Digestive secretory pathways

Digestive secretory pathways represent the coordinated physiological processes through which the gastrointestinal (GI) tract and its accessory organs—including the salivary glands, stomach, pancreas, and liver—produce and release essential substances for digestion (NIH, 2023). These secretions include hydrochloric acid, bicarbonate, bile, and a variety of digestive enzymes such as amylase, pepsin, and lipase, which are critical for the chemical breakdown of food into absorbable nutrients (Lumen Learning, 2024). The regulation of these pathways involves a complex interplay of neural signals from the enteric nervous system and hormonal triggers like gastrin, secretin, and cholecystokinin (StatPearls, 2023). Clinically, dysregulation of these secretory pathways is a hallmark of several major GI disorders. For instance, hypersecretion of gastric acid leads to gastroesophageal reflux disease (GERD) and peptic ulcer disease, while impaired pancreatic secretion results in exocrine pancreatic insufficiency (MedlinePlus, 2025). Pharmacological management often involves targeting specific molecular components within these pathways, such as using proton pump inhibitors like omeprazole to inhibit the H+/K+-ATPase or administering exogenous enzymes like pancrelipase for replacement therapy (PubMed, 2015). Additionally, antisecretory drugs like crofelemer are used to manage secretory diarrhea by inhibiting ion channels like the cystic fibrosis transmembrane conductance regulator (CFTR) that drive fluid loss (NIH, 2016).

Other names

Gastrointestinal secretionDigestive secretionAlimentary tract secretionExocrine secretion of the digestive system

Pharmacological agents modulate these pathways by inhibiting specific ion pumps (e.g., H+/K+-ATPase), blocking hormonal receptors (e.g., H2 or CCK receptors), providing exogenous enzyme replacement, or regulating ion channel activity (e.g., CFTR) to control fluid and electrolyte secretion.