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- W2891692857 abstract "All tissues are known to contain stem cells niches. The dental pulp stem cells (DPSCs) are highly proliferative and can differentiate to various cell types, including endothelial cells. We aimed to evaluate the ultrastructural characteristics of the human dental pulp niche corresponding to the frontal teeth. We found bona fide quiescent DPSCs with high nucleoplasmic ratios, as well as poorly differentiated cells with increased amount of cytoplasm, these later being indicated as dental pulp progenitor cells (DPPCs). Vasculogenic cords were built up by mitotic endothelial progenitor cells with a peculiar trait: giant nucleoli extruded within the cytoplasm. They were either partly embedded within the nuclei, case in which their adnuclear side was coated by marginal heterochromatin and the abnuclear side was coated by a thin rim of ribosomes, or were completely isolated from the nuclei, being covered by ribosomes and surrounded by cytoplasmic fragments of chromatin. To our knowledge such giant extruded nucleoli were not previously reported in any human stem niche or cell type, although similar evidence was gathered in other species as well as in plants. They relate perhaps to intermediate stages of differentiation within the dental niche, thus appearing as transient structures. Their role needs further investigations as it looks that not only nucleolar proteins are exported into the cytoplasm, but the entire nucleolus could be extruded." @default.
- W2891692857 created "2018-09-27" @default.
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- W2891692857 date "2018-09-11" @default.
- W2891692857 modified "2023-10-16" @default.
- W2891692857 title "Extruded Nucleoli in Poorly Differentiated Dental Pulp Cells of Human Frontal Teeth" @default.
- W2891692857 doi "https://doi.org/10.20944/preprints201809.0189.v1" @default.
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