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Systemic and cell type-specific gene expression patterns in scleroderma skin.

Michael L Whitfield¹, Deborah R Finlay, John Isaac Murray

¹Department of Dermatology, University of California-San Francisco, San Francisco, CA 94143, USA.

Proceedings of the National Academy of Sciences of the United States of America

|October 8, 2003

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Systemic sclerosis (diffuse scleroderma) alters gene expression in skin, affecting multiple cell types like B lymphocytes and fibroblasts. These findings suggest potential diagnostic markers for this complex autoimmune disease.

Area of Science:

Immunology
Genomics
Dermatology

Background:

Systemic sclerosis is an autoimmune disease characterized by fibrosis.
Gene expression patterns in scleroderma skin are not fully understood.

Purpose of the Study:

To analyze gene expression profiles in skin biopsies from patients with diffuse systemic sclerosis.
To identify differentially expressed genes and cell types involved in scleroderma pathogenesis.

Main Methods:

DNA microarrays were used to assess gene expression of over 12,000 human genes.
Skin biopsies from scleroderma patients and healthy controls were analyzed.
Immunohistochemistry was performed to analyze lymphocyte populations.

Main Results:

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Distinct gene expression patterns were observed between scleroderma and normal skin.
Clinically affected and unaffected scleroderma tissues showed similar gene expression profiles.
Differential expression of genes in endothelial cells, B lymphocytes (CD20+), and fibroblasts was identified.

Conclusions:

Systemic sclerosis affects multiple cell types in the skin, indicating systemic involvement.
Identified genes may serve as potential biomarkers for diagnosing and understanding scleroderma.