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A cell cycle regulatory network controlling NF-kappaB subunit activity and function.

Benjamin Barré1, Neil D Perkins

  • 1Division of Gene Regulation and Expression, College of Life Sciences, University of Dundee, Dundee, Scotland, UK.

The EMBO Journal
|October 27, 2007
PubMed
Summary
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Aberrantly active Nuclear Factor-kappa B (NF-kappaB) drives cancer by controlling cell growth. This study reveals how NF-kappaB interacts with cell cycle regulators like Akt and Chk1 to control key cancer-promoting genes.

Area of Science:

  • Molecular Biology
  • Cell Biology
  • Cancer Research

Background:

  • Aberrant Nuclear Factor-kappa B (NF-kappaB) signaling is implicated in tumorigenesis.
  • NF-kappaB regulates genes essential for cancer cell growth and survival.

Purpose of the Study:

  • To investigate the regulation of NF-kappaB activity during the cell cycle.
  • To elucidate the roles of IkappaB kinase (IKK)alpha, IKKbeta, Akt, and Chk1 in controlling NF-kappaB's regulation of cell cycle genes.

Main Methods:

  • Analysis of NF-kappaB subunit binding dynamics to proto-oncogene promoters (Cyclin D1, c-Myc, Skp2) across cell cycle phases.
  • Assessment of RelA(p65) phosphorylation and coactivator/corepressor recruitment.
  • Investigation of the interplay between Akt, Chk1, IKKs, and NF-kappaB processing (p100).

Related Experiment Videos

Main Results:

  • NF-kappaB promoter binding and RelA(p65) phosphorylation change dynamically through G1, S, and G2 phases.
  • Akt activity is crucial for IKK-mediated NF-kappaB phosphorylation in G1/G2, while Chk1 is inactive.
  • In S-phase, Chk1 activation inhibits p100 processing by associating with IKKalpha, impacting gene regulation.

Conclusions:

  • A complex regulatory network integrates NF-kappaB with the DNA replication checkpoint.
  • The coordinated action of IKKs, Akt, and Chk1 modulates NF-kappaB activity to control cell proliferation genes.
  • This provides insights into how NF-kappaB contributes to cancer development through cell cycle dysregulation.