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Cell type-specific Nrf2 expression in multiple sclerosis lesions.

Simon Licht-Mayer1, Isabella Wimmer, Sarah Traffehn

  • 1Department of Neuroimmunology, Center for Brain Research, Medical University of Vienna, Spitalgasse 4, 1090, Vienna, Austria.

Acta Neuropathologica
|June 20, 2015
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Summary
This summary is machine-generated.

Nuclear factor (erythroid-derived 2)-like 2 (Nrf2) is upregulated in active multiple sclerosis (MS) lesions, particularly in oligodendrocytes. This suggests Nrf2

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Area of Science:

  • Neuroscience
  • Immunology
  • Pathology

Background:

  • Oxidative injury significantly contributes to demyelination and neurodegeneration in multiple sclerosis (MS).
  • Endogenous antioxidant defenses in MS lesions are often insufficient to prevent damage.
  • Therapies for MS aim to enhance antioxidant defenses by targeting the Nrf2 pathway.

Purpose of the Study:

  • To investigate the expression and activity of nuclear factor (erythroid-derived 2)-like 2 (Nrf2) in active multiple sclerosis (MS) lesions.
  • To determine the cellular localization and functional implications of Nrf2 in the context of MS pathology.
  • To analyze the differential gene expression of Nrf2-responsive genes in white matter and gray matter MS lesions.

Main Methods:

  • Immunohistochemistry to detect Nrf2 and its downstream targets (heme oxygenase 1) in MS lesions.
  • Analysis of Nrf2 expression in different cell types, including oligodendrocytes and neurons.
  • Whole-genome microarray analysis to identify differentially expressed Nrf2-responsive genes in MS lesions.

Main Results:

  • Nrf2 is strongly upregulated in active MS lesions, with prominent nuclear expression in oligodendrocytes.
  • Functional Nrf2 activity, indicated by heme oxygenase 1 expression, is observed in oligodendrocytes within MS lesions.
  • Nrf2 expression is highest in degenerating cells exhibiting signs of apoptosis or necrosis.
  • Differential expression of numerous Nrf2-responsive genes involved in oxidative stress defense occurs in actively demyelinating white matter lesions.
  • Distinct expression patterns of Nrf2-induced genes are observed between white matter and cortical gray matter in MS.

Conclusions:

  • Nrf2 is significantly upregulated in active MS lesions, particularly in oligodendrocytes, and is associated with active demyelination.
  • The Nrf2 pathway is active in oligodendrocytes within MS lesions, suggesting a role in cellular defense against oxidative stress.
  • Nrf2 expression patterns and the response of its target genes vary across different cell types and anatomical regions (white vs. gray matter) in the MS brain.