Intestinal epithelial cell extracellular matrix and mucus components (IEC-ECM/Mucus)

The intestinal epithelial cell extracellular matrix (ECM) and mucus components constitute a complex, multi-layered structural system essential for maintaining gastrointestinal homeostasis and barrier integrity. The mucus layer, primarily composed of the gel-forming glycoprotein Mucin-2 (MUC2), serves as a physical and chemical shield that protects the underlying epithelium from mechanical stress, digestive enzymes, and commensal or pathogenic microorganisms (Johansson & Hansson, 2016, Nature Reviews Gastroenterology & Hepatology). Beneath the mucus, the ECM provides a scaffold of collagens, laminins, and fibronectin that anchors epithelial cells and regulates critical cellular processes such as proliferation, migration, and differentiation through integrin-mediated signaling (Bonnans et al., 2014, Journal of Cell Science). In pathological states like Inflammatory Bowel Disease (IBD) or colorectal cancer, the composition and organization of these components are often disrupted, leading to increased intestinal permeability and aberrant cell signaling (Turner, 2009, Gastroenterology). While not a single therapeutic target, this system is modulated by mucosal protectants like rebamipide and sucralfate, which aim to reinforce the barrier or protect exposed ECM in ulcerated tissues. Understanding the collective function of these components is vital for developing strategies to treat chronic inflammatory conditions and improve the delivery of oral therapeutics.

Other names

Intestinal mucosal barrierGut extracellular matrixIntestinal glycocalyxMucus layerPericellular matrix of the intestine

Stimulation of mucin synthesis, stabilization of the glycoprotein matrix, and physical coating of exposed extracellular matrix proteins to prevent enzymatic degradation and pathogen adherence.