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Bromodeoxyuridine-labeled oligonucleotides as tools for oligonucleotide uptake studies

Maria Maszewska1, Anna Kobylańska, Edyta Gendaszewska-Darmach

  • 1Department of Bioorganic Chemistry, Centre of Molecular and Macromolecular Studies, Polish Academy of Sciences, 90-363 Lódź, Sienkiewicza 112, Poland. maszewsk@bio.cbmm.lodz.pl

Antisense & Nucleic Acid Drug Development
|February 6, 2003
PubMed

Insights

This study introduces a new immunofluorescent method to track oligonucleotide (ODN) cellular uptake without altering their properties. The technique reveals how modifications and sequences affect ODN delivery, offering a more accurate understanding of cellular entry mechanisms.

Area of Science:

  • Molecular Biology
  • Cell Biology
  • Biochemistry

Background:

  • Cellular uptake mechanisms for oligonucleotides (ODNs) remain incompletely understood.
  • Traditional fluorescent labeling of ODNs can alter their physicochemical properties, potentially affecting cellular interactions and uptake efficiency.
  • A need exists for methods that accurately assess ODN cellular entry without artifact.

Purpose of the Study:

  • To develop and validate an alternative method for detecting cellular uptake of ODNs.
  • To investigate the influence of chemical modifications (e.g., cholesterol, menthol conjugation) and sequence-dependent structures on ODN cellular internalization.
  • To compare the cellular uptake of different ODN backbone types, specifically phosphodiester (PO) and phosphorothioate (PS) ODNs.

Main Methods:

  • Incorporation of 5-bromo-2'-deoxyuridine (BrdUrd) into ODNs as a detectable label.
  • Immunofluorescent detection of BrdUrd-modified ODNs using FITC-labeled anti-BrdUrd antibodies.
  • Application of this immunocytochemical method to study cellular uptake of various ODN analogs, including PO and PS ODNs with cholesterol and menthol conjugates.

Main Results:

  • The BrdUrd-based immunofluorescent method successfully localized ODNs within cells, providing an alternative to direct fluorochrome labeling.
  • The study determined differences in cellular uptake between phosphodiester (PO) and phosphorothioate (PS) ODNs and their cholesterol/menthol-conjugated derivatives.
  • Evidence suggests that specific sequences, capable of forming higher-order structures, can influence the cellular uptake of certain ODNs.

Conclusions:

  • Immunofluorescent detection of incorporated BrdUrd offers a robust method for studying ODN cellular uptake without the artifacts associated with traditional fluorescent labeling.
  • The cellular internalization of ODNs is influenced by their chemical modifications, backbone structure, and sequence-dependent structural properties.
  • This technique provides valuable insights into the complex mechanisms governing ODN delivery into cells.

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