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The membrane transporters regulating epithelial NaCl secretion

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Abstract

Ten years ago, the basic principles operating in one specific, albeit non-mammalian, exocrine gland, the rectal gland of Squalus acanthias, were described in detail. The concept emerging from these studies appeared applicable to almost any other exocrine gland, because it involved membrane transporters which are also present in mammalian epithelial cells. Meanwhile, it has become clear that the mechanisms of NaCl secretion are diverse: the mechanisms of NaCl uptake; the ion channels involved; and also the mechanisms of hormonal control. Nevertheless, several steps in NaCl secretion still appear to be uniform: (1) several signalling pathways converge and act cooperatively, (2) one primary regulatory step is the upregulation of the luminal Cl− conductance, (3) secondarily active NaCl uptake mechanisms are upregulated, (4) increasing evidence links NaCl secretion to membrane trafficking and (5) the entire machinery seems to be primed to secure cellular homeostasis in terms of cytosolic ion concentrations. This brief review summarizes the mechanisms of control of NaCl secretion. The major issues addressed are the NaCl uptake mechanisms, the ion channels involved and the cellular mechanisms coordinating secretion. The major NaCl secreting cells discussed here will be the respiratory epithelial cells, the exocrine cells of pancreatic acini and the cells of colonic crypts.

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Greger, R. The membrane transporters regulating epithelial NaCl secretion. Pflügers Arch. 432, 579–588 (1996). https://doi.org/10.1007/s004240050173

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