Duodenal mucosal and submucosal cells

Duodenal mucosal and submucosal cells represent the structural and functional layers of the proximal small intestine responsible for the initial stages of nutrient absorption and acid neutralization. The mucosa is composed of a simple columnar epithelium containing enterocytes, goblet cells, and enteroendocrine cells, which secrete vital hormones such as secretin and cholecystokinin (CCK) (StatPearls, 2023). The underlying submucosa contains specialized Brunner's glands that produce bicarbonate-rich mucus to protect the intestinal lining from acidic chyme (PubMed, 2022). While this anatomical designation is not a single molecular target, it is a focal point for treating peptic ulcers and metabolic disorders. For instance, duodenal mucosal resurfacing is an emerging procedural therapy for Type 2 Diabetes that targets the hyperplastic mucosa to improve glycemic control (Journal of Clinical Endocrinology & Metabolism, 2020). Pharmacological agents like sucralfate provide a physical barrier over these cells, while others modulate the signaling pathways of the resident endocrine cells to treat systemic metabolic disease. These cells also play a critical role in the immune response through the presence of mucosal-associated lymphoid tissue (MALT). Dysfunction in these layers is central to the pathogenesis of Celiac disease and chronic duodenitis.

Other names

Duodenal mucosaDuodenal submucosaBrunner's glandsIntestinal epithelium of the duodenumDuodenal wall layers

Drugs interacting with these cells typically function by providing physical cytoprotection, neutralizing luminal acidity through bicarbonate modulation, or stimulating enteroendocrine cells to release metabolic hormones like GLP-1.