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Anionic Polymerization of an Amphiphilic Copolymer for Preparation of Block Copolymer Micelles Stabilized by π-π Stacking Interactions
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Mixed Polyplex Micelles with Thermoresponsive and Lysine-Based Zwitterionic Shells Derived from Two Poly(vinyl
Ryosuke Kanto1, Ryo Yonenuma1, Mizuki Yamamoto2
1Graduate School of Organic Materials Science, Yamagata University, 4-3-16, Jonan, Yonezawa 992-8510, Japan.
Langmuir : the ACS Journal of Surfaces and Colloids
|March 2, 2021
Summary
Novel poly(vinyl amine) block copolymers form DNA polyplex micelles with tunable properties. These materials exhibit stimuli-responsive behavior and enhanced stability, showing promise for gene delivery applications.
Area of Science:
- Polymer Chemistry
- Materials Science
- Biotechnology
Background:
- Development of advanced polymer architectures for gene delivery.
- Need for stimuli-responsive and stable polyplexes for efficient DNA complexation.
Purpose of the Study:
- Synthesize and characterize poly(vinyl amine)-based block copolymers.
- Investigate the formation and properties of mixed polyplex micelles with DNA.
- Evaluate the stimuli-responsive and stability characteristics of the polyplexes.
Main Methods:
- Reversible addition-fragmentation chain transfer (RAFT) polymerization for copolymer synthesis.
- Dynamic light scattering, zeta potential, circular dichroism, gel electrophoresis, AFM, and TEM for characterization.
- Evaluation of DNA binding, polyplex assembly, and stability under various conditions (temperature, salt).
Main Results:
- Successful synthesis of poly(vinyl amine)-based block copolymers with zwitterionic (poly(N-acryloyl-l-lysine)) and thermoresponsive (poly(N-isopropylacrylamide)) segments.
- Formation of DNA polyplex micelles with low cytotoxicity and stimuli-responsive properties.
- PVAm-b-PNIPAM polyplexes show temperature-induced assembly governed by N/P ratio; PVAm-b-PALysOH polyplexes exhibit tunable DNA binding and stability.
- Mixed polyplex micelles demonstrate temperature-induced stability and remarkable salt tolerance.
Conclusions:
- Poly(vinyl amine)-based block copolymers offer versatile platforms for creating functional DNA polyplexes.
- The combination of zwitterionic and thermoresponsive segments provides tunable stability and stimuli-responsiveness.
- These materials show significant potential for advanced gene delivery systems.
