Kir4.1/Kir5.1 in the DCT plays a role in the regulation of renal K + excretion
The aim of this mini review is to provide an overview regarding the role of inwardly rectifying potassium channel 4.1 (Kir4.1)/Kir5.1 in regulating renal K excretion. Deletion of Kir4.1 in the kidney inhibited thiazide-sensitive NaCl cotransporter (NCC) activity in the distal convoluted tubule (DCT)...
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Published in | American journal of physiology. Renal physiology Vol. 316; no. 3; pp. F582 - F586 |
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Main Authors | , , |
Format | Journal Article |
Language | English |
Published |
United States
American Physiological Society
01.03.2019
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Subjects | |
Online Access | Get full text |
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Summary: | The aim of this mini review is to provide an overview regarding the role of inwardly rectifying potassium channel 4.1 (Kir4.1)/Kir5.1 in regulating renal K
excretion. Deletion of Kir4.1 in the kidney inhibited thiazide-sensitive NaCl cotransporter (NCC) activity in the distal convoluted tubule (DCT) and slightly suppressed Na-K-2Cl cotransporter (NKCC2) function in the thick ascending limb (TAL). Moreover, increased dietary K
intake inhibited, whereas decreased dietary K
intake stimulated, the basolateral potassium channel (a Kir4.1/Kir5.1 heterotetramer) in the DCT. The alteration of basolateral potassium conductance is essential for the effect of dietary K
intake on NCC because deletion of Kir4.1 in the DCT abolished the effect of dietary K
intake on NCC. Since potassium intake-mediated regulation of NCC plays a key role in regulating renal K
excretion and potassium homeostasis, the deletion of Kir4.1 caused severe hypokalemia and metabolic alkalosis under control conditions and even during increased dietary K
intake. Finally, recent studies have suggested that the angiotensin II type 2 receptor (AT2R) and bradykinin-B2 receptor (BK2R) are involved in mediating the effect of high dietary K
intake on Kir4.1/Kir5.1 in the DCT. |
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Bibliography: | ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 |
ISSN: | 1931-857X 1522-1466 |
DOI: | 10.1152/ajprenal.00412.2018 |