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Gold nanocages (Au NCs), as drug carriers, have been widely applied for cancer diagnosis and photothermal therapy (PTT). Transmembrane transporting efficacy of Au NCs is the fundamental and important issue for their use in PTT. Herein, we used a force tracing technique based on atomic force microscopy to track the dynamic transmembrane process of Au NCs at the single-particle level in real time. Meanwhile, we measured and compared the dynamic parameters of Au NCs with sizes of 50 and 100 nm usually used as nanodrug carriers of PTT. It is concluded that the 50 nm Au NC transmembrane transporting needs smaller force and shorter duration with a much faster speed. However, both the 50 and 100 nm Au NC transmembrane transporting depends on the caveolin-mediated endocytosis, clathrin-mediated endocytosis, and macropinocytosis, which was also confirmed by confocal fluorescence imaging. This report will provide a potential technique for screening nanodrug carriers from the perspective of transmembrane transporting efficacy.

Size-Dependent Transmembrane Transport of Gold Nanocages