Molecular Neurobiology

, Volume 40, Issue 2, pp 166–182 | Cite as

Chronic Stress- and Sex-Specific Neuromorphological and Functional Changes in Limbic Structures

  • Katie J. McLaughlin
  • Sarah E. Baran
  • Cheryl D. Conrad
Article

Abstract

Chronic stress produces sex-specific neuromorphological changes in a variety of brain regions, which likely contribute to the gender differences observed in stress-related illnesses and cognitive ability. Here, we review the literature investigating the relationship between chronic stress and sex differences on brain plasticity and function, with an emphasis on morphological changes in dendritic arborization and spines in the hippocampus, prefrontal cortex, and amygdala. These brain structures are highly interconnected and sensitive to stress and gonadal hormones, and influence a variety of cognitive abilities. Although much less work has been published using female subjects than with male subjects, the findings suggest that the relationship between brain morphology and function is very different between the sexes. After reviewing the literature, we present a model showing how chronic stress influences the morphology of these brain regions and changes the dynamic of how these limbic structures interact with each other to produce altered behavioral outcomes in spatial ability, behavioral flexibility/executive function, and emotional arousal.

Keyword

Stress Hippocampus Prefrontal cortex Amygdala Sex difference Spatial memory Emotional arousal Fear conditioning Behavioral flexibility Depression Post-traumatic stress disorder 

Abbreviations

AMY

Amygdala

CA

Cornu ammonis

GC

Glucocorticoid

HPA

Hypothalamic–pituitary–adrenal

MDD

Major depressive disorder

OVX

Ovariectomized

PFC

Prefrontal cortex

PTSD

Post-traumatic stress disorder

Notes

Acknowledgments

This study was supported by MH64727, a grant from the Institute for Mental Health Research, and the Arizona Biomedical Research Commission.

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Copyright information

© Humana Press Inc. 2009

Authors and Affiliations

  • Katie J. McLaughlin
    • 1
  • Sarah E. Baran
    • 2
  • Cheryl D. Conrad
    • 3
  1. 1.Department of PsychologyLoras CollegeDubuqueUSA
  2. 2.Department of PsychologyUniversity of MichiganAnn ArborUSA
  3. 3.Department of PsychologyArizona State UniversityTempeUSA

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