Multi-functional Albumin Based Delivery System Generated by Programmed Assembly for Tumor Targeted Multimodal Therapy and Imaging.

To enhance the treatment efficiency in tumor therapy, we developed a tumor targeting protein based delivery system, DOX&ICG@BSA-KALA/Apt, to efficiently integrate multimodal therapy with tumor imaging and realize synchronous PDT/PTT/chemotherapeutic functions. In the delivery system, a chemotherapeutic drug (doxorubicin, DOX) and an optotheranostic agent (indocyanine green, ICG) were co-loaded in bovine serum albumin (BSA) via hydrophobic interaction induced self-assembly to form stable DOX&ICG@BSA nanoparticles. After decoration of a surface layer composed of a tumor targeting aptamer AS1411 and a cell penetrating peptide KALA, the obtained DOX&ICG@BSA-KALA/Apt nanoparticles exhibit significantly improved multimodal cancer therapeutic efficiency due to the enhanced cancer cellular uptake mediated by AS1411 and KALA. In vitro and in vivo studies show the multimodal theranostic system can efficiently inhibit tumor growth. In addition, the near-infrared fluorescent/photothermal dual-mode imaging enables accurate visualization of the therapeutic action in tumor sites. This study provides a facile strategy to construct self-assembled multimodal theranostic systems, and the functional protein based theranostic system prepared holds great promise in multimodal cancer diagnostics and therapeutics.

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