Abstract
Aim:
N-methyl-D-aspartic acid (NMDA) receptor modulators have shown promising results as potential antidepressant agents, whereas timosaponins extracted from the Chinese herb Rhizoma Anemarrhenae exhibit antidepressant activities. In the present study we examined whether YY-23, a modified metabolite of timosaponin B-III, could affect NMDA receptors in rat hippocampal neurons in vitro, and evaluated its antidepressant-like effects in stressed mice.
Methods:
NMDA-induced currents were recorded in acutely dissociated rat hippocampal CA1 neurons using a whole-cell recording technique. C57BL/6 mice were exposed to a 6-week chronic mild stress (CMS) or a 10-d chronic social defeat stress (CSDS). The stressed mice were treated with YY-23 (20 mg·kg−1·d−1) or a positive-control drug, fluoxetine (10 mg·kg−1·d−1) for 3 weeks. Behavioral assessments were carried out every week.
Results:
In acutely dissociated rat hippocampal CA1 neurons, YY-23 selectively and reversibly inhibited NMDA-induced currents with an EC50 value of 2.8 μmol/L. This inhibition of NMDA-induced currents by YY-23 was non-competitive, and had no features of voltage-dependency or use-dependency. Treatment of the stressed mice with YY-23 not only reversed CMS-induced deficiency of sucrose preference and immobility time, and CSDS-induced reduction of social interaction, but also had faster onset as compared to fluoxetine.
Conclusion:
YY-23 is a novel non-competitive antagonist of NMDA receptors with promising rapid antidepressant-like effects in mouse models of CMS and CSDS depression.
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Acknowledgements
This work was supported by the National Natural Science Foundation (31128009 and 31171011 to Yang LI), the National Science & Technology Major Project 'Key New Drug Creation and Manufacturing Program' (2014ZX09102-001-005 to Cheng-gang HUANG), and the Ministry of Science and Technology (2013CB910601 to Yang LI).
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Zhang, Q., Guo, F., Fu, Zw. et al. Timosaponin derivative YY-23 acts as a non-competitive NMDA receptor antagonist and exerts a rapid antidepressant-like effect in mice. Acta Pharmacol Sin 37, 166–176 (2016). https://doi.org/10.1038/aps.2015.111
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DOI: https://doi.org/10.1038/aps.2015.111
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