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2014 ; 64
(5
): 1047-53
Nephropedia Template TP
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WNK-SPAK-NCC cascade revisited: WNK1 stimulates the activity of the Na-Cl
cotransporter via SPAK, an effect antagonized by WNK4
#MMPMID25113964
Chávez-Canales M
; Zhang C
; Soukaseum C
; Moreno E
; Pacheco-Alvarez D
; Vidal-Petiot E
; Castañeda-Bueno M
; Vázquez N
; Rojas-Vega L
; Meermeier NP
; Rogers S
; Jeunemaitre X
; Yang CL
; Ellison DH
; Gamba G
; Hadchouel J
Hypertension
2014[Nov]; 64
(5
): 1047-53
PMID25113964
show ga
The with-no-lysine (K) kinases, WNK1 and WNK4, are key regulators of blood
pressure. Their mutations lead to familial hyperkalemic hypertension (FHHt),
associated with an activation of the Na-Cl cotransporter (NCC). Although it is
clear that WNK4 mutants activate NCC via Ste20 proline-alanine-rich kinase, the
mechanisms responsible for WNK1-related FHHt and alterations in NCC activity are
not as clear. We tested whether WNK1 modulates NCC through WNK4, as predicted by
some models, by crossing our recently developed WNK1-FHHt mice (WNK1(+/FHHt))
with WNK4(-/-) mice. Surprisingly, the activated NCC, hypertension, and
hyperkalemia of WNK1(+/FHHt) mice remain in the absence of WNK4. We demonstrate
that WNK1 powerfully stimulates NCC in a WNK4-independent and Ste20
proline-alanine-rich kinase-dependent manner. Moreover, WNK4 decreases the WNK1
and WNK3-mediated activation of NCC. Finally, the formation of oligomers of WNK
kinases through their C-terminal coiled-coil domain is essential for their
activity toward NCC. In conclusion, WNK kinases form a network in which WNK4
associates with WNK1 and WNK3 to regulate NCC.