tailieunhanh - Báo cáo khoa hoc:" Evaluation of triblock copolymeric micelles of δvalerolactone and poly (ethylene glycol) as a competent vector for doxorubicin delivery against cancer"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành y học dành cho các bạn tham khảo đề tài: Evaluation of triblock copolymeric micelles of δvalerolactone and poly (ethylene glycol) as a competent vector for doxorubicin delivery against cancer | Nair K et al. Journal of Nanobiotechnology 2011 9 42 http content 9 1 42 JOURNAL OF NANOBIOTECHNOLOGY RESEARCH Open Access Evaluation of triblock copolymeric micelles of Ỗ-valerolactone and poly ethylene glycol as a competent vector for doxorubicin delivery against cancer Lekha Nair K 1 Sankar Jagadeeshan2 S Asha Nair2 and G S Vinod Kumar1 Abstract Background Specific properties of amphiphilic copolymeric micelles like small size stability biodegradability and prolonged biodistribution have projected them as promising vectors for drug delivery. To evaluate the potential of ỗ-valerolactone based micelles as carriers for drug delivery a novel triblock amphiphilic copolymer poly S-valerolactone poly ethylene glycol poly ỗ-valerolactone VEV was synthesized and characterized using IR NMR GPC DTA and TGA. To evaluate VEV as a carrier for drug delivery doxorubicin DOX entrapped VEV micelles VEVDMs were prepared and analyzed for in vitro antitumor activity. Results VEV copolymer was successfully synthesized by ring opening polymerization and the stable core shell structure of VEV micelles with a low critical micelle concentration was confirmed by proton NMR and fluorescence based method. Doxorubicin entrapped micelles VEVDMs prepared using a modified single emulsion method were obtained with a mean diameter of 90 nm and high encapsulation efficiency showing a pH dependent sustained doxorubicin release. Biological evaluation in breast adenocarcinoma MCF7 and glioblastoma U87MG cells by flow cytometry showed 2-3 folds increase in cellular uptake of VEVDMs than free DOX. Block copolymer micelles without DOX were non cytotoxic in both the cell lines. As evaluated by the IC50 values VEVDMs induced more cytotoxicity in MCF7 cells and 76 more cytotoxicity in U87MG cells than pristine DOX after 24 48 72 h treatment respectively. Moreover VEVDMs induced enhanced apoptosis than free DOX as indicated by higher shift in Annexin .

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