Design of biodegradable hydrogel for the local and sustained delivery of angiogenic plasmid DNA

Pharmaceutical Research
Hyun Joon KongDavid J Mooney

Abstract

To attain the effective local and sustained delivery of plasmid DNA (pDNA) encoding for a growth factor. We hypothesized that controlling the degradation rate of biomaterials encapsulating pDNA via concurrent physical dissociation of the cross-linked structure and hydrolytic chain breakage of polymers would allow one to significantly broaden the range of pDNA release rate. This hypothesis was examined using ionically cross-linked polysaccharide hydrogels which were previously designed to rapidly degrade via engineering of ionic cross-linking junction and partial oxidation of polysaccharide chains. The hydrogel degradation rates were varied over the broad range, and pDNA release correlated with the gel degradation rate. Degradable hydrogels were used for the local and sustained delivery of a pDNA encoding for vascular endothelial growth factor (VEGF) in the ischemic hindlimbs of mice, and local pDNA release significantly improved the recovery of blood perfusion as compared with a bolus injection of VEGFencoding pDNA. This strategy to control the hydrogel degradation rate may be useful in regulating the delivery of a broad array of macromolecular drugs, and subsequently improve their therapeutic efficacy.

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