An innovative hydrogel of gemcitabine-loaded lipid nanocapsules: when the drug is a key player of the nanomedicine structure
作者:Elodie Moysan、Yolanda González-Fernández、Nolwenn Lautram、Jérôme Béjaud、Guillaume Bastiat、Jean-Pierre Benoit
DOI:10.1039/c3sm52781f
日期:——
A new method to form a nanoparticle-structured hydrogel is reported; it is based on the drug being loaded into the nanoparticles to form a solid structure. A lipophilic form of gemcitabine (modified lauroyl), an anti-cancer drug, was encapsulated in lipid nanocapsules (LNCs), using a phase-inversion temperature process. A gel was formed spontaneously, depending on the LNC concentration. The drug loading, measured with total entrapment efficiency, and the rheological properties of the gel were assessed. Physical studies (surface tension measurements) showed that modified gemcitabine was localised at the oil–water interface of the LNC, and that the gemcitabine moieties of the prodrug were exposed to the water phase. This particular assembly promoted inter-LNC interactions via hydrogen bonds between gemcitabine moieties that led to an LNC gel structure in water, without a matrix, like a tridimensional pearl necklace. Dilution of the gel produced a gemcitabine-loaded LNC suspension in water, and these nanoparticles presented cytotoxic activity to various cancer cell lines to a greater degree than the native drug. Finally, the syringeability of the formulation was successfully tested and perspectives of its use as a nanomedicine (intratumoural or subcutaneous injection) can be foreseen.
报道了一种形成纳米颗粒结构水凝胶的新方法;它基于将药物加载到纳米颗粒中以形成固体结构。使用相转变温度过程将亲脂形式的抗癌药物吉西他滨(修饰的月桂酰)封装在脂质纳米胶囊 (LNC) 中。根据 LNC 浓度,凝胶会自发形成。评估了以总包封效率测量的载药量和凝胶的流变特性。物理研究(表面张力测量)表明,修饰的吉西他滨位于 LNC 的油水界面,并且前药的吉西他滨部分暴露于水相。这种特殊的组装通过吉西他滨部分之间的氢键促进 LNC 之间的相互作用,从而在水中形成 LNC 凝胶结构,没有基质,就像三维珍珠项链一样。凝胶的稀释产生了负载吉西他滨的 LNC 水悬浮液,这些纳米颗粒对各种癌细胞系的细胞毒性活性比天然药物更大。最后,该制剂的可注射性得到了成功测试,并且可以预见其作为纳米药物(肿瘤内或皮下注射)的使用前景。