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The 4-vessel Sampling Approach to Integrative Studies of Human Placental Physiology In Vivo
Published on: August 2, 2017
Development and hormonal functions of the human placenta
Jean Guibourdenche1, Thierry Fournier, André Malassiné
1INSERM, U767, 4 Avenue de l'Observatoire, 75006, Paris, France Université Paris Descartes, Paris, France PremUP Fondation, Paris, France Prenatal diagnosis, CHU Cochin-Saint Vincent de Paul, AP-HP.
Folia Histochemica Et Cytobiologica
|January 14, 2010
Summary
The human placenta
Area of Science:
- Reproductive Biology
- Endocrinology
- Developmental Biology
Background:
- The placenta is crucial for pregnancy, supporting fetal growth and maternal adaptation through hormonal functions.
- Human trophoblast differentiation occurs via villous and extravillous pathways, impacting placentation and spiral artery remodeling.
Purpose of the Study:
- To elucidate the differentiation pathways and hormonal functions of the human trophoblast.
- To understand the role of trophoblast in early pregnancy, including spiral artery remodeling and hormone secretion.
- To explore the regulation of trophoblast function by oxygen levels and its evolutionary significance.
Main Methods:
- Histological examination of placental development.
- Hormone assays to quantify placental secretions.
- Analysis of trophoblast differentiation markers.
- In vitro studies on trophoblast behavior under varying oxygen conditions.
Main Results:
- Extravillous trophoblast invades the uterus, remodeling spiral arteries and plugging them during early pregnancy.
- Trophoblast secretes hyperglycosylated hCG, essential for placentation quality.
- Syncytiotrophoblast, bathed in maternal blood after 10-12 weeks, secretes key hormones like placental GH and progesterone, influencing maternal metabolism and uterine quiescence.
- Estrogen synthesis by trophoblast relies on maternal and fetal androgens due to enzyme limitations.
Conclusions:
- Trophoblast differentiation and hormonal activity are vital for successful pregnancy.
- Oxygen tension significantly regulates trophoblast function, reflecting evolutionary adaptations in mammals.
- Placental hormone production directly impacts maternal physiology to support fetal development.
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