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10.1097/MNH.0000000000000248

http://scihub22266oqcxt.onion/10.1097/MNH.0000000000000248
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27306796!4974141!27306796
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suck abstract from ncbi


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pmid27306796      Curr+Opin+Nephrol+Hypertens 2016 ; 25 (5): 429-35
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  • Basolateral Kir4 1 activity in the distal convoluted tubule regulates K secretion by determining NaCl cotransporter activity #MMPMID27306796
  • Wang WH
  • Curr Opin Nephrol Hypertens 2016[Sep]; 25 (5): 429-35 PMID27306796show ga
  • PURPOSE OF REVIEW: Renal potassium (K) secretion plays a key role in maintaining K homeostasis. The classic mechanism of renal K secretion is focused on the connecting tubule and cortical collecting duct, in which K is uptaken by basolateral Na-K-ATPase and is secreted into the lumen by apical ROMK (Kir1.1) and Ca-activated big conductance K channel. Recently, genetic studies and animal models have indicated that inwardly rectifying K channel 4.1 (Kir4.1 or Kcnj10) in the distal convoluted tubule (DCT) may play a role in the regulation of K secretion in the aldosterone-sensitive distal nephron by targeting the NaCl cotransporter (NCC). This review summarizes recent progresses regarding the role of Kir4.1 in the regulation of NCC and K secretion. RECENT FINDINGS: Kir4.1 is expressed in the basolateral membrane of the DCT, and plays a predominant role in contributing to the basolateral K conductance and in participating in the generation of negative membrane potential. Kir4.1 is also the substrate of src-family tyrosine kinase and the stimulation of src-family tyrosine kinase activates Kir4.1 activity in the DCT. The genetic deletion or functional inhibition of Kir4.1 depolarizes the membrane of the DCT, inhibits ste20-proline-alanine rich kinase, and suppresses NCC activity. Moreover, the downregulation of Kir4.1 increases epithelial Na channel expression in the collecting duct and urinary K excretion. Finally, mice with low Kir4.1 activity in the DCT are hypomagnesemia and hypokalemia. SUMMARY: Recent progress in exploring the regulation and the function of Kir4.1 in the DCT strongly indicates that Kir4.1plays an important role in initiating the regulation of renal K secretion by targeting NCC and it may serves as a K sensor in the kidney.
  • |Animals[MESH]
  • |Cell Membrane/metabolism[MESH]
  • |Humans[MESH]
  • |Ion Transport[MESH]
  • |Kidney Tubules, Distal/*metabolism[MESH]
  • |Membrane Potentials[MESH]
  • |Potassium Channels, Inwardly Rectifying/genetics/*metabolism[MESH]
  • |Potassium/*metabolism[MESH]


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