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Related Experiment Videos

Cell transfection with polycationic cyclodextrin vectors.

Sally-Ann Cryan1, Ann Holohan, Ruth Donohue

  • 1Department of Pharmaceutics and Pharmaceutical Technology, Trinity College, University of Dublin, Dublin 2, Ireland.

European Journal of Pharmaceutical Sciences : Official Journal of the European Federation for Pharmaceutical Sciences
|April 7, 2004
PubMed
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Polycationic cyclodextrins (CDs) show promise as gene delivery vectors. Modified CDs effectively complexed plasmid DNA, significantly enhancing cellular uptake and transfection efficiency in COS-7 cells.

Area of Science:

  • Biotechnology and Genetic Engineering
  • Materials Science
  • Cell Biology

Background:

  • Gene delivery vectors are crucial for genetic therapies.
  • Cyclodextrins (CDs) are versatile cyclic oligosaccharides with potential for modification.
  • Developing non-viral vectors with high transfection efficiency and low toxicity is a key challenge.

Purpose of the Study:

  • To synthesize and characterize polycationic cyclodextrins (CDs) as potential gene delivery vectors.
  • To evaluate the DNA complexation and transfection efficiency of modified CDs in COS-7 cells.
  • To investigate the role of CD substituents and cellular uptake mechanisms in gene delivery.

Main Methods:

  • Synthesis of various polycationic cyclodextrins (CDs) with different substituents at the 6-position.

Related Experiment Videos

  • Complexation of plasmid DNA with CDs to form nanoparticulate structures.
  • Transfection assays in COS-7 cells, including studies with chloroquine and serum.
  • Cellular uptake studies using 32P-labelled plasmid DNA.

    • Main Results:

    • Polycationic CDs formed stable nanoparticulate complexes with plasmid DNA, unlike uncharged CDs.
    • Transfection efficiency varied with CD substituents; pyridylamino and butylimidazole groups showed high efficacy.
    • Heptakispyridylamino CD achieved a 4000-fold increase in transfection over DNA alone, comparable to DOTAP in serum.
    • CDs significantly enhanced DNA cellular uptake, mediated by proteoglycan binding.

    Conclusions:

    • Polycationic cyclodextrins are effective non-viral gene delivery vectors.
    • CD modification allows tuning of transfection efficiency and cellular uptake.
    • Intracellular trafficking, not cellular uptake, may be the rate-limiting step in CD-mediated gene delivery.
    • CDs serve as promising scaffolds for developing advanced gene delivery systems.