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- W2105477580 abstract "Localization of K-NPPase and Li+ secretion in the exocrine pancreas of the pig. Acta Physiol Scand 130, 457–466. Received 30 October 1986, accepted 9 February 1987, ISSN 0001–6772. University of Oslo, Institute for Experimental Medical Research and Surgical Department, Ullevaal Hospital and Department of Pathology, The Norwegian College of Veterinary Medicine, Oslo, Norway. To study the mode of transepithelial Na+ transport into pancreatic ducts during secretindependent NaHCO3 secretion, Na, K-ATPase was first localized within the exocrine pancreas of the pig using a cytochemical reaction for K-dependent p-nitrophenylphosphatase (K-NPPase). K-NPPase staining was confined to the lateral cell membrane bordering the intercellular spaces between ductal cells, negating the possibility of primary active, transcellular Na+ transport into pancreatic ducts. To assess how transepithelial Na+ transport may be coupled to HCO-3 secretion, net flux of Li+ into pancreatic juice was measured following intravenous systemic Li+ loading of 12 secretin infused, anaesthetized pigs. At plasma Li+ 32 (23–35) mmol I-1, Li+ displaced Na+ as accompanying cation to secreted HCO3--, and Li+/Na+ in pancreatic juice matched Li+/Na+ in arterial plasma. During superimposed inhibition of pancreatic water flux by hyperglycaemia, Li+ and Na+ were both transported against a transepithelial concentration gradient. Li+ reduced pancreatic HCO3- secretion rate by 14 (-2 to-20)%, as well as Na, K-ATPase activity in a separate in vim assay. The finding that Li+ substituted for Na+ in the secretion even during reduced osmotic water flow suggests that Na+ and Li+ are transported together with secreted HCO3- into pancreatic juice by an electrogenic mechanism in addition to solvent drag and diffusion." @default.
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- W2105477580 date "1987-07-01" @default.
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- W2105477580 title "Localization of K-NPPase and Li+secretion in the exocrine pancreas of the pig" @default.
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- W2105477580 doi "https://doi.org/10.1111/j.1748-1716.1987.tb08162.x" @default.
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