Fluid and electrolyte secretion from secretory epithelia is a highly regulated process. Chloride channel activity at the apical membrane determines the rate and direction of salt and water secretion. Multiple classes of Cl− channels with distinct gating mechanisms are involved in moving ions and water. Secretory agonists that induce intracellular increases in two second messenger systems, cAMP and [Ca2+] i , are generally associated with secretion. However, changes in cell volume and the membrane potential may also play a role in regulating fluid and electrolyte secretion in some tissues. In this review we discuss the regulation of the different types of Cl− channels found in secretory epithelia.
The Journal of Membrane Biology – Springer Journals
Published: May 15, 1998
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