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Tumor necrosis factor alpha induction of NF-kappaB requires the novel coactivator SIMPL

Hyung-Joo Kwon1, Erin Haag Breese, Eva Vig-Varga

  • 1Department of Biochemistry and Molecular Biology, 635 Barnhill Dr., MS 4071, Indianapolis, IN 46202-5122, USA.

Molecular and Cellular Biology
|October 16, 2004
PubMed

Insights

Signaling molecule that interacts with mouse pelle-like kinase (SIMPL) is crucial for tumor necrosis factor alpha (TNF-alpha)-induced NF-kappaB activation. Nuclear SIMPL and p65 interaction promotes TNF-alpha-specific gene expression.

Area of Science:

  • Molecular Biology
  • Cell Signaling
  • Immunology

Background:

  • Nuclear factor-kappa B (NF-kappaB) activation is a key cellular response to various stimuli.
  • The precise mechanisms tailoring NF-kappaB responses to specific insults remain incompletely understood.
  • Signaling molecule that interacts with mouse pelle-like kinase (SIMPL) is implicated in tumor necrosis factor alpha (TNF-alpha)-dependent NF-kappaB activation.

Purpose of the Study:

  • To elucidate the role of SIMPL in TNF-alpha-induced NF-kappaB activation.
  • To investigate the requirement of SIMPL nuclear localization for NF-kappaB activity.
  • To determine how SIMPL contributes to TNF-alpha-specific gene expression.

Main Methods:

  • Investigated SIMPL's role in TNF-alpha and interleukin-1 signaling pathways.
  • Assessed the impact of SIMPL nuclear localization on NF-kappaB activity.
  • Examined the interaction between SIMPL and p65 in the nucleus following TNF-alpha stimulation.

Main Results:

  • Nuclear localization of SIMPL is essential for type I TNF receptor-induced NF-kappaB activity.
  • SIMPL interacts with nuclear p65 in a TNF-alpha-dependent manner.
  • The SIMPL-p65 interaction enhances p65 transactivation activity, promoting NF-kappaB-dependent gene expression.

Conclusions:

  • TNF-alpha-induced NF-kappaB-dependent gene expression requires the nuclear relocalization of both p65 and SIMPL.
  • SIMPL plays a critical role in generating a TNF-alpha-specific induction of gene expression.
  • These findings provide insights into the specificity of NF-kappaB signaling pathways.

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