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FoxP3 mRNA splice forms in synovial CD4+ T cells in rheumatoid arthritis and psoriatic arthritis

L Rebekka Ryder1, Else Marie Bartels, Anders Woetmann

  • 1The Parker Institute, Frederiksberg Hospital, Denmark.

APMIS : Acta Pathologica, Microbiologica, Et Immunologica Scandinavica
|April 21, 2012
PubMed

Insights

Researchers studied FoxP3 mRNA splice variants in CD4+ T cells from rheumatoid arthritis (RA) and psoriatic arthritis (PsA) patients. Increased FoxP3 mRNA was found in peripheral and synovial fluid, suggesting unique T cell subsets in the joints.

Area of Science:

  • Immunology
  • Molecular Biology
  • Rheumatology

Background:

  • Rheumatoid arthritis (RA) and psoriatic arthritis (PsA) are inflammatory conditions involving immune system dysregulation.
  • Regulatory T cells (Tregs), characterized by FoxP3 expression, play a crucial role in immune homeostasis.
  • Understanding FoxP3 splice variants in different disease contexts is essential for elucidating Treg function.

Purpose of the Study:

  • To compare the expression levels of distinct FoxP3 mRNA splice forms in CD4+ T cells from peripheral blood (PB) and synovial fluid (SF).
  • To investigate these expression patterns in patients with RA and PsA compared to healthy controls.

Main Methods:

  • Quantitative real-time PCR was employed to measure FoxP3 mRNA splice variants.
  • CD4+ T cells were isolated from paired PB and SF samples of RA and PsA patients, and from PB of healthy controls.

Main Results:

  • FoxP3fl and FoxP3Δ2 mRNA levels were significantly elevated in PB CD4+ T cells of RA patients compared to controls.
  • SF CD4+ T cells showed increased FoxP3fl and Δ2 mRNA in sero-negative RA and PsA, but not sero-positive RA.
  • FoxP3Δ2Δ7 mRNA was minimally detected in patient samples and absent in healthy individuals.

Conclusions:

  • Synovial CD4+ T cells in RA patients exhibit increased expression of FoxP3 splice forms.
  • A distinct, high FoxP3 expression profile in sero-negative RA and PsA suggests unique, locally induced or recruited synovial T cell subsets.
  • These findings highlight potential differences in immune cell populations within the joints of specific patient groups.

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