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Zinc and calcium modulate mitochondrial redox state and morphofunctional integrity
Mahmoud S Sharaf1, Michael R van den Heuvel2, Don Stevens3
1Department of Biomedical Sciences, Atlantic Veterinary College, University of Prince Edward Island, Charlottetown, PE C1A 4P3, Canada; Faculty of Veterinary Medicine, Cairo University, Giza 12211, Egypt.
Free Radical Biology & Medicine
|April 6, 2015
Summary
Zinc and calcium are vital for cell health, influencing mitochondrial function. This study reveals their complex interactions, impacting cellular redox state and energy production, with implications for disease.
Area of Science:
- Mitochondrial biology
- Cellular homeostasis
- Redox signaling
Background:
- Zinc and calcium play crucial roles in cellular functions.
- Their intricate interplay is essential for maintaining cellular balance.
- Mitochondrial function is sensitive to cation concentrations.
Purpose of the Study:
- To introduce a novel flow cytometry technique for real-time mitochondrial redox state measurement.
- To investigate the individual and combined effects of zinc and calcium on mitochondrial parameters.
- To elucidate the synergistic and antagonistic interactions between zinc and calcium in mitochondria.
Main Methods:
- Development of a real-time flow cytometric assay for mitochondrial redox state.
- Assessment of mitochondrial hydrogen peroxide (H2O2) production.
- Measurement of mitochondrial membrane potential (ΔΨm), oxidative phosphorylation (OXPHOS), and complex I activity.
- Evaluation of mitochondrial morphology and structural integrity.
Main Results:
- Zinc and calcium modulated mitochondrial H2O2 production differently at low and high doses.
- Combined zinc and calcium synergistically altered mitochondrial redox state.
- Antioxidants like vitamin E and N-acetylcysteine exhibited pro-oxidant effects at low doses.
- Zinc and calcium exhibited differential and synergistic effects on OXPHOS, ΔΨm, and mitochondrial morphology.
Conclusions:
- Zinc and calcium are critical regulators of mitochondrial redox balance and functional integrity.
- Unrecognized bidirectional interactions between zinc and calcium significantly influence mitochondrial function.
- These interactions offer potential targets for modulating mitochondrial function in health and disease.
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