Cited by 65Cardiac Ischemia and ReperfusionEstrogen and related hormone effectsCardiac electrophysiology and arrhythmias

Low concentrations of 17β-estradiol protect single cardiac cells against metabolic stress-induced Ca2+ loading

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Jovanović, Sofija, Jovanović, Aleksandar, Shen, Win K, Terzic, Andre·2000·Journal of the American College of Cardiology

Abstract

Objectives The main objective of the present study was to determine whether low physiological levels of estrogen directly protect cardiac cells against metabolic stress.Background The beneficial effect of estrogens on the cardiovascular system has been traditionally ascribed to decrease in peripheral vascular resistance and to an antiatherogenic action. Whether physiological concentrations of 17beta-estradiol (E2) are also able to protect cardiomyocytes against metabolic insult directly is unknown.Methods Isolated ventricular cardiomyocytes were loaded with the Ca2+-sensitive fluorescent dye Fluo-3 and imaged by a digital epifluorescence imaging system. In cardiac cells preincubated with hormones and/or drugs for 8 h, metabolic stress was induced by addition and removal of 2,4-dinitrophenol (DNP).Results In cardiomyocytes, a 3-min-long exposure to chemical hypoxia, followed by reoxygenation, produced intracellular Ca2+ loading independently of gender (female: 729 +/- 88 nmol/liter; male: 778 +/- 97 nmol/liter). Pretreatment with E2 (10 nmol/liter) significantly reduced the magnitude of hypoxia/reoxygenation-induced Ca2+ loading in female (E2-treated: 298 +/- 39 nmol/liter; untreated: 729 +/- 88 nmol/liter), but not in male (E2-treated: 1029 +/- 177 nmol/liter; untreated: 778 +/- 97 nmol/liter) cardiac cells. The protective action of E2 was not mimicked by the inactive estrogen stereoisomer, 10 nmol/liter 17alpha estradiol (17alpha estradiol-treated: 886 +/- 122 nmol/liter; untreated: 729 +/- 88 nmol/liter), and was abolished by tamoxifen (1 micromol/liter), which acts as an antagonist of E2 on estrogen receptors (E2 plus tamoxifen-treated: 702 +/- 98 nmol/liter; untreated: 729 +/- 88 nmol/liter).Conclusions In a gender-dependent manner, E2 directly protects cardiac cells against hypoxia-reoxygenation injury through an estrogen receptor-mediated mechanism. Such property of E2 may contribute to cardioprotection in the female gender.

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  • The bulk of studies evaluating sex differences in the AF-related risk of heart failure have showed no significant difference; however, a few studies have suggested higher risk in women.

    “The bulk of studies evaluating sex differences in the AF-related risk of HF have showed no significant difference; however, a few studies have suggested higher risk in women (Supplementary Table S8).”

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Authors
Jovanović, S., Jovanović, A., Shen, W. K., & Terzic, A.
Affiliations
Mayo Clinic (US)
Corresponding author
Jovanović, Aleksandar
Venue
Journal of the American College of Cardiology
Publisher
Elsevier BV
Published
2000-09
Volume
36
Issue
3
Pages
948-952
ISSN
0735-1097 (ISSN-L)
OpenAlex
W2035219321
Cited by
65
References
24
Citations by year
2026: 2 · 2025: 1 · 2023: 1 · 2021: 3 · 2019: 5 · 2017: 1 · 2016: 3 · 2013: 1 · 2012: 6
FWCI
1.72
Type
journal article
Language
en
Open access
Locations
  • Journal of the American College of Cardiology (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • American Heart Association
  • University of Dundee
  • Wellcome Trust (059528/Z/99/Z/JMW/CP/JF, 059528)
  • British Heart Foundation
  • Tenovus
Topics
  • Health Sciences › Medicine › Pathology and Forensic Medicine › Cardiac Ischemia and Reperfusion
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Estrogen and related hormone effects
  • Health Sciences › Medicine › Cardiology and Cardiovascular Medicine › Cardiac electrophysiology and arrhythmias
Keywords
estradiol, estrogen cardioprotection, cardiomyocytes, metabolic stress, hypoxia/reoxygenation injury, estrogen receptor, tamoxifen, 17α-estradiol, sex differences, 2,4-dinitrophenol, ischemia-reperfusion injury
MeSH terms
Animals, Hypoxia, Calcium, Estradiol, Estrogen Antagonists, Female, Guinea Pigs, Male, Myocardium, Osmolar Concentration, Oxygen, Sex Characteristics, Stress, Physiological, Tamoxifen

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