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Interferon-γ Involvement in the Neuroinflammation Associated with Parkinson’s Disease and L-DOPA-Induced Dyskinesia

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Abstract

Interferon-γ (IFN-γ) is a proinflammatory cytokine that activates glial cells. IFN-γ is increased in the plasma and brain of Parkinson’s disease patients, suggesting its potential role in the disease. We investigated whether the IFN-γ deficiency could interfere with nigrostriatal degeneration induced by the neurotoxin 6-hydroxydopamine, L-DOPA-induced dyskinesia, and the neuroinflammatory features as astrogliosis, microgliosis, and induced nitric oxide synthase (iNOS) immunoreactivity induced by L-DOPA treatment. Wild type (WT) and IFN-γ knockout (IFN-γ/KO) mice received unilateral striatal microinjections of 6-hydroxydopamine. Animals were sacrificed 1, 3, 7, and 21 days after lesions. Additional group of WT and IFN-γ/KO parkinsonian mice, after 3 weeks of neurotoxin injection, received L-DOPA (intraperitoneally, for 21 days) resulting in dyskinetic-like behavior. Tyrosine hydroxylase immunostaining indicated the starting of dopaminergic lesion since the first day past toxin administration, progressively increased until the third day when it stabilized. There was no difference in the lesion and L-DOPA-induced dyskinesia intensity between WT and IFN-γ/KO mice. Remarkably, IFN-γ/KO mice treated with L-DOPA presented in the lesioned striatum an increase of iNOS and glial fibrilary acid protein (GFAP) density, compared with the WT group. Morphological analysis revealed the rise of astrocytes and microglia reactivity in IFN-γ/KO mice exibiting dyskinesia. In conclusion, IFN-γ/KO mice presented an intensification of the inflammatory reaction accompanying L-DOPA treatment and suggest that iNOS and GFAP increase, and the activation of astrocytes and microglia induced afterward L-DOPA treatment was IFN-γ independent events. Intriguingly, IFN-γ absence did not affect the degeneration of dopaminergic neurons or LID development.

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Acknowledgements

The authors wish to thank Dr. André Luis Bombeiro for the helpful suggestions on this study and Célia Aparecida da Silva for the technical support.

Funding

The authors received financial support and grants provided by the Brazilian agencies: Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES), Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP 2014/25029-4), and Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq 402658/2012-4). EDB is a CNPq research fellow. DPF was recipient of FAPESP fellowship 2017/14419-4.

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Contributions

MZ and EDB designed this study. DPF carried out the animal experiments and molecular analysis. DPF performed the statistical analysis and provided the figures. DPF, EDB, and MZ wrote the manuscript. All authors read and approved the final manuscript.

Corresponding author

Correspondence to E. A. Del Bel.

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Ethics Approval

All experimental procedures were approved by the local Animal Care and Use Committee of the University of São Paulo/Brazil at the Ribeirao Preto campus (2017.1.369.58.4).

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The authors declare that they have no conflict of interest.

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Ferrari, D.P., Bortolanza, M. & Del Bel, E. Interferon-γ Involvement in the Neuroinflammation Associated with Parkinson’s Disease and L-DOPA-Induced Dyskinesia. Neurotox Res 39, 705–719 (2021). https://doi.org/10.1007/s12640-021-00345-x

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  • DOI: https://doi.org/10.1007/s12640-021-00345-x

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