Intestinal mucus and epithelial cell surface

The intestinal mucus and epithelial cell surface constitute a multi-layered physiological barrier that separates the host's internal environment from the luminal contents. The mucus layer, primarily composed of the MUC2 glycoprotein, acts as a physical and chemical shield that traps pathogens and houses the commensal microbiota (Johansson et al., 2011). The underlying epithelial surface, including the glycocalyx and microvilli, facilitates nutrient absorption while maintaining tight junctions to prevent the translocation of harmful substances (Turner, 2009). Dysfunction of this barrier is a hallmark of several gastrointestinal disorders, including inflammatory bowel disease (IBD) and celiac disease, where increased permeability leads to immune activation (Okumura & Takeda, 2017). Therapeutic strategies targeting this interface often involve mucoadhesive drug delivery systems or agents that reinforce the barrier, such as sucralfate or specific probiotics (Bernkop-Schnürch, 2005). Understanding the dynamics of this surface is crucial for developing treatments that can effectively navigate or repair the gut's primary defense mechanism.

Other names

Intestinal mucosal barrierGut barrierIntestinal glycocalyxMucus-epithelial interface

Drugs targeting this interface typically act via mucoadhesion, physical coating of the epithelium, or by modulating the expression of mucins and tight junction proteins to restore barrier integrity (Bernkop-Schnürch, 2005).