Abstract
Principal emphasis has been laid on the actions of aldosterone on the kidney, but because of the complexity of the kidney and of its function, a precise delineation of the actions of aldosterone has been difficult to obtain. It has even been difficult to define the exact role that aldosterone plays in the sodium balance as controlled by the kidneys. Furthermore, when aldosterone is given to normal animals for a prolonged period, the renal sodium-retaining effect is only transitory and after a few days ‘escape’ occurs1,2. If however we turn to examining intestinal ionic transport, considerably more useful information about the mode of action of aldosterone can be obtained. Effects are demonstrable on both small intestinal and colonic mucosal epithelium3–9. In contrast to the kidney, there is little doubt that intestinal sodium conservation during periods of sodium depletion is largely if not entirely affected through the adrenal-aldosterone system7,10. Also when aldosterone is given for a prolonged period, there is no stimulation of ‘escape’ intestinal sodium absorption for as long as the administration is continued11,12. Despite the emphasis that has been laid upon the renal effects, therefore, it is quite conceivable that the primary role of aldosterone in sodium homeostasis may lie in the control of sodium transport across gut epithelia. In the present account, attention is only going to be devoted to colon, with a description of the results of some of our investigations in rat and in man by examining the way in which aldosterone modifies the ionic transport processes of the epithelium.
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Edmonds, C.J. (1976). Effects of Aldosterone on the Colon. In: Robinson, J.W.L. (eds) Intestinal Ion Transport. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-6156-5_14
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DOI: https://doi.org/10.1007/978-94-011-6156-5_14
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