Abstract
BackgroundPhotodynamic therapy (PDT) utilizes the enhanced permeability retention effect of photosensitizers and is less invasive and more selective than traditional chemotherapy. We constructed a chemotherapeutic PDT (chemo-PDT) nanoscale drug delivery system using a liposomally formulated indocyanine green derivative (ICG-Lipo) that encapsulated carboplatin and docetaxel (ICG-Lipo-C&D). MethodsThe antitumor effect of chemo-PDT mediated by ICG-Lipo-C&D was evaluated in a murine colon 26 CDF1 mouse model. Gene expression in tumor tissues was analyzed by RNA sequencing. ResultsChemo-PDT using ICG-Lipo-C&D demonstrated an even stronger PDT-enhancing effect than did ICG-Lipo due to the synergistic effect of carboplatin and docetaxel. In addition, gene expression analysis showed that PDT with ICG-Lipo-C&D increased the expression of immune-related genes and decreased the expression of cytoskeleton-related genes. ConclusionsChemo-PDT using ICG-Lipo as a photosensitizer as well as a drug delivery system with an enhanced permeability retention effect may be a promising cancer therapy.
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