期刊
JOURNAL OF CONTROLLED RELEASE
卷 88, 期 2, 页码 321-331出版社
ELSEVIER
DOI: 10.1016/S0168-3659(03)00007-5
关键词
gene therapy; lipid microtubule; hydrogel; sustained delivery; compacted DNA
Non-viral gene therapy typically results in low transfection efficiencies and transient gene expression. To address these limitations, two sustained delivery systems capable of releasing functional, compacted DNA for over 50 days were designed. A luciferase plasmid was compacted with a polylysine-polyethylene glycol conjugate and released from agarose hydrogel and lipid microtubule-hydrogel delivery systems for over 50 days. The released DNA was characterized structurally using sedimentation, electron microscopy, and serum stability, and functionally using in vitro transfections. The released DNA retained its physical compaction and nuclease resistance and was converted from supercoiled to nicked and linear forms. Released compacted DNA produced significant gene expression in vitro, although at lower levels than freshly compacted DNA. Thus, hydrogels and lipid microtubules successfully provided the slow release of bioactive, compacted DNA. (C) 2003 Elsevier Science B.V. All rights reserved.
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