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Ultrastructure of the Gunn rat substantia nigra I. Cytoplasmic changes

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Summary

The substantia nigra of various aged hyperbilirubinemic (Gunn) rats was studied by means of electron microscopy. The cytological features observed in the neuronal somata were the presence of (1) complex membranous bodies (CMBs), (2) dilated cisternae of granular endoplasmic reticulum, (3) single membrane bound vacuoles and (4) enlarged mitochondria. Nearly every neuronal soma studied in two week old Gunn rats contained CMBs, which consisted of several layers of membrane that usually, but not always, surrounded small islands of cytoplasm. On occasion CMBs were seen to be directly connected with granular endoplasmic reticulum and, in a few instances, they were located within a cistern of endoplasmic reticulum. There were significantly fewer CMBs in the neuronal somata of adult Gunn rats. They were located peripherally in the somata or in the proximal portions of dendrites. Furthermore, in these animals the cytoplasm appeared normal and did not exhibit the features commonly seen in younger animals. Only a few hyperchromatic neurons were observed and no pronounced gliosis was evident. Therefore it is assumed that the majority of substantia nigra neurons recovered from the toxic effect of bilirubin or that the concentration of bilirubin deposited in the substantia nigra is not sufficient to be lethal. The hypothesis that is considered is that CMBs represent autophagic activity which results from exposure of neurons to bilirubin. The adjacent neurites and glia did not demonstrate the cytoplasmic changes that were characteristic of the neuronal somata.

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  1. Departments of Anatomy and Neurology, College of Medicine, University of Utah, 50 North Medical Drive, 84132, Salt Lake City, Utah, USA

    H. K. Batty & O. E. Millhouse

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  1. H. K. Batty
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  2. O. E. Millhouse
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Batty, H.K., Millhouse, O.E. Ultrastructure of the Gunn rat substantia nigra I. Cytoplasmic changes. Acta Neuropathol 35, 93–107 (1976). https://doi.org/10.1007/BF00690556

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