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  3. Potassium Ion Homeostasis Modulates Mitochondrial Function.
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  3. Potassium Ion Homeostasis Modulates Mitochondrial Function.

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Potassium ion homeostasis modulates mitochondrial function.

Adam James Waite1, Beiduo Rao1, Elizabeth Schinski1

  • 1Calico Life Sciences LLC , South San Francisco, CA, USA.

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|January 13, 2026

View abstract on PubMed

Summary
This summary is machine-generated.

Reducing internal potassium in cells increases mitochondrial membrane potential (MMP) and extends lifespan. This finding suggests targeting potassium levels could be a strategy for healthier aging.

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Area of Science:

  • Cell Biology
  • Aging Research
  • Mitochondrial Biology

Background:

  • Age-associated decline in mitochondrial membrane potential (MMP) is linked to aging and related diseases.
  • The causal role of MMP decline in aging remains unclear, questioning the viability of interventions targeting MMP.

Purpose of the Study:

  • To identify genetic factors influencing age-associated MMP decline using a screening platform.
  • To investigate whether modulating MMP can impact lifespan and promote healthier aging.

Main Methods:

  • Developed a screening platform in Saccharomyces cerevisiae (yeast) to identify mutations affecting MMP.
  • Characterized the longest-lived mutant to understand the mechanisms of MMP maintenance and lifespan extension.
  • Tested interventions including gene deletion, enzyme activity modulation, and environmental potassium reduction.

Main Results:

  • Identified mutations that slowed or prevented age-associated MMP decline.
  • A longest-lived mutant exhibited increased MMP and extended lifespan due to reduced internal potassium.
  • Specific interventions, including deleting a potassium transporter and reducing environmental potassium, improved cellular MMP and lifespan.
  • In isolated mitochondria, reduced potassium concentration directly increased MMP.

Conclusions:

  • Internal potassium levels critically regulate mitochondrial function and cellular lifespan.
  • Modulating intracellular potassium is a viable strategy to enhance mitochondrial membrane potential and promote healthier aging.