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Spatial memory performance in androgen insensitive male rats.

Bryan A Jones1, Neil V Watson

  • 1Hormones and Behaviour Laboratory, Department of Psychology, Simon Fraser University, Burnaby, BC, Canada V5A 1S6.

Physiology & Behavior
|June 1, 2005
PubMed
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Androgen receptor (AR) mechanisms contribute to brain masculinization, impacting spatial behavior and hippocampus development. This occurs independently of estrogenic processes, revealing a dual role for androgens in brain development.

Area of Science:

  • Neuroscience
  • Endocrinology
  • Developmental Biology

Background:

  • Brain masculinization in rodents is primarily attributed to aromatization of testosterone (T) to estradiol.
  • The specific role of androgen receptor (AR)-mediated mechanisms in brain masculinization remains incompletely understood.

Purpose of the Study:

  • To investigate the contribution of AR-mediated pathways to brain masculinization, independent of estrogenic effects.
  • To examine the impact of androgen insensitivity on spatial learning and hippocampal morphology in male rats.

Main Methods:

  • Comparison of tfm-mutant male rats (androgen-insensitive) with normal males and females using the Morris Water Maze.
  • Assessment of hippocampal morphology, specifically the granule cell layer of the dentate gyrus.

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Main Results:

  • Tfm-mutant males exhibited intermediate performance in the Morris Water Maze compared to normal males and females.
  • Tfm-mutant males showed faster acquisition of male-typical escape latencies than females.
  • The granule cell layer of the dentate gyrus was significantly larger in tfm-mutant males than in females.

Conclusions:

  • AR-mediated mechanisms contribute to the masculinization of spatial behaviors.
  • AR signaling influences hippocampal morphology, evidenced by increased dentate gyrus size in tfm-mutant males.
  • These AR-dependent effects on the brain appear to be independent of estrogenic processes.