JOURNAL ARTICLE
RESEARCH SUPPORT, NON-U.S. GOV'T
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Regulation of the Na+/K+ ATPase by Klotho.

FEBS Letters 2011 June 24
Klotho-hypomorphic (Klotho(hm)) mice suffer from renal salt wasting and hypovolemia despite hyperaldosteronism. The present study explored the effect of Klotho on renal Na(+)/K(+) ATPase activity. According to immunohistochemistry and confocal microscopy Na(+)/K(+) ATPase protein abundance in isolated collecting ducts was lower in Klotho(hm) mice than in their wild type littermates (Klotho(+/+)). Analysis with dual electrode voltage clamp recording showed that expression of Klotho in Xenopus oocytes increased the Na(+)/K(+) ATPase pump current. Treatment of Xenopus oocytes with Klotho protein similarly increased the pump current. In conclusion, Klotho increases the membrane abundance and activity of the Na(+)/K(+) ATPase. Decreased Na(+)/K(+) ATPase activity could thus contribute to the volume-depletion of klotho(hm) mice.

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