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Nano-polyplexes from a cationic modification of poly(γ-glutamic acid).

Porochista Dorost1, Montserrat García-Alvarez1, Antxon Martínez de Ilarduya1

  • 1Departament d'Enginyeria Química, Universitat Politècnica de Catalunya, ETSEIB, Barcelona, Spain.

Journal of Biomaterials Science. Polymer Edition
|July 8, 2025
PubMed
Summary

Researchers developed a new cationic biopolymer from poly(γ-glutamic acid) for efficient DNA delivery. This modified polymer shows enhanced DNA binding and stable nanoaggregate formation, crucial for gene therapy applications.

Keywords:
DNA deliveryPoly(γ-glutamic acid)polycationspolyplexeszwitterionic copolymers

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Area of Science:

  • Biomaterials Science
  • Polymer Chemistry
  • Gene Delivery Systems

Background:

  • Biodegradable and biocompatible polymers are essential for advanced biomedical applications.
  • Developing efficient and stable non-viral gene delivery vectors remains a significant challenge.
  • Poly(γ-glutamic acid) (PGGAH) offers a promising scaffold for polymer modification due to its inherent safety profile.

Purpose of the Study:

  • To synthesize and characterize novel cationic copolymers derived from poly(γ-glutamic acid) (PGGAH).
  • To investigate the impact of varying cationic group incorporation on polymer properties and DNA binding.
  • To evaluate the potential of these new materials as efficient DNA delivery systems.

Main Methods:

  • Synthesis of PGGAHxTMEAy copolymers via partial esterification of PGGAH with 2-bromoethyl trimethylammonium bromide (BrETABr).
  • Characterization using 1H NMR, FTIR, TGA, and GPC.
  • Assessment of DNA complexation and polyplex formation using dynamic light scattering (DLS) at various N/P ratios.
  • Monitoring of polyplex stability, size, and surface charge over two weeks.

Main Results:

  • Cationic copolymers (PGGAHxTMEAy) with 11-95% cationic group incorporation were successfully synthesized.
  • Degree of esterification significantly influenced thermal stability and DNA-binding capacity.
  • Higher modification levels enhanced DNA complexation, forming stable polyplex nanoaggregates (80-220 nm).
  • Polyplexes exhibited enhanced stability and consistent particle sizes over time, particularly with higher modification degrees.

Conclusions:

  • Novel cationic poly(γ-glutamic acid) derivatives were developed with tunable properties for DNA delivery.
  • The degree of cationic modification is a critical factor for optimizing DNA binding and polyplex stability.
  • These findings highlight the potential of modified PGGAH as a promising platform for developing efficient and stable non-viral gene delivery vectors.