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  • Title: Vesicular transport in capillary endothelium: does it occur?
    Author: Bundgaard M.
    Journal: Fed Proc; 1983 May 15; 42(8):2425-30. PubMed ID: 6840292.
    Abstract:
    A revised picture of the organization of endothelial plasmalemmal vesicles is presented. Three-dimensional reconstructions of endothelial segments from frog mesenteric capillaries and rat heart capillaries based on ultrathin serial sectioning have shown that plasmalemmal vesicles are not true vesicles but parts of an elaborate system of invaginations of the surface membrane. The revised picture probably applies to capillary endothelia in general. The absence of free cytoplasmic vesicles implies that vesicular transport is unlikely to occur. A reinterpretation of previous studies of vesicular transport shows that they are equally compatible with the present view that plasmalemmal vesicles are static elements of invaginations of the endothelial surface membrane.
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