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In order to enhance paclitaxel oral bioavailability, mixed polymeric micelles that comprised of pluronic copolymers and low molecular weight heparin-all-trans-retinoid acid (LHR) conjugate were developed. PTX-loaded mixed polymeric micelles (MPMs) were prepared by dialysis method with high drug loading 26.92±2.08% and 25.82±1.9% for F127/LHR and P188/LHR MPMs respectively, and were found to be spherical in shape with an average size of around 140nm and a narrow size distribution. In vitro release study showed that pluronic/LHR MPMs exhibited delayed release characteristics compared to Taxol and faster drug release profile compared to LHR plain polymeric micelles (PPMs). The cytotoxic activity of PTX-loaded pluronic/LHR MPMs was slightly higher than LHR PPMs in MCF-7 cells (p <0.01). In situ effective permeability of PTX through rat small intestine was 5- to 6-fold higher with mixed micelles than that of Taxol. Moreover, pluronic/LHR MPMs achieved significantly higher AUC and C max level than both of LHR PPMs and Taxol. This enhancement might be due to the inhibition of both P-glycoprotein efflux system and cytochrome P450 metabolism by pluronic copolymers. The current results encourage further development of paclitaxel mixed polymeric micelles as an oral drug delivery system.
Publication date: Available online 2 May 2013Source:Computational Biology and Chemistry Author(s): Jimmy Franco , Margaret A.L. Blackie , David Toth , Peter J. Smith , Joseph Capuano , Kurt Fastnacht , Charlotte Berkes Malaria continues to affect millions of people annually. With ... mehr
Publication date: Available online 29 April 2013Source:Current Opinion in Chemical Biology Author(s): Daniel J Scott , Lutz Kummer , Dirk Tremmel , Andreas Plückthun Integral membrane proteins (IMPs) are crucial components of all cells but are difficult to study in vitro because the ... mehr
Publication date: Available online 3 May 2013Source:Current Opinion in Chemical Biology Author(s): Jayanta Chatterjee , Maja Köhn Protein phosphatase-1 (PP1) has long been neglected as a potential drug target owing to its misinterpreted unselective nature. However, growing evidence de ... mehr
Der Spektrum Akademischer Verlag, Teil des Elsevier-Verlags, hat sich entschlossen, sich auf sein Kerngeschäft zu konzentrieren und die Seminartätigkeit zum 01.01.2007 aufzugeben.
In der PromoCell Academy sieht der Verlag einen Partner und Nachfolger mit Kernkompetenz "Schulungen im naturw ... mehr
Elsevier, Herausgeber wissenschaftlicher , technischer und medizinischer Information, gab bekannt, dass das Unternehmen die erste Sitzung des Biowissenschaftsbeirates am Freitag, den 24. Juni im Hauptsitz des Unternehmens in Amsterdam einberufen hat. Der Beirat besteht aus einer Gruppe inte ... mehr