Dietary protein substrates in gastric lumen

Dietary protein substrates in the gastric lumen are the initial forms of ingested nitrogenous compounds that undergo proteolysis in the stomach. The process begins with the action of pepsin, an enzyme activated by gastric acid, which cleaves proteins into smaller peptide fragments (StatPearls: Physiology, Digestion, 2023). These substrates are critical for stimulating the cephalic and gastric phases of digestion, including the secretion of gastrin and cholecystokinin (NIH: Digestive System, 2023). In patients with digestive disorders such as exocrine pancreatic insufficiency or cystic fibrosis, these substrates are the targets of pancreatic enzyme replacement therapy (PERT) to prevent malabsorption (Mayo Clinic: Pancreatitis Treatment, 2023). Additionally, specific dietary proteins like gluten are targeted by novel endopeptidases in development for Celiac disease to neutralize toxic epitopes before they reach the small intestine (ClinicalTrials.gov: Latiglutenase, 2024). Monitoring the breakdown of these substrates is essential for assessing gastrointestinal function and the efficacy of supplemental digestive aids. Therapeutic intervention typically involves the oral administration of enzymes that catalyze the hydrolysis of these proteins within the acidic or neutralizing environment of the stomach and proximal duodenum (PubChem: Pancrelipase, 2024).

Other names

Ingested proteinAlimentary proteinGastric proteinDietary polypeptidesFood-derived protein

Enzymatic hydrolysis of peptide bonds to facilitate absorption or neutralize immunogenic epitopes.