CXCL12a/CXCR4b acts to retain neutrophils in caudal hematopoietic tissue and to antagonize recruitment to an injury site in the zebrafish larva
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Abstract
Neutrophils are a major component of the innate immune response and the most abundant circulating cell type in humans and zebrafish. The CXCL12/CXCR4 ligand receptor pair plays a key role in neutrophil homeostasis, controlling definitive hematopoiesis and neutrophil release into circulation. Neutrophils overexpressing CXCR4 respond by migrating towards sources of CXCL12, which is abundant in hematopoietic tissues. However, the physiological role of CXCL12/CXCR4 signaling during inflammatory responses remains unknown. Here, we show that zebrafish mutants lacking functional CXCL12a or CXCR4b show disrupted granulopoiesis in the kidney and increased number of circulating neutrophils. Additionally, CXCL12a and CXCR4b mutants display exacerbated recruitment of neutrophils to wounds and not to infections, and migrating neutrophils to wounds show increased directionality. Our results show that CXCL12a/CXCR4b signaling antagonizes wound-induced inflammatory signals by retaining neutrophils in hematopoietic tissues as a part of a balance between both inflammatory and anti-inflammatory cues, whose dynamic levels control neutrophils complex migratory behavior.
Keywords
Neutrophil Inflammation CXCL12 CXCR4 ZebrafishAbbreviations
- CHT
Caudal hematopoietic tissue
- CXCL12
Chemokine (C-X-C motif) ligand 12
- CXCR4
Chemokine (C-X-C motif) receptor 4
- Dpf
Days post-fertilization
- Hpf
Hours post-fertilization
- Hpi
Hours post-injury
- HSC
Hematopoietic stem cell
Notes
Acknowledgements
We thank Pamela Vargas for expert fish care and Florencio Espinoza for technical help. Zebrafish strains were kindly provided by Darren Gilmour and Stephen Renshaw. This work was supported by grants to MA from FONDECYT (1140702) and FONDAP (15090007).
Compliance with ethical standards
All procedures complied with guidelines of the Animal Ethics Committee of the University of Chile.
Competing interests
The authors declare that they have no competing interests.
Supplementary material
(a-d) DiOC6 stains of 3 dpf of cxcl12a t30516/t30516 (b) and cxcr4b t26035/t26035 (d) mutant larvae and their respective siblings (a and c) showing the location of posterior lateral line neuromasts (arrowheads). Both cxcl12a t30516/t30516 (b) and cxcr4b t26035/t26035 (d) mutant larvae lack or show decreased number of neuromasts in the trunk and the tail compared to their siblings (a and c, respectively). Note that neuromasts in the anterior lateral line (arrows) remain unaffected in mutant larvae (b and d). Scale bar, 500 μm. (GIF 241 kb)
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