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C-terminal SRC kinase controls acute inflammation and granulocyte adhesion.

Abstract
To establish whether the widely expressed regulator of Src family kinases Csk contributes to the control of acute inflammation in vivo, we inactivated csk in granulocytes by conditional mutagenesis (Cre/loxP). Mutant mice (Csk-GEcre) developed acute multifocal inflammation in skin and lung. Animals were protected from the disease in a microbiologically controlled environment, but remained hypersensitive to LPS-induced shock. Csk-deficient granulocytes showed enhanced spontaneous and ligand-induced degranulation with hyperinduction of integrins. This hyperresponsiveness was associated with hyperadhesion and impaired migratory responses in vitro. Hyperphosphorylation of key signaling proteins such as Syk and Paxillin in mutant granulocytes further supported breakdown of the activation threshold set by Csk. By enforcing the need for ligand engagement Csk thus prevents premature granulocyte recruitment while supporting the motility of stimulated cells through negative regulation of cell adhesion.
AuthorsRichard M Thomas, Christian Schmedt, Marco Novelli, B Ken Choi, Jane Skok, Alexander Tarakhovsky, Jürgen Roes
JournalImmunity (Immunity) Vol. 20 Issue 2 Pg. 181-91 (Feb 2004) ISSN: 1074-7613 [Print] United States
PMID14975240 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't)
Chemical References
  • Cytoskeletal Proteins
  • Enzyme Precursors
  • Intracellular Signaling Peptides and Proteins
  • Paxillin
  • Phosphoproteins
  • Pxn protein, mouse
  • Protein-Tyrosine Kinases
  • CSK Tyrosine-Protein Kinase
  • Syk Kinase
  • Syk protein, mouse
  • src-Family Kinases
Topics
  • Acute Disease
  • Animals
  • Blotting, Western
  • CSK Tyrosine-Protein Kinase
  • Cell Adhesion (immunology)
  • Cell Movement
  • Cytoskeletal Proteins (metabolism)
  • Enzyme Precursors (metabolism)
  • Granulocytes (immunology)
  • Inflammation (immunology)
  • Intracellular Signaling Peptides and Proteins
  • Mice
  • Mice, Mutant Strains
  • Microscopy, Confocal
  • Paxillin
  • Phosphoproteins (metabolism)
  • Phosphorylation
  • Protein-Tyrosine Kinases (deficiency, immunology, metabolism)
  • Syk Kinase
  • src-Family Kinases

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