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Nanoscaled red blood cells facilitate breast cancer treatment by combining photothermal/photodynamic therapy and chemotherapy.
Biomaterials 2018 Februrary
Red blood cells (RBCs)-based vesicles have been widely used for drug delivery due to their unique advantages. Intact RBCs contain a large amount of oxyhemoglobin (oxyHb), which can assist with photodynamic therapy (PDT). Indocyanine green (ICG), a photosensitizer both for photothermal therapy (PTT) and PDT, shows potent anticancer efficacy when combined with chemotherapeutic drug doxorubicin (DOX). In this study, we prepared nanoscaled RBCs (RAs) containing oxyHb and gas-generating agent ammonium bicarbonate (ABC) for co-loading and controlled release of ICG and DOX, thus hoping to achieve synergistic effects of PTT/PDT and chemotherapy against breast cancer. Compared to free ICG, ICG and DOX co-loaded RAs (DIRAs) exhibited nearly identical PTT efficiency both in vitro and in vivo, but meanwhile their PDT efficiency was enhanced significantly. In mouse breast cancer cells, DIRAs significantly inhibited cell growth and induced cell apoptosis after laser irradiation. In breast tumor-bearing mice, intratumoral injection of DIRAs and followed by local laser irradiation almost completely ablated breast tumor and further suppressed tumor recurrence and metastasis. In conclusion, this biomimetic multifunctional nanosystem can facilitate breast cancer treatment by combining PTT/PDT and chemotherapy.
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