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Related Experiment Videos

Thermosensitive polymers as carriers for DNA delivery.

W L Hinrichs1, N M Schuurmans-Nieuwenbroek, P van de Wetering

  • 1Department of Pharmaceutics, Utrecht Institute for Pharmaceutical Sciences, Faculty of Pharmacy, Utrecht University, P.O. Box 80.082, 3508 TB, Utrecht, The Netherlands.

Journal of Controlled Release : Official Journal of the Controlled Release Society
|July 30, 1999
PubMed
Summary

Copolymers of 2-(dimethylamino) ethyl methacrylate (DMAEMA) and N-isopropylacryl amide (NIPAAm) form stable DNA complexes around 200 nm. Higher NIPAAm content reduces cytotoxicity and improves stability, crucial for efficient gene delivery.

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Area of Science:

  • Polymer Chemistry
  • Biomaterials Science
  • Gene Delivery Systems

Background:

  • Developing effective non-viral vectors for DNA delivery is crucial for gene therapy.
  • Copolymers offer tunable properties for optimizing gene carrier performance.
  • Understanding the relationship between copolymer composition, complex formation, and transfection efficiency is essential.

Purpose of the Study:

  • To evaluate copolymers of DMAEMA and NIPAAm as DNA delivery carriers.
  • To investigate the impact of monomer ratio and molecular weight on complex formation, stability, and transfection efficiency.
  • To identify key characteristics for predicting the performance of these copolymer/plasmid complexes.

Main Methods:

  • Synthesis of DMAEMA/NIPAAm copolymers with varying monomer ratios and molecular weights.

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  • DNA binding and complexation studies using light scattering and zeta potential measurements.
  • Assessment of complex stability at physiological temperature (37°C).
  • Evaluation of cytotoxicity and transfection efficiency in vitro.

    • Main Results:

    • DMAEMA/NIPAAm copolymers effectively bind DNA, forming complexes around 200 nm.
    • Complex stability at 37°C increases with higher molecular weight and NIPAAm content.
    • Transfection efficiency correlates positively with complex stability and zeta potential.
    • Cytotoxicity significantly decreases with increasing NIPAAm content.

    Conclusions:

    • Stable, ~200 nm copolymer/plasmid complexes are necessary for efficient gene transfection.
    • Zeta potential, alongside size, can predict complex behavior in transfection.
    • DMAEMA/NIPAAm copolymers show promise as low-cytotoxicity gene delivery vectors, especially with added targeting functionalities.