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Impact of Neutrophils on the Tissue Microenvironment During Intestinal Inflammation
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Journal Article
Impact of Neutrophils on the Tissue Microenvironment During Intestinal Inflammation
2026
Overview
Neutrophils (polymorphonuclear leukocytes, PMN) are abundant innate immune cells that rapidly accumulate at mucosal surfaces during inflammation. While their antimicrobial functions are essential for host defense, sustained PMN activation profoundly alters the tissue microenvironment, driving epithelial barrier disruption, ECM remodeling, metabolic imbalance, and microbiome dysbiosis. In chronic inflammatory diseases such as inflammatory bowel disease (IBD), these processes contribute to persistent tissue injury and therapeutic resistance. In this review, we synthesize evidence from human mucosal biopsies, experimental models of intestinal inflammation, and emerging single-cell, spatial, and metabolic approaches to define how PMN shape the inflamed mucosal microenvironment. We highlight mechanisms governing PMN recruitment, retention, and survival; effector programs including reactive oxygen species production, protease release, and PMN extracellular trap formation; and bidirectional crosstalk with epithelial, stromal, and immune cell compartments. We further discuss how PMN-driven metabolic and microbiome alterations reinforce chronic inflammation and influence responses to biologic therapy. Collectively, these insights reframe PMN as context-dependent regulators of mucosal pathology and repair and identify PMN-centered pathways as promising targets for precision therapies aimed at restoring barrier function and promoting durable inflammatory resolution.
Publisher
Dove Medical Press Limited,Dove Press,Dove Medical Press
Subject
