Effects of chronic inhibition of Testosterone metabolism on cardiac remodeling after ischemia/reperfusion-induced myocardial damage in gonadectomized rats

Abstract

The effects of testosterone on cardiovascular homeostasis are still not well understood. The objective of this work was to evaluate the effects of testosterone in the absence or presence of inhibition of Aromatase (4-hydroxyandrostenedione) and/or 5α reductase (Finasteride) enzymatic activities on the myocardial remodeling 30 days after ischemia/reperfusion (I/R) injury in gonadectomized rats. Results showed that testosterone administration to ORX rats resulted in decreased myocardial damaged area, inflammatory infiltrates and reduced MMP-3 and 13 expressions. Interestingly, Finasteride administration resulted in a greater decrease in scar tissue, inflammatory infiltrates, along with a significant decrease in MMP-3 and 13 expressions. In contrast, 4-hydroxyandrostenedione administrations increased all parameters. Our results suggest that testosterone does not have a direct effect since simultaneous inhibition of aromatase and 5α-reductase did not induce significant changes in I/R induced myocardial injury.

(Sex differences in cardiac tolerance to ischemia-reperfusion injury - the role of mitochondria)

“…zjištěno, že podání testosteronu ovariektomizovaným samicím zmenšilo rozsah ischemického poškození. 74 Nedávno Ghimire a spol. ukázali, že nízké dávky testosteronu mají protektivní vliv proti I/R poškození.…”