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1. 重庆医科大学基础医学院组织学与胚胎学教研室、干细胞与组织工程研究室,重庆,400016
2. 重庆医科大学基础医学院生理学教研室,重庆,400016
3. 重庆医科大学附属第一医院老年科,重庆,400016
纸质出版日期:2015,
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谭川雪, 王飞飞, 陈林木, 等. 抑郁症大鼠海马CA1区及齿状回毛细血管的体视学研究[J]. 重庆医科大学学报, 2015,40(5):649-655.
Tan Chuanxue, Wang Feifei, Chen Linmu, et al. Stereological study of capillaries in CA1 of hippocampus and dentate gyrus in depression model rats[J]. Journal of Chongqing Medical University, 2015,40(5):649-655.
目的:研究慢性不可预见性刺激(chronically unpredicted stress,CUS)所致抑郁症模型大鼠海马CA1区和齿状回(den-tate gyrus,DG)体积及毛细血管的改变。方法:选取Sprague Dawley(SD)大鼠,经筛选后随机分为对照组10只和模型组10只。模型组采取慢性不可预见刺激建立抑郁症模型,共给予应激35 d,对照组不给予应激。利用糖水偏好实验和开场实验检测模型是否建立成功。建模成功后,分别从模型组和对照组中各随机选取5只SD大鼠,运用体视学和免疫组化染色相结合的方法对大鼠海马CA1区和DG毛细血管进行定量研究,剩余5只进行相关分子生物学研究。结果:模型组大鼠和对照组大鼠在体质量[(314.81±31.52) g,(349.18±28.23) g,t=2.569,P=0.019]、糖水偏好实验[(82.37±8.44)%,(89.33±3.97)%,t=2.359,P=0.03]、开场实验结果[(48.30±39.49)分,(87.70±38.32)分,u=-1.988,P=0.047]具有统计学差异,模型组较对照组大鼠海马总体积[(88.84±7.51) mm3,(99.89±12.55) mm3,t=2.388,P=0.028]、海马CA1区[(27.78±1.84) mm3,(32.38±3.69) mm3,t=3.522,P=0.004]和DG[(21.02±2.61) mm3,(24.20±3.33) mm3,t=2.377,P=0.029]体积明显减少,模型组较对照组大鼠海马CA1区毛细血管总长度[(8.454±1.010) m,(11.012±1.642) m,t=2.967,P=0.018]、总体积[(0.104±0.019) mm3,(0.151±0.021) mm3,t=3.720,P=0.006]、总表面积[(1.025±0.113) cm2,(1.589±0.313) cm2,t=3.794,P=0.013]、平均直径[(3.884±0.458) μm,(4.580±0.419) μm,t=2.509,P=0.036]下降以及DG毛细血管的总体积[(0.078±0.021) mm3,(0.117±0.024) mm3,t=2.716,P=0.026]、总表面积[(0.838±0.184) cm2,(1.133±0.074) cm2,t=3.32,P=0.011]、平均直径[(3.611±0.493) μm,(4.630±0.635) μm,t=2.834,P=0.022]下降,结果具有统计学意义。结论:抑郁症模型大鼠大脑海马萎缩,CA1区、DG毛细血管改变,海马结构与毛细血管的改变可能参与了抑郁症的发病机制。
Objective:To investigate the changes of the capillaries in the CA1 of hippocampus and dentate gyrus(DG) in the depression rats induced by chronically unpredicted stress(CUS). Methods:Male Sprague-Dawley(SD) rats were randomly divided into the con-trol group(n=10) and the model group(n=10). The depression model was established by giving rats CUS for five weeks. The rats in control group did not receive CUS. The sucrose consumption test and open-field test were used to confirm whether the de-pression rat model was successfully made. After the depression model of rats was successfully made,5 rats were randomly se-lected from each group. The immunohistochemistrical technique and the stereological methods were used to quantitatively inves-tigate the capillaries in the CA1 of hippocampus and the DG. The other 5 rats in each group were used for the related molecular biol-ogy studies. Results:The rat weight[(314.81±31.52) g,(349.18±28.23) g,t=2.569,P=0.019],the results of the sugar water prefer-ence[(82.37±8.44)%,(89.33±3.97)%,t=2.359,P=0.03] and the results of the open-field test[(48.30±39.49),(87.70±38.32),u=-1.988,P=0.047] were significantly different between two groups. The volumes of the hippocampus[(88.84±7.51) mm3,(99.89±12.55) mm3,t=2.388,P=0.028],the CA1[(27.78±1.84) mm3,(32.38±3.69) mm3,t=3.522,P=0.004] and the DG[(21.02±2.61) mm3,(24.20±3.33) mm3,t=2.377,P=0.029] in model group were significantly lower than those in the control group. The total length[(8.454±1.010) m,(11.012±1.642) m,t=2.967,P=0.018],total volume[(0.104±0.019) mm3,(0.151±0.021) mm3,t=3.720,P=0.006],total surface area[(1.025±0.113) cm2,(1.589±0.313) cm2,t=3.794,P=0.013] and average diameter[(3.884±0.458) μm,(4.580±0.419) μm,t=2.509,P=0.036] of the capillaries in the hippocampal CA1 and the total volume[(0.078±0.021) mm,(0.117±0.024) mm,t=2.716,P=0.026],total surface area[(0.838±0.184),(1.133±0.074) cm2,t=3.32,P=0.011] and average diameter[(3.611±0.493) μm,(4.630±0.635) μm,t=2.834,P=0.022] of the capillaries in the DG were significantly decreased in model group than in control group. Conclusion:Hippocampal capillary changes can be observed in the CA1 and the DG in depression model rats,which might be involved in the pathogenesis of depression.
抑郁症海马CA1齿状回毛细血管体视学
depressioncapillaryCA1dentate gyrushippocampusstereology
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