Secretory processes in GI tract

Secretory processes in the GI tract refer to a complex set of coordinated mechanisms by which epithelial cells, enteroendocrine cells, immune cells, and neurons regulate the transport of ions (mainly chloride, bicarbonate, sodium, and potassium), water, enzymes, mucus, and hormones into the gut lumen. These processes are tightly regulated by numerous signaling molecules and receptors—including G protein-coupled receptors, chloride channels (notably the cystic fibrosis transmembrane conductance regulator, CFTR), and receptor tyrosine kinases—as well as by neuro-immune modulation and various GI hormones (such as gastrin, secretin, CCK, and more)[1][2][4]. Disruption or excessive activation of these pathways underlies major GI diseases such as secretory diarrhea and constipation and forms the basis for the therapeutic action of several modern drugs. This is not a singular molecular target and cannot be mapped to a unique receptor, ion channel, or transporter; it represents a physiological concept encompassing multiple proteins and signaling pathways[1][2][4][5].

Other names

Intestinal secretionGastrointestinal secretionGI tract secretory mechanismsIntestinal secretory pathways

- Modulation of chloride channel conductance (notably CFTR) - G protein-coupled receptor signaling (cAMP and Ca2+ mediated) - Inhibition or stimulation of neurotransmitter receptors (VIP, acetylcholine, histamine, prostaglandins)[1][2][3] - Activation or inhibition of hormone receptors (gastrin, somatostatin, secretin, CCK, GLP-1)[3][4]