Abstract
Depression is a major social and health problem worldwide. Compound K (CK), an intestinal metabolite of panaxadiol ginsenosides, has been demonstrated to possess significant pharmacological effects on the central nervous system (CNS). Here, we set up this study to investigate the antidepressant effect of CK, and to explore the potential mechanisms underlying this activity. The behavioral despair model and chronic unpredictable mild stress (CUMS) model were established in mice or rats, respectively. Forced swimming test (FST), tail suspension test (TST) and locomotor activity were performed in mice, while the open-field test, food consumption and sucrose preference were assessed in rats. To investigate the underlying mechanism, the levels of endogenous noradrenaline, dopamine (DA), 5-hydroxytryptamine (5-HT) and their metabolites in the prefrontal cortex (PFC) and hippocampus were detected by HPLC coupled with electron detector. The dopamine degradation enzyme (COMT and MAO) expression was measured by western blot. The BDNF and NGF expression were investigated by immunohistochemical staining analysis. The results showed CK (10, 30 mg/kg) intragastric administration for 14 days significantly shorten the immobility time in FST and TST, which could be partially reversed by a D1 receptor antagonist Sch23390. For CUMS rats, CK alleviated the depressant-like behaviors, including decreased food consumption, spontaneous locomotor activity and lower sucrose preference, while WAY-100635, a 5-HT1A receptor antagonist, could attenuate this effect. In addition, CK increased the levels of 5-HT, DA and their metabolites in the PFC and hippocampus of CUMS rats, and could reverse overexpression of MAOB in PFC and hippocampus. CK also increased the GSH and GPx activity in the hippocampus and PFC. The IHC results revealed the BDNF and NGF expression were increased in CK-treated rats. The obtained results indicate that CK exhibits antidepressant effects in rodents, which may be due to the regulation of monoamine neurotransmitter concentration, enhancement of antioxidant capacity, as well as increase of neurotrophin expression in the CNS.
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This work was partly supported by a grant from the Science and technology project of Jilin provincial administration of traditional Chinese Medicine: 2017160 and National Natural Science Foundation of China (NSFC): 81603324.
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Song, W., Guo, Y., Jiang, S. et al. Antidepressant Effects of the Ginsenoside Metabolite Compound K, Assessed by Behavioral Despair Test and Chronic Unpredictable Mild Stress Model. Neurochem Res 43, 1371–1382 (2018). https://doi.org/10.1007/s11064-018-2552-5
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DOI: https://doi.org/10.1007/s11064-018-2552-5