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Effects of hibernation on somatostatin-like immunoreactivity in the brain of the ground squirrel (Spermophilus richardsonii) and European hedgehog (Erinaceus europaeus)

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Summary

The localization of the somatostatin system in the brains of Richardson's ground squirrels (Spermophilus richardsonii) and European hedgehogs (Erinaceus europaeus) was described by use of immunocytochemical methods. In addition, (i) chemically differing types of somatostatin and (ii) different activity phases of the somatostatin system during the hibernation cycle were investigated in the ground squirrel by means of high pressure liquid chromatography (HPLC) and radioimmunoassay (RIA).

In both species, the hypothalamic component of the somatostatin system (periventricular nuclei, fiber projections to the median eminence) is more prominent than the widespread extrahypothalamic representation of the system displaying mainly scattered perikarya and nerve fibers. The reactivity pattern of the somatostatin system varied among hibernating, aroused, and non-hibernating animals; moreover, the interspecific differences were pronounced. The activity of the hypothalamic somatostatin system in the hibernating ground squirrel appeared to be suppressed when compared to non-hibernating controls, whereas in the hibernating hedgehog this system showed signs of increased activity in comparison to non-hibernating controls. In contrast, in the present material the extrahypothalamic components of the somatostatin system did not exhibit significant changes in their activity.

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Authors and Affiliations

  1. Department of Anatomy and Cytobiology, Justus Liebig University, Giessen, Germany

    F. Nürnberger

  2. Endocrine Research Group, University of Calgary, Calgary, Alberta, Canada

    K. Lederis & O. P. Rorstad

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  1. F. Nürnberger
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  2. K. Lederis
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  3. O. P. Rorstad
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Nürnberger, F., Lederis, K. & Rorstad, O.P. Effects of hibernation on somatostatin-like immunoreactivity in the brain of the ground squirrel (Spermophilus richardsonii) and European hedgehog (Erinaceus europaeus). Cell Tissue Res. 243, 263–271 (1986). https://doi.org/10.1007/BF00251040

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