^(131)I-抗肺癌McAb在人肺癌裸鼠模型体内的放射免疫显像

Radioimmunoimaging of Nude Mice Bearing Human Lung Adenocarcinoma Xenografts After Injecting 131!-McAbs

用氯胺T法将^(131)I标记抗人肺癌McAb(LC86a-C_5、LC86a-H_8)和正常BALB/c小鼠IgG分别腹腔注入人肺腺癌细胞株LTEP-a-2裸鼠模型体内,并定时γ照像。结果72h后,注射^(131)I-McAbs裸鼠肿瘤组织呈现清晰图像,与正常组织差别明显;而注射^(131)I-IgG裸鼠肿瘤组织与正常组织则无明显区别。96h后,注射^(131)I-McAb(LC86a-C_5)、^(131)I-McAb(LC86a-H_8)及^(131)I-IgG裸鼠的瘤血放射比值分别为3.1、2.8和0.9。提示肿瘤生长部位的清晰图像是^(131)I-McAb与肿瘤组织特异性结合的结果,进一步证实该标记McAb在体内外有较高的特异性及亲合力,可为临床肿瘤定位诊断及导向杀伤研究提供有效的手段。

Monoclonal antibodies (Lc86a-C5, Lc86a-H8) directed against human lung adenocarcinoma cell line LTEP-a-2 and normal BALB/c IgG were labelled with iodine-131 by chloramine T. The 131I-McAbs and 131I-IgG were respectively injected into the peritoneal cavities of nude mice bearing transplanted human lung adenocarcinoma cell line LTEP-a-2. After 72 h, the tumor tissue in nude mice injected with 131I-McAbs was distinguishable from normad tissues as a very clear image obtained during gamma scintigraphy. No difference was found between tumor and normal tissues in the nude mice injected with 131I-IgG, The tumon: blood ratio was 3.1:l in nude mice injected with 131I-McAb(H8) and 0.9 : 1 in nude mice injected with 131I-IgG respectively.This indicates that the tumor tissue image was the result of spacific binding of the 131I-McAbs, which have high specificity and affinity both in vitro and in vivo, to tumor cells, and these monoclonal antibodies may serve as potential agents in tumor diagnosis and treatment.