Gastric mucosal proteins and ulcer-base exudate

Gastric mucosal proteins and ulcer-base exudate refer to the collection of proteins, such as albumin, fibrinogen, and globulins, that are exposed or secreted at the site of a gastric or duodenal ulcer (DrugBank DB00364). These proteins serve as the primary site of action for the cytoprotective drug sucralfate (StatPearls, "Sucralfate"). In the acidic environment of the stomach (pH < 4), sucralfate undergoes polymerization to form a viscous, negatively charged paste that binds to these positively charged proteins (PubChem CID 6398). This interaction creates a physical barrier that protects the underlying damaged tissue from further erosion by gastric acid, pepsin, and bile salts (NIH, "Sucralfate"). By shielding the ulcer base, this protein-drug complex facilitates the natural healing process and prevents further mucosal injury (PubMed PMID 3888130). While not a traditional receptor or enzyme, this protein-exudate complex is critical for the localized therapeutic effect of barrier-forming medications. The binding is highly selective for damaged tissue, as the proteins are only accessible where the mucosal lining has been breached.

Other names

Ulcer-base proteinsGastric exudate proteinsMucosal protein complexAlbumin-fibrinogen-globulin complex (ulcer-associated)

Formation of a protective physical barrier through the binding of polyanionic sucralfate to positively charged proteins in the ulcer base.