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| Placenta | |
|---|---|
| Name | Placenta |
| Latin | placenta |
| Caption | Human placenta with umbilical cord |
| System | Reproductive system |
| Precursor | Chorionic villi |
| Artery | Umbilical arteries |
| Vein | Umbilical vein |
| Nerve | Autonomic nerves |
Placenta The placenta is a transient organ that forms during pregnancy to support embryonic and fetal development by mediating nutrient transfer, gas exchange, waste removal, endocrine signaling, and immunologic interaction between mother and conceptus. It arises from interactions between embryonic trophoblast and maternal decidua and shows marked variation across taxa, with extensive study in humans, mice, cows, and primates. Research into placental structure and function informs obstetrics, perinatal medicine, developmental biology, and evolutionary biology.
The gross anatomy includes fetal-derived chorionic plate, maternal-derived basal plate, intervillous space, and umbilical cord; histologically it contains chorionic villi composed of syncytiotrophoblast, cytotrophoblast, fetal capillaries, and stromal cells. Histologic descriptions reference cell types studied by pathologists at institutions like the Mayo Clinic, Johns Hopkins Hospital, and Karolinska Institutet; classic microscopic atlases by authors affiliated with Harvard Medical School and Oxford University detail villous tree branching and fibrinoid deposition. Pathways of trophoblast invasion have been mapped using techniques developed at Cold Spring Harbor Laboratory and Max Planck Institute for Molecular Cell Biology and Genetics.
Placental development begins with implantation following blastocyst attachment and trophoblast differentiation into cytotrophoblast and syncytiotrophoblast, influenced by signaling pathways characterized in work from Salk Institute and genetic models from The Jackson Laboratory. Uterine decidualization, modulated by progesterone signaling described by investigators at Imperial College London and University of California, San Francisco, creates the maternal environment for villous formation. Comparative embryology studies in models from Stanford University and University of Cambridge elucidate genes such as GATA, Hox, and Notch implicated in placentation, with molecular tools from EMBL and Broad Institute enabling lineage tracing.
The placenta performs gas exchange, nutrient transport (glucose, amino acids, lipids), hormone production (human chorionic gonadotropin, progesterone, estrogens), and barrier functions; these processes were quantified in clinical physiology studies at Massachusetts General Hospital and Cleveland Clinic. Endocrine output affects maternal systems studied by researchers at Columbia University and University of Pennsylvania, while metabolic profiling has been advanced by teams at European Molecular Biology Laboratory and Wellcome Trust Sanger Institute. Placental perfusion and hemodynamics have been modeled using techniques developed at MIT and ETH Zurich.
Maternal–fetal exchange depends on placental transporters and immunologic modulation allowing tolerance of a semi-allogeneic fetus; immunology findings from groups at National Institutes of Health and Pasteur Institute highlight roles for regulatory T cells, HLA-G expression, and cytokine networks. Studies linking maternal infections (investigated by Centers for Disease Control and Prevention and World Health Organization) to placental pathology show effects on transmission of pathogens like Zika and cytomegalovirus, with diagnostic assays developed at Roche and Abbott Laboratories. Placental immunology intersects with transplantation immunology research at Fred Hutchinson Cancer Center and computational immunology at Broad Institute.
Placental dysfunction underlies conditions such as preeclampsia, intrauterine growth restriction, placental abruption, and placenta accreta spectrum; clinical guidelines from American College of Obstetricians and Gynecologists and Royal College of Obstetricians and Gynaecologists guide management. Pathology criteria refined by panels at European Society of Pathology and outcome studies from World Health Organization inform risk stratification and interventions such as antihypertensive therapy studied in trials at Duke University and University of Oxford. Imaging advances with ultrasound technologies by GE Healthcare and MRI protocols from Mayo Clinic improve prenatal diagnosis, while perinatal epidemiology from Johns Hopkins Bloomberg School of Public Health links placental findings to long-term offspring health.
Placental forms range from epitheliochorial in ungulates (studied in research from Iowa State University and University of Edinburgh) to hemochorial in primates and rodents (investigated at Yale University and University of California, Davis); these differences reflect evolutionary adaptations examined by evolutionary biologists at University of Chicago and University of Michigan. Comparative genomics efforts at Wellcome Sanger Institute and National Human Genome Research Institute reveal convergent evolution and lineage-specific gene families associated with invasive placentation. Field studies integrating ecology and reproduction from Smithsonian Institution and Natural History Museum, London contextualize placental diversity across mammals, marsupials, and monotremes.
Current research spans single-cell transcriptomics, proteomics, and epigenomics of placental cells using platforms from 10x Genomics and computational methods from European Bioinformatics Institute. Noninvasive prenatal testing and cell-free DNA assays commercialized by Illumina and Natera exploit placental DNA release into maternal blood. Therapeutic strategies addressing placental insufficiency include targeted drug delivery, angiogenic modulators trialed at National Institutes of Health Clinical Center and cell-based therapies investigated at Karolinska Institutet and University of Cambridge. Ethical, regulatory, and public health frameworks for placental research are debated in forums at UNESCO and national regulatory agencies such as the Food and Drug Administration.
Category:Human reproductive system organs