Summary
The subject of this study is the ultrastructural alterations of the taste-bud cells of the foliate papilla of the rabbit after sectioning of the homolateral glossopharyngeal nerve. In the course of the experiment two different, and successive, degenerative patterns were observed: the first involves type I sensory cells and the development therein of numerous dense inclusion bodies with a marked polymorphism similar to the classic lysosomes in various stages of development. Some assume the character of autophagic vacuoles or cytosegregosomes with cytoplasmic organelles more or less altered. They prefer slightly differentiated cells and, in particular, a type of cell characterized by a clear cytoplasmic matrix and a scarsity of the organelles.
The other degenerative pattern, which appertains to the type II cells, overwhelms the entire cytoplasmic organization and rapidly causes the destruction of the cell.
These observations are discussed in relationship to:
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1.
the evaluation of the autophagic function of the lysosomes and in particular the cytosegregosomes;
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2.
the theory of the trophic function of nerves, in general, and sensory nerves, in particular.
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The author wishes to thank Professor N. Miani for his valuable criticism. The technical assistance of Mr. M. Di Iorio and the photographic help of Mr. V. Panetta are gratefully acknowledged.
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Olivieri-Sangiacomo, C. Ultrastructural modifications of denervated taste buds. Z. Zellforsch. 108, 397–414 (1970). https://doi.org/10.1007/BF00336527
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DOI: https://doi.org/10.1007/BF00336527