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Ultrastructural changes in Paneth cells during hibernation in the ground squirrel Spermophilm lateralis

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Summary

The ultrastructure of Paneth cells from jejuno-ileal segments of the small intestine of the ground squirrel, S. lateralis, was examined under normal euthermic conditions and during the profoundly depressed metabolic conditions of natural hibernation. Paneth cells obtained from hibernating animals gave evidence of markedly reduced activity when compared to Paneth cells from euthermic animals. In hibernating animals, the nuclei were smaller, with less prominent nucleoli and with an increased proportion of heterochromatin. In hibernating animals, the rough endoplasmic reticulum was fragmentary and poorly organized, in contrast to the typical arrangement of concentric lamellae seen in euthermic animals. Although the total number of ribosomes was decreased in hibernating animals, there were proportionally more free ribosomes than in euthermic animals. Paneth cells from hibernating animals also contained a greater number of apical secretory granules which were smaller and more variable in electron density than granules from control animals. These ultrastructural features indicate that during hibernation the Paneth cell is relatively quiescent.

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Authors and Affiliations

  1. Department of Anatomical Sciences, College of Medicine, The University of Oklahoma Health Sciences Center, Oklahoma City, Oklahoma, USA

    Delphi M. Toth

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  1. Delphi M. Toth
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Supported by U.S.P.H.S. grants RR 05411 and RR 05583 from the N.I.H.

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Toth, D.M. Ultrastructural changes in Paneth cells during hibernation in the ground squirrel Spermophilm lateralis . Cell Tissue Res. 211, 293–301 (1980). https://doi.org/10.1007/BF00236450

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