Dual-Functional Nanographene Oxide as Cancer-Targeted Drug-Delivery System to Selectively Induce Cancer-Cell Apoptosis.

Construction of bioresponsive drug-delivery nanosystems could enhance the anticancer efficacy of anticancer agents and reduce their toxic side effects. Herein, by using transferrin (Tf) as a surface decorator, we constructed a cancer-targeted nanographene oxide (NGO) nanosystem for use in drug delivery. This nanosystem (Tf-NGO@HPIP) drastically enhanced the cellular uptake, retention, and anticancer efficacy of loaded drugs but showed much lower toxicity to normal cells. The nanosystem was internalized through receptor-mediated endocytosis and triggered pH-dependent drug release in acidic environments and in the presence of cellular enzymes. Moreover, Tf-NGO@HPIP effectively induced cancer-cell apoptosis through activation of superoxide-mediated p53 and MAPK pathways along with inactivation of ERK and AKT. Taken together, this study demonstrates a good strategy for the construction of bioresponsive NGO drug-delivery nanosystems and their use as efficient anticancer drug carriers.

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