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The expression of SOCS is altered in rheumatoid arthritis

P Isomäki1, T Alanärä, P Isohanni

  • 1Department of Molecular Immunology, Institute of Medical Technology, Biokatu 8, 33014 Tampere University, Tampere, Finland. pia.isomaki@uta.fi

Rheumatology (Oxford, England)
|August 30, 2007
PubMed
Abstract

Insights

Suppressors of cytokine signalling (SOCS) protein expression is altered in rheumatoid arthritis (RA) patients. SOCS levels vary by cell type and location, impacting cellular responses to cytokines in RA.

Area of Science:

  • Immunology
  • Molecular Biology
  • Rheumatology

Background:

  • Cytokines are key drivers of rheumatoid arthritis (RA) pathogenesis.
  • The JAK-STAT pathway, crucial for cytokine signaling, is regulated by suppressors of cytokine signalling (SOCS) proteins.
  • SOCS protein levels significantly influence cellular responses to cytokines.

Purpose of the Study:

  • To investigate the expression patterns of SOCS proteins in chronic RA.
  • To determine if SOCS expression differs between RA patients and healthy individuals.
  • To explore cell-type and compartment-specific differences in SOCS expression within RA.

Main Methods:

  • Quantitative reverse transcriptase polymerase chain reaction (RT-PCR) was used to measure SOCS1-3 and CIS1 mRNA levels.
  • Peripheral blood (PB) and synovial fluid (SF) mononuclear cells, including purified T cells and monocytes, were analyzed.
  • Immunohistochemistry was employed to examine SOCS mRNA and protein expression in synovial tissues.

Main Results:

  • SOCS1 and SOCS3 mRNA levels were significantly elevated in PBMCs of RA patients compared to healthy volunteers.
  • Up-regulation of SOCS1 was observed in PB T cells, while SOCS3 was up-regulated in PB monocytes.
  • SF T cells showed lower SOCS expression, whereas SF macrophages exhibited higher levels compared to their PB counterparts. SOCS1 was also elevated in RA synovial membranes versus osteoarthritis.

Conclusions:

  • SOCS expression profiles are significantly altered in rheumatoid arthritis.
  • The observed changes in SOCS expression are dependent on specific cell types.
  • Cellular compartment (e.g., peripheral blood vs. synovial fluid) also dictates SOCS expression patterns in RA.

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