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Cellular proteins prevent antisense phosphorothioate oligonucleotide (SdT18) to target sense RNA (rA18): development

I Brukner1, G A Tremblay

  • 1Département de Biochimie, Université de Montréal, C.P. 6128, succursale Centre-ville, Montréal, Québec, Canada. ibrukner@hotmail.com

Biochemistry
|September 14, 2000
PubMed

Insights

Cellular proteins hinder antisense oligonucleotides (ASOs) from targeting RNA. This suggests phosphorothioate ASOs may work via an "aptamer" effect, not just antisense mechanisms.

Area of Science:

  • Molecular Biology
  • Oligonucleotide Therapeutics

Background:

  • Antisense oligonucleotides (ASOs) are therapeutic agents targeting RNA.
  • The role of cellular protein interactions with ASOs is often overlooked.
  • The "antisense" mechanism alone may not fully explain ASO efficacy in cells.

Purpose of the Study:

  • To investigate the impact of cellular proteins on the RNA-targeting ability of antisense oligonucleotides.
  • To compare the efficacy of phosphorothioate (SdT) and natural deoxyoligonucleotides (dT) in the presence of cellular proteins.
  • To explore the potential for an "aptamer" effect in phosphorothioate ASO activity.

Main Methods:

  • Utilized a nuclease digestion assay to detect RNA/ASO hybrid formation.
  • Tested RNA targeting in the presence and absence of cellular proteins.
  • Used phosphorothioate (SdT18) and natural deoxyoligonucleotides (dT18) against a target RNA (rA18).

Main Results:

  • Cellular proteins significantly inhibited the ability of phosphorothioate oligonucleotides (SdT18) to form hybrids with target RNA (rA18) in vitro.
  • RNA targeting by SdT18 was successful in the absence of proteins, consistent with standard in vitro assays.
  • Even with diluted protein extract and high target RNA concentrations, protein presence blocked SdT18 binding.

Conclusions:

  • Affinity for cellular proteins is a critical factor influencing the success of RNA targeting by ASOs.
  • The observed inhibition by proteins suggests that the therapeutic effects of phosphorothioates might stem from an "aptamer" effect rather than solely the antisense mechanism.
  • Further research is needed to elucidate the precise mechanisms of ASO action, considering protein interactions.

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