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Gastric Mucosal Barrier (Mucin/Bicarbonate Secretion)
- Molecular classification
- Epithelial barrier, Mucus layer, Bicarbonate secretion
01
Overview
The gastric mucosal barrier is a multifaceted defense system in the stomach that protects against self-digestion by acid and pepsin. It consists of a mucus layer rich in mucin glycoproteins and bicarbonate ions, secreted by specialized epithelial cells. The mucus traps water, excludes large molecules, and resists proteolysis, while bicarbonate neutralizes acid near the epithelial surface, maintaining a near-neutral pH despite an acidic lumen. Damage or dysfunction of this barrier can lead to gastritis or ulceration.
- Other names
- Gastric Mucus LayerMucin-Bicarbonate BarrierGastric Protective Barrier
02
Mechanism of action
NSAIDs inhibit prostaglandin synthesis, reducing bicarbonate and mucin secretion. Cimetidine reduces acid secretion which indirectly can affect bicarbonate secretion. Misoprostol is a synthetic prostaglandin E1 analog that can increase mucin and bicarbonate secretion.
03
Biological functions
Gastric protectionAcid neutralizationEpithelial defenseMaintaining gastric pH gradient
04
Disease associations
GastritisPeptic ulcer diseaseHelicobacter pylori infectionNSAID-induced gastropathy
05
Safety considerations
Compromised barrier integrity leads to increased risk of gastritis and ulceration.NSAIDs and alcohol can disrupt the barrier, increasing acid back-diffusion.
06
Interacting drugs
NSAIDs (e.g., Aspirin)
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