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Assembly and Characterization of Polyelectrolyte Complex Micelles
Published on: March 2, 2020
Poly(trehalose): sugar-coated nanocomplexes promote stabilization and effective polyplex-mediated siRNA delivery
Antons Sizovs1, Lian Xue, Zachary P Tolstyka
1Department of Chemistry and Macromolecules and Interfaces Institute, Virginia Tech , Blacksburg, Virginia 24060, United States.
Journal of the American Chemical Society
|October 3, 2013
Summary
Poly(trehalose) coatings enhance nanoparticle stability and cellular uptake for siRNA delivery. This novel polymer protects nucleic acids during freeze-drying and improves therapeutic gene silencing in glioblastoma cells with low toxicity.
Area of Science:
- Materials Science
- Biotechnology
- Polymer Chemistry
Background:
- Nanoparticle surface properties dictate environmental interactions.
- Trehalose, a disaccharide, offers unique biological stabilization effects.
- Developing novel polymers for enhanced nanoparticle functionality is crucial for nanomedicine.
Purpose of the Study:
- To synthesize and characterize poly(methacrylamidotrehalose) (poly(trehalose)) and its diblock copolycations with aminoethylmethacrylamide (AEMA).
- To evaluate the efficacy of poly(trehalose) coatings in stabilizing siRNA polyplexes and facilitating cellular internalization.
- To assess the potential of poly(trehalose) as a component in therapeutic nanoparticle formulations.
Main Methods:
- Synthesis of poly(trehalose) and AEMA-based diblock copolycations.
- Assessment of colloidal stability of siRNA polyplexes in high salt and serum conditions.
- Evaluation of freeze-drying protection and resuspension of siRNA polyplexes.
- Confocal microscopy to study cellular internalization and trafficking of poly(trehalose)-coated polyplexes.
- Determination of siRNA-induced gene down-regulation and IC50 values.
Main Results:
- Poly(trehalose) coatings ensure colloidal stability of siRNA polyplexes under challenging conditions.
- The polymer protects siRNA polyplexes during freeze-drying, allowing complete resuspension without functional loss.
- siRNA polyplexes coated with poly(trehalose) exhibit efficient cellular internalization into glioblastoma cells via zero-order kinetics.
- Controlled siRNA delivery and significant target gene down-regulation (IC50 = 19 nM) were achieved.
- Negligible cytotoxicity was observed for the poly(trehalose)-coated nanoparticles.
Conclusions:
- Poly(trehalose) is a promising polymer for stabilizing therapeutic nanoparticle formulations.
- The coating enhances cellular uptake and delivery of nucleic acids.
- Poly(trehalose) shows potential for nanomedicine applications, including nucleic acid delivery and other nanobased technologies.
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