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Related Experiment Videos

Physiological cytosolic Ca2+ transients evoke concurrent mitochondrial depolarizations

L M Loew1, W Carrington, R A Tuft

  • 1Department of Physiology, University of Connecticut Health Center, Farmington 06030.

Proceedings of the National Academy of Sciences of the United States of America
|December 20, 1994
PubMed
Summary

Rising calcium levels in cells cause mitochondria to temporarily lose power. This suggests mitochondria help meet increased energy demands during cell activation by utilizing their electrochemical potential.

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Area of Science:

  • Cellular biology
  • Mitochondrial function
  • Calcium signaling

Background:

  • Calcium (Ca2+) acts as a crucial second messenger in cellular activation.
  • Mitochondrial dehydrogenases are known to be stimulated by calcium.
  • A hypothesis exists that calcium activates mitochondrial energy production during cell activation.

Purpose of the Study:

  • To investigate the direct effect of cytosolic calcium on mitochondrial membrane potential in live cells.
  • To determine if calcium influx into mitochondria impacts cellular energy production.

Main Methods:

  • Quantitative three-dimensional microscopy was employed.
  • Ratio imaging techniques were used to measure mitochondrial membrane potential.
  • Cytosolic calcium distribution was simultaneously monitored in live cells.

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Main Results:

  • Mitochondria exhibited reversible depolarization in response to rising cytosolic calcium levels.
  • This depolarization occurred in conjunction with physiological stimulation.
  • The mitochondrial response followed the transient rise and fall of cytosolic calcium.

Conclusions:

  • The primary mitochondrial response to increased cytosolic calcium is a draw on its electrochemical potential.
  • This suggests mitochondria play a role in meeting increased cellular energy demands during activation.
  • Mitochondria may accelerate ATP synthesis and aid calcium homeostasis in response to calcium signals.