Dietary proteins and peptides in the gastrointestinal lumen

Dietary proteins and peptides in the gastrointestinal lumen are the primary sources of nitrogen and essential amino acids required for human growth and maintenance (Guyton and Hall, Textbook of Medical Physiology). These macromolecules are broken down by gastric and pancreatic proteases into smaller peptides and amino acids for absorption via specialized transporters in the enterocytes (NIH, PubChem). While not a traditional therapeutic target like a cell-surface receptor, they serve as the substrate for digestive enzyme replacement therapies (PERT), such as pancrelipase, used to treat exocrine pancreatic insufficiency (StatPearls). In specific pathologies like Celiac disease, certain dietary peptides (e.g., gluten-derived 33-mer) become the focus of substrate reduction or enzymatic detoxification strategies using agents like latiglutenase (Syage et al., 2017, Digestive Diseases and Sciences). Because this category encompasses all ingested proteins, it is generally considered a substrate class rather than a specific molecular target, though specific peptides within the lumen are highly relevant in allergy and metabolic disease research (NORD; PubMed).

Other names

Alimentary proteinsFood-derived peptidesLuminal proteinsDietary polypeptides

Therapeutic intervention typically involves enzymatic proteolysis to facilitate absorption or the degradation of immunogenic/toxic peptide fragments.