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• W2072778751 abstract "Pancreatic bicarbonate (HCO3-) secretion is important for a healthy pancreas as well as digestive physiology. However, how human pancreatic duct cells secrete copious amounts of HCO3- has long been a puzzle. Here, we report that a dynamic increase in the cystic fibrosis transmembrane conductance regulator (CFTR) HCO3- permeability by intracellular Cl- concentration ([Cl-]i)-sensitive mechanisms plays a pivotal role in pancreatic HCO3- secretion.The role of [Cl-]i-sensitive kinases in CFTR-mediated HCO3- transport was examined in heterologous expression systems, PANC1 human pancreatic duct cells, and human and guinea pig pancreatic tissues using an integrated molecular and physiologic approach.In human pancreatic tissues, CFTR-positive duct cells abundantly expressed with-no-lysine (WNK1) kinase, oxidative stress-responsive kinase 1 (OSR1), and sterile 20/SPS1-related proline/alanine-rich kinase (SPAK), which are known to be activated by low [Cl-]i. Interestingly, CFTR activation rapidly decreased [Cl-]i in response to luminal Cl- depletion in polarized PANC1 human pancreatic duct cells. Notably, the WNK1-mediated OSR1 and SPAK activation by low [Cl-]i strongly increased CFTR HCO3- permeability in CFTR-transfected HEK 293T, PANC1, and guinea pig pancreatic duct cells, making CFTR primarily an HCO3- channel, which is essential for the secretion of pancreatic juice containing HCO3- at a concentration greater than 140 mmol/L. In contrast, OSR1 and SPAK activation inhibited CFTR-dependent Cl-/HCO3- exchange activity that may reabsorb HCO3- from the high HCO3--containing pancreatic juice.These results indicate that the [Cl-]i-sensitive activation of the WNK1-OSR1/SPAK pathway is the molecular switch to generate HCO3--rich fluid in the human pancreatic duct." @default.
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• W2072778751 date "2010-08-01" @default.
• W2072778751 modified "2023-10-18" @default.
• W2072778751 title "Dynamic Regulation of CFTR Bicarbonate Permeability by [Cl−]i and Its Role in Pancreatic Bicarbonate Secretion" @default.
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• W2072778751 doi "https://doi.org/10.1053/j.gastro.2010.04.004" @default.
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