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Updated: Jul 14, 2026
An In Vivo Estrogen Deficiency Mouse Model for Screening Exogenous Estrogen Treatments of Cardiovascular Dysfunction After Menopause
Published on: August 13, 2019
Evaluation of hormone replacement therapy which may have an adrenomedullin-mediated protective effect on
Merih Bayram1, Orhan Bayram, M Yasemin Karadeniz Bilgili
1Department of Obstetrics and Gynecology, Faculty of Medicine, Kirikkale University, Kirikkale, Turkey. merbay@ttnet.net.tr
Background And Aims:
This study aimed to determine whether there is an adrenomedullin (AM)-mediated protective effect of postmenopausal estrogen/progestin therapy (HRT) against cardiovascular disorders.
Methods:
A total of 22 post-menopausal women without hysterectomy undergoing postmenopausal symptoms (aged 43-52) were treated with conjugated equine estrogen (0.625 mg/die) plus medroxyprogesterone acetate (2.5 mg/die) for six months. The flow velocity of the right middle cerebral artery [measured as resistance index (RI) and pulsatility index (PI)], plasma levels of adrenomedullin and endothelin- 1 (ET-1), mean baseline ratio of AM to ET-1, and lipid profiles were assessed before and after HRT.
Results:
A statistically significant difference was found for triglycerides, total cholesterol, AM/ET-1 ratio and right middle cerebral artery PI (p<0.05), without any significant differences in HDL, LDL, AM, ET-1, systolic blood pressure, diastolic blood pressure, a right middle cerebral artery RI (p>0.05) between pre- and post- HRT.
Conclusions:
Adrenomedullin may be added to other vasoactive peptides as a new potential candidate for HRT-mediated vascular protection. The ratio of AM/ET-1 vs AM or ET-1 alone may be a useful biological marker of this protection.
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