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Preparation and Characterization of Individual and Multi-drug Loaded Physically Entrapped Polymeric Micelles
Published on: August 28, 2015
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Core-crosslinked, temperature- and pH-responsive micelles: design, physicochemical characterization, and gene
Katharina Leer1,2, Gizem Cinar1,2, Jana I Solomun1,2
1Laboratory of Organic and Macromolecular Chemistry (IOMC), Friedrich Schiller University Jena, Humboldtstrasse 10, 07743 Jena, Germany. Ivo.nischang@uni-jena.de.
Nanoscale
|September 30, 2021
Summary
Stimuli-responsive block copolymer micelles enhance gene delivery. Core-crosslinking significantly boosted transfection efficiency by 13-fold, demonstrating a promising platform for genetic material delivery.
Area of Science:
- Polymer Chemistry
- Biomaterials Science
- Nanotechnology
Background:
- Stimuli-responsive block copolymer micelles offer tunable properties for effective genetic material delivery.
- Temperature- and pH-responsive polymers are crucial for optimizing gene delivery systems.
- Existing systems require enhanced stability and efficiency for practical applications.
Purpose of the Study:
- To design and characterize a novel stimuli-responsive micelle system for gene delivery.
- To investigate the impact of core-crosslinking on micelle stability and gene delivery efficiency.
- To evaluate the physicochemical properties and biological performance of the developed system.
Main Methods:
- Synthesis of a diblock copolymer comprising poly(N,N-diethylacrylamide) (PDEAm) and poly(aminoethyl acrylamide) (PAEAm) with incorporated disulfide crosslinking units.
- Characterization of micelle formation and stability using turbidimetry, fluorescence spectroscopy, dynamic light scattering (DLS), and analytical ultracentrifuge (AUC).
- Evaluation of gene delivery efficacy in HEK293T cells, including cytotoxicity, pDNA binding, and transfection efficiency.
Main Results:
- The diblock copolymer formed temperature- and pH-responsive micelles.
- Disulfide crosslinking of the micelle core enhanced structural stability.
- Core-crosslinked micelles demonstrated a 13-fold increase in transfection efficiency compared to non-crosslinked micelles.
- The system exhibited low cytotoxicity and effective pDNA binding.
Conclusions:
- The developed stimuli-responsive, core-crosslinked micelles represent a highly efficient and stable platform for gene delivery.
- The combination of temperature/pH responsiveness and disulfide crosslinking provides a versatile approach for optimizing gene delivery vectors.
- This study provides a comprehensive framework for the development and application of advanced polymeric gene delivery systems.
