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Light and electron microscopic study on the endocrine cells of the pancreas in a marine teleost, Fugu rubripes rubripes

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Summary

The pancreatic endocrine tissue of Fugu rubripes rubripes consists of numerous round principal islets (Brockmann bodies) of various sizes scattered around the gall-bladder. The endocrine cells are divided into A-, B-, D-, and Ff-cells. Each cell type was identified by comparing thick and thin sections in both light and electron microscopy. Aldehyde-fuchsin positive B-cells contain numerous round secretory granules (average diameter 300 nm) each of which has a round compact core of moderate density; a narrow space exists between this core and the limiting membrane. Grimelius' silver positive A cells contain round secretory granules (average diameter 360 nm) with a hexagonal or tetragonal crystalline core (average diameter 170 nm) of high density; the silver grains preferentially appear in the space between the limiting membrane and the core. The crystalline core of each α-granule often contains an appendix-like structure of variable shape. D cells blackened by the silver impregnation method of Hellman and Hellerström (1960) have round secretory granules (average diameter 320 nm) filled with a flocculent material of low density. The fourth cell type (Ff-cell) has a clear cytoplasm after differential staining for light microscopy. By electron microscopy, this cell has elongated fusiform secretory granules (520 nm average length × 230 nm average width) filled with numerous filaments arranged in parallel with the longitudinal axis. Figures suggesting granule formation in the sacs of the Golgi apparatus were obtained in all of islet cell types. Equivalents of emiocytotic release of secretory granules were encountered in the A and Ff cells.

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  1. Department of Anatomy, Gunma University, School of Medicine, Maebashi, Japan

    Kan Kobayashi, Susumu Shibasaki & Yoshiyuki Takahashi

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  1. Kan Kobayashi
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Kobayashi, K., Shibasaki, S. & Takahashi, Y. Light and electron microscopic study on the endocrine cells of the pancreas in a marine teleost, Fugu rubripes rubripes . Cell Tissue Res. 174, 161–182 (1976). https://doi.org/10.1007/BF00222157

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