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Focal Adhesion Kinase Activity and Localization is Critical for TNF-α-Induced Nuclear Factor-κB Activation.

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Focal adhesion kinase (FAK) regulates sustained nuclear factor-κB (NF-κB) activation in chronic inflammation. Inhibiting FAK blocks tumor necrosis factor-α (TNF-α)-induced NF-κB signaling in endothelial cells, suggesting FAK inhibitors for inflammatory diseases.

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FAKIKKIκBNF-κBRIPK1TNF-α

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Area of Science:

  • Cell Biology
  • Molecular Biology
  • Immunology

Background:

  • Sustained nuclear factor-κB (NF-κB) activation drives proinflammatory molecule expression in chronic inflammation.
  • Regulators of NF-κB activity during chronic inflammation remain largely unknown.

Purpose of the Study:

  • To investigate the role of focal adhesion kinase (FAK) in sustained NF-κB activation.
  • To explore FAK's mechanism in tumor necrosis factor-α (TNF-α)-stimulated endothelial cells (ECs).

Main Methods:

  • In vitro and in vivo studies using TNF-α-stimulated ECs.
  • Investigated FAK inhibition's effect on TNF-α receptor complex-I (TNFRC-I) formation.
  • Assessed recruitment of RIPK1 and IKK complex to TNFRC-I.
  • Utilized pharmacological and genetic FAK inhibition in mouse models.

Main Results:

  • FAK inhibition abolished TNF-α-mediated sustained NF-κB activity in ECs by disrupting TNFRC-I formation.
  • FAK inhibition reduced RIPK1 and IKK complex recruitment, increasing IκBα stability.
  • FAK inhibition blocked TNF-α-induced IKK-NF-κB activation in mouse aortic ECs.
  • TNF-α induced FAK redistribution from nucleus to cytoplasm, enhancing NF-κB activation; FAK inhibition trapped FAK in the nucleus, reducing NF-κB activity.

Conclusions:

  • FAK plays a critical role in sustained NF-κB activation during TNF-α stimulation in ECs.
  • FAK inhibition offers a potential therapeutic strategy for chronic inflammatory diseases.