Intestinal epithelial barrier proteins

The intestinal epithelial barrier is a critical physiological system composed of a single layer of epithelial cells and their associated junctional complexes, including tight junctions, adherens junctions, and desmosomes (PMID: 23307037). Its primary function is to maintain a selective barrier that allows for the absorption of nutrients and water while preventing the translocation of luminal pathogens, toxins, and antigens into the systemic circulation (PMID: 28123248). Key proteins involved in this structure include claudins, occludin, and zonula occludens-1 (ZO-1), which regulate paracellular permeability. Impairment of these proteins leads to increased intestinal permeability, a condition associated with inflammatory bowel disease, celiac disease, and various metabolic disorders (PMID: 33072622). Therapeutic interventions aim to stabilize these protein-protein interactions or inhibit regulatory pathways, such as the zonulin pathway, to restore barrier integrity and reduce systemic inflammation (PMID: 25567115).

Other names

Intestinal mucosal barrierGut barrierTight junction complexIntestinal permeability barrier

Pharmacological agents target the intestinal barrier by inhibiting zonulin-mediated tight junction disassembly, activating chloride channels to promote mucosal repair, or reducing pro-inflammatory cytokines that degrade junctional proteins (PMID: 25567115, 28123248).