Journal of Comparative Physiology B

, Volume 184, Issue 8, pp 1055–1063 | Cite as

Androgen receptor-mediated regulation of adrenocortical activity in the sand rat, Psammomys obesus

  • Abdelouafi Benmouloud
  • Zaina Amirat
  • Farida Khammar
  • Alexandre V. Patchev
  • Jean M. Exbrayat
  • Osborne F. X. Almeida
Original Paper

Abstract

The wild sand rat, Psammomys obesus, displays seasonal variations in adrenocortical activity that parallel those of testicular activity, indicating functional cross-talk between the hypothalamo-pituitary-adrenal and hypothalamo-pituitary–gonadal axes. In the present study, we examined androgen receptor (AR)-mediated actions of testicular steroids in the regulation of adrenocortical function in the sand rat. Specifically, we examined the expression of AR in the adrenal cortex, as well as adrenal apoptosis in male sand rats that had been surgically castrated or castrated and supplemented with testosterone; biochemical indices of adrenocortical function and hormone profiles were also measured. Orchiectomy was followed by an increase in adrenocorticotropic hormone secretion from the anterior pituitary and subsequently, increased adrenocortical activity; the latter was evidenced by orchiectomy-induced increases in the adrenal content of cholesterol and lipids as well as adrenal hypertrophy (seen as an elevation of the RNA/DNA ratio). Further, androgen deprivation respectively up- and downregulated the incidence of apoptosis within the glucocorticoid-producing zona fasciculata and sex steroid-producing zona reticularis. Interestingly, orchiectomy resulted in increased expression of AR in the zona fasciculata. All of the orchiectomy-induced cellular and biochemical responses were reversible after testosterone substitution therapy. Together, these data suggest that adrenocortical activity in the sand rat is seasonally modulated by testicular androgens that act through AR located in the adrenal cortex itself.

Keywords

Androgen receptor Adrenal cortex Testosterone Apoptosis Sand rat 

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Copyright information

© Springer-Verlag Berlin Heidelberg 2014

Authors and Affiliations

  • Abdelouafi Benmouloud
    • 1
  • Zaina Amirat
    • 1
  • Farida Khammar
    • 1
  • Alexandre V. Patchev
    • 2
  • Jean M. Exbrayat
    • 3
  • Osborne F. X. Almeida
    • 2
  1. 1.Laboratoire de recherche sur les zones arides, Faculté des Sciences BiologiquesUniversité des Sciences et de la Technologie Houari Boumediene (USTHB)AlgiersAlgeria
  2. 2.Max Planck Institute of PsychiatryMunichGermany
  3. 3.Université de Lyon, UMRS 449, Laboratoire de Biologie Générale, Université Catholique de Lyon, Reproduction et Dévelopment Comparé, EPHELyon Cedex 02France

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