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The cell types in the endocrine pancreas of the human fetus

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Summary

Morphological and histochemical studies of the developing human islet cells are facilitated by the characteristic localization of the different islet cell types from about the third intrauterine month. By combining light microscopical analyses of silver impregnated and granule stained pancreatic sections with electron microscopy of osmium fixed material, the following four types of islet cells could be identified: (1) A1 cells containing faint globular granules. These granules could be visualized only with the electron microscope. (2) A2 cells containing electron-dense globular granules. It is uncertain whether the observation of a light and a dark variety of the A2 cells reflects different stages of maturation or signifies cells with different secretion products. (3) B cells with irregular granules, which were often accumulated at the capillary pole of the cells. (4) Agranular islet cells. Mixed forms of A cells containing both faint and dense granules were also encountered. The difficulties in evaluating in the light microscope what may be called D cells in the human fetal islets were obvious from the observation of more cells stained with light-green than A1 cells. Except for acid phosphatases, the histochemical tests for different phosphatases and esterases revealed rather weak or negative reactions in the islet cells. The development of phosphatase and esterase activities in the islets seemed far from complete, when morphologically differentiated islet cells could be recognized.

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Authors and Affiliations

  1. Department of Anatomy and Histology and Laboratory for Electron Microscopy, Royal Veterinary College, Stockholm, Sweden

    N. Björkman, C. Hellerström, B. Hellman & B. Petersson

  2. Departments of Histology, University of Uppsala and Karolinska Institutet, Stockholm, Sweden

    N. Björkman, C. Hellerström, B. Hellman & B. Petersson

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  1. N. Björkman
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  2. C. Hellerström
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  3. B. Hellman
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  4. B. Petersson
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Supported by the United States Public Health Service [grants RF-83(01) and TW-83(02)] and the Swedish Medical Research Council. The authors are indebted to Professor Carl Gemzell and Dr. Ulf Elvkull at the Department of Obstetrics and Gynecology, University Hospital, Uppsala, for the generous supply of the fetal pancreatic material.

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Björkman, N., Hellerström, C., Hellman, B. et al. The cell types in the endocrine pancreas of the human fetus. Zeitschrift für Zellforschung 72, 425–445 (1966). https://doi.org/10.1007/BF00319250

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