Gastric mucosa and mucus layer

The gastric mucosa and mucus layer represent the primary defensive barrier of the stomach against the harsh luminal environment characterized by low pH and digestive enzymes [1]. This system comprises a surface epithelial cell layer and an overlying mucus-bicarbonate barrier, which prevents autodigestion by neutralizing hydrochloric acid and inhibiting the activity of pepsin [2]. The mucus itself is a hydrated gel composed of high-molecular-weight glycoproteins, primarily MUC5AC and MUC6, which provide structural integrity and lubrication [2]. In clinical practice, this "target" is the focus of cytoprotective therapy for conditions like peptic ulcers and gastritis, where the barrier is compromised by factors such as H. pylori infection or NSAID use [1]. Drugs interacting with this layer typically work by forming a physical protective coating over lesions or by stimulating the endogenous production of mucus and bicarbonate through prostaglandin-mediated pathways [3].

Other names

Gastric mucosal barrierStomach liningGastric mucus-bicarbonate barrierGastric surface epithelium

Formation of a protective physical barrier (poly-anionic paste), stimulation of endogenous prostaglandin synthesis, enhancement of bicarbonate secretion, and inhibition of pepsin-mediated proteolysis [1][3].