Gastrointestinal mucus and ulcer-site proteins

Gastrointestinal mucus and ulcer-site proteins represent a functional pharmacological target for cytoprotective agents used to treat acid-peptic disorders. The gastrointestinal mucus layer is a complex gel primarily composed of high-molecular-weight glycoproteins known as mucins (e.g., MUC5AC, MUC2), which provide a physical and chemical barrier against gastric acid, pepsin, and bile salts (PubMed: 22432332). In the event of mucosal injury or ulceration, the underlying tissue is exposed, revealing proteins such as albumin and fibrinogen at the ulcer site. Therapeutic agents like sucralfate undergo polymerization in the acidic environment of the stomach to form a viscous, negatively charged paste that selectively binds to these positively charged proteins (StatPearls: NBK551527). This interaction creates a physical bandage that shields the damaged tissue from further irritation, thereby facilitating the natural healing process. Additionally, these proteins and the mucus layer can be modulated by drugs like bismuth subsalicylate and rebamipide to enhance mucosal integrity and stimulate prostaglandin production (DrugBank: DB00364).

Other names

Gastric mucusUlcer-adherent proteinsMucosal barrier proteinsMucins

Formation of a protective physical barrier by binding to exposed proteins at the ulcer site and enhancing the endogenous mucus layer.