ZFIN ID: ZDB-PUB-121212-8
Inflammatory Chemokines Direct and Restrict Leukocyte Migration within Live Tissues as Glycan-Bound Gradients
Sarris, M., Masson, J.B., Maurin, D., Van der Aa, L.M., Boudinot, P., Lortat-Jacob, H., and Herbomel, P.
Date: 2012
Source: Current biology : CB   22(24): 2375-2382 (Journal)
Registered Authors: Herbomel, Philippe, Sarris, Milka
Keywords: none
MeSH Terms:
  • Cell Movement*
  • Chemokines/physiology*
  • Humans
  • Inflammation Mediators/physiology*
  • Leukocytes/cytology*
  • Neutrophils/metabolism*
  • Polysaccharides/metabolism*
PubMed: 23219724 Full text @ Curr. Biol.

Chemokines are essential in many cell migration processes, including the recruitment of leukocytes to sites of infection. In the latter context, chemokines promote leukocyte extravasation into the relevant tissue through a well-studied cascade of events. It is widely believed that chemokines further guide leukocytes within tissues via chemotaxis, the directed migration along gradients of soluble ligands. However, the basic mechanism of chemokine action within tissues has yet to be formally addressed in vivo. We identified a chemokine (zCxcl8) that recruits zebrafish neutrophils to infection loci and analyzed its function directly within interstitial tissues of living larvae. Using noninvasive imaging and a controlled cellular source of zCxcl8, we found that zCxcl8 guides neutrophils in a 2-fold manner: by biasing cell speed according to direction (orthotaxis) and by restricting cell motility near the source. We further show that zCxcl8 establishes tissue-bound gradients in vivo by binding to heparan sulfate proteoglycans (HSPGs). Inhibition of this interaction compromised both directional guidance and restriction of neutrophil motility. Thus, by interacting with extracellular HSPGs, chemokines establish robust surface-bound (haptotactic) gradients that mediate both recruitment and retention of leukocytes at sites of infection.