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Optimization of precision nanofiber micelleplexes for DNA delivery
Steven T G Street1,2,3, Hayley C Parkin2,3, Lennard Shopperly4,5
1School of Chemistry, University of Bristol, Bristol BS8 1TS, UK.
Novel nanofiber micelleplexes show promise for nucleic acid (NA) delivery. Studies reveal key parameters influencing their stability and transfection efficiency for advanced gene therapy applications.
Area of Science:
- Biomaterials Science
- Nanotechnology
- Gene Therapy
Background:
- Nucleic acid (NA) technologies are transforming medicine, necessitating efficient cellular delivery systems.
- Polymeric micelleplexes, particularly nanofiber variants, are emerging as promising NA delivery vehicles.
- Understanding factors affecting micelleplex performance is crucial for optimizing gene delivery.
Purpose of the Study:
- To compare poly(fluorenetrimethylenecarbonate)-b-poly(2-(dimethylamino)ethyl methacrylate) (PFTMC-b-PDMAEMA) nanofiber micelleplexes with nanosphere micelleplexes and PDMAEMA polyplexes.
- To investigate the impact of complexation buffer, temporal/serum stability, cell density, cell type, and polymer degree of polymerization (DP) on transfection efficiency and cell viability.
- To provide insights for designing improved polymeric NA delivery systems.
Main Methods:
- Synthesis and characterization of PFTMC-b-PDMAEMA nanofiber micelleplexes.
- Comparative transfection studies using different micelleplex/polyplex formulations.
- Evaluation of micelleplex stability under various conditions (temporal, serum).
- Assessment of transfection efficiency and cell viability across different cell densities and types, and varying polymer DPs.
Main Results:
- PFTMC-b-PDMAEMA nanofiber micelleplexes demonstrated comparable or superior performance to other formulations under specific conditions.
- Complexation buffer, cell density, and cell type significantly influenced transfection efficiency.
- Temporal and serum stability studies provided critical data on micelleplex longevity and robustness.
- Polymer DP was identified as a key factor modulating both transfection and cytotoxicity.
Conclusions:
- Nanofiber micelleplexes represent a viable platform for plasmid DNA delivery.
- Optimization of formulation and delivery parameters is essential for maximizing therapeutic efficacy.
- This research provides a foundational understanding for the rational design of next-generation polymeric nucleic acid delivery vehicles.
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