Potassium and the kidney: a reciprocal relationship with clinical relevance

Michiel L.A.J. Wieërs, Jaap Mulder, Joris I. Rotmans, Ewout J. Hoorn*

*Corresponding author for this work

Research output: Contribution to journalReview articleAcademicpeer-review

1 Citation (Scopus)
2 Downloads (Pure)

Abstract

By controlling urinary potassium excretion, the kidneys play a key role in maintaining whole-body potassium homeostasis. Conversely, low urinary potassium excretion (as a proxy for insufficient dietary intake) is increasingly recognized as a risk factor for the progression of kidney disease. Thus, there is a reciprocal relationship between potassium and the kidney: the kidney regulates potassium balance but potassium also affects kidney function. This review explores this relationship by discussing new insights into kidney potassium handling derived from recently characterized tubulopathies and studies on sexual dimorphism. These insights reveal a central but non-exclusive role for the distal convoluted tubule in sensing potassium and subsequently modifying the activity of the sodium-chloride cotransporter. This is another example of reciprocity: activation of the sodium-chloride cotransporter not only reduces distal sodium delivery and therefore potassium secretion but also increases salt sensitivity. This mechanism helps explain the well-known relationship between dietary potassium and blood pressure. Remarkably, in children, blood pressure is related to dietary potassium but not sodium intake. To explore how potassium deficiency can cause kidney injury, we review the mechanisms of hypokalemic nephropathy and discuss if these mechanisms may explain the association between low dietary potassium intake and adverse kidney outcomes. We discuss if potassium should be repleted in patients with kidney disease and what role dietary potassium plays in the risk of hyperkalemia. Supported by data and physiology, we reach the conclusion that we should view potassium not only as a potentially dangerous cation but also as a companion in the battle against kidney disease.

Original languageEnglish
Pages (from-to)2245-2254
Number of pages10
JournalPediatric Nephrology
Volume37
Issue number10
DOIs
Publication statusPublished - Oct 2022

Bibliographical note

Funding Information:
This work was funded by the Dutch Kidney Foundation (grants CP16.01 and 21OK + 13).

Publisher Copyright:
© 2022, The Author(s).

Fingerprint

Dive into the research topics of 'Potassium and the kidney: a reciprocal relationship with clinical relevance'. Together they form a unique fingerprint.

Cite this