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Nitrated alpha-synuclein (N-alpha-syn) immunization elicits adaptive immune responses to novel antigenic epitopes that exacerbate neuroinflammation and nigrostriatal degeneration in the 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine (MPTP) model of Parkinson's disease. We show that such neuroimmune degenerative activities, in significant measure, are Th17 cell-mediated, with CD4(+)CD25(+) regulatory T cell (Treg) dysfunction seen among populations of N-alpha-syn-induced T cells. In contrast, purified vasoactive intestinal peptide induced and natural Tregs reversed N-alpha-syn T cell nigrostriatal degeneration. Combinations of adoptively transferred N-alpha-syn and vasoactive intestinal peptide immunocytes or natural Tregs administered to MPTP mice attenuated microglial inflammatory responses and led to robust nigrostriatal protection. Taken together, these results demonstrate Treg control of N-alpha-syn-induced neurodestructive immunity and, as such, provide a sound rationale for future Parkinson's disease immunization strategies.

Regulatory T Cells Attenuate Th17 Cell-Mediated Nigrostriatal Dopaminergic Neurodegeneration in a Model of Parkinson’s Disease