Abstract
Targeted delivery is a key element for improving the efficiency and safety of nonviral vectors for gene therapy. We have recently developed a CD44 receptor targeted, hyaluronic acid-adamantamethamidyl based pendant polymer system (HA-Ad), capable of forming complexes with cationic β-cyclodextrins (CD-PEI(+)) and pDNA. Complexes formed using these compounds (HA-Ad:CD-PEI(+):pDNA) display high water solubility, good transfection efficiency, and low cytotoxicity. Spatial and dynamic tracking of the transfection complexes by confocal microscopy and multicolor flow cytometry techniques was used to evaluate the target specificity, subcellular localization, and endosomal escape process. Our data shows that cells expressing the CD44 receptor undergo enhanced cellular uptake and transfection efficiency with HA-Ad:CD-PEI(+):pDNA complexes. This transfection system, comprised noncovalent assembly of cyclodextrin:adamantamethamidyl-modified hyaluronic acid via host:guest interactions to condense pDNA, is a potentially useful tool for targeted delivery of nucleic acid therapeutics.
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