期刊
JOURNAL OF BIOMATERIALS SCIENCE-POLYMER EDITION
卷 22, 期 14, 页码 1845-1859出版社
TAYLOR & FRANCIS LTD
DOI: 10.1163/092050610X528552
关键词
Microparticles; layer-by-layer; biopolymers; pH sensor; plasmid DNA
资金
- Ministry of Education (Singapore)
In recent years colloidal particles and capsules, layer-by-layer (LbL) coated with biocompatible polyelectrolytes, have received much attention as drug-delivery systems. In this study an LbL-assembled, biopolymer-based multilayer system was established as a combined transporter and sensor for monitoring intracellular degradation and processing. CaCO3 cores were functionalized with fluorescein isothiocyanate-labelled poly(allylamine hydrochloride) (FITC-PAH). This pH-sensitive fluorescent dye allows identifying the location of these LbL-coated particles in cell compartments of different pH, like the endo-lysosome and cytoplasm. The labelled core was then coated with consecutive layers of protamine (PRM) and dextran sulfate (DXS). Finally, plasmid DNA (pEGFP-C1) as a reporter agent for drug release in the cytoplasm was integrated into the biocompatible and degradable PRM/DXS multilayer. The system was tested regarding its long-term stability and interaction with HEK 293T/17 cells. These multifunctional microparticles allow the simultaneous investigation of particle localization and processing within cells, and should thus provide a valuable tool for studying and improving the controlled LbL-based release of active agents into cells. (C) Koninklijke Brill NV, Leiden, 2011
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