Cited by 41Hormonal and reproductive studiesMitochondrial Function and PathologyCardiac Ischemia and Reperfusion

Testosterone replacement attenuates mitochondrial damage in a rat model of myocardial infarction

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Wang, Fengyue, Yang, Jing, Sun, Junfeng, Dong, Yanli, Zhao, Hong, Shi, Hui, Fu, Lu·2015·Journal of Endocrinology

Abstract

Testosterone can affect cardiovascular disease, but its effects on mitochondrial dynamics in the post-infarct myocardium remain unclear. To observe the effects of testosterone replacement, a rat model of castration-myocardial infarction (MI) was established by ligating the left anterior descending coronary artery 2 weeks after castration with or without testosterone treatment. Expression of mitochondrial fission and fusion proteins was detected by western blot and immunofluorescence 14 days after MI. Cardiac function, myocardial inflammatory infiltration and fibrosis, cardiomyocyte apoptosis, mitochondrial microstructure, and ATP levels were also assessed. Compared with MI rats, castrated rats showed aggravated mitochondrial and myocardial insults, including mitochondrial swelling and disordered arrangement; loss of cristae, reduced mitochondrial length; decreased ATP levels; cardiomyocyte apoptosis; and impaired cardiac function. Results of western blotting analyses indicated that castration downregulated peroxisome proliferator-activated receptor gamma coactivator 1-alpha (PGC1A) and mitofusin 2, but upregulated dynamin-related protein 1. The results were also supported by results obtained using immunofluorescence. However, these detrimental effects were reversed by testosterone supplementation, which also elevated the upstream AMP-activated protein kinase (AMPK) activation of PGC1A. Thus, testosterone can protect mitochondria in the post-infarct myocardium, partly via the AMPK-PGC1A pathway, thereby decreasing mitochondrial dysfunction and cardiomyocyte apoptosis. The effects of testosterone were confirmed by the results of ELISA analyses.

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  • Knockout of AR results in the down-regulation of PGC-1α and TFAM in the muscle of castrated rats and mice, while the administration of exogenous androgen reversed these effects.

    “It has been reported that knockout of AR results in the down-regulation of PGC-1α and TFAM in the muscle of castrated rats and mice, while the administration of exogenous androgen reversed these effects (144, 145).”

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Authors
Wang, F., Yang, J., Sun, J., Dong, Y., Zhao, H., Shi, H., & Fu, L.
Affiliations
Harbin Medical University (CN)
Venue
Journal of Endocrinology
Published
2015-03-13
Volume
225
Issue
2
Pages
101-111
ISSN
  • 0022-0795 (ISSN-L)
  • 1479-6805
OpenAlex
W2103911029
Cited by
41
References
40
Citations by year
2026: 3 · 2025: 2 · 2024: 2 · 2023: 9 · 2022: 6 · 2021: 5 · 2020: 6 · 2019: 3 · 2018: 2 · 2017: 2 · 2016: 1
FWCI
1.45
Type
journal article
Language
en
Open access
Locations
  • Journal of Endocrinology (publishedVersion)
  • PubMed (publishedVersion)
Funders
Department of Education, Heilongjiang Province
Topics
  • Health Sciences › Medicine › Endocrinology, Diabetes and Metabolism › Hormonal and reproductive studies
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Mitochondrial Function and Pathology
  • Health Sciences › Medicine › Pathology and Forensic Medicine › Cardiac Ischemia and Reperfusion
Keywords
testosterone replacement therapy, myocardial infarction, mitochondrial dysfunction, mitochondrial dynamics, mitochondrial fission and fusion, castration, PGC-1α, AMPK, mitofusin 2, Drp1, cardiomyocyte apoptosis, myocardial fibrosis, myocarditis, cardiac function, ATP levels
MeSH terms
Adenosine Triphosphate, Animals, Disease Models, Animal, Humans, Male, Mitochondria, Myocardial Infarction, Testosterone, Rats, Wistar, Apoptosis, Hormone Replacement Therapy, Myocytes, Cardiac, PPAR gamma, Rats, AMP-Activated Protein Kinases

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