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Lyn is a redox sensor that mediates leukocyte wound attraction in vivo.

Tissue wounding induces the rapid recruitment of leukocytes. Wounds and tumours--a type of 'unhealed wound'--generate hydrogen peroxide (H(2)O(2)) through an NADPH oxidase (NOX). This extracellular H(2)O(2) mediates recruitment of leukocytes, particularly the first responders of innate immunity, neutrophils, to injured tissue. However, the sensor that neutrophils use to detect the redox state at wounds is unknown. Here we identify the Src family kinase (SFK) Lyn as a redox sensor that mediates initial neutrophil recruitment to wounds in zebrafish larvae. Lyn activation in neutrophils is dependent on wound-derived H(2)O(2) after tissue injury, and inhibition of Lyn attenuates neutrophil wound recruitment. Inhibition of SFKs also disrupted H(2)O(2)-mediated chemotaxis of primary human neutrophils. In vitro analysis identified a single cysteine residue, C466, as being responsible for direct oxidation-mediated activation of Lyn. Furthermore, transgenic-tissue-specific reconstitution with wild-type Lyn and a cysteine mutant revealed that Lyn C466 is important for the neutrophil wound response and downstream signalling in vivo. This is the first identification, to our knowledge, of a physiological redox sensor that mediates leukocyte wound attraction in multicellular organisms.

Pubmed ID: 22101434


  • Yoo SK
  • Starnes TW
  • Deng Q
  • Huttenlocher A



Publication Data

December 1, 2011

Associated Grants

  • Agency: NHLBI NIH HHS, Id: 5T32 HL07899
  • Agency: NHLBI NIH HHS, Id: F30 HL114143
  • Agency: NIGMS NIH HHS, Id: GM074827
  • Agency: NIGMS NIH HHS, Id: R01 GM074827
  • Agency: NIGMS NIH HHS, Id: R01 GM074827-08

Mesh Terms

  • Animals
  • Cells, Cultured
  • HEK293 Cells
  • Humans
  • Hydrogen Peroxide
  • Larva
  • Neutrophils
  • Oxidation-Reduction
  • Wounds and Injuries
  • Zebrafish
  • Zebrafish Proteins
  • src-Family Kinases