Cited by 72Mitochondrial Function and PathologyCardiac Ischemia and ReperfusionCardiac electrophysiology and arrhythmias

Gender modulation of Ca2+ uptake in cardiac mitochondria

ARIELI, Y·2004·Journal of Molecular and Cellular Cardiology

Abstract

Background Mitochondrial calcium overload is an important factor in defining ischemia/reperfusion injury. Since pre-menopausal women are relatively protected from ischemia and heart disease, we tested the hypothesis that gender differences alter Ca(2+) handling in rat cardiac mitochondria.Methods Using cardiac mitochondria isolated from male, female, and ovariectomized Sprague-Dawley rats, we measured mitochondrial calcium transport, redox state, and membrane potential (Deltapsi(m)) during exposure to a calcium bolus. Redox state was modulated using either succinate (S) or succinate and pyruvate (SP) as substrates.Results Net Ca(2+) uptake rates were significantly lower in female than male mitochondria using SP, substrate conditions that resulted in a lower redox state (NADH/NAD(+)). Inhibition of the mitochondrial transition pore (MTP) using cyclosporin A showed significantly lower net Ca(2+) uptake in both substrate solutions when mitochondria from female and ovariectomized animals were compared to males, a finding consistent with gender modulation of the mitochondrial uniporter. Blockade of the Ca(2+) uniporter by ruthenium red abolished gender or substrate solution differences in calcium release. While there were no significant differences in resting Deltapsi(m), or Deltapsi(m) following Ca(2+) addition, 80% of female samples recovered from Ca(2+)-induced depolarization compared to 57% and 43% of male and ovariectomized animals, respectively.Conclusions Mitochondria from female hearts have lower Ca(2+) uptake rates under physiologic substrate solutions (succinate/pyruvate) and are able to appropriately maintain DeltaYm under conditions of high [Ca(2+)]. These differences are consistent with gender modulation of the Ca(2+) uniporter and may be a mechanism by which female myocardium suffers less injury with ischemia/reperfusion.

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Crossref · 10.1016/j.yjmcc.2004.04.023

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Authors
ARIELI, Y.
Affiliations
University of California, Davis (US)
Corresponding author
ARIELI, Y
Venue
Journal of Molecular and Cellular Cardiology
Publisher
Elsevier BV
Published
2004-08
Volume
37
Issue
2
Pages
507-513
ISSN
0022-2828 (ISSN-L)
OpenAlex
W2063830130
Cited by
72
References
30
Citations by year
2026: 2 · 2025: 4 · 2024: 3 · 2023: 3 · 2022: 5 · 2021: 3 · 2020: 7 · 2019: 8 · 2018: 4 · 2017: 4 · 2016: 2 · 2015: 5 · 2014: 2 · 2013: 2 · 2012: 3
FWCI
0.95
Type
journal article
Language
en
Open access
closed
Locations
  • Journal of Molecular and Cellular Cardiology (publishedVersion)
  • PubMed (publishedVersion)
Funders
American Heart Association
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Mitochondrial Function and Pathology
  • Health Sciences › Medicine › Pathology and Forensic Medicine › Cardiac Ischemia and Reperfusion
  • Health Sciences › Medicine › Cardiology and Cardiovascular Medicine › Cardiac electrophysiology and arrhythmias
Keywords
mitochondrial calcium uptake, heart mitochondria, sex differences, ovariectomy, mitochondrial calcium uniporter, cyclosporine, ruthenium red, mitochondrial membrane potential, mitochondrial redox state, succinic acid, pyruvate, ischemia-reperfusion injury
MeSH terms
Animals, Biological Transport, Calcium, Female, Male, Mitochondria, Myocardium, NAD, Sex Factors, Cyclosporine, Rats

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