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Antiviral Efficacy of a Short PNA Targeting microRNA-122 Using Galactosylated Cationic Liposome as a Carrier for the Delivery of the PNA-DNA Hybrid to Hepatocytes

  • Kim, Hyoseon (Department of Bioscience and Biotechnology, Konkuk University) ;
  • Lee, Kwang Hyun (Department of Bioscience and Biotechnology, Konkuk University) ;
  • Kim, Kyung Bo (Department of Bioscience and Biotechnology, Konkuk University) ;
  • Park, Yong Serk (Department of Biomedical Laboratory Science, Yonsei University) ;
  • Kim, Keun-Sik (Department of Biomedical Laboratory Science, Konyang University) ;
  • Kim, Dong-Eun (Department of Bioscience and Biotechnology, Konkuk University)
  • 투고 : 2012.11.07
  • 심사 : 2012.12.05
  • 발행 : 2013.03.20

초록

Peptide nucleic acids (PNAs) that bind to complementary nucleic acid sequences with extraordinarily high affinity and sequence specificity can be used as antisense oligonucleotides against microRNAs, namely antagomir PNAs. However, methods for efficient cellular delivery must be developed for effective use of PNAs as therapeutic agents. Here, we demonstrate that antagomir PNAs can be delivered to hepatic cells by complementary DNA oligonucleotide and cationic liposomes containing galactosylated ceramide and a novel cationic lipid, DMKE (O,O'-dimyristyl-N-lysyl glutamate), through glycoprotein-mediated endocytosis. An antagomir PNA was designed to target miR-122, which is required for translation of the hepatitis C virus (HCV) genome in hepatocytes, and was hybridized to a DNA oligonucleotide for complexation with cationic liposome. The PNA-DNA hybrid molecules were efficiently internalized into hepatic cells by complexing with the galactosylated cationic liposome in vitro. Galactosylation of liposome significantly enhanced both lipoplex cell binding and PNA delivery to the hepatic cells. After 4-h incubation with galactosylated lipoplexes, PNAs were efficiently delivered into hepatic cells and HCV genome translation was suppressed more than 70% through sequestration of miR-122 in cytoplasm. PNAs were readily released from the PNA-DNA hybrid in the low pH environment of the endosome. The present study indicates that transfection of PNA-DNA hybrid molecules using galactosylated cationic liposomes can be used as an efficient non-viral carrier for antagomir PNAs targeted to hepatocytes.

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