Key result
In female rats, chronic low-dose angiotensin II infusion decreased mean arterial pressure (-10 ± 2 mmHg), an effect abolished by ovariectomy (+4 ± 2 mmHg) and restored by estrogen replacement (-6 ± 2 mmHg).
Why the study?
Does estrogen replacement restore the depressor effects of chronic low-dose angiotensin II infusion in ovariectomized female rats?
Population
Female Sprague-Dawley rats undergoing ovariectomy or sham surgery
Comparison
17β-estradiol replacement and 2-week infusion of… vs Placebo and/or saline infusion
Design
Preclinical
Follow-up
2 weeks
Authors
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Supports estrogen-mediated offset of Ang II effects in female rats; leaves open translation to postmenopausal hypertension therapy.
Does estrogen replacement restore the depressor effects of chronic low-dose angiotensin II infusion in ovariectomized female rats?
Estrogen-dependent mechanisms offset the vasopressor actions of angiotensin II by enhancing RAS vasodilator pathways in female rats, highlighting potential therapeutic targets for women.
Sampson et al. (2011) studied Arterial pressure regulation. Chronic low-dose angiotensin II (ANG II) infusion and estrogen replacement vs. Saline / ovariectomy without estrogen replacement was evaluated on Mean arterial pressure (MAP). In female rats, chronic low-dose angiotensin II infusion decreased mean arterial pressure (-10 ± 2 mmHg), an effect abolished by ovariectomy (+4 ± 2 mmHg) and restored by estrogen replacement (-6 ± 2 mmHg).
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