抗人肝癌免疫毫微球的制备及其抗癌效果观察

目的 制备抗人肝癌免疫毫微球,观察其活性及抗癌效果.方法 抗人肝癌单克隆抗体HAb18通过异型双功能交联剂SPDP与载阿霉素(ADR)人血清白蛋白毫微球HSA(ADR)-NS]偶联,制成抗人肝癌免疫毫微球HAb18-HSA(ADR)-NS,使用凝集试验及免疫荧光检测其活性,光镜和电镜下观察其与人肝癌细胞株SMMC-7721特异性结合.MTT法检测该免疫毫微球的体外杀伤性.于人肝癌裸鼠模型上分别使用HAbl8-HSA(ADM)-NS、HSA(ADM)-NS及ADM,检测3者的肿瘤抑制率.结果 HAb18-HSA(ADM)-NS具有单抗活性,能与肝癌细胞特异结合;其体外杀伤SMMC-7721细胞IC50值为44.6μg/ml,与HSA(ADM)-NS(345.5μg/ml)及ADM(365.5μg/ml)相比,明显降低;体内肿瘤抑制率比HSA(ADM)-NS及ADM明显增强(P＜0.001).结论 HAb18-HSA(ADM)-NS具有免疫活性,对肝癌细胞有主动靶向性,体内外均具有比HSA(ADM)-NS及ADM更强的抗癌效果.

Antitumor effect of nanospheres coupled with the anti-human liver cancer monoclonal antibody HAb18

OBJECTIVE: To prepare nanospheres coupled with the anti-human liver cancer monoclonal antibody HAb18 and evaluate its immunoreactivity and antitumor effects. METHODS: The nanosphere coupled with the antibody was prepared by intermolecular cross-linking the anti-human liver cancer monoclonal antibody, HAb18, with human serum albumin nanospheres containing ADM termed HAS(ADM)-NS] via a new hetero-bifunctional cross-linker SPDP. Condensation test and immunofluorescence assay were used to evaluate the immunoreactivity of the nanospheres, and specific binding of HAb18-HAS(ADM)-NS with liver cancer cell line SMMC-7721 was observed with optical and electron microscopes. The specific cytotoxic effects on the target cells were evaluated in vitro by MTT assay. HAb18-HAS(ADM)-NS, HAS(ADM)-NS and ADM were injected separately into nude mice bearing human liver carcinoma to evaluate the inhibitory activity of HAb18-HAS(ADM)-NS in vivo. RESULTS: The immunoreactivity of HAb18-HAS(ADM)-NS was well preserved. HAb18-HAS(ADM)-NS could bind specifically with the SMMC-7721 cells. The IC(50) of HAb18-HAS(ADM)-NS against SMMC-7721 cells was 44.6 microg/ml, lower than that of HAS(ADM)-NS (345.5 microg/ml) and ADM (365.5 microg/ml). The inhibition rate of HAb18-HAS(ADM)-NS on the growth of liver cancer xenografts was significantly higher than that of HAS(ADM)-NS and ADM (P<0.001). CONCLUSION: HAb18-HAS(ADM)-NS has immunoreactivity and can actively and specifically target the liver cancer cells. The antitumor activity of HAb18-HAS(ADM)-NS is significantly higher than that of HAS(ADM)-NS and ADM.