alexa Abstract | Enzyme-triggered PEGylated siRNA-nanoparticles for controlled release of siRNA

Journal of RNAi and Gene Silencing
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Abstract

A key goal of our recent research efforts has been to develop novel ‘triggerable nanoparticle’ systems with real potential utility in vivo. These are designed to be stable from the point of administration until a target site of interest is reached, then triggered for the controlled release of therapeutic agent payload(s) at the target site by changes in local endogenous conditions or through the application of some exogenous stimulus. Here we describe investigations into the use of enzymes to trigger RNAi-mediated therapy through a process of enzymeassisted nanoparticle triggerability. Our approach is to use PEG2000-peptidyl lipids with peptidyl moieties sensitive to tumour-localized elastase or matrix metalloproteinase-2 digestion, and from these prepare putative enzyme-triggered PEGylated siRNA-nanoparticles. Our results provide initial proof of concept in vitro. From these data, we propose that this concept should be applicable for functional delivery of therapeutic nucleic acids to tumour cells in vivo, although the mechanism for enzyme-assisted nanoparticle triggerability remains to be fully characterized.

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Author(s): Peerada Yingyuad Mathieu Mvel Carla Prata Christos Kontogiorgis Maya Thanou and Andrew D Miller

Keywords

Liposomes, elastase, enzyme, triggerable nanoparticles, triggered release, peptide, RNAi, Gene Silencing

 
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