17β-Estradiol prevents oxidative stress and decreases blood pressure in ovariectomized rats
| Autor: | Luis F. Carbonell, Tomás Quesada, M. José G. Teruel, M. Carmen Llanos, Juan L. Delgado, J. Diaz, Isabel Hernández |
|---|---|
| Rok vydání: | 2000 |
| Předmět: |
Lipid Peroxides
medicine.medical_specialty Endothelium Physiology medicine.drug_class Ovariectomy Hemodynamics Blood Pressure Nitric Oxide medicine.disease_cause Nitroarginine Nitric oxide Rats Sprague-Dawley chemistry.chemical_compound Physiology (medical) Internal medicine medicine Animals Cardiac Output Enzyme Inhibitors Estradiol Body Weight Rats Oxidative Stress Blood pressure medicine.anatomical_structure Endocrinology chemistry Estrogen Ovariectomized rat Female Nitric Oxide Synthase Oxidative stress Blood vessel |
| Zdroj: | American Journal of Physiology-Regulatory, Integrative and Comparative Physiology. 279:R1599-R1605 |
| ISSN: | 1522-1490 0363-6119 |
| DOI: | 10.1152/ajpregu.2000.279.5.r1599 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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