The pancreatic islets of the teleost Scorpaena scropha |
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Authors: | Lennart Boquist Gregory Patent PhD |
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Institution: | (1) Institute of Pathology, University of Umeå, Umeå, Sweden;(2) Stazione Zoologica, Naples, Italy;(3) Department of Biology, East Carolina University, 27834 Greenville, North Carolina, USA |
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Abstract: | Summary The principal pancreatic islets of the teleost Scorpaena scropha are found ultrastructurally to contain four different kinds of parenchymal cells, viz.
1-(= D),
2-, -and agranular cells. The -cells show considerable variations in the shape of the secretory granules. A peculiar feature is that many of these granules are composed of fibrillar subunits, often in parallel arrangement. All -granules are surrounded by membranes and between the membrane and the granule core there is a moderately wide electron lucent space. The electron density of the cytoplasm in the -cells varies somewhat. The
2-cells possess typical secretory granules with an electron dense core and a closely applied membrane. The secretory granules in the
1-cells show also a closely applied membrane but a less dense core. Also in the -cells the electron opacity of the cytoplasm varies. The agranular cells are mainly characterized by low cytoplasmic electron density, narrow cisterns of endoplasmic reticulum and sometimes a laminated Golgi complex. Small immature secretory granules are occasionally seen in the cytoplasm of these cells. The significance of the fibrillar -granules remains obscure.This work was supported by grants from the Nordic Insulin Fund, the Town of Umeå, the Swedish Medical Research Council (Project No. B69-12X-718-04A), and by a postdoctoral fellowship from the United States Public Health Service. |
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Keywords: | Pancreatic islets Teleosts Scorpaena scropha Cell types Granules |
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