机构地区:[1]苏州大学附属第二医院放射科,215004 [2]苏州大学附属第二医院核医学科,215004
出 处:《中华核医学杂志》2008年第1期24-27,共4页Chinese Journal of Nuclear Medicine
基 金:国家自然科学基金(30400111);江苏省自然科学基金(BK2004041)
摘 要:目的研究^131I标记B细胞淋巴瘤Fab抗体^131I-Fab抗体)在荷人B细胞淋巴瘤裸鼠体内的分布和放射免疫显像效果。方法应用免疫组织化学和流式细胞仪检测经噬菌体抗体库技术获得的B细胞淋巴瘤Fab抗体的免疫活性。以Iodogen法对Fab抗体和CD20单克隆抗体(简称单抗,对照)进行^131I标记。标记物经尾静脉注入荷瘤裸鼠后2,4,8和24h分别进行显像,并测定荷瘤裸鼠体内主要组织的放射性分布。结果免疫组织化学和流式细胞仪检测结果表明Fab抗体和^131I-Fab抗体均能与Raji细胞膜抗原结合,结合率〉87%。显像结果显示^131I-Fab抗体在注入荷瘤裸鼠体内8h即可使肿瘤清晰显影,24h基本被清除.^131I—CD20单抗注入后24h肿瘤可见放射性浓聚。荷瘤裸鼠体内分布结果表明在2,4和8h^131I-Fab抗体组肿瘤每克组织百分注射剂量率(%ID/g)分别为(1.37±0.28),(1.84±0.13)和(2.21±O.15)%ID/g,均高于对照组[分别为(0.33±0.06),(0.62±0.08)和(1.46±0.z4)%ID/g;F=52.22,278.42和29.00,P均〈0.05],24h则明显低于对照组[分别为(0.44±O.ar7)和(3.56±0.66)%ID/g;F=89.7,P〈0.05]。2,4,8,24h ^131I-Fab抗体组肿瘤/非肿瘤组织放射性(T/NT)比值分别为(0.22±0.03)~(5.44±0.31),(0.43±0.11)~(21.01±3.97),(1.09±0.07)~(20.28±2.77),(1.12±0.02)~(10.29±1.78);而对照组T/NT比值分别为(0.04±0.01)~(3.10±0.29),(0.11±0.05)~(7.99±1.81),(0.48±0.06)~(23.55±1.69),(2.32±0.34)~(33.23±6.83)。结论^131I-Fab抗体具有相对分子质量小、活体定位准确高效、显像早和清除快速等优点,对临床放射免疫显像诊断B细胞淋巴瘤具有潜在的应用价值。Objective Radioimmunoimaging is still an interesting study in the domain of nuclear medicine. The aim of this study was to evaluate the biodistribution and radioimmunoimaging of ^131I-Fab antibody in nude mice bearing human B cell lymphoma. Methods The immunoreactivity of Fab antibody to Raji cells was analyzed by immunohistechemistry and flow cytometry. Fab antibody and CD20 moneclonal antibody (as control) were labeled with ^131I using Iodogen method. ^131I-Fab antibody or ^131I-CD20 was injected into nude mice bearing B cell lymphoma via tail veins. The biedistribution and radioimmunoimaging results were obtained at 2, 4, 8 and 24 h postinjection, respectively. Results The results of immunohistochemistry and flow cytometry indicated that both Fab antibody and ^131I-Fab antibody could bind strongly with membrane antigem on Raji cells, and the binding rate reached above 87%. Clear tumor image was obtained at 8 h after injection with ^131I-Fab and elimination was observed at 24 h postinjection. The clear tumor image for ^131I-CD20 antibody was obtained at 24 h post injection. The biodistribution in vivo showed that the percentage activities of injection dose per gram of tumor (%ID/g) of ^131I-Fab group at 2, 4, 8 h postinjection were higher than that of 1311-CD20 antibody [ ( 1.37 ± 0.28 ), ( 1.84 ± 0. 13 ), (2:21 ± 0.15 ) % ID/g vs (0.33 ± 0.06 ), (0. 62 ± 0.08), ( 1.46 ±0.24) % ID/g, respectively; F = 52.22, 278.42 and 29.00, all P 〈 0. 05 1, but lower at24 h [(0.44±0.07) %ID/g vs (3.56 ±0.66) %ID/g; F=89. 7, P〈0.051. The tumor/nontumor (T/NT) ratios for ^131I-Fad and ^131I-CD20 groups at 2, 4, 8 and 24 h were [ (0.22 ± 0.03) - (5.44 ± 0.31)] vs[ (0.04±0.01) -(3.10±0.29)1, [(0.43±0.11) -(21.01 ±3.97)] vs [(0.11 ±0.05) - (7.99±1.81)1, [(1.09±0.07) -(20.28±2.77)] vs [(0.48±0.06) -(23.55±1.69)1, [(1.12± 0. 02) - ( 10.29 ± 1.78) 1 vs [ (2.32 ± 0.34) - (33.23±6.83 ) 1, respectivel
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