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Lamina propria of sex cords in human fetal testis: an immunohistological and stereological study

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Abstract

Testicular peritubular cells are located in the lamina propria of seminiferous tubules. These cells, significantly contributing to the basal membrane of seminiferous epithelium, have been studied in a number of species. However, there is a lack of data on the development of the lamina propria in the human testis. The aim of our survey was to investigate the characteristics of the lamina propria and, in particular, peritubular cells in the fetal human testes by immunohistological and stereological methods. Therefore, testes (14–39 weeks of gestation, n=45) were dissected and fixed in a 4% buffered paraformaldehyde solution. Several pieces of each testis were embedded in paraffin and processed for immunohistochemical and stereological analysis. All investigated testes have shown sex cords in the process of development and differentiation. Morphologically, peritubular cells in the lamina propria can be divided into two types: fibroblast-like (FL) and myoid-like (ML) type (cells which much resemble mature myoid cells). By immunohistochemistry, both FL and ML cells are found to be strongly positive for the intermediate filament desmin, but negative for α-smooth actin. While FL cells intensively express Ki-67 demonstrating proliferative activity, ML cells are found to be negative. The basement membrane of sex cords as well as the blood vessels of the interstitium show strong positivity to collagen IV and laminin. Concerning the correlation between the appearance of the investigated antigens with the gestational age, all antigens have been expressed (in the manner described above) already in the 14th week of gestation. The stereological analysis of the number (Nv) and volume (Vv) of peritubular cells indicates a pulsatile development of these cells in the lamina propria of the human fetal testis. While the stereological variables determined for FL cells show a gradual decrease, the same variables determined for ML cells demonstrate a successive increase. It appears that the lamina propria of the fetal human testes shares many of the properties previously discovered in rodents.

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Authors and Affiliations

  1. Institute of Histology and Embryology, Zagreb Medical School, Zagreb, Croatia

    Davor Jezek

  2. Institut für Pathologische Anatomie, Universität Innsbruck, Innsbruck, Austria

    Anton Hittmair & Hermann Rogatsch

  3. Department of Obstetrics and Gynecology, Zagreb Medical School, Zagreb, Croatia

    Marina Kos

  4. M. Radovana 24, HR-41000, Zagreb, Croatia

    Davor Jezek

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  1. Davor Jezek
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  2. Anton Hittmair
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  3. Hermann Rogatsch
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  4. Marina Kos
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Jezek, D., Hittmair, A., Rogatsch, H. et al. Lamina propria of sex cords in human fetal testis: an immunohistological and stereological study. Anat Embryol 193, 181–190 (1996). https://doi.org/10.1007/BF00214709

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