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• W2151472014 abstract "Arsenic trioxide (As(2)O(3)) is a frontline drug for treatment of acute promyelocytic leukemia and is in clinical trials for treatment of other malignancies, including multiple myeloma; however, efforts to expand clinical utility to solid tumors have been limited by toxicity. Nanoparticulate forms of As(2)O(3) encapsulated in 100-nm-scale, folate-targeted liposomes have been developed to lower systematic toxicity and provide a platform for targeting this agent. The resultant arsenic nanobins are stable under physiologic conditions but undergo triggered drug release when the pH is lowered to endosomal/lysosomal levels. Cellular uptake and antitumor efficacy of these arsenic liposomes have been evaluated in folate receptor (FR)-positive human nasopharyngeal (KB) and cervix (HeLa) cells, as well as FR-negative human breast (MCF-7) tumor cells through confocal microscopy, inductively coupled plasma mass spectroscopy, and cytotoxicity studies. Uptake of folate-targeted liposomal arsenic by KB cells was three to six times higher than that of free As(2)O(3) or nontargeted liposomal arsenic; the enhanced uptake occurs through folate-mediated endocytosis, leading to a 28-fold increase in cytotoxicity. In contrast, tumor cells with lower FR density on the surface (HeLa and MCF-7) showed much less uptake of the folate-targeted drug and lower efficacy. In cocultures of KB and MCF-7 cells, the folate-targeted arsenic liposomes were exclusively internalized by KB cells, showing high targeting specificity. Our studies further indicate that folate-targeted delivery of As(2)O(3) with coencapsulated nickel(II) ions (as a nontoxic adjuvant) potentiates the As(2)O(3) efficacy in relatively insensitive solid tumor-derived cells and holds the promise of improving drug therapeutic index." @default.
• W2151472014 created "2016-06-24" @default.
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• W2151472014 date "2009-07-01" @default.
• W2151472014 modified "2023-10-18" @default.
• W2151472014 title "Folate-mediated intracellular drug delivery increases the anticancer efficacy of nanoparticulate formulation of arsenic trioxide" @default.
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• W2151472014 doi "https://doi.org/10.1158/1535-7163.mct-09-0045" @default.
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