Intestinal water and electrolyte transport

Intestinal water and electrolyte transport is a fundamental physiological process involving the movement of ions and water across the intestinal epithelium to maintain systemic fluid homeostasis and facilitate digestion. This process is mediated by a coordinated network of transporters, exchangers, and ion channels, such as the Sodium-hydrogen exchanger 3 (NHE3) for absorption and the Cystic fibrosis transmembrane conductance regulator (CFTR) for secretion [1][2]. In a healthy state, the intestine absorbs the vast majority of the several liters of fluid it receives daily from diet and endogenous secretions. Pathological disruption of this balance, often caused by infections, inflammation, or genetic mutations, results in disorders like secretory diarrhea or chronic constipation [1]. Pharmacological strategies often involve targeting specific components of this transport system. For instance, Guanylate cyclase-C agonists like Linaclotide increase cyclic GMP levels to stimulate CFTR-mediated fluid secretion, while NHE3 inhibitors like Tenapanor block sodium absorption to increase luminal fluid volume [3][4]. These interventions are critical for treating conditions such as Irritable Bowel Syndrome with Constipation (IBS-C) and chronic idiopathic constipation [3].

Other names

Intestinal fluid transportIntestinal ion transportEnterocyte electrolyte transportGastrointestinal water and electrolyte transport

Drugs modulate intestinal water and electrolyte transport by either activating secretory pathways (e.g., GC-C agonists increasing cGMP to activate CFTR) or inhibiting absorptive pathways (e.g., NHE3 inhibitors reducing sodium uptake), thereby altering the luminal osmotic pressure and fluid volume.