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Incorporation of Naked Peptide Nucleic Acids into Liposomes Leads to Fast and Efficient Delivery.

The delivery of peptide nucleic acids (PNAs) to cells is a very challenging task. We report here that a liposomal formulation composed of egg PC/cholesterol/DSPE-PEG2000 can be loaded, according to different encapsulation techniques, with PNA or fluorescent PNA oligomers. PNA loaded liposomes efficiently and quickly promote the uptake of a PNA targeting the microRNA miR-210 in human erythroleukemic K562 cells. By using this innovative delivery system for PNA, down-regulation of miR-210 is achieved at a low PNA concentration.