Journal of Ginseng Research

The Korean Society of Ginseng (고려인삼학회)
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Anxiolytic effect of Korean Red Ginseng through upregulation of serotonin and GABA transmission and BDNF expression in immobilized mice

  • Bui, Bich Phuong (College of Pharmacy and Integrated Research Institute for Drug Development, Dongguk University-Seoul) ;
  • Nguyen, Phuong Linh (College of Pharmacy and Integrated Research Institute for Drug Development, Dongguk University-Seoul) ;
  • Do, Ha Thi Thu (College of Pharmacy and Integrated Research Institute for Drug Development, Dongguk University-Seoul) ;
  • Cho, Jungsook (College of Pharmacy and Integrated Research Institute for Drug Development, Dongguk University-Seoul)
  • Received : 2022.04.14
  • Accepted : 2022.07.26
  • Published : 2022.11.01
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Abstract

Background: Anxiolytic properties of Korean Red Ginseng (KRG) have been previously reported. However, the exact mechanism(s) of action remains to be elucidated. The present study investigated the effect of KRG on immobilization-induced anxiety-like behaviors in mice and explored the involvement of the serotonin and GABA systems and BDNF in the anxiolytic action. Methods: Mice were orally administered with KRG (200 mg/kg/day) for 4 weeks and immobilized once daily for 2 h. p-Chlorophenylalanine (p-CPA) was intraperitoneally injected on day 22-28, and flumazenil or bicuculline was injected on day 25-28. After behavioral evaluations, brains were dissected for biochemical analyses. Results: KRG improved immobilization-induced anxiety-like behaviors in mice, as assessed by the elevated plus maze (EPM) and marble burying tests (MBT). The anxiolytic effect of KRG was comparable to that of fluoxetine, a reference drug clinically used for anxiety disorders. A serotonin synthesis inhibitor, p-CPA, blocked the effect of KRG in the EPM and MBT, indicating the requirement of serotonin synthesis for anxiolytic action. In addition, the anxiolytic effect of KRG was inhibited by bicuculline (a GABAA antagonist) in MBT, implying the involvement of GABA transmission. Western blotting analyses revealed that KRG upregulated the expression of tryptophan hydroxylase and GABAA receptor in the brain, which was blocked by p-CPA. Enhanced BDNF expression by KRG in the hippocampus was also indicated to mediate the anxiolytic action of KRG in immobilized mice. Conclusion: KRG exhibited the anxiolytic effect in immobilized mice by multiple mechanisms of action, involving enhanced serotonin and GABA transmissions and BDNF expression.

Keywords

Acknowledgement

This work was supported by the Korean Society of Ginseng funded by the Korea Ginseng Cooperation (2019) and by the National Research Foundation of Korea (NRF) grant funded by the Korean government (MSIT) (No. NRF-2018R1A5A2023127).

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