Cited by 43Mitochondrial Function and PathologyCardiac electrophysiology and arrhythmiasCardiac Ischemia and Reperfusion

Rapid frequency-dependent changes in free mitochondrial calcium concentration in rat cardiac myocytes

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Wüst, Rob C. I., Helmes, Michiel, Martin, Jody L., van der Wardt, Thomas J. T., Musters, René J. P., van der Velden, Jolanda, Stienen, Ger J. M.·2017·The Journal of Physiology

Abstract

Key points Calcium ions regulate mitochondrial ATP production and contractile activity and thus play a pivotal role in matching energy supply and demand in cardiac muscle. The magnitude and kinetics of the changes in free mitochondrial calcium concentration in cardiac myocytes are largely unknown. Rapid stimulation frequency‐dependent increases but relatively slow decreases in free mitochondrial calcium concentration were observed in rat cardiac myocytes. This asymmetry caused a rise in the mitochondrial calcium concentration with stimulation frequency. These results provide insight into the mechanisms of mitochondrial calcium uptake and release that are important in healthy and diseased myocardium. Abstract Calcium ions regulate mitochondrial ATP production and contractile activity and thus play a pivotal role in matching energy supply and demand in cardiac muscle. Little is known about the magnitude and kinetics of the changes in free mitochondrial calcium concentration in cardiomyocytes. Using adenoviral infection, a ratiometric mitochondrially targeted Förster resonance energy transfer (FRET)‐based calcium indicator (4mtD3cpv, MitoCam) was expressed in cultured adult rat cardiomyocytes and the free mitochondrial calcium concentration ([Ca2+]m) was measured at different stimulation frequencies (0.1–4 Hz) and external calcium concentrations (1.8–3.6 mm) at 37°C. Cytosolic calcium concentrations were assessed under the same experimental conditions in separate experiments using Fura‐4AM. The increases in [Ca2+]m during electrical stimulation at 0.1 Hz were rapid (rise time = 49 ± 2 ms), while the decreases in [Ca2+]m occurred more slowly (decay half time = 1.17 ± 0.07 s). Model calculations confirmed that this asymmetry caused the rise in [Ca2+]m during diastole observed at elevated stimulation frequencies. Inhibition of the mitochondrial sodium–calcium exchanger (mNCE) resulted in a rise in [Ca2+]m at baseline and, paradoxically, in an acceleration of Ca2+ release. In conclusion: rapid increases in [Ca2+]m allow for fast adjustment of mitochondrial ATP production to increases in myocardial demand on a beat‐to‐beat basis and mitochondrial calcium release depends on mNCE activity and mitochondrial calcium buffering.

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Crossref · 10.1113/jp273589

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  • Contraction-induced calcium uptake acutely increases OXPHOS and augments glucose transport and stimulates lipid uptake and oxidation through MEF2-induced expression of GLUT4 and PGC1α, respectively.

    “Contraction-induced calcium uptake acutely increases OXPHOS (94, 177) and augments glucose transport and stimulates lipid uptake and oxidation through MEF2-induced expression of GLUT4 and PGC1α, respectively.”

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Authors
Wüst, R. C. I., Helmes, M., Martin, J. L., van der Wardt, T. J. T., Musters, R. J. P., van der Velden, J., & Stienen, G. J. M.
Affiliations
  • Amsterdam Cardiovascular Sciences (NL)
  • Cell and Molecular Physiology Loyola University Chicago IL USA
  • Department of Physiology, Institute for Cardiovascular Research VU University Medical Centre Amsterdam the Netherlands
Corresponding author
Stienen, Ger J. M.
Venue
The Journal of Physiology
Publisher
Wiley
Published
2017-02-22
Volume
595
Issue
6
Pages
2001-2019
ISSN
  • 0022-3751 (ISSN-L)
  • 1469-7793
OpenAlex
W2563463506
Cited by
43
References
49
Citations by year
2026: 1 · 2025: 4 · 2024: 3 · 2023: 5 · 2022: 6 · 2021: 3 · 2020: 6 · 2019: 6 · 2018: 8 · 2017: 1
FWCI
2.35
Type
journal article
Language
en
Open access
Locations
  • The Journal of Physiology (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
  • Pure Amsterdam UMC (publishedVersion, other-oa)
  • VU Research Portal (publishedVersion, other-oa)
  • Data Archiving and Networked Services (DANS) (submittedVersion)
Funders
  • Hartstichting
  • European Commission (FP7‐Health‐2010, 261409)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Mitochondrial Function and Pathology
  • Health Sciences › Medicine › Cardiology and Cardiovascular Medicine › Cardiac electrophysiology and arrhythmias
  • Health Sciences › Medicine › Pathology and Forensic Medicine › Cardiac Ischemia and Reperfusion
Keywords
cardiomyocytes, stimulation frequency, mitochondrial calcium uptake, mitochondrial calcium release, mitochondrial calcium buffering, mitochondrial ATP production, energy supply and demand, intracellular calcium, electrical stimulation
MeSH terms
Adenosine Triphosphate, Animals, Calcium, Cytosol, Electric Stimulation, Mitochondria, Heart, Rats, Wistar, Sodium-Calcium Exchanger, Myocytes, Cardiac

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