Abstract
Although the antidepressant-like effect of magnolol has been revealed in previous reports, the mechanism remains unclear. In this study, the antidepressant-like effect of magnolol on corticosterone-induced (CORT-induced) mice was investigated in vivo. After 21 days of CORT induction, the mice showed marked depressive-like behaviors, with a decrease in sucrose preference score and an increase in immobility time in the tail suspension test (TST) and forced swimming test (FST). Pretreatment with either magnolol (50 mg/kg, i.p.) or the kappa opioid receptor (KOR) antagonist nor-BNI (10 mg/kg, i.p.) prevented CORT-induced depression-like behavior and reduced CORT-induced dynorphin (DYN A) elevation in the hippocampal ventral DG. However, no depression-like behavior was observed in mice with KOR downregulation in the ventral DG. We further found that upregulation of DYN A in the DG caused depression-like behavior, which was blocked by intraperitoneal injection of nor-BNI and modulated by magnolol. The present study demonstrated that magnolol could ameliorate CORT-induced depression-like behaviors, by modulating the DYN A/KOR system in the ventral DG of the hippocampus.
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We appreciate the technical support from the Public Platform of Medical Research Center, Academy of Chinese Medical Science, Zhejiang Chinese Medical University.
Funding
This work was supported by the Zhejiang Provincial Natural Science Foundation of China under Grant No. LY22H270004, by the National Natural Science Foundation of China under Grant No. 82030112, and by Zhejiang Chinese Medical University under Grant No. 2022 FSYYZZ11.
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CX, JY and JL conceived and designed the experiments; CX, JY and YS performed the experiments; CX, JY, XS and JL analyzed the data; CX and JY wrote the paper.
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The current study was performed with the approval of the Association for Assessment and Accreditation of Laboratory Animal Care (AAALAC). All experimental procedures were approved by the Animal Ethics Committee of Zhejiang Chinese Medical University (permission number: IACUC-20220328-09) and conducted according to the National Institute of Health Guide for the Care and Use of Laboratory Animals (NIH Publications No. 80-23).
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Xu, C., Ye, J., Sun, Y. et al. The Antidepressant Effect of Magnolol on Depression-Like Behavior of CORT-Treated Mice. J Mol Neurosci 74, 3 (2024). https://doi.org/10.1007/s12031-023-02185-0
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DOI: https://doi.org/10.1007/s12031-023-02185-0