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      Cytokines disrupt intracellular patterns of Parkinson's disease-associated proteins alpha-synuclein, tau and ubiquitin in cultured glial cells.

      Brain Research
      Cells, Cultured, Cytokines, metabolism, Humans, Microscopy, Fluorescence, Neuroglia, chemistry, Parkinson Disease, Ubiquitin, alpha-Synuclein, tau Proteins

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          Abstract

          The purpose of this study was to determine the effects of specific proinflammatory cytokines interleukin-6 (Il-6), interleukin-1beta (Il-1beta), interferon-gamma (IFN), and tumor necrosis factor-alpha (TNFalpha), on content and distribution of alpha-synuclein (alpha-synuclein), tau and ubiquitin in human derived cultured glial cells. Exposure paradigms mimicked acute (2 h), intermediate (18 h) and prolonged time frames (96 h); consisting of single or repeated low doses (10 ng/ml) or high doses (50 ng/ml), consistent with either mild or serious systemic infectious/inflammatory responses. Images of intracellular protein content and distribution were reconstructed from emission patterns generated by fluorescence deconvolution microscopy. Minor alterations were seen in protein content with IFN; Il-1beta decreased alpha-synuclein and tau at 18 and 96 h; TNFalpha inversely reduced alpha-synuclein and increased ubiquitin content. Combinations of Il-1beta and IFN produced a robust increase of alpha-synuclein and tau at 2 h. Consecutive low doses of Il-6 produced only minor increases in alpha-synuclein and ubiquitin after 4 h, whereas a single high dose resulted in major increases for all three proteins over the first 18 h. Protein localization patterns were distinctly different and were altered dependent upon cytokine treatment. A high dose exposure (2 x 50 ng/ml) with Il-6 and IFN demonstrated that protein increases and dispersals could be sustained and that the normal perinuclear tau and peripheral alpha-synuclein patterns were disrupted. These results support the postulate that specific cytokines affect temporal protein changes with concomitant pattern disruptions, possibly reflecting a mechanism of cell dysfunction in Parkinson's degeneration.

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          Author and article information

          Journal
          18501880
          10.1016/j.brainres.2008.03.081

          Chemistry
          Cells, Cultured,Cytokines,metabolism,Humans,Microscopy, Fluorescence,Neuroglia,chemistry,Parkinson Disease,Ubiquitin,alpha-Synuclein,tau Proteins

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