Coordinate overexpression of interferon-α-induced genes in systemic lupus erythematosus

Kyriakos A. Kirou, Christina Lee, Sandhya George, Kyriakos Louca, Ioannis G. Papagiannis, Margaret G.E. Peterson, Ngoc Ly, Robert N. Woodward, Kirk E. Fry, Anna Yin Har Lau, James G. Prentice, Jay G. Wohlgemuth, Mary K. Crow*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

360 Scopus citations

Abstract

Objective. To study the contribution of interferon-α (IFNα) and IFNγ to the IFN gene expression signature that has been observed in microarray screens of peripheral blood mononuclear cells (PBMCs) from patients with systemic lupus erythematosus (SLE). Methods. Quantitative real-time polymerase chain reaction analysis of healthy control PBMCs was used to determine the relative induction of a panel of IFN-inducible genes (IFIGs) by IFNα and IFNγ. PBMCs from 77 SLE patients were compared with those from 22 disease controls and 28 healthy donors for expression of IFIGs. Results. Expression of IFNα-inducible genes was significantly higher in SLE PBMCs than in those from disease controls or healthy donors. The level of expression of all IFIGs in PBMCs from SLE patients with IFNα pathway activation correlated highly with the inherent responsiveness of those genes to IFNα, suggesting coordinate activation of that cytokine pathway. Expression of genes preferentially induced by IFNγ was not significantly increased in SLE PBMCs compared with control PBMCs. IFNα-regulated gene-inducing activity was detected in some SLE plasma samples. Conclusion. The coordinate activation of IFNα-induced genes is a characteristic of PBMCs from many SLE patients, supporting the hypothesis that IFNα is the predominant stimulus for IFIG expression in lupus.

Original languageEnglish (US)
Pages (from-to)3958-3967
Number of pages10
JournalArthritis and rheumatism
Volume50
Issue number12
DOIs
StatePublished - Dec 2004

ASJC Scopus subject areas

  • Pharmacology (medical)
  • Immunology and Allergy
  • Rheumatology
  • Immunology

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