Testosterone negatively regulates right ventricular
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Testosterone negatively regulates right ventricular
The effects of testosterone on RV structure and function in load stress are presently unknown. ... levels of the anabolic sex hormones testosterone in men and.
Research A r t i cl e
Testosterone negatively regulates right ventricular load stress responses in mice Anna R. Hemnes1, Karen B. Maynard1, Hunter C. Champion2, Linda Gleaves1, Niki Penner1, James West1, and John H. Newman1 1
Division of Allergy, Pulmonary and Critical Care Medicine, Vanderbilt University Medical Center, Nashville, Tennessee, USA, 2 Division of Cardiology, University of Pittsburgh Medical Center, Pittsburgh, Pennsylvania, USA
ABSTRACT Right ventricular (RV) function is the major determinant of mortality in pulmonary arterial hypertension and male sex is a strong predictor of mortality in this disease. The effects of testosterone on RV structure and function in load stress are presently unknown. We tested whether testosterone levels affect RV hypertrophic responses, fibrosis, and function. Male C57BL/6 mice underwent castration or sham followed by pulmonary artery banding (PAB) or sham. After recovery, testosterone pellets were placed in a subset of the castrated mice and mice were maintained for at least two weeks, when they underwent hemodynamic measurements and tissues were harvested. Plasma levels of testosterone were reduced by castration and repleted by testosterone administration. In PAB, castration resulted in lower right ventricle/left ventricle + septum (RV/LV+S), and myocyte diameter (P
