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Related Experiment Videos

Antisense delivery using protamine-oligonucleotide particles.

M Junghans1, J Kreuter, A Zimmer

  • 1Institut für Pharmazeutische Technologie, Johann Wolfgang Goethe Universität, Biozentrum, Marie Curie Strasse 9, 60439 Frankfurt am Main, Germany.

Nucleic Acids Research
|April 25, 2000
PubMed
Summary
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Protamine forms nanoparticles called proticles, enhancing cellular uptake of antisense oligonucleotides (ODNs). These proticles significantly reduced cancer cell growth in proliferation assays.

Area of Science:

  • Biotechnology
  • Molecular Biology
  • Pharmacology

Background:

  • Antisense oligonucleotides (ODNs) are a promising therapeutic class but face challenges in cellular delivery.
  • Polycationic peptides are being explored as agents to improve nucleic acid delivery.
  • Protamine, a readily available polycationic peptide, has potential as a delivery vehicle.

Purpose of the Study:

  • To evaluate protamine as a penetration enhancer for phosphodiester antisense oligonucleotides (ODNs).
  • To characterize the formed protamine-ODN complexes, termed 'proticles'.
  • To assess the stability and cellular uptake of ODN-proticle complexes and their therapeutic effect.

Main Methods:

  • Spontaneous formation and characterization of protamine-ODN nanoparticles ('proticles').

Related Experiment Videos

  • Stability assessment of proticles in fetal calf serum and cell culture medium.
  • Cellular uptake studies using FITC-labelled ODNs in U 937 cells.
  • Cell proliferation assays using ODNs targeting the c-myc proto-oncogene.

    • Main Results:

    • Protamine spontaneously formed nanoparticles ('proticles') with ODNs.
    • Proticles demonstrated stability in biological media.
    • FITC-labelled ODNs complexed with protamine showed significantly increased cellular uptake in U 937 cells compared to free ODNs.
    • Proticles significantly inhibited cellular growth in proliferation assays.

    Conclusions:

    • Protamine effectively forms stable nanoparticles ('proticles') with ODNs.
    • Proticles enhance the cellular uptake of ODNs.
    • Proticles demonstrate therapeutic potential by inhibiting cancer cell proliferation.