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NF-kappaB activity is constitutively elevated in c-Abl null fibroblasts.

Rachel A Liberatore1, Stephen P Goff, Irene Nunes

  • 1Department of Biochemistry and Molecular Biophysics, College of Physicians and Surgeons, Columbia University, New York, NY 10032, USA.

Proceedings of the National Academy of Sciences of the United States of America
|October 7, 2009
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Endogenous c-Abl acts as a negative regulator of NF-kappaB activity. c-Abl-deficient cells show increased NF-kappaB activity due to reduced HDAC1 levels, impacting cellular signaling pathways.

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Area of Science:

  • Molecular Biology
  • Cellular Signaling
  • Oncogenes

Background:

  • c-Abl is a nonreceptor tyrosine kinase regulating crucial cellular processes.
  • c-Abl influences pathways including growth factor signaling, cytoskeleton remodeling, and stress responses.
  • Elevated c-Abl kinase activity can inhibit NF-kappaB by stabilizing IkappaB alpha.

Purpose of the Study:

  • To investigate the role of endogenous c-Abl in regulating NF-kappaB activity.
  • To determine if c-Abl deficiency leads to altered NF-kappaB activation.
  • To elucidate the mechanisms by which c-Abl affects NF-kappaB regulation.

Main Methods:

  • Primary mouse embryonic fibroblasts (MEFs) from wild-type and c-Abl knockout mice were used.
  • NF-kappaB activity was measured in response to stimulation.
  • Levels of IkappaB alpha, p65/RelA, and HDAC1 were examined.
  • Responsiveness to trichostatin A (HDAC inhibitor) was assessed.

Main Results:

  • c-Abl knockout MEFs exhibited elevated basal and inducible NF-kappaB activity.
  • No significant changes in IkappaB alpha degradation, p65/RelA translocation, or DNA binding were observed in unstimulated knockout MEFs.
  • Knockout MEFs showed reduced levels of the negative regulator HDAC1.
  • c-Abl knockout MEFs were less responsive to HDAC inhibition by trichostatin A.

Conclusions:

  • Endogenous c-Abl negatively regulates both basal and inducible NF-kappaB activity.
  • c-Abl may play a role in HDAC-mediated repression of basal NF-kappaB activity.
  • Reduced HDAC1 levels in c-Abl-deficient cells contribute to elevated NF-kappaB activity.