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Adriamycin activates NF-kappaB in human lung carcinoma cells by IkappaBalpha degradation

Maud Andriollo1, Alain Favier, Pascale Guiraud

  • 1Laboratoire de Biologie du Stress Oxydant, MNERT JE538 CEA LRC 8M, Faculté de Pharmacie, Université Joseph Fourier, Grenoble, France. Maud.Andriollo@ujf-grenoble.fr

Archives of Biochemistry and Biophysics
|April 23, 2003
PubMed

Insights

Adriamycin (ADR) activates NF-kappaB signaling only in ADR-sensitive small-cell lung cancer cells, not resistant ones. This suggests NF-kappaB is not involved in ADR resistance mechanisms.

Area of Science:

  • Oncology
  • Molecular Biology
  • Pharmacology

Background:

  • Adriamycin (ADR) is a chemotherapy drug used to treat small-cell lung carcinoma.
  • Understanding the mechanisms of ADR resistance is crucial for improving treatment efficacy.
  • Nuclear factor-kappa B (NF-kappaB) is a transcription factor involved in various cellular processes, including inflammation and cancer.

Purpose of the Study:

  • To investigate the effect of adriamycin (ADR) on NF-kappaB signaling activation in ADR-sensitive and ADR-resistant GLC(4) human small-cell lung carcinoma cells.
  • To determine if NF-kappaB plays a role in ADR resistance.

Main Methods:

  • Utilized GLC(4) human small-cell lung carcinoma cell lines, both ADR-sensitive and ADR-resistant.
  • Administered ADR and measured NF-kappaB activation.
  • Assessed IkappaBalpha degradation and Topoisomerase II levels.
  • Evaluated NF-kappaB activation in response to tumor necrosis factor (TNF).
  • Investigated the activation of transcription factor Sp1.

Main Results:

  • ADR activated NF-kappaB in a time- and dose-dependent manner exclusively in ADR-sensitive GLC(4) cells, occurring after 4 hours via IkappaBalpha degradation.
  • NF-kappaB activation by TNF remained intact in both sensitive and resistant cell lines.
  • ADR treatment depleted Topoisomerase II in both cell types, indicating stabilization of DNA-topoisomerase II complexes.
  • ADR also activated the transcription factor Sp1, suggesting non-specific activation pathways in sensitive cells.

Conclusions:

  • NF-kappaB transcription factor activation is specific to ADR-sensitive GLC(4) cells and is not the mechanism underlying ADR resistance.
  • The findings highlight differential signaling responses to ADR based on cellular sensitivity.
  • Topoisomerase II depletion and Sp1 activation represent other cellular events influenced by ADR treatment.

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