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Cannabidiol improves non-motor symptoms, attenuates neuroinflammation, and favours hippocampal newborn neuronal maturation in a rat model of Parkinsonism

Published online by Cambridge University Press:  21 May 2024

Bianca Andretto de Mattos
Affiliation:
Department of Pharmacology and Therapeutics, State University of Maringá, Maringá, Paraná, Brazil
Jéssica Mendes Bonato
Affiliation:
Department of Pharmacology and Therapeutics, State University of Maringá, Maringá, Paraná, Brazil
Maria Clara Splendor
Affiliation:
Department of Pharmacology and Therapeutics, State University of Maringá, Maringá, Paraná, Brazil
Elaine Del Bel
Affiliation:
Department of Basic and Oral Biology, School of Medicine, USP, Ribeirão Preto, São Paulo, Brazil
Humberto Milani
Affiliation:
Department of Pharmacology and Therapeutics, State University of Maringá, Maringá, Paraná, Brazil
Rúbia Maria Weffort de Oliveira*
Affiliation:
Department of Pharmacology and Therapeutics, State University of Maringá, Maringá, Paraná, Brazil
*
Corresponding author: Rúbia Maria Weffort de Oliveira; Email: [email protected]

Abstract

Objective:

To investigate the effects of cannabidiol (CBD) on emotional and cognitive symptoms in rats with intra-nigral 6-hydroxydopamine (6-OHDA) lesions.

Methods:

Adult male Wistar rats received bilateral intranigral 6-OHDA infusions and were tested in a battery of behavioural paradigms to evaluate non-motor symptoms. The brains were obtained to evaluate the effects of CBD on hippocampal neurogenesis.

Results:

6-OHDA-lesioned rats exhibited memory impairments and despair-like behaviour in the novelty-suppressed feeding test and forced swim test, respectively. The animals also exhibited dopaminergic neuronal loss in the substantia nigra pars compacta (SNpc), striatum, and ventral tegmental area and a reduction of hippocampal neurogenesis. CBD decreased dopaminergic neuronal loss in the SNpc, reduced the mortality rate and decreased neuroinflammation in 6-OHDA-lesioned rats. In parallel, CBD prevented memory impairments and attenuated despair-like behaviour that were induced by bilateral intranigral 6-OHDA lesions. Repeated treatment with CBD favoured the neuronal maturation of newborn neurons in the hippocampus in Parkinsonian rats.

Conclusion:

The present findings suggest a potential beneficial effect of CBD on non-motor symptoms induced by intra-nigral 6-OHDA infusion in rats.

Type
Original Article
Copyright
© The Author(s), 2024. Published by Cambridge University Press on behalf of Scandinavian College of Neuropsychopharmacology

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