Abstract | AIM: We tested the hypothesis that estradiol (E2 ) reduces aortic oxidative stress and endothelial dysfunction in ovariectomized (OVX) female rats exposed to room air (RA) or chronic intermittent hypoxia (CIH). METHODS: RESULTS: After 7 or 35 days of CIH, E2 supplementation reduced arterial pressure. E2 reduced plasma endothelin-1 levels after 7 days of CIH, but not after 35 days. Ovariectomy, but not CIH for 7 days, increased aortic oxidative stress and E2 treatment prevented this effect. Remarkably, in animals exposed to RA, this was achieved by a reduction in NOX and XO activities, but in animals exposed to CIH this was achieved by increased catalase activity. In OVX female rats exposed to CIH for 7 days, E2 supplementation improved the NO-mediated vasodilation. After 35 days of CIH, enzymatic activities, AOPP and aortic reactivity were similar in all groups. CONCLUSION: E2 -based therapy could help prevent the vascular consequences of CIH in apneic women.
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Authors | Alexandra Ribon-Demars, Vincent Pialoux, Anaëlle Boreau, François Marcouiller, Richard Larivière, Aida Bairam, Vincent Joseph |
Journal | Acta physiologica (Oxford, England)
(Acta Physiol (Oxf))
Vol. 225
Issue 2
Pg. e13159
(02 2019)
ISSN: 1748-1716 [Electronic] England |
PMID | 29947475
(Publication Type: Journal Article, Research Support, Non-U.S. Gov't)
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Copyright | © 2018 Scandinavian Physiological Society. Published by John Wiley & Sons Ltd. |
Chemical References |
- Endothelin-1
- Estrogens
- Reactive Oxygen Species
- Estradiol
- Oxygen
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Topics |
- Animals
- Aorta
(enzymology)
- Arterial Pressure
(physiology)
- Endothelin-1
(blood)
- Endothelium, Vascular
(drug effects, physiopathology)
- Estradiol
(pharmacology)
- Estrogens
(pharmacology)
- Female
- Hypoxia
(blood, enzymology, physiopathology)
- Ovariectomy
- Oxidative Stress
(drug effects)
- Oxygen
(pharmacology)
- Rats
- Rats, Sprague-Dawley
- Reactive Oxygen Species
(metabolism)
- Vasodilation
(drug effects)
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