Abstract
Clinical and neurobiological findings have reported the involvement of endocannabinoid signaling in the pathophysiology of schizophrenia. This system modulates dopaminergic and glutamatergic neurotransmission that is associated with positive, negative, and cognitive symptoms of schizophrenia. Despite neurotransmitter impairments, increasing evidence points to a role of glial cells in schizophrenia pathobiology. Glial cells encompass three main groups: oligodendrocytes, microglia, and astrocytes. These cells promote several neurobiological functions, such as myelination of axons, metabolic and structural support, and immune response in the central nervous system. Impairments in glial cells lead to disruptions in communication and in the homeostasis of neurons that play role in pathobiology of disorders such as schizophrenia. Therefore, data suggest that glial cells may be a potential pharmacological tool to treat schizophrenia and other brain disorders. In this regard, glial cells express cannabinoid receptors and synthesize endocannabinoids, and cannabinoid drugs affect some functions of these cells that can be implicated in schizophrenia pathobiology. Thus, the aim of this review is to provide data about the glial changes observed in schizophrenia, and how cannabinoids could modulate these alterations.
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Abbreviations
- ∆9-THC:
-
Delta-9-tetrahydrocannabinol
- 2-AG:
-
2-Arachidonoylglycerol
- AEA:
-
Anandamide
- CB1:
-
Type 1 cannabinoid receptor
- CB2:
-
Type 2 cannabinoid receptor
- CNR1:
-
Cannabinoid receptor type-1 gene
- CNR2:
-
Cannabinoid receptor type-2 gene
- COX:
-
Cyclooxygenase
- DAGLα:
-
Diacylglycerol lipase alpha
- DAGLβ:
-
Diacylglycerol lipase beta
- DISC-1:
-
Disrupted in schizophrenia-1
- FAAH:
-
Fatty acid amide hydrolase
- GFAP:
-
Glial fibrillary acid protein
- GLAST:
-
Glutamate aspartate transporter
- GLT-1:
-
Astrocytic glutamate transporter-1
- GPR55:
-
G protein-coupled receptor 55
- IL-1:
-
Interleukin 1
- IL-6:
-
Interleukin 6
- KO:
-
Knockout
- LPS:
-
Lipopolysaccharide
- MAGL:
-
Monoacylglycerol lipase
- NAPE:
-
N-Acyl-phosphatidylethanolamine-phospholipase
- NMDA:
-
N-Methyl-d-aspartate
- OPCs:
-
Oligodendrocyte precursor cells
- PPARγ:
-
Peroxisome proliferator-activated receptor
- TNF-α:
-
Tumor necrosis factor alpha
- TRPV1:
-
Transient receptor potential vanilloid 1
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Acknowledgements
This work was supported by Grant from the ‘Fundação de Amparo à Pesquisa do Estado de São Paulo’ (FAPESP Grant number 2013/08711-3 and 2014/10068-4), ‘Coordenação de Aperfeiçoamento de Pessoal de Nível Superior’ (Capes Grant number 1656470), and Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq Grant 460289/2014-4). DMS is also supported by Instituto Serrapilheira, Brazil (grant G-1709-16349).
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AV conceived the study, designed, and wrote the first draft and final version of manuscript. MSD conceived, supervised, and finalized the manuscript.
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de Almeida, V., Martins-de-Souza, D. Cannabinoids and glial cells: possible mechanism to understand schizophrenia. Eur Arch Psychiatry Clin Neurosci 268, 727–737 (2018). https://doi.org/10.1007/s00406-018-0874-6
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DOI: https://doi.org/10.1007/s00406-018-0874-6