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Mitochondrial calcium transport: physiological and pathological relevance

T E Gunter1, K K Gunter, S S Sheu

  • 1Department of Biophysics, University of Rochester, New York 14642.

The American Journal of Physiology
|August 1, 1994
PubMed
Summary

Mitochondria sequester calcium (Ca2+), impacting cellular energy production and metabolism. This review explores mitochondrial Ca2+ transport, its physiological roles, and implications in disease.

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Area of Science:

  • Biochemistry
  • Cell Biology
  • Physiology

Background:

  • Mitochondrial calcium (Ca2+) transport has been studied since the 1960s, yet its precise physiological role remains debated.
  • Key questions persist regarding why mitochondria sequester Ca2+ instead of ATP production and the function of dual efflux mechanisms.

Purpose of the Study:

  • To review and address the enigmatic relationship between mitochondrial Ca2+ transport mechanisms and their physiological functions.
  • To explore the role of intramitochondrial Ca2+ in metabolic control and its implications in pathological conditions.

Main Methods:

  • Literature review of existing research on mitochondrial Ca2+ transport.
  • Analysis of the characteristics of mitochondrial Ca2+ transport mechanisms, including the permeability transition.

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  • Examination of evidence for and against mitochondrial Ca2+ uptake in vivo.

    • Main Results:

    • Mitochondria play a complex role in cellular Ca2+ homeostasis, influencing energy metabolism.
    • Dual Ca2+ efflux mechanisms (Na+-independent and Na+-dependent) are involved, primarily driven by the pH gradient.
    • Mitochondrial Ca2+ transport is linked to the mitochondrial membrane permeability transition and cell damage.

    Conclusions:

    • Understanding mitochondrial Ca2+ transport is crucial for deciphering its role in cellular metabolism and disease.
    • Further research is needed to fully elucidate the in vivo functions and pathological relevance of mitochondrial Ca2+ handling.