Damaged gastric and duodenal mucosal surface proteins

Damaged gastric and duodenal mucosal surface proteins refer to the collection of proteins, such as albumin and fibrinogen, that become exposed to the gastrointestinal lumen when the protective epithelial lining is eroded (StatPearls, 2023). These proteins typically carry a positive charge in the acidic environment of the stomach, making them a unique site for pharmacological intervention (PubChem, 2024). The primary drug interacting with these proteins is sucralfate, a cytoprotective agent that polymerizes into a viscous paste at low pH (DrugBank, 2024). This paste binds selectively to the exposed proteins in ulcer craters, creating a physical barrier or "bandage" over the damaged area. This barrier prevents further chemical injury from gastric acid, pepsin, and bile salts, thereby facilitating the natural healing process of the mucosa (NIH, 2023). While not a single receptor or enzyme, these proteins serve as a critical therapeutic target for treating peptic ulcer disease and erosive gastritis.

Other names

Exposed ulcerated mucosal proteinsUlcer base proteinsPositively charged proteins in gastric lesionsExposed albumin and fibrinogen in the gastrointestinal tractUlcer-adherent complex

Sucralfate undergoes polymerization in acidic environments (pH < 4) to form a viscous, polyanionic gel that binds to positively charged proteins, such as albumin and fibrinogen, exposed on the surface of damaged gastric and duodenal mucosa (StatPearls, 2023). This interaction creates a physical barrier that protects the ulcerated tissue from further degradation by gastric acid, pepsin, and bile salts (PubChem, 2024).