Journal
JOURNAL OF CONTROLLED RELEASE
Volume 166, Issue 2, Pages 106-114Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jconrel.2012.12.017
Keywords
siRNA delivery; Micellar nanoparticles; N-acetylgalactosamine; Hepatocytes targeting; Polyphosphoester
Funding
- National Basic Research Program of China (973 Program) [2012CB932500, 2010CB934001, 2013CB933900]
- National Basic Research Program of China (863 Program) [2012AA022501]
- National Natural Science Foundation of China [51125012, 51203145]
- Fundamental Research Funds for the Central Universities [WK2070000008]
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Due to its efficient and specific gene silencing ability, RNA interference has shown great potential in the treatment of liver diseases. However, achieving in vivo delivery of siRNA to critical liver cells remains the biggest obstacle for this technique to be a real clinic therapeutic modality. Here, we describe a promising liver targeting siRNA delivery system based on N-acetylgalactosamine functionalized mixed micellar nanoparticles (Gal-MNP), which can efficiently deliver siRNA to hepatocytes and silence the target gene expression after systemic administration. The Gal-MNP were assembled in aqueous solution from mixed N-acetylgalactosamine functionalized poly(ethylene glycol)-b-poly(epsilon-caprolactone) and cationic poly(epsilon-caprolactone)-b-poly(2-aminoethyl ethylene phosphate) (PCL-b-PPEEA); the properties of nanoparticles, including particle size, zeta potential and the density of poly(ethylene glycol) could be easily regulated. The hepatocyte-targeting effect of Gal-MNP was demonstrated by significant enriching of fluorescent siRNA in primary hepatocytes in vitro and in vivo. Successful down-regulation of liver-specific apolipoprotein B (apoB) expression was achieved in mouse liver, at both the transcriptional and protein level, following intravenous injection of Gal-MNP/siapoB to BALB/c mice. Systemic delivery of Gal-MNP/siRNA did not induce the innate immune response or positive hepatotoxicity. The results of this study suggested therapeutic potential for the Gal-MNP/siRNA system in liver disease. (C) 2012 Elsevier B.V. All rights reserved.
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