SPAK and OSR1 dependent down-regulation of murine renal outer medullary K channel ROMK1.

Abstract:

BACKGROUND/AIMS:The kinases SPAK (SPS1-related proline/alanine-rich kinase) and OSR1 (oxidative stress-responsive kinase 1) participate in the regulation of the NaCl cotransporter NCC and the Na+, K+, 2Cl- cotransporter NKCC2. The kinases are regulated by WNK (with-no-K[Lys]) kinases. Mutations of genes encoding WNK kinases underly Gordon's syndrome, a monogenic disease leading to hypertension and hyperkalemia. WNK kinases further regulate the renal outer medullary K+ channel ROMK1. The present study explored, whether SPAK and/or OSR1 have similarly the potential to modify the activity of ROMK1. METHODS:ROMK1 was expressed in Xenopus oocytes with or without additional expression of wild-type SPAK, constitutively active (T233E)SPAK, catalytically inactive (D212A)SPAK, wild-type OSR1, constitutively active (T185E)OSR1 and catalytically inactive (D164A)OSR1. Channel activity was determined utilizing dual electrode voltage clamp and ROMK1 protein abundance in the cell membrane utilizing chemiluminescence of ROMK1 containing an extracellular hemagglutinin epitope (ROMK1-HA). RESULTS:ROMK1 activity and ROMK1-HA protein abundance were significantly down-regulated by wild-type SPAK and (T233E)SPAK, but not by (D212A)SPAK. Similarly, ROMK1 activity and ROMK1-HA protein abundance were significantly down-regulated by wild-type OSR1 and (T185E)OSR1, but not by (D164A)OSR1. CONCLUSION:ROMK1 protein abundance and activity are down-regulated by SPAK and OSR1.

journal_name

Kidney Blood Press Res

authors

Elvira B,Munoz C,Borras J,Chen H,Warsi J,Ajay SS,Shumilina E,Lang F

doi

10.1159/000355812

subject

Has Abstract

pub_date

2014-01-01 00:00:00

pages

353-60

issue

4

eissn

1420-4096

issn

1423-0143

pii

000355812

journal_volume

39

pub_type

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