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Related Experiment Videos

Estrogen mediates sex differences in stress-induced prefrontal cortex dysfunction.

R M Shansky1, C Glavis-Bloom, D Lerman

  • 1Department of Neurobiology, Yale University School of Medicine, New Haven, CT 06520-8001, USA. rebecca.shansky@yale.edu

Molecular Psychiatry
|October 22, 2003
PubMed
Summary
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Estrogen amplifies stress effects on the prefrontal cortex (PFC), potentially explaining why women experience higher rates of anxiety and major depressive disorder (MDD). This study highlights sex differences in stress-induced PFC dysfunction.

Area of Science:

  • Neurobiology
  • Psychiatry
  • Endocrinology

Background:

  • Anxiety disorders and major depressive disorder (MDD) are twice as common in women as men.
  • The neurobiological underpinnings of this sex disparity are not well understood.
  • Prefrontal cortex (PFC) dysfunction is linked to MDD and stress exposure.

Purpose of the Study:

  • To investigate sex differences in stress-induced PFC dysfunction.
  • To examine the role of estrogen in stress sensitivity within the PFC.

Main Methods:

  • Male and female rats were tested on a PFC-dependent working memory task.
  • FG7142, a stress-activating agent, was administered.
  • Experiments included different phases of the female rat estrous cycle and ovariectomized females with estrogen replacement.

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Main Results:

  • Female rats showed impaired working memory at lower FG7142 doses than males during proestrus (high estrogen).
  • No significant sex difference in impairment was observed during estrus (low estrogen).
  • Ovariectomized females only exhibited heightened stress sensitivity after estrogen replacement.

Conclusions:

  • Estrogen appears to enhance stress-induced PFC dysfunction.
  • This estrogen-mediated effect may contribute to the higher prevalence of stress-related disorders in women.
  • Findings suggest a neurobiological basis for sex differences in susceptibility to MDD and anxiety.