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The emerging role of microRNAs in multiple sclerosis

Andreas Junker1, Reinhard Hohlfeld, Edgar Meinl

  • 1Department of Neuropathology, University Medical Center, Georg August University, Robert-Koch-Strasse 40, 37075 Göttingen, Germany.

Nature Reviews. Neurology
|December 15, 2010
PubMed

Insights

MicroRNAs (miRNAs) play a role in multiple sclerosis (MS) pathogenesis by altering immune cell function and myelin maintenance. Understanding these miRNA changes could lead to new MS therapies and biomarkers.

Area of Science:

  • Neuroimmunology
  • Molecular Biology
  • Genetics

Background:

  • MicroRNAs (miRNAs) are crucial regulators of gene expression, influencing numerous biological processes.
  • Altered miRNA profiles are observed in multiple sclerosis (MS) patients' blood cells and lesions.
  • Specific miRNAs are implicated in the immune responses and myelin sheath maintenance relevant to MS.

Purpose of the Study:

  • To discuss the potential role of miRNAs in the pathogenesis of multiple sclerosis (MS).
  • To explore how dysregulated miRNAs contribute to MS pathology, including immune cell involvement and myelin damage.
  • To highlight the potential of miRNAs as therapeutic targets and biomarkers for MS.

Main Methods:

  • Review of recent studies on miRNA expression in multiple sclerosis.
  • Analysis of miRNA profiles in blood cells and MS lesions.
  • Discussion of the functional roles of specific miRNAs (e.g., miRNA-326, miRNA-219) in immune cells and oligodendrocytes.

Main Results:

  • Distinct miRNA expression patterns exist in active versus inactive MS lesions.
  • Dysregulated miRNAs in MS lesions are linked to astrocytes and immune cells, potentially affecting macrophage activity via CD47.
  • Increased miRNA-326 in blood during relapses correlates with T helper 17 cell differentiation and is found in active MS lesions.
  • miRNAs are essential for myelin sheath maintenance; their absence causes axonal damage.
  • miRNA-219 and others promote oligodendrocyte differentiation.

Conclusions:

  • MicroRNAs are significantly implicated in multiple sclerosis pathogenesis.
  • Dysregulation of specific miRNAs contributes to immune dysregulation and myelin damage in MS.
  • Further understanding of miRNA involvement may reveal novel therapeutic strategies and diagnostic biomarkers for MS.

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