Suppression of trophoblast uterine spiral artery remodeling by estrogen during baboon pregnancy: impact on uterine and fetal blood flow dynamics

The present study was conducted to determine the impact of suppressing trophoblast remodeling of the uterine spiral arteries by prematurely elevating estrogen levels in the first trimester of baboon pregnancy on uterine and umbilical blood flow dynamics. Uteroplacental blood flow was assessed by Dop...

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Bibliographic Details
Published in:American journal of physiology. Heart and circulatory physiology 2012-05, Vol.302 (10), p.H1936-H1944
Main Authors: Aberdeen, Graham W, Bonagura, Thomas W, Harman, Chris R, Pepe, Gerald J, Albrecht, Eugene D
Format: Article
Language:English
Subjects:
Animal reproduction
Animals
Blood
Blood Pressure - drug effects
Blood Pressure - physiology
Cellular biology
Estradiol - blood
Estrogens
Estrogens - pharmacology
Female
Fetus - blood supply
Heart Rate - drug effects
Heart Rate - physiology
Homeostasis - drug effects
Homeostasis - physiology
Models, Animal
Monkeys & apes
Papio - physiology
Pregnancy
Pregnancy, Animal - physiology
Regional Blood Flow - drug effects
Regional Blood Flow - physiology
Serotonin
Serotonin - pharmacology
Serotonin Receptor Agonists - pharmacology
Trophoblasts - drug effects
Trophoblasts - physiology
Umbilical Arteries - physiology
Uterine Artery - drug effects
Uterine Artery - physiology
Vascular Biology and Microcirculation
Veins & arteries
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Summary:The present study was conducted to determine the impact of suppressing trophoblast remodeling of the uterine spiral arteries by prematurely elevating estrogen levels in the first trimester of baboon pregnancy on uterine and umbilical blood flow dynamics. Uteroplacental blood flow was assessed by Doppler ultrasonography after acute administration of saline (basal state) and serotonin on days 60, 100, and 160 of gestation (term: 184 days) to baboons in which uterine spiral artery remodeling had been suppressed by the administration of estradiol on days 25-59 of gestation. Maternal blood pressure in the basal state was increased (P < 0.01), and uterine artery diastolic notching and the umbilical artery pulsatility index and systolic-to-diastolic ratio, reflecting downstream flow impedance, were increased (P < 0.01) after serotonin administration on day 160, but not earlier, in baboons treated with estradiol in early gestation. These changes in uteroplacental flow dynamics in serotonin-infused, estradiol-treated animals were accompanied by a decrease (P < 0.05) in uterine and umbilical artery volume flow and fetal bradycardia. The results of this study show that suppression of uterine artery remodeling by advancing the rise in estrogen from the second trimester to the first trimester disrupted uteroplacental blood flow dynamics and fetal homeostasis after vasochallenge late in primate pregnancy.
ISSN:0363-6135
1522-1539
DOI:10.1152/ajpheart.00590.2011