Tnik: A redox sensor in endothelial cell permeability

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1 Citation (Scopus)

Abstract

Dysregulation of endothelial barrier integrity can lead to vascular leak and potentially fatal oedema. TNF-α controls endothelial permeability during inflammation and requires the actin organizing Ezrin-Radixin-Moesin (ERM) proteins. We identified TRAF2 and NCK-interacting kinase (TNIK) as a kinase directly phosphorylating and activating ERM, specifically at the plasma membrane of primary human endothelial cells. TNIK mediates TNF-α-dependent cellular stiffness and paracellular gap formation in vitro and is essential in driving inflammatory oedema formation in vivo. Unlike its homologs, TNIK activity is negatively and reversibly regulated by H 2O 2-mediated oxidation of C202 within the kinase domain. TNIK oxidation results in intermolecular disulfide bond formation and loss of kinase activity. Pharmacologic inhibition of endogenous reactive oxygen species production in endothelial cells elevated TNIK-dependent ERM phosphorylation, endothelial cell contraction, and cell rounding. Together, we highlight an interplay between TNIK, ERM phosphorylation, and redox signalling in regulating TNF-induced endothelial cell permeability.

Original languageEnglish
Pages (from-to)eadk6583
JournalScience Advances
Volume10
Issue number51
DOIs
Publication statusPublished - 20 Dec 2024

Keywords

  • Humans
  • Oxidation-Reduction
  • Endothelial Cells/metabolism
  • Phosphorylation
  • Protein Serine-Threonine Kinases/metabolism
  • Tumor Necrosis Factor-alpha/metabolism
  • Cell Membrane Permeability
  • Animals
  • Cytoskeletal Proteins/metabolism
  • Hydrogen Peroxide/metabolism
  • Reactive Oxygen Species/metabolism
  • Human Umbilical Vein Endothelial Cells/metabolism
  • Signal Transduction
  • Membrane Proteins/metabolism
  • Microfilament Proteins

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