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XB-ART-49296
Hypertension 2014 Nov 01;645:1047-53. doi: 10.1161/HYPERTENSIONAHA.114.04036.
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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.

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 .


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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.

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Species referenced: Xenopus laevis
Genes referenced: slc12a3 stk24 stk39 wnk1 wnk3 wnk4

References [+] :
Cai, WNK4 kinase regulates surface expression of the human sodium chloride cotransporter in mammalian cells. 2006, Pubmed, Xenbase