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Effect of testosterone on post-myocardial infarction remodeling and function
Matthias Nahrendorf1, Stefan Frantz, Kai Hu
1Medical University Hospital Wuerzburg, Josef-Schneider-Strasse 2, 97080 Wuerzburg, Germany.
Cardiovascular Research
|February 5, 2003
Summary
Testosterone treatment in male rats induced physiologic cardiac hypertrophy without negative effects after myocardial infarction (MI). Reduced cardiac wall stress suggests potential long-term benefits following MI.
Area of Science:
- Cardiovascular physiology
- Endocrinology
- Myocardial infarction research
Background:
- Sex steroids, particularly testosterone (T), play a role in coronary artery disease differences between sexes.
- Testosterone (T) therapy is increasingly common in aging males.
- Investigating the impact of anabolic testosterone (T) on cardiac remodeling post-myocardial infarction (MI) is crucial.
Purpose of the Study:
- To evaluate the effects of chronic anabolic testosterone (T) administration on left ventricular (LV) remodeling and function after myocardial infarction (MI).
Main Methods:
- Adult male rats received placebo, testosterone undecanoate (T), or were orchiectomized.
- Animals underwent sham surgery or myocardial infarction (MI) induction via coronary artery ligation.
- Left ventricular (LV) remodeling and function were assessed using serial MRI and hemodynamic measurements.
Main Results:
- Testosterone (T) administration induced cardiac hypertrophy with increased alpha-MHC and IGF-1 mRNA expression, indicative of a "physiologic" response.
- Infarct size and mortality were similar across groups post-MI.
- Testosterone (T) treatment reduced LV end-diastolic pressure and wall stress without altering other hemodynamic parameters.
Conclusions:
- Chronic anabolic testosterone (T) promotes a "physiologic" cardiac hypertrophy pattern, potentially mediated by IGF-1.
- Testosterone (T) treatment demonstrated no detrimental effects on outcomes after myocardial infarction (MI).
- Reduced LV wall stress and LVEDP following testosterone (T) therapy may offer improved long-term prognosis after MI.