The effects of mixed MPEG-PLA/PluronicA+ copolymer micelles on the bioavailability and multidrug resistance of docetaxel

• Published in: Biomaterials 2010-03, Vol.31 (8), p.2371-2379
• Main Authors: Mu, Chao-Feng, Balakrishnan, Prabagar, Cui, Fu-De, Yin, Yong-Mei, Lee, Yong-Bok, Choi, Han-Gon, Yong, Chul Soon, Chung, Suk-Jae, Shim, Chang-Koo, Kim, Dae-Duk
• Format: Article
• Language: English
• ISSN: 0142-9612
• DOI: 10.1016/j.biomaterials.2009.11.102

A mixed micelle that comprised of MPEG-PLA (MPP) and PluronicA+ copolymers was developed for enhanced bioavailability and to overcome multidrug resistance of docetaxel in cancer therapy. The mixed micelles that sufficiently solubilized docetaxel were evaluated for the effect of PluronicA+ copolymers weight ratio on the mixed micelles with respect to drug loading and drug release. In vitro, cell viability and cytotoxicity studies in KB and KBv cells revealed that the mixed micellar formulations were more potent than the commercial docetaxel formulation (TaxotereA+). In vivo pharmacokinetics study in rats showed that the mixed micelles significantly enhanced the bioavailability of docetaxel (3.6 fold) than TaxotereA+. Moreover, antitumor activity assessed in KBv cancer xenograft BALB/C nude mice models showed that the mixed micelles significantly reduced the tumor size than the control (TaxotereA+). Clear differences in the intracellular uptake of docetaxel between MPP and mixed micelles were observed using confocal laser scanning microscopy. This study presents not only a new micelle structure for a diblock-triblock copolymer system, but also a method for enhanced bioavailability of docetaxel and to overcome some of the limitations on its multidrug resistance in cancer therapy.