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Nat Immunol. 2014 Mar;15(3):223-30. doi: 10.1038/ni.2824. Epub 2014 Feb 9.

Leukocyte extravasation and vascular permeability are each controlled in vivo by different tyrosine residues of VE-cadherin.

Author information

1
Max-Planck-Institute for Molecular Biomedicine, Münster, Germany.
2
Department of Anesthesiology and Critical Care Medicine, University of Münster, Germany.
3
1] Max-Planck-Institute for Molecular Biomedicine, Münster, Germany. [2] Department of Anesthesiology and Critical Care Medicine, University of Münster, Germany.

Abstract

Tyrosine phosphorylation of the adhesion molecule VE-cadherin is assumed to affect endothelial junction integrity. However, it remains unclear whether tyrosine residues of VE-cadherin are required for the induction of vascular permeability and the regulation of leukocyte extravasation in vivo. We found here that knock-in mice expressing a Y685F mutant of VE-cadherin had impaired induction of vascular permeability, but those expressing a Y731F mutant did not. In contrast, mice expressing the Y731F VE-cadherin mutant showed decreased neutrophil-extravasation in cremaster tissue, but those expressing the Y685F mutant did not. Whereas inflammatory mediators induced the phosphorylation of Tyr685 in vivo, Tyr731 showed high baseline phosphorylation. Leukocytes triggered dephosphorylation of Tyr731 via the tyrosine phosphatase SHP-2, which allowed the adaptin AP-2 to bind and initiate endocytosis of VE-cadherin. Thus, Tyr685 and Tyr731 of VE-cadherin distinctly and selectively regulate the induction of vascular permeability or leukocyte extravasation.

PMID:
24487320
DOI:
10.1038/ni.2824
[Indexed for MEDLINE]

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