Objective To explore whether superparamagnetic iron oxide nanoparticle (SPIO) will influence the anti-tumor immunity triggered by tumor lysate protein against human MCF-7 breast cancer cells ( MCF-7 ) in vitro. Methods SPIO was covalently conjugated with tumor lysate protein to form SPIO-protein complex. Human peripheral blood mononuclear cells ( PBMC) were stimulated by tumor lysate protein, SPIO, or SPIO-protein complex separately. The treated PBMC were mixed with MCF-7 cells and tumor inhibition was evaluated by MTS assay. Results The SPIO conjugated with 60% of tumor lysate protein and formed a larger nano-structure. Compared with tumor lysate protein, SPIO-protein complex significantly enhanced the anti-tumor response by PBMC, whereas SPIO alone produced no cytotoxicity against MCF-7 cells. Conclusions The SPIO-protein complex is capable of enhancing the anti-cancer immune reaction against MCF-7 cancer cells by PBMC in vitro.%目的 探索顺磁性氧化铁纳米颗粒是否能调节由肿瘤裂解蛋白所诱发的针对人乳腺癌细胞(MCF-7)的抗肿瘤免疫反应.方法 将纳米铁颗粒与肿瘤裂解蛋白进行共价连接形成纳米铁-蛋白复合物,用裂解蛋白、纳米铁、纳米铁-蛋白复合物分别刺激人外周血单个核细胞(PBMC),再将刺激后的PBMC与MCF-7细胞相混合,用MTS方法检测对肿瘤细胞的杀伤率.结果 纳米铁能与60％的肿瘤裂解蛋白相连接,并形成较大的纳米颗粒.与单纯的肿瘤蛋白相比,纳米铁-肿瘤蛋白的复合物能够显著提升PBMC对MCF-7细胞的杀伤,而纳米铁本身对MCF-7无直接杀伤作用.结论 纳米铁-肿瘤蛋白的复合物能够显著增强PBMC在体外杀伤人乳腺癌细胞的能力.
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