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Parkinsonism Relat Disord. 2005 Dec;11(8):493-8. Epub 2005 Sep 9.

Alterations of T-lymphocyte populations in Parkinson disease.

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Department of Neurology, Fukuoka University School of Medicine, 7-45-1 Nanakuma, Johnan-ku, Fukuoka 814-0180, Japan.


Immune reaction-related inflammation may be important in the pathogenesis of Parkinson disease (PD). To elucidate peripheral immunologic alterations in PD, we characterized extended peripheral T-lymphocyte populations in 33 patients with PD and 34 normal subjects. Patients with PD had significantly decreased CD4+:CD8(+)T-cell ratios (P<0.001), fewer CD4(+)CD25(+)T cells (P<0.01), and significantly increased ratios of IFN-gamma-producing to IL-4-producing T cells (P<0.001). The characteristics of predominant expression of CD8(+)T cells, depletion of CD4(+)CD25(high) cells, and a shift to a T(H)1-type immune response in the peripheral immune system in PD patients may reflect an immune reaction-associated inflammatory process in the brain.

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