17β-Estradiol prevents oxidative stress and decreases blood pressure in ovariectomized rats

I Hernández, JL Delgado, J Díaz… - American Journal …, 2000 - journals.physiology.org
I Hernández, JL Delgado, J Díaz, T Quesada, MJG Teruel, MC Llanos, LF Carbonell
American Journal of Physiology-Regulatory, Integrative and …, 2000journals.physiology.org
In this study, we tested whether estrogen deficiency is associated with oxidative stress and
decreased nitric oxide (NO) production, which could be responsible for an increased blood
pressure in ovariectomized rats. Hemodynamic studies were performed on conscious,
chronically instrumented rats. Chronic estrogen replacement on ovariectomized rats lowered
blood pressure∼ 13 mmHg, from 119±3 mmHg in ovariectomized rats to 106±3 mmHg in
ovariectomized-treated rats; it was also accompanied by an increase in cardiac index and …
In this study, we tested whether estrogen deficiency is associated with oxidative stress and decreased nitric oxide (NO) production, which could be responsible for an increased blood pressure in ovariectomized rats. Hemodynamic studies were performed on conscious, chronically instrumented rats. Chronic estrogen replacement on ovariectomized rats lowered blood pressure ∼13 mmHg, from 119 ± 3 mmHg in ovariectomized rats to 106 ± 3 mmHg in ovariectomized-treated rats; it was also accompanied by an increase in cardiac index and vascular conductance, achieving hemodynamic values similar to those shown by sham-operated rats.N G-nitro-l-arginine methyl ester administration lowered significantly less the vascular conductance (0.14 ± 0.01 vs. 0.22 ± 0.03 and 0.26 ± 0.01 ml · min−1 · mmHg−1/100 g;P < 0.05) in ovariectomized rats than in the sham-operated and estrogen-treated ovariectomized rats, respectively. Estrogen replacement prevented the lower plasma levels of nitrites/nitrates observed in ovariectomized rats. The lower plasma total antioxidant status and reduced thiol groups and the increase in plasma lipoperoxides presented in ovariectomized animals were reestablished with the estrogen treatment. These results show that estrogen administration decreases blood pressure and increases vascular conductance in ovariectomized rats. This effect may be related to an increase in NO synthesis and/or preventing oxidative stress, then improving endothelial function.
American Physiological Society
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