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Updated: May 25, 2026

Preparation of Stable Bicyclic Aziridinium Ions and Their Ring-Opening for the Synthesis of Azaheterocycles
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Published on: August 22, 2018

Development of an oral form of azacytidine: 2'3'5'triacetyl-5-azacytidine

Amy Ziemba1, Eugene Hayes, Burgess B Freeman

  • 1Nevada Cancer Institute, One Breakthough Way, Las Vegas, NV 89135, USA.

Chemotherapy Research and Practice
|February 2, 2012
PubMed

Insights

This study introduces a new azacitidine prodrug, TAC, for treating myelodysplastic syndromes (MDS). TAC shows improved bioavailability and reduced toxicity, offering a promising oral option for MDS patients.

Area of Science:

  • Oncology
  • Pharmacology
  • Epigenetics

Background:

  • Myelodysplastic syndromes (MDS) are incurable stem-cell malignancies often treated with supportive care.
  • Epigenetic silencing via promoter methylation in MDS predicts transformation to acute myeloid leukemia (AML).
  • Current DNA methyltransferase (DNMT) inhibitors like azacitidine have limited oral bioavailability, complicating clinical use.

Purpose of the Study:

  • To evaluate 2', 3', 5'-triacetyl-5-azacitidine (TAC) as a potential oral prodrug for azacitidine.
  • To assess TAC's pharmacokinetic properties, in vivo toxicity, and efficacy in preclinical models.
  • To determine TAC's pharmacodynamic effects on global methylation.

Main Methods:

  • Synthesis and characterization of the azacitidine prodrug, TAC.
  • Pharmacokinetic studies to assess bioavailability, solubility, and stability of TAC compared to azacitidine.
  • In vivo toxicity and survival studies in relevant animal models.
  • Pharmacodynamic assessment of global DNA methylation suppression.

Main Results:

  • TAC demonstrated significant improvements in bioavailability, solubility, and stability over azacitidine.
  • In vivo studies showed a lack of general toxicity and significantly improved survival rates with TAC.
  • Pharmacodynamic analyses confirmed TAC's ability to suppress global methylation in vivo.

Conclusions:

  • Esterified nucleoside derivatives, such as TAC, show potential as effective prodrugs for azacitidine.
  • TAC exhibits promising preclinical data regarding safety, efficacy, and pharmacokinetics.
  • Further investigation into TAC's metabolism, activity, and clinical evaluation is warranted for MDS treatment.

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