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作为药物递送载体的神经导向通道

Nerve guidance channels as drug delivery vehicles.

作者信息

Piotrowicz Alexandra, Shoichet Molly S

机构信息

Department of Chemical Engineering and Applied Chemistry, University of Toronto, 200 College St., Toronto, Ont., Canada.

出版信息

Biomaterials. 2006 Mar;27(9):2018-27. doi: 10.1016/j.biomaterials.2005.09.042. Epub 2005 Oct 18.

Abstract

Nerve guidance channels (NGCs) have been shown to facilitate regeneration after transection injury to the peripheral nerve or spinal cord. Various therapeutic molecules, including neurotrophic factors, have improved regeneration and functional recovery after injury when combined with NGCs; however, their impact has not been maximized partly due to the lack of an appropriate drug delivery system. To address this limitation, nerve growth factor (NGF) was incorporated into NGCs of poly(2-hydroxyethyl methacrylate-co-methyl methacrylate), P(HEMA-co-MMA). The NGCs were synthesized by a liquid-liquid centrifugal casting process and three different methods of protein incorporation were compared in terms of protein distribution and NGF release profile: (1) NGF was encapsulated (with BSA) in biodegradable poly(d,l-lactide-co-glycolide) 85/15 microspheres, which were combined with a PHEMA polymerization formulation and coated on the inside of pre-formed NGCs by a second liquid-liquid centrifugal casting technique; (2) pre-formed NGCs were imbibed with a solution of NGF/BSA and (3) NGF/BSA alone was combined with a PHEMA formulation and coated on the inside of pre-formed NGCs by a second liquid-liquid centrifugal casting technique. Using a fluorescently labelled model protein, the distribution of proteins in NGCs prepared with a coating of either protein-loaded microspheres or protein alone was found to be confined to the inner PHEMA layer. Sustained release of NGF was achieved from NGCs with either NGF-loaded microspheres or NGF alone incorporated into the inner layer, but not from channels imbibed with NGF. By day 28, NGCs with microspheres released a total of 220 pg NGF/cm of channel whereas those NGCs imbibed with NGF released 1040 pg/cm and those NGCs with NGF incorporated directly in a PHEMA layer released 8624 pg/cm. The release of NGF from NGCs with microspheres was limited by a slow-degrading microsphere formulation and by the maximum amount of microspheres that could be incorporated into the NGCs structure. Notwithstanding, the liquid-liquid centrifugal casting process is promising for localized and controlled release of multiple factors that are key to tissue regeneration.

摘要

神经导向通道(NGCs)已被证明可促进周围神经或脊髓横断损伤后的再生。各种治疗分子,包括神经营养因子,与NGCs联合使用时可改善损伤后的再生和功能恢复;然而,由于缺乏合适的药物递送系统,它们的作用尚未得到最大化发挥。为解决这一局限性,将神经生长因子(NGF)掺入聚(甲基丙烯酸2 - 羟乙酯 - 共 - 甲基丙烯酸甲酯),即P(HEMA - co - MMA)的NGCs中。通过液 - 液离心浇铸法合成NGCs,并从蛋白质分布和NGF释放曲线方面比较了三种不同的蛋白质掺入方法:(1)将NGF(与牛血清白蛋白一起)封装在可生物降解的聚(d,l - 丙交酯 - 共 - 乙交酯)85/15微球中,将其与PHEMA聚合配方混合,并通过第二次液 - 液离心浇铸技术涂覆在预先形成的NGCs内部;(2)用NGF/BSA溶液浸泡预先形成的NGCs;(3)单独的NGF/BSA与PHEMA配方混合,并通过第二次液 - 液离心浇铸技术涂覆在预先形成的NGCs内部。使用荧光标记的模型蛋白,发现用载有蛋白质的微球或单独蛋白质涂层制备的NGCs中蛋白质的分布局限于内部的PHEMA层。从内层掺入NGF负载微球或单独NGF的NGCs中实现了NGF的持续释放,但从用NGF浸泡的通道中未实现。到第28天,含有微球的NGCs总共释放了220 pg NGF/cm通道,而用NGF浸泡的NGCs释放了1040 pg/cm,直接掺入PHEMA层的NGCs释放了8624 pg/cm。含有微球的NGCs中NGF的释放受到缓慢降解的微球配方以及可掺入NGCs结构中的微球最大量的限制。尽管如此,液 - 液离心浇铸法对于局部和控制释放组织再生关键的多种因子具有前景。

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