Endothelial Plasmalemmal Vesicles as Elements in a System of Branching Invaginations from the Cell Surface

In electron microscopy studies of the endothelial vesicles in frog mesenteric capillaries, an accidental observation was made concerning vesicular organization. When tannic acid was added to already fixed tissue, the mordant reached apparently free vesicles in the cytoplasm under conditions in which...

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Bibliographic Details
Published in:Proceedings of the National Academy of Sciences - PNAS 1979-12, Vol.76 (12), p.6439-6442
Main Authors: Bundgaard, Magnus, Frøkjaer-Jensen, J., Crone, Christian
Format: Article
Language:English
Subjects:
Animals
Anura
Biological markers
Biological Transport
Blood cells
Capillaries
Capillaries - metabolism
Capillaries - ultrastructure
Cell Membrane - ultrastructure
Cell membranes
Cytoplasm
Cytoplasmic Granules - ultrastructure
Electron microscopy
Endothelial cells
Endothelium
Endothelium - metabolism
Endothelium - ultrastructure
Ferritins
Intracellular Membranes - ultrastructure
Mesentery
Models, Structural
Rana temporaria
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Summary:In electron microscopy studies of the endothelial vesicles in frog mesenteric capillaries, an accidental observation was made concerning vesicular organization. When tannic acid was added to already fixed tissue, the mordant reached apparently free vesicles in the cytoplasm under conditions in which vesicular movement was excluded and in which the impermeability of the cell membranes was preserved. This indicates a spatial continuity between the vesicles and the cell exterior. It is proposed that cytoplasmic vesicles in endothelial cells are elements of branching, permanent or semipermanent invaginations of the plasmalemma.
ISSN:0027-8424
1091-6490
DOI:10.1073/pnas.76.12.6439