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WNK1 activates SGK1 to regulate the epithelial sodium channel #MMPMID16006511
Xu BE; Stippec S; Chu PY; Lazrak A; Li XJ; Lee BH; English JM; Ortega B; Huang CL; Cobb MH
Proc Natl Acad Sci U S A 2005[Jul]; 102 (29): 10315-20 PMID16006511show ga
WNK (with no lysine [K]) kinases are serine-threonine protein kinases with an atypical placement of the catalytic lysine. Intronic deletions increase the expression of WNK1 in humans and cause pseudohypoaldosteronism type II, a form of hypertension. WNKs have been linked to ion carriers, but the underlying regulatory mechanisms are unknown. Here, we report a mechanism for the control of ion permeability by WNK1. We show that WNK1 activates the serum- and glucocorticoid-inducible protein kinase SGK1, leading to activation of the epithelial sodium channel. Increased channel activity induced by WNK1 depends on SGK1 and the E3 ubiquitin ligase Nedd4-2. This finding provides compelling evidence that this molecular mechanism contributes to the pathogenesis of hypertension in pseudohypoaldosteronism type II caused by WNK1 and, possibly, in other forms of hypertension.
|Animals[MESH]
|CHO Cells[MESH]
|Cells, Cultured[MESH]
|Cricetinae[MESH]
|Cricetulus[MESH]
|Endosomal Sorting Complexes Required for Transport[MESH]
|Enzyme Activation/physiology[MESH]
|Epithelial Sodium Channels[MESH]
|Humans[MESH]
|Immediate-Early Proteins/*metabolism[MESH]
|Immunoblotting[MESH]
|Immunoprecipitation[MESH]
|Intracellular Signaling Peptides and Proteins[MESH]