Gastrointestinal mucosal protection

The gastrointestinal mucosal protection comprises physical, chemical, and immune mechanisms that safeguard the lining of the GI tract from acid, digestive enzymes, toxic substances, and pathogens. Key components include the mucus gel layer (primarily formed by mucins like MUC1, MUC5, and MUC6), epithelial cells that secrete bicarbonate to neutralize acid, a robust local blood flow for oxygenation and pH regulation, and various immune factors and cytokines. Disruption of these defense processes—by drugs (e.g., NSAIDs, alcohol), pathogens (e.g., *Helicobacter pylori*), or stress—can lead to erosive and ulcerative disease, bleeding, and infection

Other names

Gastrointestinal mucosal barriergastric mucosal protectiongastroduodenal mucosal defense

For protective agents: Prostaglandin analogs (stimulate mucus and bicarbonate production, decrease acid secretion); Sucralfate forms a protective barrier over mucosal injuries; Bismuth subsalicylate coats ulcers and has antimicrobial effects. For damaging agents: NSAIDs block prostaglandin synthesis, reducing mucus/bicarbonate production; Alcohol damages mucus layer