Abstract
Human mast cells are professional secretory cells that store synthetic products in large granules filling their cytoplasm. Unlike many secretory cells, the principal synthetic organelle, ribosome-rich endoplasmic reticulum, is a minor component of their cytoplasm. Sightings of nonmembrane-bound ribosomes in and near their secretory granules stimulated detailed ultrastructural studies of various RNA species to implicate secretory-storage granules in RNA biology. In the work reported here, postembedding immunogold ultrastructural cytochemistry indicates that human mast cells contain uridine, an integral ingredient of RNA, and ribonucleoproteins, known to associate with small nuclear RNAs important for splicing RNA precursors, several ribonucleoproteins with possible functions in other aspects of RNA biology and ribonucleoproteins known to associate with ribosomes. These findings should catalyse future work toward establishing the full functional repertoire of secretory-storage granules.
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Dvorak, A.M., Morgan, E.S. Ultrastructural Immunogold Cytochemistry with Autoimmune Human Sera and an Antibody to Uridine Implicate Human Mast Cell Granules in RNA Biology. Histochem J 32, 685–696 (2000). https://doi.org/10.1023/A:1004119500801
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DOI: https://doi.org/10.1023/A:1004119500801