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Connective tissue metabolism including cytokines in scleroderma
1Genentech, Inc., South San Francisco, California.
Current Opinion in Rheumatology
|December 1, 1991
Summary
Scleroderma skin fibroblasts show significant heterogeneity in collagen production and altered expression of key growth factors and their receptors. These findings highlight cellular interactions and altered cytokine patterns in scleroderma pathogenesis.
Area of Science:
- Dermatology
- Cell Biology
- Immunology
Background:
- Scleroderma is characterized by fibroblast heterogeneity in collagen, cytokine, and cytokine receptor expression.
- Understanding these cellular differences is crucial for elucidating disease mechanisms.
Purpose of the Study:
- To investigate the phenotypic heterogeneity of fibroblasts in scleroderma skin.
- To analyze the expression of collagens, cytokines, and growth factor receptors in scleroderma fibroblasts.
Main Methods:
- In situ hybridization to detect collagen VI expression.
- Flow cytometry for fibroblast sorting and analysis.
- Northern analysis for transforming growth factor-beta 1 transcripts.
- Immunohistochemical staining for platelet-derived growth factor-beta receptors.
Main Results:
- A subpopulation of fibroblasts expressing type VI collagen is increased in scleroderma skin.
- Transforming growth factor-beta 2 is overexpressed in scleroderma skin.
- Elevated osteonectin (SPARC) mRNA and altered epidermal growth factor receptor affinity observed in scleroderma fibroblasts.
- Platelet-derived growth factor-beta receptors are present in scleroderma skin but absent in normal skin.
Conclusions:
- Scleroderma fibroblasts exhibit significant phenotypic heterogeneity.
- Altered cytokine patterns and cell responsiveness, including growth factor receptor changes, are implicated in scleroderma pathogenesis.
- Interactions between cell types play a critical role in the disease.