Host intestinal epithelial innate immune and barrier pathways

The host intestinal epithelial innate immune and barrier pathways represent a complex system of physical, chemical, and cellular components that maintain gut homeostasis and protect against pathogens. The physical barrier is primarily composed of a single layer of epithelial cells connected by tight junction proteins like claudins and occludins, which regulate paracellular permeability (Nature Reviews Gastroenterology & Hepatology, 2021). The innate immune component involves pattern recognition receptors (PRRs) such as Toll-like receptors (TLRs) and NOD-like receptors (NLRs) that sense microbial signals and trigger protective responses, including the secretion of antimicrobial peptides and mucins (Frontiers in Immunology, 2020). Dysregulation of these pathways is a hallmark of inflammatory bowel diseases (IBD), where increased permeability and aberrant immune activation lead to chronic inflammation (Science, 2017). Therapeutic strategies often target specific molecules within these pathways, such as TNF-alpha or JAK kinases, to restore barrier integrity and dampen excessive immune responses (The Lancet, 2019). Emerging therapies also focus on directly enhancing barrier function through the modulation of tight junction proteins or the administration of growth factors like GLP-2 (Gastroenterology, 2022).

Other names

Intestinal epithelial barrierGut mucosal immunityIntestinal innate immune systemMucosal barrier pathways

Modulation of cytokine signaling, inhibition of leukocyte trafficking, and reinforcement of epithelial tight junction integrity.