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Apelin-13 Upregulates BDNF Against Chronic Stress-induced Depression-like Phenotypes by Ameliorating HPA Axis and Hippocampal Glucocorticoid Receptor Dysfunctions.

Neuroscience. 2018 Oct 15;390:151-159. Epub 2018 Aug 29
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摘要


Localization of apelin and its receptor APJ in limbic structures such as the hippocampus suggests potential involvement of apelin/APJ signaling in stress-related emotional responses. We have recently reported that apelin-13 exerts antidepressant-like actions in acute stressed rats, and that the hippocampus is a critical brain region mediating its actions. However, the neural mechanism underling antidepressant-like actions of apelin-13 is still largely unknown. The aim of the present study is to determine whether apelin-13 ameliorates chronic water-immersion restraint stress (CWIRS)-induced depression-like phenotypes and its neural mechanism in rats. Here, we report that CWIRS exposure leaded to upregulation of apelin/APJ signaling in the hippocampus. Apelin-13 ameliorated CWIRS-induced depression-like phenotypes including hedonic-like deficit and behavioral despairs. Moreover, apelin-13 ameliorated hypothalamic-pituitary-adrenal (HPA) axis hyperactivity, and hippocampal BDNF expression deficit and glucocorticoid receptor (GR) nucleus translocation hypoactivity in chronic stressed rats. Finally, apelin-13-mediated effects were blocked by the selective TrkB receptor antagonist ANA-12. These results suggest that apelin-13 upregulates BDNF against chronic stress-induced depression-like phenotypes by ameliorating HPA axis and hippocampal GR dysfunctions.

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