Distinct Tissue Damage and Microbial Cues Drive Neutrophil and Macrophage Recruitment to Thermal Injury

IScience
Francisco Barros-BeckerAnna Huttenlocher

Abstract

Tissue damage triggers a rapid innate immune response that mediates host defense. Previously we reported that thermal damage of the larval zebrafish fin disrupts collagen organization and induces a robust and potentially damaging innate immune response. The mechanisms that drive damaging versus protective neutrophil inflammation in interstitial tissues remain unclear. Here we identify distinct cues in the tissue microenvironment that differentially drive neutrophil and macrophage responses to sterile injury. Using live imaging, we found a motile zone for neutrophils, but not macrophages, in collagen-free regions and identified a specific role for interleukin-6 (IL-6) receptor signaling in neutrophil responses to thermal damage. IL-6 receptor mutants show impaired neutrophil recruitment to sterile thermal injury that was not present in tissues infected with Pseudomonas aeruginosa. These findings identify distinct signaling networks during neutrophil recruitment to sterile and microbial damage cues and provide a framework to limit potentially damaging neutrophil inflammation.

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Citations

May 29, 2021·The Journal of Cell Biology·Ruth A HouserightAnna Huttenlocher
Aug 31, 2021·Cells & Development·Antonios GeorgantzoglouMilka Sarris

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Datasets Mentioned

BETA
MW067024
MW067025

Methods Mentioned

BETA
transgenic
confocal microscopy
fluorescence imaging
biopsies

Software Mentioned

Phobius
ENSEMBL
Imaris

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