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Suppression of TNF-alpha-induced apoptosis by NF-kappaB

D J Van Antwerp1, S J Martin, T Kafri

  • 1Laboratory of Genetics, Salk Institute, La Jolla, CA 92037, USA. Jolla Institute for Allergy and Immu.

Science (New York, N.Y.)
|November 1, 1996
PubMed

Insights

Tumor necrosis factor alpha (TNF-alpha) signaling activates NF-kappaB and apoptosis. Enhanced apoptosis in cells with IkappaBalphaM suggests NF-kappaB activation suppresses cell death signals.

Area of Science:

  • Cellular biology
  • Molecular signaling pathways

Background:

  • Tumor necrosis factor alpha (TNF-alpha) signaling triggers key cellular events like NF-kappaB activation and apoptosis.
  • Previous research indicated independent pathways for TNF-alpha-induced NF-kappaB activation and apoptosis.

Purpose of the Study:

  • To investigate the relationship between TNF-alpha signaling, NF-kappaB activation, and apoptosis.
  • To explore the role of IkappaBalpha in modulating TNF-alpha-induced cell death.

Main Methods:

  • Utilized cell types expressing a dominant-negative IkappaBalpha (IkappaBalphaM).
  • Analyzed the sensitivity and kinetics of TNF-alpha-induced apoptosis in these cells.

Main Results:

  • Cells expressing IkappaBalphaM exhibited enhanced sensitivity and altered kinetics of TNF-alpha-induced apoptosis.
  • The findings indicate that NF-kappaB activation influences the apoptotic response to TNF-alpha.

Conclusions:

  • TNF-alpha signaling involves a negative feedback loop where NF-kappaB activation suppresses cell death signals.
  • IkappaBalpha plays a crucial role in this feedback mechanism, modulating apoptosis sensitivity.

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