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A dual inhibitor of FAAH and TRPV1 channels shows dose-dependent effect on depression-like behaviour in rats

  • Christian Kirkedal (a1), Gregers Wegener (a1) (a2), Fabricio Moreira (a3), Sâmia Regiane Lourenco Joca (a1) (a4) and Nico Liebenberg (a1)...

Abstract

Objective

The cannabinoid receptor 1 (CB1) and transient receptor potential cation channel subfamily V member 1 (TRPV1) are proposed to mediate opposite behavioural responses. Their common denominator is the endocannabinoid ligand anandamide (AEA), which is believed to mediate antidepressant-like effect via CB1-R stimulation and depressive-like effect via TRPV1 activation. This is supposed to explain the bell-shaped dose-response curve for anandamide in preclinical models.

Methods

We investigated this assumption by administering the dual inhibitor of AEA hydrolysis and TRPV1 activation N-arachidonoyl-serotonin (AA-5HT) into the medial prefrontal cortex of rats. AA-5HT was given in three different doses (0.125, 0.250, 0.500 nmol/0.4 µl/side) and rat behaviour was assessed in the forced swim test.

Results

Our results show significant antidepressant-like effect of AA-5HT (0.250 nmol) but no effects of low or high doses. The effect of 0.250 nmol AA-5HT was partially attenuated when coadministering the inverse CB1-agonist rimonabant (1.6 µg).

Conclusion

A 0.250 nmol of AA-5HT administration into the medial prefrontal cortex induced a significant antidepressant-like effect that was partially attenuated by locally blocking CB1-receptor.

Copyright

Corresponding author

Christian Kirkedal, Translational Neuropsychiatric Unit, Departments of Clinical Medicine, Aarhus University, 8240, Risskov Denmark. Tel: +45 7847 1100; Fax: +45 7847 1108; E-mail: Christian.kirkedal@clin.au.dk

References

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Keywords

A dual inhibitor of FAAH and TRPV1 channels shows dose-dependent effect on depression-like behaviour in rats

  • Christian Kirkedal (a1), Gregers Wegener (a1) (a2), Fabricio Moreira (a3), Sâmia Regiane Lourenco Joca (a1) (a4) and Nico Liebenberg (a1)...

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