Colon epithelial barrier

The colon epithelial barrier consists of a single layer of specialized epithelial cells (mainly colonocytes), tightly connected by junctional complexes (tight junctions, adherens junctions, desmosomes), and covered by mucus secreted by goblet cells[1][2][3][4][5]. This barrier regulates the selective movement of ions, water, and nutrients into the body while preventing the translocation of pathogens, toxins, and antigens from the colon lumen to underlying tissues[1][3][4][6][7]. Epithelial cells also interact with immune cells to modulate inflammatory responses and maintain immune tolerance. Compromised barrier integrity—due to genetic, inflammatory, infectious, or metabolic disturbances—contributes to the pathogenesis of gastrointestinal and systemic diseases[1][3][7]. Currently, targeting colon barrier integrity is a therapeutic concept but not a molecular drug target, and therapeutic intervention focuses on strengthening barrier function indirectly via immune, nutritional, or regenerative approaches[1][6][7].

Other names

Intestinal epithelial barriergut barriercolonic barrier

Drugs acting on the colon epithelial barrier or its components typically operate through mechanisms such as inhibition of inflammatory cytokines to preserve junction integrity, enhancement of mucin and antimicrobial peptide secretion by goblet and Paneth cells, modulation of epithelial cell turnover and repair processes, and manipulation of tight junction assembly or disassembly.