Local microvascular leakage promotes trafficking of activated neutrophils to remote organs
Author(s)
Type
Journal Article
Abstract
Increased microvascular permeability to plasma proteins and neutrophil emigration are hallmarks of innate immunity and key features of numerous inflammatory disorders. Although neutrophils can promote microvascular leakage, the impact of vascular permeability on neutrophil trafficking is unknown. Here, through the application of confocal intravital microscopy, we report that vascular permeability-enhancing stimuli caused a significant frequency of neutrophil reverse transendothelial cell migration (rTEM). Furthermore, mice with a selective defect in microvascular permeability enhancement (VEC-Y685F-ki) showed reduced incidence of neutrophil rTEM. Mechanistically, elevated vascular leakage promoted movement of interstitial chemokines into the bloodstream, a response that supported abluminal-to-luminal neutrophil TEM. Through development of an in vivo cell labeling method we provide direct evidence for the systemic dissemination of rTEM neutrophils, and showed them to exhibit an activated phenotype and be capable of trafficking to the lungs where their presence was aligned with regions of vascular injury. Collectively, we demonstrate that increased microvascular leakage reverses the localization of directional cues across venular walls, thus causing neutrophils engaged in diapedesis to reenter the systemic circulation. This cascade of events offers a mechanism to explain how local tissue inflammation and vascular permeability can induce downstream pathological effects in remote organs, most notably in the lungs.
Date Issued
2020-05-01
Date Acceptance
2020-01-14
Citation
Journal of Clinical Investigation, 2020, 130 (5), pp.2301-2318
ISSN
0021-9738
Publisher
American Society for Clinical Investigation
Start Page
2301
End Page
2318
Journal / Book Title
Journal of Clinical Investigation
Volume
130
Issue
5
Copyright Statement
© 2020 Owen-Woods et al. This work is licensed under the Creative Commons Attribution 4.0 International License. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.
License URL
Identifier
https://www.ncbi.nlm.nih.gov/pubmed/31971917
PII: 133661
Subjects
Chemokines
Inflammation
Neutrophils
Vascular Biology
endothelial cells
Animals
Capillary Permeability
Male
Mice
Mice, Transgenic
Microvessels
Neutrophil Activation
Neutrophils
Transendothelial and Transepithelial Migration
Publication Status
Published
Coverage Spatial
United States
Date Publish Online
2020-01-23