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Immunity. 2014 Jan 16;40(1):66-77. doi: 10.1016/j.immuni.2013.11.020. Epub 2014 Jan 9.

Transmigrating neutrophils shape the mucosal microenvironment through localized oxygen depletion to influence resolution of inflammation.

Author information

1
Mucosal Inflammation Program, University of Colorado, Anschutz Medical Campus, Aurora, CO 80045, USA. Electronic address: eric.campbell@ucdenver.edu.
2
Department of Biology, Hanover College, Hanover, IN 47243, USA.
3
Mucosal Inflammation Program, University of Colorado, Anschutz Medical Campus, Aurora, CO 80045, USA.
4
University of Colorado, Anschutz Medical Campus, Aurora, CO 80045, USA.
5
University College Dublin, Dublin 4, Ireland.

Abstract

Acute intestinal inflammation involves early accumulation of neutrophils (PMNs) followed by either resolution or progression to chronic inflammation. Based on recent evidence that mucosal metabolism influences disease outcomes, we hypothesized that transmigrating PMNs influence the transcriptional profile of the surrounding mucosa. Microarray studies revealed a cohort of hypoxia-responsive genes regulated by PMN-epithelial crosstalk. Transmigrating PMNs rapidly depleted microenvironmental O2 sufficiently to stabilize intestinal epithelial cell hypoxia-inducible factor (HIF). By utilizing HIF reporter mice in an acute colitis model, we investigated the relative contribution of PMNs and the respiratory burst to "inflammatory hypoxia" in vivo. CGD mice, lacking a respiratory burst, developed accentuated colitis compared to control, with exaggerated PMN infiltration and diminished inflammatory hypoxia. Finally, pharmacological HIF stabilization within the mucosa protected CGD mice from severe colitis. In conclusion, transcriptional imprinting by infiltrating neutrophils modulates the host response to inflammation, via localized O2 depletion, resulting in microenvironmental hypoxia and effective inflammatory resolution.

PMID:
24412613
PMCID:
PMC3951457
DOI:
10.1016/j.immuni.2013.11.020
[Indexed for MEDLINE]
Free PMC Article

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