WNK1
WNK1 is a serine/threonine kinase that regulates ion balance by activating SPAK/OSR1 signaling, which phosphorylates cation-chloride cotransporters including NKCC1, NKCC2, and NCC[1]. Mechanistically, WNK1 and WNK4 phosphorylate and activate SPAK/OSR1, placing WNK1 within a conserved WNK-SPAK/OSR1 transporter-control pathway[2]. In disease models, WNK1 or WNK4 mutations cause pseudohypoaldosteronism type II/familial hyperkalemic hypertension, linking pathway activation to renal salt handling, hyperkalemia, and hypertension[3]. Compared with WNK4, WNK1-driven familial hyperkalemic hypertension remains SPAK-dependent but shows different distal-nephron effects on NCC abundance and phosphorylation[4]. For experimental applications, WNK463 provides a pan-WNK inhibitor tool that affects cardiovascular, renal, blood-pressure, fluid, and electrolyte phenotypes in rodent hypertension models[5].
References:
- [1]. Moriguchi T, et al. WNK1 regulates phosphorylation of cation-chloride-coupled cotransporters via the STE20-related kinases, SPAK and OSR1. J Biol Chem. 2005 Dec 30;280(52):42685-93. [Content Brief]
- [2]. Vitari AC, et al. The WNK1 and WNK4 protein kinases that are mutated in Gordon's hypertension syndrome phosphorylate and activate SPAK and OSR1 protein kinases. Biochem J. 2005 Oct 1;391(Pt 1):17-24. [Content Brief]
- [3]. Wilson FH, et al. Human hypertension caused by mutations in WNK kinases. Science. 2001 Aug 10;293(5532):1107-12. [Content Brief]
- [4]. Rafael C, et al. Consequences of SPAK inactivation on Hyperkalemic Hypertension caused by WNK1 mutations: evidence for differential roles of WNK1 and WNK4. Sci Rep. 2018 Feb 19;8(1):3249. [Content Brief]
- [5]. Yamada K, et al. Small-molecule WNK inhibition regulates cardiovascular and renal function. Nat Chem Biol. 2016 Nov;12(11):896-898. [Content Brief]
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