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Sex differences in the stress response in SD rats
Jing Lu1, Xue-Yan Wu1, Qiong-Bin Zhu1
1Department of Neurobiology; Key Laboratory of Medical Neurobiology of Ministry of Health of China; Zhejiang Province Key Laboratory of Mental Disorder's Management, Zhejiang Province Key Laboratory of Neurobiology, Zhejiang University School of Medicine, Hangzhou, China.
Behavioural Brain Research
|February 18, 2015
Summary
Stress impacts male and female rats differently, with females showing greater behavioral and neurobiological changes. These sex differences in stress response may offer insights into human depression.
Area of Science:
- Neurobiology
- Endocrinology
- Behavioral Science
Background:
- Sex differences are crucial in depression, often linked to exaggerated stress responses.
- Understanding neurobiological sex distinctions in stress is vital for depression research.
Purpose of the Study:
- To investigate sex-based neurobiological differences in acute and chronic stress responses in Sprague-Dawley rats.
- To compare behavioral, endocrine, and hypothalamic molecular changes between male and female rats under stress.
Main Methods:
- Rats were subjected to chronic unpredictable mild stress (CUMS) or acute foot shock (FS), with control groups.
- Plasma hormone levels (corticosterone, testosterone, estradiol) and hypothalamic mRNA expression of stress-related genes were analyzed.
- Behavioral changes and estrus cycle regulation were assessed in female rats.
Main Results:
- Chronic unpredictable mild stress (CUMS) disrupted female estrus cycles and induced more pronounced behavioral and hypothalamic alterations compared to males.
- Female rats exhibited decreased estradiol (E2) and testosterone (T) levels post-stress, while males showed varied hormonal responses (increased E2 in FS, decreased T in CUMS).
- A stronger corticosterone (CORT) response was observed in female rats under CUMS.
Conclusions:
- Stress elicits distinct behavioral, endocrine, and molecular responses in the hypothalamus between male and female rats.
- These findings highlight significant sexual dimorphism in stress system reactivity.
- The observed sex differences in rat stress response models human data related to stress and depression.
