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Related Experiment Videos

Potassium homeostasis: ontogenic aspects

R Aizman1, L Grahnquist, G Celsi

  • 1Department of Human Physiology, Pedagogical University, Novosibirsk, Russia.

Acta Paediatrica (Oslo, Norway : 1992)
|August 1, 1998
PubMed
Summary

Infants require higher potassium (K+) retention for growth, necessitating distinct regulatory mechanisms. This review highlights immature gut absorption, reduced kidney excretion, and altered distribution contributing to positive K+ balance in infants.

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Area of Science:

  • Physiology
  • Developmental Biology
  • Biochemistry

Background:

  • Potassium (K+) is a crucial intracellular cation vital for numerous cellular functions.
  • Infant potassium homeostasis differs significantly from adults due to growth and developmental needs.
  • Adequate K+ retention is essential in infants to prevent growth retardation.

Purpose of the Study:

  • To review literature on potassium balance regulation during infant development (ontogeny).
  • To examine the roles of the gastrointestinal tract, kidneys, and tissue stores in infant K+ homeostasis.
  • To elucidate the unique mechanisms governing internal and external K+ balances in infants.

Main Methods:

  • Literature review focusing on potassium balance during ontogeny.
  • Analysis of K+ excretion and distribution mechanisms in developing infants.

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  • Examination of the gastrointestinal tract, kidney, and tissue stores' roles.

    • Main Results:

    • Infant positive K+ balance is characterized by increased gut absorption and decreased kidney secretion/excretion.
    • Immature mechanisms for regulating intra/extracellular K+ distribution are observed in infants.
    • Factors include higher absorptive transporter expression, lower secretive transporter expression, and reduced renal K+ excretion post-loading.

    Conclusions:

    • Infant K+ regulation involves enhanced gut absorption and reduced renal excretion.
    • Immaturity in tissue distribution mechanisms and neuro-hormonal control contributes to positive K+ balance.
    • Developmental differences in K+ transport mechanisms are critical for infant growth and homeostasis.