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Intestinal epithelial integrity refers to the ability of the intestinal epithelial cell monolayer and associated molecular junctions (tight junctions, adherens junctions, desmosomes) to form a selective, continuous barrier that separates the intestinal lumen contents (nutrients, microbiota, toxins) from the underlying tissues and immune system. Intact integrity is essential for maintaining immune and metabolic homeostasis, proper absorption of nutrients and water, and defense against pathogens and toxins. The physical barrier is primarily maintained by specialized epithelial cell types (enterocytes, goblet cells, Paneth cells, etc.), extracellular mucus, and an array of junctional proteins, all of which are tightly regulated through genetic, signaling, and metabolic pathways. Loss or dysfunction of this integrity is associated with a wide range of diseases, but the term itself should be used to refer to a physiological status or outcome, not as a molecular drug target[1][2][5][6][8].

Other names

intestinal barrier integrityintestinal epithelial barrier functiongut barrier integrityintestinal mucosal integrity

Drugs or biologics may aim to: - Enhance tight junction formation (e.g., some probiotics or growth factors) - Prevent cytokine-induced barrier disruption (e.g., anti-TNF therapies in IBD)[7] - Modulate immune response to restore barrier function - Stimulate mucin production or modulate epithelial renewal These mechanisms act on the proteins or pathways underlying the integrity, not on "intestinal epithelial integrity" as a target itself.