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Epithelial transforming growth factor β-activated kinase 1 (TAK1) is activated through two independent mechanisms and

Emily Omori1, Maiko Inagaki, Yuji Mishina

  • 1Department of Environmental and Molecular Toxicology, North Carolina State University, Raleigh, NC 27695-7633, USA.

Proceedings of the National Academy of Sciences of the United States of America
|February 15, 2012
PubMed

Insights

Transforming growth factor β-activated kinase 1 (TAK1) regulates reactive oxygen species (ROS) in epithelial tissues. Its activity depends on TAB1 for basal function and TAB2 for stimulus-dependent activation, preventing ROS accumulation and cell death.

Area of Science:

  • Cellular Biology
  • Molecular Signaling
  • Immunology

Background:

  • Cellular redox system dysregulation leads to reactive oxygen species (ROS) accumulation, linked to various diseases.
  • Transforming growth factor β-activated kinase 1 (TAK1) is crucial for innate immunity and in vivo redox regulation.
  • TAK1 deficiency causes ROS accumulation, epithelial cell death, and inflammation.

Purpose of the Study:

  • To elucidate the activation mechanism of TAK1 kinase in epithelial tissues.
  • To define the distinct roles of TAK1-binding protein 1 (TAB1) and TAB2 in TAK1 regulation.
  • To understand how TAK1 controls redox balance in epithelial cells.

Main Methods:

  • Generation and analysis of epithelial-specific TAB1 and TAB2 double-knockout mouse models.
  • Assessment of TAK1 kinase activity in knockout mice.
  • Evaluation of reactive oxygen species (ROS) levels and epithelial tissue integrity.

Main Results:

  • Epithelial-specific knockout of both TAB1 and TAB2 mimicked TAK1 knockout phenotypes.
  • TAB1 is essential for the basal, phosphorylation-dependent activity of TAK1.
  • Loss of both TAB1 and TAB2 significantly reduced TAK1 activity and increased ROS accumulation in epithelial tissues.

Conclusions:

  • Epithelial TAK1 activation involves two distinct mechanisms: TAB1-dependent basal activity and TAB2-mediated stimulus-dependent activation.
  • This dual regulation by TAB1 and TAB2 is critical for maintaining epithelial redox homeostasis.
  • Dysregulation of these TAK1 activation pathways contributes to ROS-associated pathologies.

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