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Chemokine receptor trafficking coordinates neutrophil clustering and dispersal at wounds in zebrafish

last modified Nov 18, 2019 05:03 PM
New study by the Sarris lab published in Nature Communications

 

Abstract: Immune cells congregate at specific loci to fight infections during inflammatory responses, a process that must be transient and self-resolving. Cell dispersal promotes resolution, but it remains unclear how transition from clustering to dispersal is regulated. Here we show, using quantitative live imaging in zebrafish, that differential ligand-induced trafficking of chemokine receptors such as Cxcr1 and Cxcr2 orchestrates the state of neutrophil congregation at sites of tissue damage. Through receptor mutagenesis and biosensors, we show that Cxcr1 promotes clustering at wound sites, but is promptly desensitized and internalized, which prevents excess congregation. By contrast, Cxcr2 promotes bidirectional motility and is sustained at the plasma membrane. Persistent plasma membrane residence of Cxcr2 prolongs downstream signaling and is required for sustained exploratory motion conducive to dispersal. Thus, differential trafficking of two chemokine receptors allows coordination of antagonistic cell behaviors, promoting a self-resolving migratory response.

Reference: Caroline Coombs, Antonios Georgantzoglou, Hazel A. Walker, Julian Patt, Nicole Merten, Hugo Poplimont, Elisabeth M. Busch-Nentwich, Sarah Williams, Christina Kotsi, Evi Kostenis & Milka Sarris (2019), Chemokine receptor trafficking coordinates neutrophil clustering and dispersal at wounds in zebrafish, Nature Communications volume 10, Article number: 5166