Summary
A systematic study of Δ5-3β-hydroxysteroid dehydrogenase in the granulosa cells of immature and mature mice was made. The histochemical results were compared with the ultrastructural findings on the same cells in an attempt to determine whether the granulosa cells are capable of a steroidogenic role.
In newborn and immature mice the granulosa cells of a great amount of follicles demonstrated a moderate or strong histochemical activity. In mature mice the granulosa cells demonstrated a weak or moderate activity normally only in preovulatory follicles and in some other atretic follicles. The granulosa cells of the normal developing follicles did not show such activity. In addition the histological control of numerous parallel sections demonstrated particularly in immature ovaries the presence of a great amount of atretic follicles.
In the cytoplasm of the granulosa cells of the follicles in immature ovaries only clusters of lipid droplets with ribosomes were noted; while in the preovulatory follicles of mature animals there started to appear mitochondria with tubular cristae, smooth membranes of the endoplasmic reticulum and irregular lipid droplets. In the obviously atretic follicles several granulosa cells as well as theca interna cells showed numerous lipid droplets and ribosomes together with different degenerating organelles. The granulosa cells of the normal developing follicles showed a well developed Golgi complex, granular endoplasmic reticulum and free ribosomes.
The histochemical and ultrastructural findings suggest a steroidogenic role of the granulosa cells only in the larger preovulatory follicles (probably related to an early luteinization of this layer) but this role was not demonstrated in the same cells in normal developing follicles.
In addition, since an histochemical positivity was demonstrated also in the granulosa cells of some obviously atretic follicles, it is possible that many of the follicles having granulosa cells filled with lipid droplets and attached ribosomes and histochemically positive might be, in the immature ovaries, in a very precocious stage of atresia.
It is to precise for these cells whether a cytoplasm with these two strictly correlated components (lipid droplets and attached ribosomes) and showing an histochemical positivity could carry-on all the biochemical steps involved in steroid biosynthesis or only has only a temporary capability to produce some precursors of steroids.
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The present results were partially presented to the “56ème Congrès de l'Association des Anatomistes” (Nantes, 4–8/4/1971) and to the “66° Verhandlungen der Anatomischen Gesellschaft” (Zagreb, 2/4/1971).
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Hadjioloff, A.I., Bourneva, V. & Motta, P. Histochemical demonstration of Δ5-3 ß-OHD activity in the granulosa cells of ovarian follicles of immature and mature mice correlated with some ultrastructural observations. Z.Zellforsch 136, 215–228 (1973). https://doi.org/10.1007/BF00307442
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DOI: https://doi.org/10.1007/BF00307442