Water secretion in the intestine

Water secretion in the intestine is a physiological process that involves the movement of large volumes of water into the intestinal lumen. This process is driven by osmotic gradients established primarily through the active secretion of chloride ions via channels such as the **cystic fibrosis transmembrane conductance regulator (CFTR)**, with sodium following paracellularly and water moving passively in response to these gradients[1][3]. Intestinal water secretion is tightly regulated by neural, hormonal, and paracrine factors, and is critical for proper digestion and protection of the mucosal surface[1][3][5]. Dysregulation leads to disorders such as secretory diarrhea, notably in cholera, where bacterial toxins lead to sustained activation of cyclic AMP pathways and persistent chloride and water secretion[1][3]. Drugs targeting specific ion channels (e.g., CFTR inhibitors) or mediators (e.g., 5-HT receptor antagonists) are developed to ameliorate pathological secretion, but there is no single molecule or canonical receptor called “water secretion in the intestine”—rather, this term encompasses a complex network of channels (such as CFTR, aquaporins, SGLT1), transporters, and regulatory mediators[1][3][6][7][8].

Other names

Intestinal fluid secretionintestinal water secretionintestinal epithelial fluid secretionwater transport in the intestine