| Autor: |
Zou, Peng, Chen, Hongwei, Paholak, Hayley J., Sun, Duxin |
| Zdroj: |
Molecular Pharmaceutics; November 2013, Vol. 10 Issue: 11 p4185-4194, 10p |
| Abstrakt: |
Understanding in vivodrug release kinetics is critical for the development of nanoparticle-based delivery systems. In this study, we developed a fluorescence resonance energy transfer (FRET) imaging approach to noninvasively monitor in vitroand in vivocargo release from polymeric nanoparticles. The FRET donor dye (DiO or DiD) and acceptor dye (DiI or DiR) were individually encapsulated into poly(ethylene oxide)-b-polystyrene (PEO-PS) nanoparticles. When DiO (donor) nanoparticles and DiI (acceptor) nanoparticles were coincubated with cancer cells for 2 h, increased FRET signals were observed from cell membranes, suggesting rapid release of DiO and DiI to cell membranes. Similarly, increased FRET ratios were detected in nude mice after intravenous coadministration of DiD (donor) nanoparticles and DiR (acceptor) nanoparticles. In contrast, another group of nude mice i.v. administrated with DiD/DiR coloaded nanoparticles showed decreased FRET ratios. Based on the difference in FRET ratios between the two groups, in vivoDiD/DiR release half-life from PEO-PS nanoparticles was determined to be 9.2 min. In addition, it was observed that the presence of cell membranes facilitated burst release of lipophilic cargos while incorporation of oleic acid-coated iron oxide into PEO-PS nanoparticles slowed the release of DiD/DiR to cell membranes. The developed in vitroand in vivoFRET imaging techniques can be used to screening stable nanoformulations for lipophilic drug delivery. |
| Databáze: |
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