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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Role of adrenal hormones in regulating distal nephron structure and ion transport.

Mineralocorticoid levels are an important determinant of membrane area and ion transport in the renal initial (ICT) and cortical ( CCT) collecting tubules. Adrenalectomy leads to a dramatic and specific decrease in basolateral membrane area of principal (P) cells and depresses sodium reabsorption and potassium secretion. Although aldosterone replacement for 10 days restores basolateral membrane area and ATPase activity to control levels and dramatically elevates ion transport, glucocorticoids have no effect on basolateral membrane area, ion transport, or ATPase. It is suggested that the aldosterone-induced amplification of membrane area occurs as a mechanism whereby cells increase the number of ATPase pumps in the basolateral membrane. An acute (of 2-3 h) increase in aldosterone, but not dexamethasone, also stimulates potassium transport by the ICT. Future studies will have to establish whether the acute stimulation of transport by aldosterone involves a change in basolateral membrane area. It is concluded that mineralocorticoids, but not glucocorticoids, regulate sodium and potassium transport by P cells of the ICT and CCT, in part, by determining the number of ATPase pumps available for transport.[1]


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