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Cellular localization of 3H-oestradiol in the hypothalamus

An autoradiographic study in male and female rats

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Summary

The hypothalamus of male and female rats, given 0.3 μg/100 g body weight of 6.7-3H-oestradiol-17β and killed 1 hour after the injection, was examined by autoradiography in order to 1) localize the areas and the cells involved in the uptake of the hormone, and 2) study the intracellular localization of the labelled material.

Only nerve cells contained radioactive material while glial and ependymal cells were not significantly labelled. In the anterior hypothalamus, labelled nerve cells were concentrated in areas corresponding to nucleus preopticus medialis and nucleus preopticus, pars suprachiasmatica. The nucleus supraopticus was unlabelled. In the medial basal hypothalamus, neurons corresponding to the nucleus arcuatus and the lateral part of the nucleus ventromedialis showed marked labelling. No significant labelling was observed in the nucleus paraventricularis, pars magnocellularis.

Although the individual nerve cells varied in their extent of labelling, the major proportion of the silver grains were consistently concentrated over the nuclei. Castration was not found to influence the results. The findings were essentially the same in male and female rats and appear to suggest that oestradiol exerts a direct effect on nerve cells in certain hypothalamic areas.

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  1. The University Institute of Pathological Anatomy, Rikshospitalet, Oslo 1, Norway

    Arne Attramadal

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  1. Arne Attramadal
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This work was supported by grants from the Norwegian Cancer Society, Nordisk Insulinfond and Anders Jahres Fond. The skilful assistance of Miss Helga Friedl and Mrs. Jane Larsen is gratefully acknowledged.

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Attramadal, A. Cellular localization of 3H-oestradiol in the hypothalamus. Z. Zellforsch. 104, 572–581 (1970). https://doi.org/10.1007/BF00335379

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