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Type 2 helper T-cell predominance and high CD30 expression in systemic sclerosis
C Mavalia1, C Scaletti, P Romagnani
1Institute of Internal Medicine and Immunoallergology, University of Florence, Italy.
The American Journal of Pathology
|December 24, 1997
Summary
Patients with progressive systemic sclerosis exhibit a dominant type 2 helper (Th2) T-cell response in the skin, characterized by elevated interleukin-4. This Th2 activation may drive key disease features like fibrosis and autoantibody production.
Area of Science:
- Immunology
- Rheumatology
- Dermatology
Background:
- Progressive systemic sclerosis (PSS) is an autoimmune disease characterized by inflammation, fibrosis, and vascular damage.
- The role of T-helper cell subsets in the pathogenesis of PSS remains incompletely understood.
Purpose of the Study:
- To investigate the cytokine production profile of T cells infiltrating the skin in patients with PSS.
- To determine the association between T-cell activation markers and disease severity.
Main Methods:
- Generation and cytokine analysis of CD4+ T-cell clones from skin biopsies.
- In situ hybridization for cytokine mRNA expression in skin infiltrates.
- Immunohistochemical analysis for CD30 expression on T cells.
- Serum soluble CD30 level measurement.
Main Results:
- Most CD4+ T-cell clones displayed a type 2 helper (Th2) cytokine profile, producing interleukin-4 (IL-4) but minimal interferon-gamma (IFN-γ).
- High IL-4 and low IFN-γ mRNA expression were observed in skin perivascular infiltrates.
- Numerous CD4+ T cells in skin specimens expressed CD30.
- Elevated serum soluble CD30 levels were found in most patients with diffuse PSS.
Conclusions:
- A predominant Th2-like T-cell activation exists in the skin of patients with progressive systemic sclerosis.
- This Th2 skew may contribute to the characteristic endothelial cell injury, fibrosis, and autoantibody production in PSS.