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- W3005582599 abstract "The inappropriate over-activation of the with-no-lysine kinase (WNK)–STE20/SPS1–related proline/alanine-rich kinase (SPAK)–sodium chloride cotransporter (NCC) phosphorylation cascade increases sodium reabsorption in distal kidney nephrons, resulting in salt-sensitive hypertension. Although chronic kidney disease (CKD) is a common cause of salt-sensitive hypertension, the involvement of the WNK phosphorylation cascade is unknown. Moreover, the effect of immune systems on WNK kinases has not been investigated despite the fact that immune systems are important for salt sensitivity. Here we demonstrate that the protein abundance of WNK1, but not of WNK4, was increased at the distal convoluted tubules in the aristolochic acid nephropathy mouse model of CKD. Accordingly, the phosphorylation of both SPAK and NCC was also increased. Moreover, a high-salt diet did not adequately suppress activation of the WNK1–SPAK–NCC phosphorylation cascade in this model, leading to salt-sensitive hypertension. WNK1 also was increased in adenine nephropathy, but not in subtotal nephrectomy, models of CKD. By comparing the transcripts of these three models focusing on immune systems, we hypothesized that tumor necrosis factor (TNF)-α regulates WNK1 protein expression. In fact, TNF-α increased WNK1 protein expression in cultured renal tubular cells by reducing the transcription and protein levels of NEDD4-2 E3-ligase, which degrades WNK1 protein. Furthermore, the TNF-α inhibitor etanercept reversed the reduction of NEDD4-2 expression and upregulation of the WNK1–SPAK–NCC phosphorylation cascade in distal convoluted tubules <i>in vivo</i> in the aristolochic acid nephropathy model. Thus, salt-sensitive hypertension is induced in CKD via activation of the renal WNK1– SPAK–NCC phosphorylation cascade by TNF-α, reflecting a link with the immune system." @default.
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- W3005582599 date "2020-04-01" @default.
- W3005582599 modified "2023-10-15" @default.
- W3005582599 title "Renal TNFα activates the WNK phosphorylation cascade and contributes to salt-sensitive hypertension in chronic kidney disease" @default.
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- W3005582599 doi "https://doi.org/10.1016/j.kint.2019.11.021" @default.
- W3005582599 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/32059997" @default.
- W3005582599 hasPublicationYear "2020" @default.
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