Nuclear-localized focal adhesion kinase regulates inflammatory VCAM-1 expression

J Cell Biol. 2012 Jun 25;197(7):907-19. doi: 10.1083/jcb.201109067.

Abstract

Vascular cell adhesion molecule-1 (VCAM-1) plays important roles in development and inflammation. Tumor necrosis factor-α (TNF-α) and focal adhesion kinase (FAK) are key regulators of inflammatory and integrin-matrix signaling, respectively. Integrin costimulatory signals modulate inflammatory gene expression, but the important control points between these pathways remain unresolved. We report that pharmacological FAK inhibition prevented TNF-α-induced VCAM-1 expression within heart vessel-associated endothelial cells in vivo, and genetic or pharmacological FAK inhibition blocked VCAM-1 expression during development. FAK signaling facilitated TNF-α-induced, mitogen-activated protein kinase activation, and, surprisingly, FAK inhibition resulted in the loss of the GATA4 transcription factor required for TNF-α-induced VCAM-1 production. FAK inhibition also triggered FAK nuclear localization. In the nucleus, the FAK-FERM (band 4.1, ezrin, radixin, moesin homology) domain bound directly to GATA4 and enhanced its CHIP (C terminus of Hsp70-interacting protein) E3 ligase-dependent polyubiquitination and degradation. These studies reveal new developmental and anti-inflammatory roles for kinase-inhibited FAK in limiting VCAM-1 production via nuclear localization and promotion of GATA4 turnover.

Publication types

  • Research Support, N.I.H., Extramural
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Active Transport, Cell Nucleus
  • Animals
  • Cell Nucleus / metabolism*
  • Cells, Cultured
  • Embryo, Mammalian / metabolism
  • Enzyme Activation
  • Focal Adhesion Kinase 1 / genetics
  • Focal Adhesion Kinase 1 / metabolism*
  • GATA4 Transcription Factor / metabolism
  • Gene Expression Regulation, Developmental
  • Humans
  • Mice
  • Mice, Transgenic
  • Tumor Necrosis Factor-alpha / metabolism
  • Ubiquitination
  • Vascular Cell Adhesion Molecule-1 / metabolism*

Substances

  • GATA4 Transcription Factor
  • Gata4 protein, mouse
  • Tumor Necrosis Factor-alpha
  • Vascular Cell Adhesion Molecule-1
  • Focal Adhesion Kinase 1
  • Ptk2 protein, mouse