Chimeric Antisense Oligonucleotide Conjugated to α-Tocopherol.

Abstract:

:We developed an efficient system for delivering short interfering RNA (siRNA) to the liver by using α-tocopherol conjugation. The α-tocopherol-conjugated siRNA was effective and safe for RNA interference-mediated gene silencing in vivo. In contrast, when the 13-mer LNA (locked nucleic acid)-DNA gapmer antisense oligonucleotide (ASO) was directly conjugated with α-tocopherol it showed markedly reduced silencing activity in mouse liver. Here, therefore, we tried to extend the 5'-end of the ASO sequence by using 5'-α-tocopherol-conjugated 4- to 7-mers of unlocked nucleic acid (UNA) as a "second wing." Intravenous injection of mice with this α-tocopherol-conjugated chimeric ASO achieved more potent silencing than ASO alone in the liver, suggesting increased delivery of the ASO to the liver. Within the cells, the UNA wing was cleaved or degraded and α-tocopherol was released from the 13-mer gapmer ASO, resulting in activation of the gapmer. The α-tocopherol-conjugated chimeric ASO showed high efficacy, with hepatic tropism, and was effective and safe for gene silencing in vivo. We have thus identified a new, effective LNA-DNA gapmer structure in which drug delivery system (DDS) molecules are bound to ASO with UNA sequences.

journal_name

Mol Ther Nucleic Acids

authors

Nishina T,Numata J,Nishina K,Yoshida-Tanaka K,Nitta K,Piao W,Iwata R,Ito S,Kuwahara H,Wada T,Mizusawa H,Yokota T

doi

10.1038/mtna.2014.72

subject

Has Abstract

pub_date

2015-01-13 00:00:00

pages

e220

issn

2162-2531

pii

mtna201472

journal_volume

4

pub_type

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