Fe(2+) induces a transient Ca(2+) release from rat liver mitochondria

Vladimir Gogvadze¹, Patrick B Walter, Bruce N Ames

¹Department of Molecular and Cell Biology, University of California, Berkeley, California 94720, USA.

|February 8, 2002

Summary

Iron (Fe2+) exposure causes a transient calcium (Ca2+) release from mitochondria, affecting cellular steady states. This release mechanism involves the 2H+/Ca2+-exchange system and is influenced by Fe2+ concentration and Ca2+ loading.

Area of Science:

Mitochondrial Biology
Cellular Physiology
Biochemistry

Background:

Mitochondria play a crucial role in cellular calcium homeostasis.
Iron (Fe2+) is known to interact with mitochondrial function.
Understanding Fe2+-induced calcium dynamics is vital for cellular health.

Purpose of the Study:

To investigate the mechanism of Fe2+-induced calcium release from isolated mitochondria.
To elucidate the role of Fe2+ in mitochondrial calcium uptake and release.
To determine the impact of Fe2+ on mitochondrial calcium steady-state concentrations.

Main Methods:

Isolated mitochondria were loaded with calcium (Ca2+).
Exposure to varying concentrations of iron (Fe2+).
Measurement of mitochondrial Ca2+ uptake and release kinetics.
Assessment of the effect of cyclosporin A and lipid peroxidation.

Main Results:

Fe2+ induced a transient Ca2+ release from mitochondria, dependent on Ca2+ loading and Fe2+ concentration.
Fe2+ significantly inhibited mitochondrial Ca2+ uptake, altering the extramitochondrial Ca2+ steady state.
The Ca2+ release mechanism was identified as electroneutral 2H+/Ca2+-exchange, independent of lipid peroxidation.
Mitochondrial Ca2+ reuptake resumed after Fe2+ accumulation.

Conclusions:

Fe2+ disrupts mitochondrial calcium homeostasis through inhibition of Ca2+ uptake and transient Ca2+ release via the 2H+/Ca2+-exchange mechanism.
Fe2+ likely interferes with mitochondrial Ca2+ entry at the uniporter or is transported by it.
These findings shed light on the complex interplay between iron and mitochondrial calcium regulation.

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Fe(2+) induces a transient Ca(2+) release from rat liver mitochondria

Area of Science:

Background:

Purpose of the Study:

Main Methods:

Main Results:

Conclusions:

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