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Androgens are required for the development of male internal and external genitalia. Androgen action is mediated by an intracellular receptor which acts as a transcription factor following activation by ligand binding. The aim of the present study was to define the time of appearance of androgen receptor (AR) in the male fetal rat gonad using immunohistochemistry. Intact fetuses (days 13·5–16·5) or testicular tissue (days 16·5–20·5 and days 3–7 postnatal) were fixed in Bouins' solution and processed into paraffin wax. On day 16·5 nuclear AR were present in mesenchymal cells surrounding the Wolffian duct but those around the Mullerian duct were receptor negative. During the following day (17–18) the abundance of nuclear staining increased, becoming detectable in the epithelial cells of the Wolffian ducts. Within the testis some nuclear staining was apparent at day 17 but was confined to interstitial cells surrounding the seminiferous cords. As development of the testis proceeded the abundance of nuclear AR in peritubular and elongated mesenchymal cells increased. AR were not detected in fetal Leydig cells expressing 3β-hydroxysteroid dehydrogenase nor in the ovaries or associated ducts of female fetuses at the same ages.
In conclusion, in the rat we have found AR expression detectable by immunohistochemistry in mesonephric mesenchyme to be confined to that underlying the Wolffian ducts and to be absent from the area around the degenerating Mullerian duct. On and after day 17 of gestation AR is present in Wolffian duct epithelial cell nuclei and within the testis it is confined to peritubular and interstitial cells which may have migrated from the mesonephros. Fetal Leydig cells were receptor negative. Within the seminiferous cords AR in Sertoli cells remained low until after birth and some perinuclear staining was detected in cells thought to be gonocytes. We believe this to be the first report of immunolocalisation of AR to fetal testicular interstitial cells.
Journal of Endocrinology (1995) 147, 285–293
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