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Antisense oligonucleotides

P Herdewijn1

  • 1Rega Instituut Katholieke Universiteit Leuven.

Verhandelingen - Koninklijke Academie Voor Geneeskunde Van Belgie
|January 1, 1996
PubMed
Summary

Modified antisense oligonucleotides with 3'-end aliphatic diols show enhanced stability and potent antiproliferative effects against tumor cells. These nuclease-resistant constructs offer a promising therapeutic strategy for cancers with Ha-ras oncogene mutations.

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Area of Science:

  • Oligonucleotide chemistry
  • Antisense therapeutics
  • Cancer biology

Background:

  • Natural phosphodiester oligonucleotides are ideal antisense agents but suffer from nuclease degradation and poor cellular uptake.
  • Conjugation chemistry offers a route to enhance oligonucleotide stability and delivery for therapeutic applications.

Purpose of the Study:

  • To identify minimal molecular modifications to create nuclease-stable, cell-permeable antisense oligonucleotides with selective antiproliferative activity.
  • To evaluate the therapeutic potential of modified oligonucleotides against Ha-ras-driven cancers.

Main Methods:

  • Investigated the effect of 3 zost-end aliphatic diol conjugation on phosphodiester oligonucleotide stability and cellular uptake.
  • Assessed the antiproliferative activity of modified oligonucleotides in tumor cells expressing mutated Ha-ras.

Main Results:

  • Small aliphatic diols conjugated at the 3 zost-end conferred nuclease stability and potent, selective antiproliferative effects.
  • A 1,3-propanediol modified 12-mer targeting Ha-ras codon 12 demonstrated significant activity at nanomolar concentrations.
  • Modified oligonucleotides exhibited low toxicity, suggesting a favorable safety profile.

Conclusions:

  • 3 zost-end aliphatic diol modification is an effective strategy to develop nuclease-resistant antisense oligonucleotides.
  • These modified oligonucleotides show promise as targeted anticancer therapeutics, particularly for Ha-ras-mutated cancers.
  • The cost-effective synthesis and low toxicity support further development as affordable cancer drugs.

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