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Scleroderma fibroblasts constitutively express the long pentraxin PTX3
M M Luchetti1, P Sambo, P Majlingová
1Istituto di Clinica Medica Generale, Ematologia ed Immunologia Clinica, Univer- sità Politecnica delle Marche, Ancona, Italy.
Clinical and Experimental Rheumatology
|September 4, 2004
Summary
Pentaxin-3 (PTX3) is constitutively expressed in scleroderma fibroblasts, unlike normal cells which require inflammatory cytokines for PTX3 induction. This suggests PTX3 is a key marker of activated scleroderma fibroblasts.
Area of Science:
- Immunology
- Cell Biology
- Rheumatology
Background:
- Pentaxin-3 (PTX3) is a soluble pattern recognition molecule with a unique structure.
- PTX3 expression is induced by inflammatory cytokines like IL-1beta and TNF-alpha, but not IL-6.
- Scleroderma is a connective tissue disease characterized by fibroblast activation and extracellular matrix deposition.
Purpose of the Study:
- To investigate the expression of PTX3 in normal and scleroderma fibroblasts.
- To determine the role of inflammatory cytokines in PTX3 expression in these cells.
Main Methods:
- Fibroblast cultures (normal and scleroderma) were treated with inflammatory cytokines.
- PTX3 mRNA levels were assessed using Northern analysis.
- PTX3 protein concentrations in culture supernatants were quantified via ELISA.
Main Results:
- Normal fibroblasts showed increased PTX3 mRNA upon stimulation with IL-1beta and TNF-alpha.
- Scleroderma fibroblasts exhibited high, constitutive PTX3 expression without stimulation.
- IFN-gamma and TGF-beta inhibited constitutive PTX3 expression in scleroderma fibroblasts.
Conclusions:
- Constitutive PTX3 expression is a characteristic feature of activated scleroderma fibroblasts.
- PTX3 may serve as a biomarker for fibroblast activation in systemic sclerosis.