WNK1 activates SGK1 to regulate the epithelial sodium channel

Academic Article


  • 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. © 2005 by The National Academy of Sciences of the USA.
  • Authors

    Digital Object Identifier (doi)

    Author List

  • Xu BE; Stippec S; Chu PY; Lazrak A; Li XJ; Lee BH; English JM; Ortega B; Huang CL; Cobb MH
  • Start Page

  • 10315
  • End Page

  • 10320
  • Volume

  • 102
  • Issue

  • 29