Abstract
Since the discovery of ketamine anti-depressant effects in last decade, it has effectively revitalized interest in investigating excitatory synapses hypothesis in the pathogenesis of depression. In the present study, we aimed to reveal the excitatory synaptic regulation of corticotropin-releasing hormone (CRH) neuron in the hypothalamus, which is the driving force in hypothalamic–pituitary–adrenal (HPA) axis regulation. This study constitutes the first observation of an increased density of PSD-93-CRH co-localized neurons in the hypothalamic paraventricular nucleus (PVN) of patients with major depression. PSD-93 overexpression in CRH neurons in the PVN induced depression-like behaviors in mice, accompanied by increased serum corticosterone level. PSD-93 knockdown relieved the depression-like phenotypes in a lipopolysaccharide (LPS)-induced depression model. Electrophysiological data showed that PSD-93 overexpression increased CRH neurons synaptic activity, while PSD-93 knockdown decreased CRH neurons synaptic activity. Furthermore, we found that LPS induced increased the release of glutamate from microglia to CRH neurons resulted in depression-like behaviors using fiber photometry recordings. Together, these results show that PSD-93 is involved in the pathogenesis of depression via increasing the synaptic activity of CRH neurons in the PVN, leading to the hyperactivity of the HPA axis that underlies depression-like behaviors.
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This work was supported by National Natural Science Foundation of China (91732304 and 32030046), and the Strategic Priority Research Program of the Chinese Academy of Sciences (XDB02030001 and XDB32020200). We are grateful to the Netherlands Brain Bank for providing human brain material and clinical details. We thank Dr. Zhi Zhang (USTC) for providing the Cx3cr1-CreERT2 mice.
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J-NZ designed the studies. X-YQ and Q-HS performed most of the experiments and data analysis, and wrote the draft manuscript. HF, YW, and PC conducted some of the molecular experiments and behavioral experiments. Z-QX provided the plasmid. DS provided the human brain tissue and was involved in the revision of the manuscript. X-YQ and J-NZ wrote the paper.
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Qin, XY., Shan, QH., Fang, H. et al. PSD-93 up-regulates the synaptic activity of corticotropin-releasing hormone neurons in the paraventricular nucleus in depression. Acta Neuropathol 142, 1045–1064 (2021). https://doi.org/10.1007/s00401-021-02371-7
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DOI: https://doi.org/10.1007/s00401-021-02371-7