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In Vivo Evaluation Of Doxorubicin-loaded Polymeric Micelles Targeting Folate Receptors And Early Endosomal PH In Drug-resistant Ovarian Cancer.

D. Kim, Z. G. Gao, E. Lee, Y. Bae
Published 2009 · Chemistry, Medicine

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The second generation of pH-sensitive micelles composed of poly(l-histidine-co-l-phenlyalanine(16 mol %))(MW:5K)-b-PEG(MW:2K) and poly(l-lactic acid)(MW:3K)-b-PEG(MW:2K)-folate (80/20 wt/wt %) was previously optimized by physicochemical and in vitro tests for both folate receptor and early endosomal pH targeting (pH approximately 6.0). In this study, the therapeutic efficacy of the doxorubicin (DOX)-loaded micelles (DOX loading content: 20 wt %) was evaluated using in vivo tests. Multidrug-resistant (MDR) ovarian tumor-xenografted mouse models were employed. The skin-fold dorsal window chamber model was applied for visualization of extravasation and drug retention for the initial one hour after iv injection. Noninvasive imaging followed, providing evidence of drug accumulation in the tumor after the first hour. The biodistribution study further supported the long circulation of the drug carrier, tumor-selective accumulation and intracellular drug delivery. Comprehensive tumor growth inhibition experiments examined the collective efficacy of the pH-sensitive micelles. The micelle formulation effectively suppressed the growth of existing MDR tumors in mice for at least 50 days by three iv injections at a 3-day interval at a dose of 10 mg of DOX/kg. The body weight of the animals treated with the test micelle formulation gradually increased over the experimental time period, rather than decreasing. The micelle formulation was superior to its first generation, which targeted pH 6.8 and folate receptor.
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