为了实现对肿瘤的靶向性药物/基因治疗,通过化学还原法制备了细胞穿膜肽Tat修饰的Au-Au2S纳米药物载体.采用透射电镜、表面增强拉曼光谱仪、紫外分光光度计对Tat/Au-Au2S纳米粒子进行表征,采用流式细胞仪、激光共聚焦显微镜研究Tat/Au-Au2S纳米粒子的穿细胞膜机制.理化分析结果表明,Tat可通过Au-S键接枝于Au-Au2S纳米粒子表面,直径约50nm的Tat/Au-Au2S纳米粒子具有近红外敏感性.细胞内化途径示踪物共定位分析和抑制剂阻断实验表明,Tat/Au-Au2S纳米粒子以脂筏介导的巨胞饮途径进入Hela细胞,而以受体和脂筏共介导的巨胞饮途径进人骨髓间充质干细胞(BMSCs).
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