Jump to main content
Jump to site search

Issue 29, 2013
Previous Article Next Article

A supramolecular endosomal escape approach for enhancing gene silencing of siRNA using acid-degradable cationic polyrotaxanes

Author affiliations

Abstract

Acid-degradable cationic polyrotaxanes (PRXs) composed of N,N-dimethylaminoethyl (DMAE) group-modified α-cyclodextrins (CDs) that were threaded onto a poly(ethylene glycol) capped with a bulky stopper via acid-cleavable 3-sulfanylpropionyl ester linkages (DMAE–COO–PRX) were developed for improving the cytoplasmic transportation of PRX/siRNA polyplexes. In response to acidic pH in endosomes, the ester linkages of the DMAE–COO–PRXs were hydrolyzed and an abundance of DMAE-modified α-CDs was released from the PRXs. Wherein, the released DMAE-modified α-CDs showed endosomal membrane destabilization through the removal of phospholipids from the membrane, resulting in the endosomal escape of siRNA. The confocal fluorescence microscopic observation revealed that the colocalization ratio of siRNAs to endosomes decreased for DMAE–COO–PRX in comparison with disulfide-introduced PRX (DMAE–SS–PRX). As a result, the DMAE–COO–PRX/siRNA showed higher gene silencing activity than DMAE–SS–PRX and linear poly(ethylenimine) (L-PEI) even at low siRNA concentration (10 nM). Therefore, the DMAE–COO–PRXs are an effective candidate as a carrier for cytoplasmic siRNA delivery.

Graphical abstract: A supramolecular endosomal escape approach for enhancing gene silencing of siRNA using acid-degradable cationic polyrotaxanes

Back to tab navigation

Supplementary files

Publication details

The article was received on 10 Apr 2013, accepted on 21 May 2013 and first published on 21 May 2013


Article type: Paper
DOI: 10.1039/C3TB20514B
J. Mater. Chem. B, 2013,1, 3535-3544

  •   Request permissions

    A supramolecular endosomal escape approach for enhancing gene silencing of siRNA using acid-degradable cationic polyrotaxanes

    A. Tamura and N. Yui, J. Mater. Chem. B, 2013, 1, 3535
    DOI: 10.1039/C3TB20514B

Search articles by author

Spotlight

Advertisements