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Pericytes on placental capillaries in terminal villi preferentially cover endothelial junctions in regions furthest away from the trophoblast.
Harris, Shelley E; Matthews, Kate Sh; Palaiologou, Eleni; Tashev, Stanimir A; Lofthouse, Emma M; Pearson-Farr, Jennifer; Goggin, Patricia; Chatelet, David S; Johnston, David A; Jongen, Maaike Sa; Page, Anton M; Cleal, Jane K; Lewis, Rohan M.
Afiliación
  • Harris SE; Human Development and Health, Faculty of Medicine, University of Southampton, UK.
  • Matthews KS; Human Development and Health, Faculty of Medicine, University of Southampton, UK.
  • Palaiologou E; Human Development and Health, Faculty of Medicine, University of Southampton, UK.
  • Tashev SA; Biomedical Imaging Unit, Faculty of Medicine, University of Southampton, UK.
  • Lofthouse EM; Human Development and Health, Faculty of Medicine, University of Southampton, UK.
  • Pearson-Farr J; Human Development and Health, Faculty of Medicine, University of Southampton, UK.
  • Goggin P; Biomedical Imaging Unit, Faculty of Medicine, University of Southampton, UK.
  • Chatelet DS; Biomedical Imaging Unit, Faculty of Medicine, University of Southampton, UK.
  • Johnston DA; Biomedical Imaging Unit, Faculty of Medicine, University of Southampton, UK.
  • Jongen MS; Human Development and Health, Faculty of Medicine, University of Southampton, UK.
  • Page AM; Biomedical Imaging Unit, Faculty of Medicine, University of Southampton, UK.
  • Cleal JK; Human Development and Health, Faculty of Medicine, University of Southampton, UK; Institute for Life Sciences, University of Southampton, UK.
  • Lewis RM; Human Development and Health, Faculty of Medicine, University of Southampton, UK; Institute for Life Sciences, University of Southampton, UK. Electronic address: rohan.lewis@soton.ac.uk.
Placenta ; 104: 1-7, 2021 01 15.
Article en En | MEDLINE | ID: mdl-33190063
INTRODUCTION: Pericytes are a common feature in the placental microvasculature but their roles are not well understood. Pericytes may provide physical or endocrine support for endothelium and in some tissues mediate vasoconstriction. METHODS: This study uses serial block-face scanning electron microscopy (SBFSEM) to generate three-dimensional (3D) reconstructions of placental pericytes of the terminal villi and transmission electron microscopy (TEM) to study pericyte endothelial cell interactions. The proportion of endothelial cell junctions covered by pericytes was determined. RESULTS: The detailed 3D models of placental pericytes show pericyte structure at a new level of detail. Placental pericytes have many fingers extending from the cell body which can span multiple capillary branches. The proportion of endothelial cell-cell junctions covered by pericytes was significantly higher than pericyte coverage of capillary endothelium as a whole (endothelium: 14%, junctions: 43%, p < 0.0001). However, the proportion of endothelial cell-cell junctions covered by pericytes in regions adjacent to trophoblast was reduced compared to regions >3 µm away from trophoblast (27% vs 62% respectively, p < 0.001). No junctional complexes were observed connecting pericytes and endothelial cells but there were regions of cell membrane with features suggestive of intercellular adhesions. DISCUSSION: These data suggest that the localisation of pericytes on the villous capillary is not random but organised in relation to both endothelial junctions and the location of adjacent trophoblast. This further suggests that pericyte coverage may favour capillary permeability in regions that are most important for exchange, but limit capillary permeability in other regions.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Placenta / Trofoblastos / Capilares / Vellosidades Coriónicas / Pericitos Límite: Female / Humans / Pregnancy Idioma: En Revista: Placenta Año: 2021 Tipo del documento: Article Pais de publicación: Países Bajos
Texto completo
Añadir a Mi BVS
Imprimir
XML
PubMed Links
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Placenta / Trofoblastos / Capilares / Vellosidades Coriónicas / Pericitos Límite: Female / Humans / Pregnancy Idioma: En Revista: Placenta Año: 2021 Tipo del documento: Article Pais de publicación: Países Bajos