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Potassium acts through mTOR to regulate its own secretion.

Mads Vaarby Sørensen1,2, Bidisha Saha3, Iben Skov Jensen1

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Summary

Potassium (K+) is sensed by kidney principal cells, activating mTORC2 and SGK1 to stimulate ENaC and enhance K+ excretion independently of aldosterone. This mechanism aids in maintaining electrolyte balance.

Keywords:
Cell BiologyHomeostasisNephrologySignal transductionSodium channels

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Area of Science:

  • Nephrology
  • Cellular Physiology
  • Endocrinology

Background:

  • Potassium (K+) secretion by kidney principal cells is crucial for electrolyte homeostasis.
  • Aldosterone regulates K+ secretion partly by stimulating SGK1, which affects the epithelial sodium channel (ENaC).
  • An aldosterone-independent pathway for K+ regulation in principal cells has been hypothesized.

Purpose of the Study:

  • To investigate whether K+ itself can directly regulate K+ secretion in kidney principal cells.
  • To identify the signaling pathways involved in K+ sensing and secretion.
  • To elucidate the role of mTORC2 and SGK1 in this aldosterone-independent pathway.

Main Methods:

  • Studied K+ secretion in kidney principal cells.
  • Investigated the role of mTORC2 and SGK1 signaling.
  • Assessed the impact of varying extracellular K+ concentrations.
  • Examined the requirement for basolateral membrane K+-channel activity.

Main Results:

  • K+ directly activates SGK1 via mTORC2 in principal cells, enhancing ENaC activity and K+ excretion.
  • This activation is dependent on blood-side K+ concentration and basolateral K+ channel activity.
  • The observed effect is independent of aldosterone levels and increased distal Na+ delivery.

Conclusions:

  • Kidney principal cells directly sense K+ levels to regulate their own secretion.
  • The mTORC2-SGK1 signaling module is a key mediator of K+-stimulated K+ excretion.
  • This local sensing mechanism complements systemic hormonal and nephron delivery signals for robust K+ homeostasis.