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Standardised ginseng extract G115® potentiates the antidepressant-like properties of fluoxetine in the forced swim test

Published online by Cambridge University Press:  22 January 2021

Dylan J. Terstege Open the ORCID record for Dylan J. Terstege [Opens in a new window] ,
Debra S. MacDonald  and
R. Andrew Tasker Open the ORCID record for R. Andrew Tasker [Opens in a new window]
Dylan J. Terstege
Affiliation:
Department of Biomedical Sciences, University of Prince Edward Island, Charlottetown, Canada
Debra S. MacDonald
Affiliation:
Department of Biomedical Sciences, University of Prince Edward Island, Charlottetown, Canada
R. Andrew Tasker*
Affiliation:
Department of Biomedical Sciences, University of Prince Edward Island, Charlottetown, Canada Translational Neuropsychiatry Unit, Clinical Medicine, Aarhus Universitet, Aarhus, Denmark
*
Author for correspondence: R. Andrew Tasker, Email: tasker@upei.ca
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Abstract

Objective:

Ginsenosides, biologically active components of the root of Panax ginseng, have been reported to have therapeutic benefits in a number of disease states including psychiatric conditions such as major depressive disorder. Our objective was to determine if a standardised commercial ginseng extract, G115®, could reduce the signs of behavioural despair commonly observed in animal models of depression either alone or in combination with the selective serotonin reuptake inhibitor (SSRI) fluoxetine.

Methods:

Male Sprague-Dawley (SD) rats (N = 51) were divided into four groups: vehicle control, G115® ginseng root extract, fluoxetine and fluoxetine plus G115®. Rats were trained to voluntarily consume treatments twice daily for 14 days and were then tested in an open field (OF), elevated plus maze (EPM) and forced swim test (FST). Post-mortem hippocampal and prefrontal cortex tissue was analysed for expression of brain-derived neurotrophic factor (BDNF) and tropomyosin receptor kinase B (TrkB) by western blot.

Results:

One-way Analysis of Variance revealed no significant group differences in the OF or plus-maze performance on any variable examined. In the FST, fluoxetine significantly reduced immobility time and increased latency to immobility. The effects of fluoxetine were further significantly potentiated by co-administration of G115®. Post-mortem tissue analysis revealed significant group differences in BDNF expression in the left hippocampus and left prefrontal cortex without any accompanying changes in TrkB expression.

Conclusions:

We conclude that oral G115® significantly potentiates the antidepressant-like effect of fluoxetine in the FST in the absence of potentially confounding effects on locomotion and anxiety.

Keywords

ginsenosidesdepressionlearned helplessnessbrain-derived neurotrophic factoranxiety
Type
Original Article
Information
Acta Neuropsychiatrica , Volume 33 , Issue 3 , June 2021 , pp. 141 - 147
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Copyright
© The Author(s), 2021. Published by Cambridge University Press on behalf of Scandinavian College of Neuropsychopharmacology

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Footnotes

#

Current Address: Department of Cell Biology and Anatomy, Cumming School of Medicine, University of Calgary, Calgary, Alberta, Canada

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