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Modulation of IFNAR1 mRNA expression in multiple sclerosis patients

Federico Serana1, Alessandra Sottini, Claudia Ghidini

  • 1Laboratorio di Biotecnologie, Diagnostic Department, Spedali Civili di Brescia, p.le Spedali Civili 1, 25123, Brescia, Italy.

Journal of Neuroimmunology
|May 17, 2008
PubMed

Insights

Interferon-beta receptor 1 (IFNAR1) mRNA levels are lower in multiple sclerosis patients treated with interferon-beta. However, IFNAR1 mRNA increases in patients responding to treatment, suggesting a compensatory mechanism for receptor loss.

Area of Science:

  • Immunology
  • Neuroscience
  • Molecular Biology

Background:

  • The interferon-beta receptor (IFNAR) comprises IFNAR1 and IFNAR2 subunits.
  • IFNAR2 exists in functional (IFNAR2.2), non-functional (IFNAR2.1), and soluble (IFNAR2.3) isoforms.

Purpose of the Study:

  • To investigate interferon-beta receptor (IFNAR) component mRNA levels in multiple sclerosis (MS) patients.
  • To determine if IFNAR1 mRNA levels correlate with interferon-beta (IFN-β) bioactivity in MS patients.

Main Methods:

  • Real-Time PCR analysis of mRNA for IFNAR components.
  • Analysis of patients naive for therapy and those undergoing long-term IFN-β treatment.
  • Stratification of treated patients based on Myxovirus protein-A mRNA production (a marker of IFN-β bioactivity).

Main Results:

  • IFNAR1 mRNA levels were lower in MS patients treated with IFN-β compared to healthy controls.
  • IFNAR1 mRNA levels in treated patients approached control values only in those producing Myxovirus protein-A.
  • Chronic IFN-β stimulation can lead to IFNAR protein downregulation.

Conclusions:

  • The observed increase in IFNAR1 mRNA in responsive patients may counteract IFNAR protein downregulation.
  • This upregulation could enhance cell responsiveness to interferon-beta in a subset of multiple sclerosis patients.
  • IFNAR1 mRNA levels may serve as a biomarker for treatment response in MS.

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