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Coordinated Control of ENaC and Na+,K+-ATPase in Renal Collecting Duct

Published in Journal of the American Society of Nephrology. 2016, vol. 27, no. 9, p. 2554-63
Abstract Tubular reabsorption of filtered sodium is tightly controlled to maintain body volume homeostasis. The rate of sodium transport by collecting duct (CD) cells varies widely in response to dietary sodium intake, GFR, circulating hormones, neural signals, and local regulatory factors. Reabsorption of filtered sodium by CD cells occurs via a two-step process. First, luminal sodium crosses the apical plasma membrane along its electrochemical gradient through epithelial sodium channels (ENaC). Intracellular sodium is then actively extruded into the interstitial space by the Na(+),K(+)-ATPase located along the basolateral membrane. Mismatch between sodium entry and exit induces variations in sodium intracellular concentration and cell volume that must be maintained within narrow ranges for control of vital cell functions. Therefore, renal epithelial cells display highly coordinated apical and basolateral sodium transport rates. We review evidence from experiments conducted in vivo and in cultured cells that indicates aldosterone and vasopressin, the two major hormones regulating sodium reabsorption by CD, generate a coordinated stimulation of apical ENaC and basolateral Na(+),K(+)-ATPase. Moreover, we discuss evidence suggesting that variations in sodium entry per se induce a coordinated change in Na(+),K(+)-ATPase activity through the signaling of protein kinases such as protein kinase A and p38 mitogen-activated protein kinase.
Keywords AnimalsEpithelial Sodium Channels/physiologyHumansIon TransportKidney TubulesCollecting/enzymologyRenal ReabsorptionSodium-Potassium-Exchanging ATPase/physiology
PMID: 27188842
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Article (Published version) (1.2 MB) - document accessible for UNIGE members only Limited access to UNIGE
Research group Laboratoire de physiologie et pathophysiologie des cellules rénales (29)
Swiss National Science Foundation: 310030_143929
(ISO format)
FERAILLE, Eric, BERNABEU DIZIN, Eva. Coordinated Control of ENaC and Na+,K+-ATPase in Renal Collecting Duct. In: Journal of the American Society of Nephrology, 2016, vol. 27, n° 9, p. 2554-63. doi: 10.1681/ASN.2016020124 https://archive-ouverte.unige.ch/unige:99452

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Deposited on : 2017-11-22

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