Abstract
The reprograming effects of prenatal testosterone (T) treatment on postnatal reproductive parameters have been studied extensively in females of several species but similar studies in males are limited. We recently found that prenatal T treatment increases Sertoli cell number and reduced spermatogenesis in adult rams. If such disruptions are manifested early in life and involve changes in testicular paracrine environment remain to be explored. This study addresses the impact of prenatal T excess on testicular parameters in infant males, including Sertoli cell number and expression of critical genes [FSH receptor (FSHR), androgen receptor (AR), transforming growth factor beta 1 (TGFB1), 3 (TGFB3), transforming growth factor beta type 1 receptor, (TGFBR1), and anti-Müllerian hormone (AMH)] modulating testicular function. At 4 week of age, male lambs born to dams treated with 30 mg of T propionate twice weekly from day 30 to 90, followed by 40 mg of T propionate from day 90 to 120 of pregnancy (T-males), had a higher number of Sertoli cells/testis (P = 0.035) than control males (C-males) born to dams treated with the vehicle. While no differences were observed in the expression of FSHR and TGFB3, testicular TGFBR1 expression was found to be lower in T-males (P = 0.03) compared to C-males. Expression level of AMH, TGFB1, and AR also tended to be lower in T-males. These findings provide evidence that impact of fetal exposure to T excess is evident early in postnatal life, mainly characterized by an increase in Sertoli cell number. This could explain the testicular dysfunction observed in adult rams.
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Acknowledgments
We are grateful to Dr. José F. Cox for the facilities of the Reproductive Biotechnology Laboratory of the Universidad de Concepción; to Dr Gordon E Niswender, Leo Reichert Jr and A. F. Parlow for providing reagents for LH and FSH RIAs, to DAAD (Deutscher Akademischer Austauschdienst) for the donation of the Biophotometer. Participation of Dr Vasantha Padmanabhan and Dr Rodolfo Rey in this project was supported by International Collaboration Agreement with FONDECYT. This work was supported by Fondecyt Grant 1090031. This work was supported by the National Fund for Science and Technology Development (FONDECYT, Grant number 1090031).
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The authors declare that there is no conflict of interest that could be perceived as prejudicing the impartiality of the research reported.
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Rojas-García, P.P., Recabarren, M.P., Sir-Petermann, T. et al. Altered testicular development as a consequence of increase number of sertoli cell in male lambs exposed prenatally to excess testosterone. Endocrine 43, 705–713 (2013). https://doi.org/10.1007/s12020-012-9818-5
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DOI: https://doi.org/10.1007/s12020-012-9818-5