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Hormonal control of leydig cell differentiation

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Summary

The fine structure of the testicular interstitial cells of the 9-day-old mouse submitted to stimulation with human chorionic gonadotropin (HCG) is reported. As was previously described (Baillie 1964) the interstitial tissue of the prepubertal mouse testis is characterized by the presence of well differentiated epithelioid cells at a quiescent stage. They are characterized by large cytoplasmic depots of lipid droplets and glycogen particles in contrast to poorly developed membranous organelles. These cells are highly sensitive to the action of gonadotropins. Five daily injections of HCG cause their differentiation into cells with active secretory characteristics. The gonadotropin induces a marked depletion of the lipid droplets and glycogen content of the cytoplasm, concurrent with an unusual development of the membranes of the agranular endoplasmic reticulum. Golgi complexes and rough reticulum are prominent. Several changes also appear in the nucleus, especially in the nucleolus.

The correlation of the present electron microscopic study of the interstitial cells under HCG stimulation with previous biochemical and physiological findings tentatively suggests that the immature Leydig cells exhibit the basic organization necessary for biosynthesis of steroid hormones.

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  1. Agustin Aoki

    Present address: Electron Microscopy Section, Instituto de Ciencias Químicas, Universidad Nacional de Córdoba, Córdoba, Argentina

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    Aoki, A. Hormonal control of leydig cell differentiation. Protoplasma 71, 209–225 (1970). https://doi.org/10.1007/BF01279632

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