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Microchimerism and systemic sclerosis.

C Scaletti1, A Vultaggio, E Maggi

  • 1Department of Internal Medicine, Section of Immunoallergology and Respiratory Disease, University of Florence, Italy. scalettic@lycosmail.com

International Archives of Allergy and Immunology
|August 8, 2001
PubMed
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Systemic sclerosis (SSc) involves immune system activation and fibrosis. Research suggests SSc may be a form of chronic graft versus host disease (cGVHD) due to microchimeric T cells reacting with maternal antigens.

Area of Science:

  • Immunology
  • Rheumatology
  • Pathogenesis of Autoimmune Diseases

Background:

  • Systemic sclerosis (SSc) is an autoimmune connective tissue disease marked by fibrosis.
  • SSc involves immunological abnormalities, including autoantibodies and activated T cells, particularly CD4+ cells.
  • A predominant activation of IL-4-producing Th2-like T cells is observed in SSc patients.

Purpose of the Study:

  • To explore the pathogenetic similarities between Systemic Sclerosis (SSc) and chronic graft versus host disease (cGVHD).
  • To investigate the role of microchimeric T cells in SSc pathogenesis.
  • To support the hypothesis that SSc is a type of cGVHD.

Main Methods:

  • Analysis of T cell populations and cytokine profiles in SSc patients.

Related Experiment Videos

  • Comparison of immunological and clinical features of SSc with cGVHD.
  • Investigation of microchimeric T cell activity in SSc, including reactions with maternal MHC antigens.

    • Main Results:

    • SSc patients exhibit a predominant activation of Th2-like T cells, producing IL-4.
    • T cells in both SSc and cGVHD tissues are abundant and produce Th2-like cytokines.
    • Microchimeric T cells in SSc react with maternal MHC antigens and produce Th2 cytokines, mirroring cGVHD characteristics.

    Conclusions:

    • Systemic sclerosis shares significant pathogenetic similarities with chronic graft versus host disease.
    • The findings support the hypothesis that SSc may arise from transplacental cell transfer, similar to cGVHD.
    • Microchimeric T cell activity against maternal antigens is a key feature linking SSc and cGVHD.