期刊
NANOMEDICINE
卷 8, 期 12, 页码 1955-1968出版社
FUTURE MEDICINE LTD
DOI: 10.2217/nnm.12.202
关键词
diffusion; intravitreal injection; nanomedicine; nanoparticle; ocular gene therapy; polyplex; single-particle tracking
资金
- Ghent University
- Fund for Scientific Research Flanders (FWO, Belgium)
- Hasselt University
Aim: To develop a robust assay to evaluate and compare the intravitreal mobility of nanoparticles in the intact vitreous body. Materials & methods: Excised bovine eyes were prepared to preserve the fragile structure of the vitreous humor, while permitting high-resolution fluorescence microscopy and single-particle tracking analysis of intravitreally injected nanoparticles. This assay was validated by analyzing polystyrene beads and further employed to evaluate gene nanomedicines composed of poly(amido amine)s and plasmid DNA. Results: The assay was able to distinguish immobilized cationic nanoparticles from mobile PEGylated nanoparticles. PEGylation of the polyplexes resulted in a drastic improvement of their mobility. Conclusion: An ex vivo eye model is presented for studying nanoparticle mobility in intact vitreous humor by single-particle tracking microscopy. These results give important guidelines for developing gene- and drug-delivery nanomedicines that are compatible with intravitreal administration. Original submitted 20 April 2012; Revised submitted 22 November 2012
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