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Inhibition of NF-κB activation sensitizes U937 cells to 3'-azido-3'-deoxythymidine induced apoptosis

C Matteucci1, A Minutolo, E Balestrieri

  • 1Department of Experimental Medicine and Biochemical Sciences, University of Rome 'Tor Vergata', Italy.

Cell Death & Disease
|March 4, 2011
PubMed

Insights

Azidothymidine (AZT) treatment activates nuclear factor-kappa B (NF-κB), a mechanism that protects cells from apoptosis. Inhibiting NF-κB increases AZT-induced cell death, revealing its role in drug toxicology.

Area of Science:

  • Molecular Biology
  • Cell Biology
  • Pharmacology

Background:

  • Azidothymidine (AZT) is a nucleoside analog used in antiviral therapy.
  • Understanding the molecular mechanisms of AZT-induced apoptosis is crucial for its therapeutic application and toxicology.
  • Nuclear Factor-kappa B (NF-κB) is a key transcription factor involved in cellular responses, including apoptosis.

Purpose of the Study:

  • To investigate the molecular mechanisms behind the low susceptibility to apoptosis induced by AZT.
  • To elucidate the role of Nuclear Factor-kappa B (NF-κB) activation in AZT-induced apoptosis.
  • To explore the implications for AZT's therapeutic use and toxicology.

Main Methods:

  • Utilized U937 monocytic cell line for apoptosis studies.
  • Performed SuperArray analysis to assess gene transcriptional activity.
  • Investigated NF-κB activation using binding assays and dominant-negative IκBα transfection.
  • Employed pharmacological treatments to inhibit NF-κB activation.

Main Results:

  • AZT treatment induced moderate apoptosis in U937 cells, even at high concentrations.
  • AZT modulated the transcriptional activity of both pro- and anti-apoptotic genes.
  • AZT induced a transient but significant increase in NF-κB binding activity.
  • Inhibition of NF-κB sensitized cells to AZT-induced apoptosis and impaired anti-apoptotic gene upregulation.

Conclusions:

  • NF-κB activation by AZT plays a protective role against apoptosis.
  • This finding enhances the understanding of AZT's toxicology.
  • The study provides insights into the therapeutic usage of AZT.

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