Author(s): Saravanakumar G, Min KH, Min DS, Kim AY, Lee CM,
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Abstract Development of successful formulations for poorly water-soluble drugs remains a longstanding critical and challenging issue in cancer therapy. As a potential drug carrier of paclitaxel, hydrotropic oligomer-glycol chitosan (HO-GC) was synthesized by chemical conjugation of the N,N-diethylnicotinamide-based oligomer, uniquely designed for enhancing the aqueous solubility of paclitaxel, to the backbone of glycol chitosan. Owing to its amphiphilicity, the conjugate formed self-assembled nanoparticles with a mean diameter of 313+/-13nm in a phosphate-buffered saline (PBS, pH 7.4 at 37 degrees C). HO-GC nanoparticles maintained their structure for up to 50days in PBS. They could encapsulate a high quantity (20wt.\%) of paclitaxel (PTX) with a maximum drug-loading efficiency of 97\%, due to the presence of hydrotropic inner cores. When HO-GC-PTX particles were exposed to the 0.1M sodium salicylate solution in PBS (pH 7.4), PTX was released from nanoparticles in a sustained manner. From the cytotoxicity test, it was confirmed that HO-GC-PTX nanoparticles showed lower cytotoxicity than free PTX formulation in 50\%/50\% Cremophor EL/ethanol mixture. The optical imaging results indicated that near-infrared fluorescence dye (Cy5.5)-labeled HO-GC-PTX showed an excellent tumor specificity in SCC7 tumor-bearing mice, due to the enhanced permeation and retention effect. Overall, HO-GC-PTX nanoparticles might be a promising carrier for PTX delivery in cancer therapy.
This article was published in J Control Release
and referenced in Journal of Nanomedicine & Nanotechnology