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Related Experiment Videos

Skeletal muscle regulates extracellular potassium.

Alicia A McDonough1, Curtis B Thompson, Jang H Youn

  • 1Department of Physiology and Biophysics, University of Southern California Keck School of Medicine, Los Angeles, California 90089-9142, USA. mcdonoug@hsc.usc.edu

American Journal of Physiology. Renal Physiology
|May 9, 2002
PubMed
Summary

Dietary potassium restriction causes insulin resistance in cellular potassium uptake, impacting skeletal muscle and kidney function. This study reveals how P-type ATPases regulate potassium homeostasis and highlights early insulin resistance before molecular changes.

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Area of Science:

  • Physiology
  • Molecular Biology
  • Renal Science

Background:

  • Extracellular fluid (ECF) potassium concentration ([K+]) is tightly regulated by the kidney and skeletal muscle.
  • P-type ATPases, specifically H,K-ATPase and Na,K-ATPase, are crucial for maintaining potassium homeostasis.
  • Dietary potassium deprivation alters the expression of these ATPases in the kidney and skeletal muscle.

Purpose of the Study:

  • To investigate the physiological impact of potassium deprivation on cellular potassium uptake.
  • To understand the role of P-type ATPase regulation in potassium homeostasis.
  • To assess insulin-stimulated cellular potassium uptake in vivo using a novel "K+ clamp" technique.

Main Methods:

  • Developed and utilized a "K+ clamp" method in conscious rats to measure insulin-stimulated cellular K+ uptake in vivo.

Related Experiment Videos

  • Assessed exogenous K+ infusion rates required to maintain constant plasma [K+] during insulin infusion.
  • Combined molecular analyses of P-type ATPase expression with in vivo analyses of cellular K+ uptake and excretion.

    • Main Results:

    • Potassium deprivation induces near-complete insulin resistance of cellular K+ uptake.
    • Insulin resistance can manifest before significant decreases in plasma [K+] or muscle Na+ pump expression.
    • Skeletal muscle exhibits isoform-specific and muscle-specific regulation of Na,K-ATPase alpha(2)-isoform during K+ deprivation.

    Conclusions:

    • Potassium homeostasis is maintained by coordinated kidney and skeletal muscle responses involving P-type ATPases.
    • Potassium deprivation leads to insulin resistance in cellular K+ uptake, impacting overall potassium balance.
    • The "K+ clamp" is a valuable tool for studying disrupted potassium homeostasis and its mechanisms.