Cellular Actions of Testosterone in Vascular Cells: Mechanism Independent of Aromatization to Estradiol

This study investigated the effects of testosterone on vascular cells, specifically focusing on whether these effects were independent of its conversion to estradiol. Using rat aortic endothelial and smooth muscle cells, it was found that testosterone increased nitric oxide production and stimulated muscle cell proliferation without being converted to estradiol. The use of an aromatase inhibitor confirmed that the effects were not due to estradiol conversion. The androgen receptor antagonist flutamide blocked the effects, while an estrogen receptor antagonist did not, further supporting the independence from estradiol. Additionally, testosterone prevented monocyte adhesion to endothelial cells and promoted muscle cell migration, indicating its role in modulating vascular behavior directly through androgen receptors. The study concluded that testosterone's actions on vascular cells were independent of aromatization to estradiol, with implications for understanding its role in vascular health and disease.