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• W4224297606 abstract "Extracellular vesicles are now believed to be important mediators of placental-maternal communication. However, little is known about the formation of extracellular vesicles by human placenta. This study uses nanoscale three-dimensional imaging to investigate how and where placental extracellular vesicles form.Term and first trimester human placental villi were imaged by serial block face scanning electron microscopy. These images were analysed to quantify vesicle surface density. Segmentation was performed to reconstruct three-dimensional images of extracellular vesicles. Live imaging light microscopy of first trimester villous explants was performed.Vesicles were observed on the tips of placental microvilli in term and first trimester placenta. In term placenta these microvillous tip vesicles had a median size of 0.55 μm and their surface area density exceeded 22000 per mm2. Microvillous tip vesicle membranes had a lower electron density than the microvillous plasma membrane. Thirty seven percent of vesicles had a complex membrane structure including double membranes, internal vesicles and vesicle chains. Budding of smaller secondary vesicles from microvillous tip vesicle membranes was observed. Live imaging of a first trimester villus explant observed formation of vesicles which were larger but visually similar to the secondary vesicles observed by electron microscopy.These observations suggest that extracellular vesicles are forming on the tips of placental microvilli prior to release into maternal blood. However, it cannot be discounted that there are maternal extracellular vesicles that have bound to microvilli. In either case, the high surface area density of microvillous tip vesicles is consistent with an important role in placental-maternal signalling." @default.
• W4224297606 created "2022-04-26" @default.
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• W4224297606 date "2022-06-01" @default.
• W4224297606 modified "2023-10-17" @default.
• W4224297606 title "Microvillous tip vesicles may be an origin of placental extracellular vesicles" @default.
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• W4224297606 doi "https://doi.org/10.1016/j.placenta.2022.04.003" @default.
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