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2015 ; 3
(5
): ä Nephropedia Template TP
gab.com Text
Twit Text FOAVip
Twit Text #
English Wikipedia
Enhanced expression of epithelial sodium channels causes salt-induced
hypertension in mice through inhibition of the ?2-isoform of Na+, K+-ATPase
#MMPMID25991719
Leenen FH
; Hou X
; Wang HW
; Ahmad M
Physiol Rep
2015[May]; 3
(5
): ä PMID25991719
show ga
Knockout of the Nedd4-2 gene in mice results in overexpression of epithelial
sodium channels (ENaC) on the plasma membrane in the kidney, choroid plexus and
brain nuclei. These mice exhibit enhanced pressor responses to CSF [Na(+)] as
well as dietary salt-induced hypertension which both can be blocked by central
infusion of the ENaC blocker benzamil. Functional studies suggest that ENaC
activation in the CNS results in release of endogenous ouabain (EO) and
inhibition of the ?2-isoform of Na(+), K(+)-ATPase. To test this concept more
specifically, we studied Nedd4-2(-/-) mice expressing the ouabain-resistant
?2R/R-isoform of Na(+), K(+)-ATPase. Intracerebroventricular (icv) infusion of
Na(+)-rich aCSF (225 mmol/L Na(+) at 0.4 ?L/min) increased MAP by 10-15 mmHg in
wild-type mice and by 25-30 mmHg in Nedd4-2(-/-) mice, but by only ~5 mmHg in
?2R/R and in ?2R/R/Nedd4-2(-/-) mice. Icv infusion of EO-binding Fab fragments
also blocked the BP response in Nedd4-2(-/-) mice. In Nedd4-2(-/-) mice, 8%
high-salt diet increased MAP by 25-30 mmHg, but in ?2R/R/Nedd4-2(-/-) mice, it
increased by only 5-10 mmHg. In contrast, Nedd4-2(-/-) or ?2R/R did not affect
the hypertension caused by sc infusion of Ang II. These findings substantiate the
concept that enhanced ENaC activity causes salt-induced pressor responses mainly
through EO inhibiting the ?2-isoform of Na(+), K(+)-ATPase in the brain.