Journal
JOURNAL OF IMMUNOLOGY
Volume 201, Issue 8, Pages 2492-2501Publisher
AMER ASSOC IMMUNOLOGISTS
DOI: 10.4049/jimmunol.1800003
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Funding
- National Institutes of Health [DK098370, DK105585, DK112436]
- John Sealy Memorial Endowment Fund
- J.W. McLaughlin Predoctoral Fellowship, University of Texas Medical Branch
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Neutrophils are the first responders to sites of inflammation when the intestinal epithelial barrier is breached and the gut microbiota invade. Despite current efforts in understanding the role of neutrophils in intestinal homeostasis, the complex interactions between neutrophils and intestinal epithelial cells (IECs) is still not well characterized. In this study, we demonstrated that neutrophils enhanced production of amphiregulin (AREG), a member of the EGFR ligand family, by IECs, which promoted IEC barrier function and tissue repair. Depletion of neutrophils resulted in more severe colitis in mice because of decreased AREG production by IECs upon dextran sodium sulfate (DSS) insult. Administration of AREG restored epithelial barrier function and ameliorated colitis. Furthermore, neutrophil-derived TGF-beta promoted AREG production by IECs. Mechanistically, TGF-beta activated MEK1/2 signaling, and inhibition of MEK1/2 abrogated TGF-beta-induced AREG production by IECs. Collectively, these findings reveal that neutrophils play an important role in the maintenance of IEC barrier function and homeostasis.
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