alexa Chitosan-based formulations for delivery of DNA and siRNA.
Genetics & Molecular Biology

Genetics & Molecular Biology

Journal of Genetic Syndromes & Gene Therapy

Author(s): Mao S, Sun W, Kissel T

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Abstract Among non-viral vectors, chitosan and chitosan derivatives have been developed in vitro and in vivo for DNA and siRNA delivery systems because of their cationic charge, biodegradability and biocompatibility, as well as their mucoadhesive and permeability-enhancing properties. However, the transfection efficiency of chitosan is too low for clinical application. Studies indicated that the transfection efficiency depends on a series of chitosan-based formulation parameters, such as the Mw of chitosan, its degree of deacetylation, the charge ratio of chitosan to DNA/siRNA (N/P ratio), the chitosan salt form used, the DNA/siRNA concentration, pH, serum, additives, preparation techniques of chitosan/nucleic acid particles and routes of administration. In this paper, chitosan-based formulations for the delivery of DNA and siRNA were reviewed to facilitate the process of chitosan vector development for clinical application. In addition to formulation optimization, chitosan structure modification or additive incorporation is an effective way to improve the stability of the polyplex in biological fluids, enhance targeted cell delivery and facilitate endo-lysosomal release of the complex. In summary, the transfection efficiency of chitosan-based delivery systems can be adjusted by changing formulation-related parameters. 2009 Elsevier B.V. All rights reserved. This article was published in Adv Drug Deliv Rev and referenced in Journal of Genetic Syndromes & Gene Therapy

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