Crucial role of SLP-76 and ADAP for neutrophil recruitment in mouse kidney ischemia-reperfusion injury

J Exp Med. 2012 Feb 13;209(2):407-21. doi: 10.1084/jem.20111493. Epub 2012 Jan 30.

Abstract

Neutrophils trigger inflammation-induced acute kidney injury (AKI), a frequent and potentially lethal occurrence in humans. Molecular mechanisms underlying neutrophil recruitment to sites of inflammation have proved elusive. In this study, we demonstrate that SLP-76 (SH2 domain-containing leukocyte phosphoprotein of 76 kD) and ADAP (adhesion and degranulation promoting adaptor protein) are involved in E-selectin-mediated integrin activation and slow leukocyte rolling, which promotes ischemia-reperfusion-induced AKI in mice. By using genetically engineered mice and transduced Slp76(-/-) primary leukocytes, we demonstrate that ADAP as well as two N-terminal-located tyrosines and the SH2 domain of SLP-76 are required for downstream signaling and slow leukocyte rolling. The Tec family kinase Bruton tyrosine kinase is downstream of SLP-76 and, together with ADAP, regulates PI3Kγ (phosphoinositide 3-kinase-γ)- and PLCγ2 (phospholipase Cγ2)-dependent pathways. Blocking both pathways completely abolishes integrin affinity and avidity regulation. Thus, SLP-76 and ADAP are involved in E-selectin-mediated integrin activation and neutrophil recruitment to inflamed kidneys, which may underlie the development of life-threatening ischemia-reperfusion-induced AKI in humans.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adaptor Proteins, Signal Transducing / genetics
  • Adaptor Proteins, Signal Transducing / immunology
  • Adaptor Proteins, Signal Transducing / metabolism*
  • Agammaglobulinaemia Tyrosine Kinase
  • Animals
  • Cell Line, Tumor
  • Class Ib Phosphatidylinositol 3-Kinase / metabolism
  • E-Selectin / metabolism
  • Genetic Vectors
  • Humans
  • Integrins / metabolism
  • Kidney / blood supply*
  • Kidney / immunology*
  • Leukocyte Rolling / immunology*
  • Mice
  • Mice, Inbred C57BL
  • Mice, Transgenic
  • Neutrophils / immunology*
  • Peritonitis / chemically induced
  • Peritonitis / immunology
  • Phospholipase C gamma / metabolism
  • Phosphoproteins / genetics
  • Phosphoproteins / immunology
  • Phosphoproteins / metabolism*
  • Protein-Tyrosine Kinases / metabolism
  • Reperfusion Injury / immunology*
  • Retroviridae
  • Thioglycolates / toxicity
  • Transduction, Genetic

Substances

  • Adaptor Proteins, Signal Transducing
  • E-Selectin
  • Fyb protein, mouse
  • Integrins
  • Phosphoproteins
  • SLP-76 signal Transducing adaptor proteins
  • Thioglycolates
  • Class Ib Phosphatidylinositol 3-Kinase
  • Pik3cg protein, mouse
  • Protein-Tyrosine Kinases
  • Agammaglobulinaemia Tyrosine Kinase
  • Btk protein, mouse
  • Phospholipase C gamma