Abstract
Cannabidiol (CBD), a phytocannabinoid compound, presents antidepressant and anxiolytic-like effects in the type-1 diabetes mellitus(DM1) animal model. Although the underlying mechanism remains unknown, the type-1A serotonin receptor (5-HT1A) and cannabinoids type-1 (CB1) and type-2 (CB2) receptors seem to play a central role in mediating the beneficial effects on emotional responses. We aimed to study the involvement of these receptors on an antidepressant- and anxiolytic-like effects of CBD and on some parameters of the diabetic condition itself. After 2 weeks of the DM1 induction in male Wistar rats by streptozotocin (60 mg/kg; i.p.), animals were treated continuously for 2-weeks with the 5-HT1A receptor antagonist WAY100635 (0.1 mg/kg, i.p.), CB1 antagonist AM251 (1 mg/kg i.p.) or CB2 antagonist AM630 (1 mg/kg i.p.) before the injection of CBD (30 mg/kg, i.p.) or vehicle (VEH, i.p.) and then, they were submitted to the elevated plus-maze and forced swimming tests. Our findings show the continuous treatment with CBD improved all parameters evaluated in these diabetic animals. The previous treatment with the antagonists − 5-HT1A, CB1, or CB2 - blocked the CBD-induced antidepressant-like effect whereas only the blockade of 5-HT1A or CB1 receptors was able to inhibit the CBD-induced anxiolytic-like effect. Regarding glycemic control, only the blockade of CB2 was able to inhibit the beneficial effect of CBD in reducing the glycemia of diabetic animals. These findings indicated a therapeutic potential for CBD in the treatment of depression/anxiety associated with diabetes pointing out a complex intrinsic mechanism in which 5-HT1A, CB1, and/or CB2 receptors are differently recruited.
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The datasets generated during and/or analyzed during the current study are available from the corresponding author on reasonable request.
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Acknowledgements
YC Chaves is recipient of Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq, Brazil) fellowship.
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The present study was partially supported by a CNPq grants (Universal 01/2016; 408517/2016-6; CNPq/MS/SCTIE/DECIT N∘ 26/2014 – Pesquisas sobre Distúrbios Neuropsiquiátricos; 466805/2014-4). JAC is a recipient of fellowship awards from Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq, Brazil – 1A).
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Janaína M Zanoveli and Joice Maria da Cunha proposed the study and wrote the manuscript.
Yane C. Chaves conducted all behavioral tests.
José A Crippa and Karina Genaro kindly donate the cannabidiol.
All the authors contributed to the data analysis and interpretation and approved the final version of the manuscript.
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JAC is co-inventor (Mechoulam R, JC, Guimaraes FS, AZ, JH, Breuer A) of the patent “Fluorinated CBD compounds, compositions and uses thereof. Pub. No.: WO/2014/108899. International Application No.: PCT/IL2014/050023” Def. US no. Reg. 62,193,296; 29/07/2015; INPI on 19/08/2015 (BR1120150164927). The University of São Paulo has licensed the patent to Phytecs Pharm (USP Resolution No. 15.1.130002.1.1). The University of São Paulo has an agreement with Prati-Donaduzzi (Toledo, Brazil) to “develop a pharmaceutical product containing synthetic cannabidiol and prove its safety and therapeutic efficacy in the treatment of epilepsy, schizophrenia, Parkinson’s disease, and anxiety disorders.” JAC has received travel support from and was medical advisor of SCBD Centre. JAC has received a grant from University Global Partnership Network (UGPN) – “Global priorities in cannabinoid research excellence.” JAC is member of the international advisory board of The Australian Centre for Cannabinoid Clinical and Research Excellence (ACRE), funded by the National Health and Medical Research Council through the Centre of Research Excellence).
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Chaves, Y.C., Genaro, K., Crippa, J.A. et al. Cannabidiol induces antidepressant and anxiolytic‐like effects in experimental type-1 diabetic animals by multiple sites of action. Metab Brain Dis 36, 639–652 (2021). https://doi.org/10.1007/s11011-020-00667-3
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DOI: https://doi.org/10.1007/s11011-020-00667-3