方法的基础上,通过重复使用桥抗及 PAP 的次数或重复使用生物素化桥抗及 PAP 和 ABC 的次数,使 PAP 与 ABC 方法成功地结合,增加连接于抗原部位的酶分子数,建立起两种敏感的免疫细胞化学方法。染色结果经...作者在传统的 PAP 及 ABC 染色方法的基础上,通过重复使用桥抗及 PAP 的次数或重复使用生物素化桥抗及 PAP 和 ABC 的次数,使 PAP 与 ABC 方法成功地结合,增加连接于抗原部位的酶分子数,建立起两种敏感的免疫细胞化学方法。染色结果经显微分光光度图象分析,方差分析,回归分析及染色效果的直接观察表明,重复染色可增加阳性强度,扩大阳性染色范围,提高信噪比,从而提高方法的敏感性,以生物素化桥抗取代非生物素化桥抗,将 ABC 引入到多重 PAP 方法中,可使方法的敏感性进一步提高。该方法结合单克隆抗体及多克隆抗体成功地检测出用传统双PAP 及 ABC 难以或不能检测出的常规福尔马林固定石蜡包埋的肾综合征出血热尸检组织中的病毒抗原及石蜡包埋肿瘤活检组织中的桥粒抗原。展开更多
文摘AIM： To evaluate the multi-step pretargeting radioimmunoimaging （RII） and radioimmunotherapy （RTT） in nude mice bearing human colon carcinoma with avidin-biotin system labeled with 153^Sm. METHODS： Two- and three-step strategies for avidinbiotin system pretargeting techniques were established. In a three-step procedure, human colon carcinoma bearing nude mice were first injected with biotinylated monoclonal antibody （McAb-Bt） followed by cold avidin （Av） 48 h later and then 153^Sm-DB2 24 h thereafter; whereas the twostep procedure consisted of injection of 153^Sm-SA 48 h after pretargeting with biotinylated anti-CEA monoclonal antibody （CEA McAb-Bt）. SPECT imaging and biodistribution were performed at 4, 24, 48, or 72 h after injection of 153^Sm-labeled compounds. Five groups of nude mice subcutaneously grafted with human colon carcinoma were treated 3 d after grafting. One group received the injection with 100 μg CEA McAb-Bt followed by cold avidin （80 μg） after 2 d and 11.1 MBCl I53Sm-DB2 after 1 d. Four control groups were treated respectively with 11.1 MBq 153^Sm- CEA McAb, ii.i MBq 153^Sm-nmIgG, ii.i MBq 153^Sm-DB2, 100 μL normal saline. Toxicity was evaluated by changes of leukocyte count, and the efficacy by variation in tumor volume. Histological analyses of tumors were performed. RESULTS： The three-step procedure allowed faster blood clearance and yielded higher tumor blood ratios （5.76 at 4 h and 12.94 at 24 h） of the 153^Sm-DB2. The tumor was clearly visualized at 4 h in y-imaging after the injection of 153^Sm-DB2, while a significant accumulation of 153^Sm-SA in the tumor was observed only 24 h after the injection and tumor blood ratios at 4 and 24 h were 1.00 and 2.03, respectively, in the two-step procedure. Pretargeting RIT and 153^Sm-CEA McAb had a strong tumor-inhibiting effect.The tumor inhibitory rate was 80.67% and 78.44%, respectively, five weeks after therapy. Histopathological evidence also indicated radioactive damage in tumor tissues as necrosis of tumor cells, while in the other organs such as liver and kidney no radioactive damage was observed. Leukocyte counts showed significant decrease after treatment in groups of 153^Sm-CEA McAb and 153^Sm- nmIgG. CONCLUSION： The two kinds of pretargeting strategies can elevate the target-to-nontarget ratio, decrease the blood background and shorten the imaging time compared to 153^Sm-CEA McAb. Three-step pretargeting RIT is as effident as 153^Sm-CEA McAb, but markedly less toxic. This study provides experimental evidence for the clinical application of pretargeting RII and RIT.
文摘作者在传统的 PAP 及 ABC 染色方法的基础上,通过重复使用桥抗及 PAP 的次数或重复使用生物素化桥抗及 PAP 和 ABC 的次数,使 PAP 与 ABC 方法成功地结合,增加连接于抗原部位的酶分子数,建立起两种敏感的免疫细胞化学方法。染色结果经显微分光光度图象分析,方差分析,回归分析及染色效果的直接观察表明,重复染色可增加阳性强度,扩大阳性染色范围,提高信噪比,从而提高方法的敏感性,以生物素化桥抗取代非生物素化桥抗,将 ABC 引入到多重 PAP 方法中,可使方法的敏感性进一步提高。该方法结合单克隆抗体及多克隆抗体成功地检测出用传统双PAP 及 ABC 难以或不能检测出的常规福尔马林固定石蜡包埋的肾综合征出血热尸检组织中的病毒抗原及石蜡包埋肿瘤活检组织中的桥粒抗原。
