A poly(L-lysine)-based hydrophilic star block co-polymer as a protein nanocarrier with facile encapsulation and pH-responsive release

作者：Yan, Yunsong; Wei, Daixu^*; Li, Jiayan; Zheng, Jinhong; Shi, Ganggang; Luo, Wenhong; Pan, Ying; Wang, Jinzhi; Zhang, Lumian; He, Xiaoying; Liu, Daojun

来源：Acta Biomaterialia, 2012, 8(6): 2113-2120.

DOI：10.1016/j.actbio.2012.02.016

• Star block co-polymer
• Drug delivery system
• Poly(L-lysine)
• Insulin
• Protein

A hydrophilic star block co-polymer was synthesized, characterized, and evaluated as a protein nanocarrier. The star block co-polymer was composed of a hyperbranched polyethylenimine (PEI) core, a poly(L-lysine) (PLL) inner shell, and a poly(ethylene glycol) (PEG) outer shell. The model protein insulin can be rapidly and efficiently encapsulated by the synthesized polymer in aqueous phosphate buffer at physiological pH. Complexation between PEI-PLL-b-PEG and insulin was investigated using native polyacryl-amide gel electrophoresis. The uptake of enhanced green fluorescent protein into Ad293 cells mediated by PEI-PLL-b-PEG was also investigated. The encapsulated insulin demonstrated sustained release at physiological pH and showed accelerated release when the pH was decreased. The insulin released from the star block co-polymer retained its chemical integrity and immunogenicity.

• 出版日期2012-7
• 单位汕头大学