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Related Experiment Video

Updated: Nov 22, 2025

Isolating Human Peripheral Blood Mononuclear Cells and CD4+ T cells from Sézary Syndrome Patients for Transcriptomic Profiling
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Lymphocyte subset abnormalities in early diffuse cutaneous systemic sclerosis.

David A Fox1, Steven K Lundy2, Michael L Whitfield3

  • 1Division of Rheumatology, Department of Internal Medicine, Scleroderma Program, Clinical Autoimmunity Center of Excellence, University of Michigan, Ann Arbor, MI, USA. dfox@umich.edu.

Arthritis Research & Therapy
|January 7, 2021
PubMed
Summary
This summary is machine-generated.

Systemic sclerosis (SSc) patients show altered T cell populations, including an expansion of CD4+CD319+ cells, which may drive disease pathogenesis. These immune cell abnormalities offer potential biomarkers for SSc sub-classification and targeted therapies.

Keywords:
AutoimmunityCD319CD4 T cellsInterleukinSystemic sclerosis

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Area of Science:

  • Immunology
  • Rheumatology
  • Cell Biology

Background:

  • Systemic sclerosis (SSc) exhibits variable lymphocyte abnormalities, often confounded by disease heterogeneity and immunosuppressive treatments.
  • Previous studies lacked homogeneity in patient populations regarding disease duration, severity, and treatment status.

Purpose of the Study:

  • To investigate immune cell parameter differences in a homogeneous group of early diffuse cutaneous SSc patients.
  • To identify potential biomarkers for SSc pathogenesis and targeted treatment strategies.

Main Methods:

  • Multi-parameter flow cytometry was used to enumerate lymphocyte subsets in peripheral blood mononuclear cells.
  • Intracellular cytokine production (IL-4, IL-17) was measured post-T cell activation.

Main Results:

  • SSc patients displayed increased CD4+ T cells and decreased CD8+ T cells compared to controls.
  • A significant expansion of CD4+CD319+ T cells, which are cytotoxic and cytokine-producing, was observed in SSc.
  • Increased IL-17 production was noted in SSc patients, while IL-4 levels remained similar.

Conclusions:

  • Specific immune cell abnormalities, particularly CD4+CD319+ T cells, are identified in early SSc and may contribute to disease pathogenesis.
  • These identified immune cell populations represent potential biomarkers for SSc sub-classification and novel therapeutic targets.