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Imbalance of CD4+ lymphocyte subsets in patients with mixed connective tissue disease

H Becker1, A Langrock, K Federlin

  • 1III. Medizinische Klinik und Poliklinik, Universität Giessen, Germany.

Clinical and Experimental Immunology
|April 1, 1992
PubMed

Insights

Patients with mixed connective tissue disease (MCTD) show altered CD4+ T lymphocyte subsets. Specifically, CD4+CD45RA+ cells increase while CD4+CD29+ cells decrease, suggesting potential immune dysregulation in MCTD.

Area of Science:

  • Immunology
  • Rheumatology
  • Cell Biology

Background:

  • Mixed connective tissue disease (MCTD) is an autoimmune disorder with features of other connective tissue diseases.
  • CD4+ T lymphocytes play a crucial role in immune regulation.
  • Alterations in T lymphocyte subsets may contribute to the pathogenesis of autoimmune diseases.

Purpose of the Study:

  • To investigate the proportions of specific CD4+ T lymphocyte subsets in patients with MCTD.
  • To compare these subsets with those in healthy controls and patients with progressive systemic sclerosis.
  • To explore the activation and phenotype acquisition of CD4+ T cells in MCTD.

Main Methods:

  • Double-labeling immunofluorescence was used to analyze peripheral blood samples.
  • Flow cytometry was employed to quantify CD4+CD45RA+ and CD4+CD29+ T cells.
  • Phytohaemagglutinin stimulation was used to assess T cell activation and phenotype changes.

Main Results:

  • Patients with MCTD exhibited a significantly higher proportion of CD4+CD45RA+ cells compared to controls (P<0.01).
  • A marked decrease in CD4+CD29+ cells was observed in MCTD patients (P<0.001).
  • CD4+CD29+ cells were lower in MCTD than in patients with progressive systemic sclerosis; MCTD CD4+ cells showed enhanced CD29+ phenotype acquisition upon stimulation.

Conclusions:

  • MCTD is characterized by an imbalance in CD4+ T lymphocyte subsets, with increased naive (CD45RA+) and decreased memory/effector (CD29+) cells.
  • The enhanced in vivo responsiveness and potential tissue accumulation of CD4+CD29+ cells may lead to their depletion in peripheral blood.
  • These findings suggest a role for altered CD4+ T cell dynamics in the pathogenesis of MCTD.

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