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Arch Dermatol. 1996 Jul;132(7):802-6.

Expression of interleukin-4 in scleroderma skin specimens and scleroderma fibroblast cultures. Potential role in fibrosis.

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  • 1Laboratoire de Recherche Biom├ędicale en Dermatologie, School of Medicine, University of Reims Champagne-Ardenne, France.

Abstract

BACKGROUND:

Scleroderma (systemic sclerosis) is a fibrotic disease characterized by an uncontrolled tissular accumulation of collagen. Several cytokines have been implicated in the fibroblast activation leading to fibrosis. For instance, we have previously demonstrated that interleukin-4 (IL-4) is a potent activator of collagen synthesis in fibroblast cultures. In this study, using immunocytochemical methods and in situ hybridization, we investigated the expression of IL-4 in normal and scleroderma skin and fibroblast cultures.

OBSERVATIONS:

Immunocytochemical studies with anti-IL-4 antibody were performed on biopsy specimens from 9 patients with normal skin and 11 patients with scleroderma. The label was intense or strong in 8 of the 11 scleroderma skin specimens, whereas it was negative or faint in 8 of the 9 normal skin specimens (P < .01). In situ hybridization demonstrated a significant increase of the number of IL-4 messenger RNA grains in scleroderma skin compared with normal skin (3.1 +/- 1.5 [mean +/- SD] vs 0.8 +/- 0.7; P < .001). A strongly positive labeling with the anti-IL-4 antibody was found in the 4 scleroderma fibroblast cultures, whereas it was negative in the 5 fibroblast control cultures (P < .05).

CONCLUSIONS:

Our results demonstrate that IL-4 is strongly expressed in the dermis of a large majority of patients with scleroderma and might be synthesized by scleroderma fibroblasts. We suggest that IL-4 is one of the cytokines implicated in the early steps of the fibrotic process.

PMID:
8678573
[PubMed - indexed for MEDLINE]
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