Cited by 249Potassium and Related DisordersIon Transport and Channel RegulationParathyroid Disorders and Treatments

Extrarenal potassium homeostasis

Bia, M. J., DeFronzo, R. A.·1981·American Journal of Physiology-Renal Physiology

Abstract

Normal potassium homeostasis is regulated by both renal and extrarenal mechanisms. Although chronic potassium balance is primarily regulated by the kidneys, acute potassium tolerance is largely determined by extrarenal tissues. During the first 4-6 h following an acute potassium load, only about 50% of the potassium is excreted by the kidneys. Of the remaining 50% that is retained, over 80% is translocated into cells, and this provides the primary defense against hyperkalemia. Potassium uptake by both liver and muscle and intestinal secretion of potassium are the most important mechanisms of extrarenal potassium disposal. Several hormones, including insulin and epinephrine, have been shown to play an important role in the maintenance of normal extrarenal potassium metabolism. These hormones function by enhancing potassium uptake by liver and muscle. There is also evidence that aldosterone is necessary in the maintenance of normal extrarenal potassium tolerance. Although the major extrarenal site of action of aldosterone has not yet been clearly defined, gastrointestinal potassium secretion and muscle transport of potassium are both affected by the hormone. Evidence exists that glucocorticoids may also have an effect on extrarenal potassium homeostasis. In addition to this hormonal regulation, cellular shifts of potassium are influenced by changes in acid-base balance. Extrarenal potassium tolerance is impaired in chronic renal insufficiency. These uremia-related changes are discussed in the context of our present understanding of normal extrarenal potassium metabolism.

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Crossref · 10.1152/ajprenal.1981.240.4.f257

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  • After a K+ load, in the first 3-6 hours, only about 50% of the K+ load is excreted via urine; the remaining K+ load is excreted over the next 10 hours.

    “After a K+ load, in the first 3–6 hours, only about 50% of the K+ load is excreted via urine; the remaining K+ load is excreted over the next 10 hours [1, 12].”

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Authors
Bia, M. J., & DeFronzo, R. A.
Venue
American Journal of Physiology-Renal Physiology
Published
1981-04-01
Volume
240
Issue
4
Pages
F257-F268
ISSN
  • 1522-1466 (ISSN-L)
  • 1931-857X
OpenAlex
W2216918211
Cited by
249
References
0
Citations by year
2026: 5 · 2025: 2 · 2024: 6 · 2023: 3 · 2022: 6 · 2021: 5 · 2020: 6 · 2019: 1 · 2018: 4 · 2017: 7 · 2016: 7 · 2015: 2 · 2014: 4 · 2013: 6 · 2012: 5
FWCI
7.65
Type
journal article
Language
en
Open access
closed
Locations
  • American Journal of Physiology-Renal Physiology (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Health Sciences › Medicine › Pulmonary and Respiratory Medicine › Potassium and Related Disorders
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Ion Transport and Channel Regulation
  • Health Sciences › Medicine › Nephrology › Parathyroid Disorders and Treatments
Keywords
hyperkalemia, aldosterone, insulin, epinephrine, glucocorticoids, acid-base balance, chronic renal insufficiency, uremia
MeSH terms
Aldosterone, Animals, Dogs, Epinephrine, Glomerular Filtration Rate, Glucagon, Homeostasis, Humans, Hydrocortisone, Insulin, Kidney, Kidney Failure, Chronic, Male, Norepinephrine, Potassium, Prednisone, Somatostatin, Rats

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