Running exercise improves astrocyte loss, morphological complexity and astrocyte-contacted synapses in the hippocampus of CUS-induced depression model mice

星形胶质细胞 行为绝望测验 海马体 树突棘 神经科学 海马结构 突触 尾部悬挂试验 突触蛋白I 生物 抗抑郁药 中枢神经系统 突触小泡 生物化学 小泡
作者
Yue Li,Yang Luo,Pingting Zhu,Xin Liang,Jing Li,Xiaoyun Dou,Li Liu,Qin Lu,Mei Zhou,Yuhui Deng,Lin Jiang,Shun Wang,Wenyu Yang,Jing Tang,Yong Tang
出处
期刊:Pharmacology, Biochemistry and Behavior [Elsevier]
卷期号:239: 173750-173750
标识
DOI:10.1016/j.pbb.2024.173750
摘要

Although the antidepressant effects of running exercise have been widely reported, further research is still needed to determine the structural bases for these effects. Astrocyte processes physically contact many synapses and directly regulate the numbers of synapses, but it remains unclear whether running exercise can modulate astrocyte morphological complexity and astrocyte-contacted synapses in the hippocampus of the mice with depressive-like behavior. Male C57BL/6 J mice underwent four weeks of running exercise after four weeks of chronic unpredictable stress (CUS). The sucrose preference test (SPT), tail suspension test (TST) and forced swim test (FST) were used to assess anhedonia in mice. Western blotting was used to measure the expression of astrocyte- and synapse-related proteins. Immunofluorescence and 3D reconstruction were used to quantify the density and morphology of astrocytes, and astrocyte-contacted synapses in each hippocampal subregion. Four weeks of running exercise alleviated depressive-like symptoms in mice. The expression of astrocyte- and synapse-related proteins in the hippocampus; astrocyte process lengths, process numbers, and dendritic arborization; and the number of astrocyte-contacted PSD95 positive synapses in the CA2-3 and DG regions were significantly decreased in the mice with depressive-like behavior, and running exercise successfully reserved these changes. Running exercise improved the decreases in astrocyte morphological complexity and astrocyte-contacted PSD95 positive synapses in the CA2-3 and DG regions of the mice with depressive-like behavior, suggesting that the physical interactions between astrocytes and synapses can be increased by running exercise, which might be an important structural basis for the antidepressant effects of running exercise.
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