Stereological study of white matter and myelinated nerve fibers in white matter of stress-resilient rats and stress-susceptible rats

Menglan HU; Jin WANG; Yanhong JIANG; Yanmin LUO; Yuan GAO; Qian XIAO; Jing TANG; Xin LIANG; Chunxia HUANG; Linmu CHEN; Yingqiang QI; Fenglei CHAO; Yong TANG; Hong WU

doi:10.16016/j.1000-5404.201710159

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Stereological study of white matter and myelinated nerve fibers in white matter of stress-resilient rats and stress-susceptible rats

更新时间：2026-03-02

- Stereological study of white matter and myelinated nerve fibers in white matter of stress-resilient rats and stress-susceptible rats
- Journal of Third Military Medical University Vol. 40, Issue 4, Pages: 316-321(2018)
- 作者机构：
  
  1..400016 重庆，重庆医科大学：组织学与胚胎学教研室Department of Histology and Embryology, the First Affiliated Hospital of Chongqing Medical University, Chongqing, 400016, China
  2..400016 重庆，重庆医科大学：附属第一医院老年病科Department of Physiology, College of Basic Medical Sciences, Chongqing Medical University, the First Affiliated Hospital of Chongqing Medical University, Chongqing, 400016, China
  3..400016 重庆，重庆医科大学：生理学教研室Department of Geriatrics, the First Affiliated Hospital of Chongqing Medical University, Chongqing, 400016, China
- 作者简介：
- 基金信息：
  
  the General Program of National Natural Science Foundation of China(81671259);the General Program of National Natural Science Foundation of China(81501156);the General Program of National Natural Science Foundation of China(81501101)
- DOI：10.16016/j.1000-5404.201710159
  CLC： R319;322.81;R749.2
- Received：23 October 2017，
  
  Published：28 February 2018
- 稿件说明：
移动端阅览
Menglan HU, Jin WANG, Yanhong JIANG, et al. Stereological study of white matter and myelinated nerve fibers in white matter of stress-resilient rats and stress-susceptible rats[J]. Journal of Third Military Medical University, 2018, 40(4): 316-321.
DOI：

Menglan HU, Jin WANG, Yanhong JIANG, et al. Stereological study of white matter and myelinated nerve fibers in white matter of stress-resilient rats and stress-susceptible rats[J]. Journal of Third Military Medical University, 2018, 40(4): 316-321. DOI： 10.16016/j.1000-5404.201710159.

摘要

目的

探讨在慢性不可预知性应激(chronic unpredictable stress，CUS)后压力耐受大鼠大脑白质体积及白质内有髓神经纤维总体积的改变，分析对压力的耐受能力是否与大脑白质的改变有关。

方法

选用50只4~5周龄雄性Sprague-Dawley(SD)大鼠，采用完全随机法分为空白对照组和模型组。模型组的大鼠在给予4周的CUS之后，根据糖水偏好实验(sucrose preference test

SPT)的结果筛选出压力易感组和压力耐受组。采用旷场实验(open field test

OFT)评估各组的行为学水平，运用体视学方法计算各组大鼠白质体积和白质内有髓神经纤维的体积。

结果

压力易感组的蔗糖偏好百分比显著低于空白对照组和压力耐受组(

0.01)。压力耐受组OFT总成绩显著优于空白对照组和压力易感组(

0.01)。压力耐受组的白质体积显著性高于压力易感组(

0.01)，但与空白对照组比较，差异没有统计

学意义(

0.05)。压力耐受组白质的有髓神经纤维总体积显著性高于压力易感组(

0.01)，与空白对照组相比差异没有统计学意义(

0.05)。

结论

白质和白质内有髓神经纤维的改变可能与抑郁易感性差异存在关系。

Abstract

Objective

To investigate the changes in the total volume of the white matter and the myelinated nerve fibers in the white matter of stress-resilient rats after chronic unpredictable stress (CUS) and explore whether resilience to stress is related to white matter changes.

Methods

Fifty 4-to 5-week-old male Sprague-Dawley rats were randomized into the control group and CUS group. The rats in CUS group were exposed to a 4-week CUS

and the stress-susceptible and stress-resilient rats were screened using sucrose preference test. The behavioral changes of the rats were assessed using open field test. In each rat

the white matter volume and the total volume of the myelinated nerve fibers in the white matter were investigated using stereological methods.

Results

The stress-susceptible rats showed significantly lowered sucrose preference compared with the control rats and stress-resilient rats (

0.01). The stress-resilient rats had significantly higher total scores in open field test than the control and stress-susceptible rats (

0.01). The white matter volume of the stress-resilient rats was significantly greater than that of the stress-susceptible rats (

0.01) and was similar to that in the control rats (

0.05). The total volume of the myelinated nerve fibers in the white matter of the stress-resilient rats was higher than that of the stress-susceptible rats (

0.01) but similar to that of the control rats (

0.05).

Conclusion

The changes in the white matter and the myelinated nerve fibers in the white matter might be associated with the differences in the susceptibility to depression.

关键词

Keywords

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