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Biological Chemistry

Editor-in-Chief: Brüne, Bernhard

Editorial Board: Buchner, Johannes / Lei, Ming / Ludwig, Stephan / Thomas, Douglas D. / Turk, Boris / Wittinghofer, Alfred

IMPACT FACTOR 2017: 3.022

CiteScore 2017: 2.81

SCImago Journal Rank (SJR) 2017: 1.562
Source Normalized Impact per Paper (SNIP) 2017: 0.705

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Volume 383, Issue 12


Transcription Factor Egr-1 Activates Collagen Expression in Immortalized Fibroblasts or Fibrosarcoma Cells

D. Alexander / M. Judex / R. Meyringer / M. Weis-Klemm / S. Gay / U. Müller-Ladner / W.K. Aicher
Published Online: 2005-06-01 | DOI: https://doi.org/10.1515/BC.2002.208


Synovial fibroblasts from rheumatoid arthritis patients express elevated levels of the transcription factor Egr 1. The metabolic consequences of Egr-1 overexpression in fibroblasts are not known in detail. Therefore we searched for gene products that are differentially expressed in Egr-1high versus Egr-1low fibroblasts. Immortalized synovial fibroblasts were transfected with two different Egr-1 expression vectors. Expression of recombinant Egr-1 was confirmed by RTPCR and immunoblots. Random arbitrarily primed PCR revealed that Egr-1 induces enhanced transcription levels of the α1 chain of type I collagen. Increased expression of the α2 (I) chain could also be observed. We found enhanced levels of type I collagen propeptide in supernatants and stronger signals of α2 (I) protein in extracts of the Egr 1high expressing clone versus controls. Additionally, Egr-1 was transiently expressed in fibrosarcoma cells. These cells showed a pronounced elevation of type I collagen (α1) transcripts as well. Moreover, we could demonstrate that Egr-1 induces transcription of other genes including type II collagen (α1) and plateledderived growth factor β1. These data suggest that upregulation of Egr-1 might contribute to fibrosis observed in rheumatoid arthritis synovium by activation of genes encoding the α1 and α2 chains of type I collagen.

About the article

Published Online: 2005-06-01

Published in Print: 2002-12-09

Citation Information: Biological Chemistry, Volume 383, Issue 12, Pages 1845–1853, ISSN (Print) 1431-6730, DOI: https://doi.org/10.1515/BC.2002.208.

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