Target Binding Influences Permeability in Aptamer–Polyelectrolyte Microcapsules
- 12 April 2011
- Vol. 7 (9), 1219-1226
- https://doi.org/10.1002/smll.201001829
Abstract
Aptamer–polyelectrolyte microcapsules are prepared for potential use as triggered delivery vehicles and microreactors. The hollow microcapsules are prepared from the sulforhodamine B aptamer and the polyelectrolytes poly(allylamine hydrochloride) and poly(sodium 4‐styrene‐sulfonate), using layer‐by‐layer (LbL) film deposition templated on a sacrificial CaCO3 spherical core. Scanning electron microscopy and confocal microscopy confirm the formation of spherical CaCO3 cores and LbL‐aptamer microcapsules. Colocalization studies with fluorescently‐tagged aptamer and sulforhodamine B verify the ability of the aptamer to recognize its cognate target in the presence of the K+ ions that are required for its characteristic G‐quadruplex formation. Fluorescence recovery after photobleaching studies confirms a significant difference in the permeability of the aptamer–polyelectrolyte microcapsules for the sulforhodamine B dye target compared to control microcapsules prepared with a random oligonucleotide. These results suggest that aptamer‐based ‘smart’ responsive films and microcapsules could be applied to problems of catalysis and controlled release.This publication has 74 references indexed in Scilit:
- Aptamers for Targeted Drug DeliveryPharmaceuticals, 2010
- Design Strategies for Aptamer-Based BiosensorsSensors, 2010
- Nanotechnology in fertilizersNature Nanotechnology, 2010
- Targeted delivery of cisplatin to prostate cancer cells by aptamer functionalized Pt(IV) prodrug-PLGA–PEG nanoparticlesProceedings of the National Academy of Sciences of the United States of America, 2008
- Ultrasound‐Triggered Release from Multilayered CapsulesSmall, 2007
- Multiple and time-scheduled in situ DNA delivery mediated by β-cyclodextrin embedded in a polyelectrolyte multilayerProceedings of the National Academy of Sciences of the United States of America, 2006
- Charge-Controlled Permeability of Polyelectrolyte MicrocapsulesThe Journal of Physical Chemistry B, 2005
- Disintegration of Layer-by-Layer Assemblies Composed of 2-Iminobiotin-Labeled Poly(ethyleneimine) and AvidinBiomacromolecules, 2004
- Highly Flexible Polyelectrolyte NanotubesJournal of the American Chemical Society, 2003
- Production of Hollow Polymeric Microspheres by Surface-Confined Living Radical Polymerization on Silica TemplatesChemistry of Materials, 2000