Premium
Optimizing siRNA efficacy through alteration in the target cell‐adhesion substrate interaction
Author(s) -
Khormaee Sariah,
Ali Omar A.,
Chodosh James,
Mooney David J.
Publication year - 2012
Publication title -
journal of biomedical materials research part a
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.849
H-Index - 150
eISSN - 1552-4965
pISSN - 1549-3296
DOI - 10.1002/jbm.a.34202
Subject(s) - gene silencing , gene knockdown , small interfering rna , cell adhesion , microbiology and biotechnology , biophysics , substrate (aquarium) , adhesion , cell , rna interference , materials science , integrin , cytoplasm , chemistry , nanotechnology , transfection , rna , biology , biochemistry , apoptosis , ecology , composite material , gene
Abstract The clinical potential of short interfering RNA (siRNA) based therapeutics remains hindered by the challenge of delivering enough siRNA into the cytoplasm to yield a clinically relevant effect. Although much research has focused on optimizing delivery vehicles for this class of molecules, considerably less is known about the microenvironmental influences on the response of target cells to siRNA. The substrate to which cells adhere is one component of the microenvironment that can modulate cellular behavior. Here, we tested the hypothesis that modulating the properties of cellular adhesion substrates can alter siRNA efficacy. Specifically, cationic lipid complexed siRNA particles were applied to U251 cells seeded on alginate hydrogel surfaces with systematic variation in elastic modulus and integrin ligand arginine‐glycine‐aspartate (RGD) peptide density. These experiments revealed no change in siRNA‐mediated eGFP knockdown over the elastic modulus range tested (53–133 kPa). However, an eightfold increase in RGD content of the alginate growth substrate resulted in an increase in siRNA knockdown efficacy from 25 ± 12% to 52 ± 10%, a more than twofold increase in silencing. Our results identify control of the cell‐adhesion substrate interaction as a modulator of siRNA protein silencing efficacy. © 2012 Wiley Periodicals, Inc. J Biomed Mater Res Part A 100A:2637–2643, 2012.