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2-��m membranes with minimal losses. No insoluble aggregates formed even after a year of storage at 4��C. Mixtures of Ac-sPPp and Doxil were prepared with the aim of potentiating http://www.selleckchem.com/products/dabrafenib-gsk2118436.html PDT with chemotherapy while only requiring a single-injection administration (see Fig.?1c). To make Ac-sPPp?+ Doxil mixtures, a stock solution of Ac-sPPp in PBS was thoroughly mixed with Doxil. Stability of mixtures after overnight incubation at 37��C was investigated by ultracentrifugation. Ac-sPPp did not incorporate into Doxil liposomes (no significant amount of Ac-sPPp was observed in the ultracentrifuged Doxil sediment layer), and Doxil liposomes remained intact with no leakage of doxorubicin (no significant amount of free doxorubicin was seen in supernatants). Studies were conducted to compare the in vitro phototoxicity and targeting specificity of various PS formulations. Representative in vitro phototoxicity data are provided in the Supplementary Materials (see Fig. S1). In general, PPa was found to be significantly more phototoxic than Ac-sPPp, and compared to anti-erbB Ac-sPPp http://www.selleckchem.com/products/sch772984.html PICs, PPa and Ac-sPPp exhibited no targeting specificity in vitro. Phototoxic killing of A-431/G4 cells was >95% for 150?nm PPa but was negligible for 150?nm Ac-sPPp, and >95% killing was only achieved with Ac-sPPp above ?500?nm (10?J?cm?2 light dose, 16- or 40-h incubations). By comparison, 150?nm PPa equivalents of anti-EGFR Ac-sPPp-cetuximab http://www.selleck.cn/products/z-vad-fmk.html PIC with 10?J?cm?2 light killed 84% and 89% of A-431/G4 cells for 16- and 40-h incubations, respectively, and phototoxic effects were inhibited to