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Updated: Aug 14, 2025
Isolation of Sertoli Cells and Peritubular Cells from Rat Testes
Published on: February 8, 2016
Macrophages in juvenile pig testis: Link with increase in Sertoli cells induced by oestradiol suppression
1Department of Animal Science, University of California, Davis, Davis, California, USA.
Abstract:
Macrophage presence and location were evaluated in juvenile boar testes at the end of the first wave of Sertoli cell proliferation. Macrophage presence was compared in littermate boars treated with letrozole, a treatment which extended this first wave of proliferation beyond the sampling timepoint. Macrophages were identified as the CD68 positive cells following immunohistochemical labelling of paraffin sections and parenchymal macrophages enumerated. Macrophages present in a layer beneath the tunica albuginea received a score based on density and thickness of this layer. Density within the testicular parenchyma was highly variable in vehicle-treated boars (>100-fold) and did not differ from that observed in the letrozole-treated littermates. However, the macrophage layer beneath the tunica albuginea was denser and thicker in the letrozole-treated animals than in their vehicle-treated littermates. This suggests that macrophages might be involved in the letrozole-induced prolongation of Sertoli cell proliferation.
Insights
Letrozole treatment in juvenile boars extended Sertoli cell proliferation. This treatment increased the density and thickness of macrophages beneath the tunica albuginea, suggesting their role in prolonged Sertoli cell proliferation.
Area of Science:
- Reproductive biology
- Immunology
- Developmental biology
Background:
- Sertoli cell proliferation is crucial for testicular development.
- Macrophages play roles in tissue remodeling and immune surveillance.
- Understanding the cellular dynamics during testicular development is essential.
Purpose of the Study:
- To investigate the presence and location of macrophages in juvenile boar testes.
- To compare macrophage distribution in boars treated with letrozole, which extends Sertoli cell proliferation, versus controls.
- To explore the potential role of macrophages in letrozole-induced changes in Sertoli cell proliferation.
Main Methods:
- Immunohistochemical labeling using CD68 to identify macrophages in paraffin-embedded testicular sections.
- Enumeration of parenchymal macrophages.
- Scoring the density and thickness of the macrophage layer beneath the tunica albuginea.
Main Results:
- Macrophage density within the testicular parenchyma was highly variable and did not differ between letrozole-treated and vehicle-treated boars.
- A significantly denser and thicker layer of macrophages beneath the tunica albuginea was observed in letrozole-treated boars compared to controls.
- Parenchymal macrophage density showed over 100-fold variation in vehicle-treated boars.
Conclusions:
- Letrozole treatment leads to an accumulation of macrophages in the layer beneath the tunica albuginea in juvenile boar testes.
- These findings suggest that macrophages may be involved in the letrozole-induced prolongation of the first wave of Sertoli cell proliferation.
- Further research is warranted to elucidate the specific mechanisms by which macrophages influence Sertoli cell proliferation during testicular development.
