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

Brain Res. 2008 Jun 27:1217:203-12. doi: 10.1016/j.brainres.2008.03.081. Epub 2008 Apr 10.

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.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

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

Substances

  • Cytokines
  • Ubiquitin
  • alpha-Synuclein
  • tau Proteins