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Matrix Contraction by Dermal Fibroblasts Requires Transforming Growth Factor-β/Activin-Linked Kinase 5, Heparan Sulfate-Containing Proteoglycans, and MEK/ERK : Insights into Pathological Scarring in Chronic Fibrotic Disease

Authors
  • Yunliang Chen
  • Xu Shi-wen
  • Jonathan van Beek
  • Laura Kennedy
  • Marilyn McLeod
  • Elisabetta A. Renzoni
  • George Bou-Gharios
  • Sarah Wilcox-Adelman
  • Paul F. Goetinck
  • Mark Eastwood
  • Carol M. Black
  • David J. Abraham
  • Andrew Leask
Publisher
American Society for Investigative Pathology
Publication Date
Dec 01, 2005
Source
PMC
Keywords
Disciplines
  • Biology
  • Medicine
License
Unknown

Abstract

Scarring is characterized by excessive synthesis and contraction of extracellular matrix. Here, we show that fibroblasts from scarred (lesional) areas of patients with the chronic fibrotic disorder diffuse scleroderma [diffuse systemic sclerosis (dSSc)] show an enhanced ability to adhere to and contract extracellular matrix, relative to fibroblasts from unscarred (nonlesional) areas of dSSc patients and dermal fibroblasts from normal, healthy individuals. The contractile abilities of normal and dSSc dermal fibroblasts were suppressed by blocking heparin sulfate-containing proteoglycan biosynthesis or antagonizing transforming growth factor-β receptor type I [activin-linked kinase (ALK5)] or ras/mitogen-activated protein kinase (MEK)/extracellular signal-regulated kinase (ERK). Compared with both normal and nonlesional fibroblasts, lesional dSSc fibroblasts overexpressed the heparin sulfate-containing proteoglycan syndecan 4. We also found that the procontractile signals from transforming growth factor (TGF)-β were integrated through syndecan 4 and MEK/ERK because the ability of TGFβ to induce contraction of dermal fibroblasts was prevented by MEK antagonism. TGFβ could not induce a contractile phenotype or phosphorylate ERK in syndecan 4−/− dermal fibroblasts. These results suggest that integrating TGFβ and ERK signals via syndecan 4 is essential for the contractile ability of dermal fibroblasts. We conclude that antagonizing MEK/ERK, TGFβ1/ALK5, or syndecan 4 may alleviate scarring in chronic fibrotic disease.

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