Summary
An electron microscopic study of the pulmonary lymphatic collecting channels and their valves in the rabbit revealed that the endothelial cells generally contain two centrioles which are almost invariably associated with one to several striated bundles of filaments. The structure of the centrioles corresponds well with that in other cell types. The filaments however were present only in endothelial cells and not in the perilymphatic connective tissue cells. The bundles consist of 2 to 6 filaments of about 40 Å diamenter and show a cross banding with a periodicity of 600 to 900 Å. They are attached at both ends or in the middle of the centriole. Their function is unknown, but they might be vestigial rootlets of rudimentary cilia of lymphatic endothelial cells.
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This study has been supported by a grant from “The Council for Tobacco Research—U.S.A.”. We thank R. Janssens for technical, G. Pison and St. Ons for photographic and R. Kell for secretarial assistance.
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Lauweryns, J.M., Boussauw, L. Centrioles and associated striated filamentous bundles in rabbit pulmonary lymphatic endothelial cells. Z.Zellforsch 131, 417–427 (1972). https://doi.org/10.1007/BF00582859
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DOI: https://doi.org/10.1007/BF00582859