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Involvement of serotonergic neurotransmission in the antidepressant-like effect elicited by cholecalciferol in the chronic unpredictable stress model in mice

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Abstract

Cholecalciferol deficiency has been associated with stress-related psychiatric disorders, particularly depression. Therefore, the present study investigated the antidepressant-like effect of cholecalciferol in female mice and the possible role of the serotonergic system in this response. The ability of cholecalciferol to elicit an antidepressant-like effect and to modulate serotonin levels in the hippocampus and prefrontal cortex of mice subjected to chronic unpredictable stress (CUS) was also investigated. The administration of cholecalciferol (2.5, 7.5, and 25 µg/kg, p.o.) for 7 days, similar to fluoxetine (10 mg/kg, p.o., serotonin reuptake inhibitor), reduced the immobility time in the tail suspension test, without altering the locomotor performance in the open-field test. Moreover, the administration of p-chlorophenylalanine methyl ester (PCPA – 100 mg/kg, i.p., for 4 days, a selective inhibitor of tryptophan hydroxylase, involved in the serotonin synthesis) abolished the antidepressant-like effect of cholecalciferol and fluoxetine in the tail suspension test, demonstrating the involvement of serotonergic system. Additionally, CUS protocol (21 days) induced depressive-like behavior in the tail suspension test and decreased serotonin levels in the prefrontal cortex and hippocampus of mice. Conversely, the administration of cholecalciferol and fluoxetine in the last 7 days of CUS protocol completely abolished the stress-induced depressive-like phenotype. Cholecalciferol was also effective to abrogate CUS-induced reduction on serotonin levels in the prefrontal cortex, but not in the hippocampus. Our results indicate that cholecalciferol has an antidepressant-like effect in mice by modulating the serotonergic system and support the assumption that cholecalciferol may have beneficial effects for the management of depression.

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All data generated or analyzed during this study are included in this published article.

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Acknowledgements

The authors thank funding agencies CNPq and CAPES by the financial support.

Funding

This study was supported by Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq, #310113/2017–2; #421143/2018–5; #158126/2018–1), and Coordenação de Aperfeiçoamento de Pessoal de Ensino Superior (CAPES). ALSR and ALD are CNPq Research Fellows.

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Contributions

ALSR, VBN, IW, and ALD designed the study and wrote the protocol. VBN, IW, MM, PBR, AC, YOD, NP, AFR, WDE, GRLA, IS, and administered the drugs, carried out CUS protocol, performed the behavioral and neurochemical tests. VBN, IW and AC undertook the statistical analysis. VBN, IW and AC wrote the first draft of the manuscript. All authors approved the final manuscript.

Corresponding author

Correspondence to Ana Lúcia S. Rodrigues.

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All procedures were carried out in accordance with the National Institute of Health Guide for the Care and Use of Laboratory Animals and the protocols were approved by the Institutional Ethics Committee.

Conflict of interest

The authors declare that no financial support or compensation has been received from any individual or corporate entity over the past three years for research or professional service, and there is no personal financial holding that could be perceived as constituting a potential conflict of interest.

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Neis, V.B., Werle, I., Moretti, M. et al. Involvement of serotonergic neurotransmission in the antidepressant-like effect elicited by cholecalciferol in the chronic unpredictable stress model in mice. Metab Brain Dis 37, 1597–1608 (2022). https://doi.org/10.1007/s11011-022-00979-6

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  • DOI: https://doi.org/10.1007/s11011-022-00979-6

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