Damaged gastric mucosal proteins

Damaged gastric mucosal proteins refer to the collection of proteins, such as albumin and fibrinogen, that become exposed or exuded at the site of gastric and duodenal ulcers and erosions (StatPearls, 2024). These proteins serve as the primary therapeutic target for cytoprotective agents like sucralfate and bismuth salts (Wikipedia, 2024). In the acidic environment of the stomach (pH < 4), sucralfate undergoes polymerization to form a viscous, negatively charged paste that electrostatically adheres to the positively charged proteins in the ulcer base (NIH, 2024). This interaction creates a physical barrier, often called a chemical bandage, which shields the underlying damaged tissue from further insult by gastric acid, pepsin, and bile salts (Massive Bio, 2025). Beyond simple physical protection, this binding may also help concentrate endogenous growth factors, such as fibroblast growth factor, at the site of injury to promote mucosal healing and angiogenesis (NIH, 2024). Consequently, targeting these proteins is a key strategy in the management of peptic ulcer disease and gastritis. While these drugs act locally and are minimally absorbed, safety considerations include potential aluminum accumulation in patients with renal failure and interference with the absorption of other medications (StatPearls, 2024).

Other names

Exposed mucosal proteinsUlcer-adherent proteinsProteinaceous exudatePositively charged proteins in ulcer base

Formation of a protective physical barrier (chemical bandage) by binding to exposed proteins at the site of mucosal injury.