Intestinal epithelial surface and mucus layer

The intestinal epithelial surface and mucus layer constitute a complex physiological barrier that serves as the primary interface between the host and the external environment of the gut lumen. This system consists of a specialized cellular monolayer—comprising enterocytes, goblet cells, and Paneth cells—covered by a protective, hydrated gel layer primarily composed of the MUC2 mucin glycoprotein (Johansson & Hansson, 2016). Its fundamental biological function is to facilitate the selective absorption of nutrients and water while simultaneously preventing the translocation of commensal bacteria, pathogens, and dietary antigens into the systemic circulation (Turner, 2009). In pathological states such as Ulcerative Colitis and Crohn's Disease, the integrity of this barrier is often compromised, characterized by a thinned mucus layer and increased epithelial permeability, which facilitates chronic immune activation (Okumura & Takeda, 2017). Therapeutic interventions targeting this system, such as aminosalicylates or mucosal protectants like rebamipide, aim to restore barrier function by reducing inflammation or stimulating the secretion of protective factors (McGuckin et al., 2011). Maintaining the stability of this interface is crucial for gut homeostasis and the prevention of systemic inflammatory responses.

Other names

Intestinal mucosal barrierGut barrierMucus-epithelial interfaceIntestinal mucus layer

Enhancement of mucosal integrity, stimulation of mucin secretion, and reduction of epithelial permeability.