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Regulation of the Neurodegenerative Process Associated to Parkinson's Disease by CD4+ T-cells
Hugo González1, Francisco Contreras1, Rodrigo Pacheco2,3
1Laboratory of Neuroimmunology, Fundación Ciencia & Vida, Avenida Zañartu #1482, Ñuñoa, 7780272, Santiago, Chile.
Abstract:
Neuroinflammation constitutes a fundamental process involved in the physiopathology of Parkinson's disease (PD). Microglial cells play a central role in the outcome of neuroinflammation and consequent neurodegeneration of dopaminergic neurons in the substantia nigra. Current evidence indicates that CD4+ T-cells infiltrate the central nervous system (CNS) in PD, where they play a critical role determining the functional phenotype of microglia, thus regulating the progression of the neurodegenerative process. Here, we first analysed the pathogenic role of inflammatory phenotypes and the beneficial role of anti-inflammatory phenotypes of encephalitogenic CD4+ T-cells involved in the physiopathology of PD. Next, we discussed how alterations of neurotransmitter levels observed in the basal ganglia throughout the time course of PD progression could be strongly affecting the behaviour of encephalitogenic CD4+ T-cells and thereby the outcome of the neuroinflammatory process and the consequent neurodegeneration of dopaminergic neurons. Afterward, we integrated the evidence indicating the involvement of an antigen-specific immune response mediated by T-cells and B-cells against CNS-derived self-constituents in PD. Consistent with the involvement of a relevant autoimmune component in PD, we also reviewed the polymorphisms of both, class I and class II major histocompatibility complexes, associated to the risk of PD. Overall, this study gives an overview of how an autoimmune component involved in PD plays a fundamental role in the progression of the neurodegenerative process.
Insights
Parkinson's disease (PD) involves neuroinflammation where CD4+ T-cells influence microglial function and dopaminergic neuron degeneration. Autoimmune responses and genetic factors contribute to PD progression.
Area of Science:
- Neuroimmunology
- Neurodegeneration
- Parkinson's Disease Pathophysiology
Background:
- Neuroinflammation is central to Parkinson's disease (PD) pathogenesis.
- Microglia critically regulate neuroinflammation and dopaminergic neuron loss in PD.
- CD4+ T-cells infiltrate the central nervous system (CNS) in PD, modulating microglial phenotypes and neurodegeneration.
Purpose of the Study:
- To analyze the pathogenic and beneficial roles of CD4+ T-cell phenotypes in PD.
- To investigate how neurotransmitter alterations in PD affect T-cell behavior and neuroinflammation.
- To review evidence for antigen-specific autoimmune responses and MHC polymorphisms in PD.
Main Methods:
- Analysis of pathogenic and anti-inflammatory CD4+ T-cell phenotypes in PD.
- Discussion of neurotransmitter level alterations impacting T-cells in PD.
- Integration of evidence on T-cell, B-cell, and MHC polymorphisms in PD pathogenesis.
Main Results:
- Encephalitogenic CD4+ T-cells exhibit both pathogenic (inflammatory) and beneficial (anti-inflammatory) roles in PD.
- Neurotransmitter level changes in PD significantly influence CD4+ T-cell behavior and neuroinflammatory outcomes.
- Evidence supports an antigen-specific autoimmune response involving T-cells and B-cells, with MHC polymorphisms linked to PD risk.
Conclusions:
- An autoimmune component is fundamental to PD progression, influencing neuroinflammation and dopaminergic neurodegeneration.
- CD4+ T-cells and their interaction with microglia are key regulators of PD's neuroinflammatory landscape.
- Understanding these immune mechanisms offers potential therapeutic targets for Parkinson's disease.
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