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Published in: Neurotoxicity Research 1/2017

01-07-2017 | ORIGINAL ARTICLE

Complex Changes in the Innate and Adaptive Immunity Accompany Progressive Degeneration of the Nigrostriatal Pathway Induced by Intrastriatal Injection of 6-Hydroxydopamine in the Rat

Authors: Giulia Ambrosi, Natasa Kustrimovic, Francesca Siani, Emanuela Rasini, Silvia Cerri, Cristina Ghezzi, Giuseppe Dicorato, Sofia Caputo, Franca Marino, Marco Cosentino, Fabio Blandini

Published in: Neurotoxicity Research | Issue 1/2017

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Abstract

We investigated changes in innate and adaptive immunity paralleling the progressive nigrostriatal damage occurring in a neurotoxic model of Parkinson’s disease (PD) based on unilateral infusion of 6-hydroxydopamine (6-OHDA) into the rat striatum. A time-course analysis was conducted to assess changes in morphology (activation) and cell density of microglia and astrocytes, microglia polarization (M1 vs. M2 phenotype), lymphocyte infiltration in the lesioned substantia nigra pars compacta (SNc), and modifications of CD8+ and subsets of CD4+ T cell in peripheral blood accompanying nigrostriatal degeneration. Confirming previous results, we observed slightly different profiles of activation for astrocytes and microglia paralleling nigral neuronal loss. For astrocytes, morphological changes and cell density increases were mostly evident at the latest time points (14 and 28 days post-surgery), while moderate microglia activation was present since the earliest time point. For the first time, in this model, we described the time-dependent profile of microglia polarization. Activated microglia clearly expressed the M2 phenotype in the earlier phase of the experiment, before cell death became manifest, gradually shifting to the M1 phenotype as SNc cell death started. In parallel, a reduction in the percentage of circulating CD4+ T regulatory (Treg) cells, starting as early as day 3 post-6-OHDA injection, was detected in 6-OHDA-injected rats. Our data show that nigrostriatal degeneration is associated with complex changes in central and peripheral immunity. Microglia activation and polarization, Treg cells, and the factors involved in their cross-talk should be further investigated as targets for the development of therapeutic strategies for disease modification in PD.
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Metadata
Title
Complex Changes in the Innate and Adaptive Immunity Accompany Progressive Degeneration of the Nigrostriatal Pathway Induced by Intrastriatal Injection of 6-Hydroxydopamine in the Rat
Authors
Giulia Ambrosi
Natasa Kustrimovic
Francesca Siani
Emanuela Rasini
Silvia Cerri
Cristina Ghezzi
Giuseppe Dicorato
Sofia Caputo
Franca Marino
Marco Cosentino
Fabio Blandini
Publication date
01-07-2017
Publisher
Springer US
Published in
Neurotoxicity Research / Issue 1/2017
Print ISSN: 1029-8428
Electronic ISSN: 1476-3524
DOI
https://doi.org/10.1007/s12640-017-9712-2

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