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Dehydroepiandrosterone reverses chronic hypoxia/reoxygenation-induced right ventricular dysfunction in rats
Eric Dumas de La Roque1, Nadège Bellance, Rodrigue Rossignol
1Centre de Recherche Cardio-Thoracique U 1045, INSERM U 1045, U 688 and U 1034, INSERM U 1045, U 688 and U 1034, Bordeaux Cedex, France. edumasdlr@gmail.com
The European Respiratory Journal
|April 24, 2012
Summary
Dehydroepiandrosterone (DHEA) prevents right ventricle dysfunction after chronic hypoxia recovery in rats. This hormone supports cardiomyocyte health, mitigating diastolic and systolic impairments in heart recovery models.
Area of Science:
- Cardiovascular Physiology
- Endocrinology
Background:
- Chronic hypoxia induces pulmonary hypertension and right ventricle dysfunction.
- Reoxygenation reverses pulmonary hypertension but not right ventricle dysfunction.
Purpose of the Study:
- To investigate the effect of Dehydroepiandrosterone (DHEA) on right ventricle function during recovery from chronic hypoxia.
- To determine if DHEA can prevent or reverse right ventricle dysfunction after reoxygenation.
Main Methods:
- Animal model: Rats exposed to chronic hypoxia followed by a normoxic recovery phase.
- Groups: Control, recovery (hypoxia then normoxia), and recovery with DHEA treatment.
- Assessment: In vivo Doppler echocardiography and in vitro isolated perfused heart technique; histological analysis of right ventricle tissue.
Main Results:
- DHEA treatment preserved right ventricle diastolic function, maintaining echographic E wave velocity near control levels.
- DHEA prevented right ventricle systolic dysfunction, indicated by normalized pressure-volume curve slopes in isolated hearts.
- Histological analysis revealed DHEA's effect was linked to cardiomyocyte proliferation and prevention of cellular alterations.
Conclusions:
- Dehydroepiandrosterone (DHEA) effectively prevents right ventricle diastolic and systolic dysfunction following recovery from chronic hypoxia in a rat model.
- DHEA's protective effects are associated with promoting cardiomyocyte proliferation and mitigating cellular damage.