The present invention relates to nanoparticles comprising at least one negatively charged glycosaminoglycan-type macromolecule or a derivative thereof, non-covalently coupled to at least one molecule of a cationic hydrocarbon-based radical of squalene nature represented by the formula (I) which follows:
wherein:
A, B, C, D, E and F are a hydrogen atom or a methyl group; Z and Y represent a radical
an ethyltrialkylammonium radical, an ethylguanidium radical or a 1-[ethylideneamino]guanidinium radical with the proviso that at least one of Z and Y is different from
the symbol * showing the position of the attachment of the radical to the structure; and n is equal to 1 or 2.
The present invention also relates to a method for preparing said nanoparticles, and to a lyophilisate, a solid dosage form and pharmaceutical or dermatological compositions comprising said nanoparticles. Said nanoparticles are useful as medicines and more particularly as anticoagulant agents.
Novel self assembling nanoparticles for the oral administration of fondaparinux: Synthesis, characterization and in vivo evaluation
作者:Bettina Ralay-Ranaivo、Didier Desmaële、Elsa P. Bianchini、Elise Lepeltier、Claudie Bourgaux、Delphine Borgel、Thierry Pouget、Jean François Tranchant、Patrick Couvreur、Ruxandra Gref
DOI:10.1016/j.jconrel.2014.07.060
日期:2014.11
Fondaparinux (Fpx) is the anticoagulant of choice in the treatment of short- and medium-term thromboembolic disease. To overcome the low oral bioavailability of Fpx, a new nanoparticulate carrier has been developed. The nanoparticles (NPs) contain squalenyl derivatives, known for their excellent oral bioavailability. They spontaneously self-assemble upon both electrostatic and hydrophobic interactions between the polyanionic Fpx and cationic squalenyl (CSq) derivatives. The preparation conditions were optimized to obtain monodisperse, stable NPs with a mean diameter in the range of 150-200 nm. The encapsulation efficiencies were around 80%. Fpx loadings reached 39 wt.%. According to structural and morphological analysis, Fpx and CSq organized in spherical multilamellar ("onion-type") nanoparticles. Furthermore, in vivo studies in rats suggested that Fpx was well absorbed from the orally administered NPs, which totally dissociated when reaching the blood stream, leading to the release of free Fpx. The Fpx: CSq NPs improved the plasmatic concentration of Fpx in a dose-dependent manner. However, the oral bioavailability of these new NPs remained low (around 0.3%) but of note, the C-max obtained after oral administration of 50 mg/kg NPs was close to the prophylactic plasma concentration needed to treat venous thromboembolism. Moreover, the oral bioavailability of Fpx could be dramatically increased up to 9% by including the nanoparticles into gastroresistant capsules. This study opens up new perspectives for the oral administration of Fpx and paves the way towards elaborating squalene-based NPs which self assemble without the need of covalently grafting the drug to Sq. (C) 2014 The Authors. Published by Elsevier B.V.
[EN] NANOPARTICLES BASED ON A GAG AND A SQUALENE<br/>[FR] NANOPARTICULES FORMÉES À PARTIR DE GAG ET DE SQUALÈNE
申请人:CENTRE NAT RECH SCIENT
公开号:WO2014091436A1
公开(公告)日:2014-06-19
The present invention relates to nanoparticles comprising at least one negatively charged glycosaminoglycan-type macromolecule or a derivative thereof, non-covalently coupled to at least one molecule of a cationic hydrocarbon-based radical of squalene nature represented by the formula (I) which follows: (I) wherein: A, B, C, D, E and F are a hydrogen atom or a methyl group; Z and Y represent a radical (formula (II)), an ethyltrialkylammonium radical, an ethylguanidium radical or a 1-[ethylideneamino]guanidinium radical with the proviso that at least one of Z and Y is different from (formula (II)), the symbol * showing the position of the attachment of the radical to the structure; and n is equal to 1 or 2. The present invention also relates to a method for preparing said nanoparticles, and to a lyophilisate, a solid dosage form and pharmaceutical or dermatological compositions comprising said nanoparticles. Said nanoparticles are useful as medicines and more particularly as anticoagulant agents.