Poly(ethyl glyoxylate)-Poly(ethylene oxide) Nanoparticles: Stimuli-Responsive Drug Release via End-to-End Polyglyoxylate Depolymerization
作者:Bo Fan、Elizabeth R. Gillies
DOI:10.1021/acs.molpharmaceut.7b00030
日期:2017.8.7
stimuli-responsive delivery systems require many stimuli-initiated events to release drugs. “Self-immolative polymers” offer the potential to provide amplified responses to stimuli as they undergo complete end-to-end depolymerization following the cleavage of a single end-cap. Herein, linker end-caps were developed to conjugate self-immolative poly(ethyl glyoxylate) (PEtG) with poly(ethylene oxide) (PEO)
响应于特定刺激而破坏聚合物组装的能力提供了在体内某些部位或条件下选择性释放药物的潜力。然而,大多数刺激响应性递送系统需要许多刺激引发的事件来释放药物。“自焚聚合物”提供了对刺激进行放大反应的潜力,因为它们在单个端盖断裂后经历了完全的端对端解聚。本文中,开发了连接剂端盖以使自消旋聚乙醛酸乙酯(PEtG)与聚环氧乙烷(PEO)共轭以形成两亲嵌段共聚物。这些共聚物在水溶液中自组装形成纳米颗粒。连接子封端的裂解是由硫醇还原剂,紫外线,H 2 O 2引发的以及这些刺激的组合,导致纳米颗粒崩解。低刺激浓度可有效地快速破坏纳米颗粒。尼罗河红,阿霉素和姜黄素被封装到纳米颗粒中,并在施加适当刺激后被选择性释放。只需通过更改连接器端盖即可调整刺激响应能力,使该新平台对药物输送中的应用极具吸引力。
However, stimuli‐responsive hydrophilic blocks have not previously been incorporated. In this work, we synthesized amphiphilic copolymers composed of a hydrophobic polycarbamate SIP block and a hydrophilic poly(2‐(dimethylamino)ethyl methacrylate) (PDMAEMA) block connected by a UV light‐responsive linker end‐cap. It was hypothesized that after assembly of the block copolymers into nanoparticles, chain
Self-immolative polymers degrade by an end-to-end depolymerization mechanism in response to the cleavage of a stabilizing end-cap from the polymer terminus. Examples include homopolymers, mixed polymers including block copolymers, suitable for a variety of applications. A polyglyoxylate can be end-capped or capped with a linker as in a block copolymer.