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Prostaglandin (PG) output from cultured placenta, sub-placenta, endometrium and fetal membranes of guinea-pigs was measured on days 22, 29 and 36 of pregnancy to establish the source of increased PGF 2α production during mid-pregnancy. PGF 2α and 6-keto-PGF 1α were produced in larger quantities than PGE 2 by the placenta, sub-placenta and endometrium;...
Pre-eclampsia and placenta accreta have opposite histological features of placentation. This study set out to test the hypotheses that the sex ratios in these two pregnancy complications are opposite and that these conditions are mutually exclusive. A population-based database covering all deliveries in South Australia between 1986 and 1995 and the hospital-based obstetric database of the Adelaide...
While endovascular trophoblast invasion of the human placental bed spiral arteries has been studied extensively, no information is available on the interaction between interstitially invading trophoblast and uterine capillaries and venules. Placental bed biopsies of eight normotensive and 15 pre-eclamptic patients were double-immunostained for cytokeratin and the endothelial marker CD31, providing...
Trophoblast invasion into the uterine wall is controlled by many factors. Previously, a human chorionic gonadotropin (hCG) receptor has been found to be expressed on invasive trophoblast as well as on choriocarcinoma cells implying a possible role for the hormone in trophoblast invasion. Therefore, this study examined the role of hCG in the invasion of trophoblastic (JEG-3) cells. Increasing hCG concentrations...
BeWo choriocarcinoma cells were cultured onto solid microcarrier beads, packed into syringe barrels and superfused. The unidirectional choline uptake across the microvillous membrane of the cells was measured by a rapid single-circulation paired-tracer dilution procedure using methyl[ 3 H]choline with d-[ 14 C]mannitol as the extracellular reference molecule. Choline influx was...
Molecular mechanisms controlling human trophoblast invasiveness are still poorly understood. In the present investigation, mRNA patterns of trophoblast cells isolated from first trimester (high invasiveness) and term placentae (no/low invasiveness) were compared by differential-display reverse transcriptase polymerase chain reaction (DDRT-PCR) revealing differential expression of numerous genes. Of...
This study assessed yolk sac morphology and vascularity and intervillous blood flow in normal early pregnancy and missed abortion. Transvaginal colour and pulsed Doppler were used in a prospective analysis of 87 normal pregnancies and 48 missed abortions between 6 and 12 weeks gestation. The Kruskal-Wallis rank test was used to calculate the difference in yolk sac diameter and vascularity visualization...
Pre-eclampsia is a hypertensive disorder of human pregnancy that is a leading cause of premature delivery and fetal growth retardation. It is characterized by hypertension, reduced uteroplacental blood flow, proteinuria and oedema. Pre-eclampsia is associated with increased lipid peroxidation in the maternal circulation and in the placenta. Mitochondria are sources of oxygen radicals and are enriched...
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