Summary
The ultrastructure of vacuolar formation in the nucleus of the Sertoli cells in normal adult bulls is described. It occurs regularly in all the Sertoli cells instead of the typically arranged nucleolus. It consists of membrane-limited vesicles bearing 150 Å granules on their outer surface and a smaller, fibrillar component composed of coiled filaments 50 Å in diameter. Free and membrane attached ribosomes, and polyribosomes found in the numerous folds of the nuclear membrane indicate RNA synthesis. The possible role of the vacuolar formation, named multivesicular nuclear body, in the ribosomal RNA synthesis is briefly discussed.
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The author would like to express his gratitude to Professor P. Popesko and Doc. Dr. D. Hanzalová for the discussion and criticism regarding the manuscript, and to Mrs. I. Timčáková and Mrs. G. Gréserová for cooperation with the English translation. The author is also indebted to Doc. Ing. V. Karel, Technical University, Košice and Dr. A. Gutteková, Helminthological Institute of the Slovak Academy of Sciences, Košice, for their kindness in making available JEM 7c and Telsa BS 613 electron microscopes, respectively. The technical assistence of Ing. E. Tomajková is also acknowledged.
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Zibrín, M. Multivesicular nuclear body with nucleolar activity in sertoli cells of bulls. Z. Zellforsch. 135, 155–164 (1972). https://doi.org/10.1007/BF00315123
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DOI: https://doi.org/10.1007/BF00315123