Gastric mucosal proteins and ulcer base

The gastric mucosal proteins and ulcer base constitute a therapeutic site of action for cytoprotective agents, most notably sucralfate. When the gastric or duodenal lining is damaged, proteins such as albumin, fibrinogen, and globulins are exposed at the base of the resulting ulcer (StatPearls: https://www.ncbi.nlm.nih.gov/books/NBK551527/). In the presence of gastric acid, sucralfate undergoes polymerization to form a complex, polyanionic gel that selectively adheres to these positively charged proteins (PubChem: https://pubchem.ncbi.nlm.nih.gov/compound/Sucralfate). This interaction creates a physical barrier that protects the ulcerated tissue from the corrosive effects of pepsin, bile salts, and hydrochloric acid. Beyond simple physical protection, this site of action is involved in sequestering fibroblast growth factors and stimulating local prostaglandin production, which accelerates the natural healing and re-epithelialization of the mucosa. Consequently, while not a single receptor or enzyme, this protein-rich environment is a critical target for managing acid-peptic diseases.

Other names

Ulcer baseGastric mucosal proteinsExposed ulcerated tissueUlcer crater

Formation of a protective physical barrier by binding to exposed positively charged proteins at the ulcer site, shielding the tissue from acid, pepsin, and bile salts.