Androgen receptor in mouse brain: sex differences and similarities in autoregulation

Endocrinology
S F LuN G Simon

Abstract

The androgen receptor (AR) is generally considered an autoregulated protein. However, studies in brain have produced mixed results regarding sex differences, which should be present given the higher endogenous levels of androgens in males, and the effects of gonadectomy, which presumably should lead to a loss of AR. Resolving these issues is a necessary step in developing a model of AR regulation in the central nervous system and, more broadly, in determining how regulation of this receptor may mediate neural target tissue responsiveness to androgen. To further investigate these issues, the distribution, density, and regulation of neural AR were compared among male and female mice that were intact, gonadectomized, or gonadectomized and given testosterone propionate (TP) through immunocytochemical and Western blot analyses. Four brain areas that have been linked to the regulation of male-typical behavior were evaluated: bed nucleus of the stria terminalis, posterior aspect, medial preoptic area, and dorsal and ventral aspects of the lateral septum. In the immunocytochemical study, integrated particle density, which reflects the average intensity of AR staining, was assessed among the six groups 24 h after surgery using PG-21, a ...Continue Reading

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