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Biological Chemistry

Editor-in-Chief: Brüne, Bernhard

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

12 Issues per year

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 385, Issue 7


SMAD-signaling in chronic obstructive pulmonary disease: transcriptional down-regulation of inhibitory SMAD 6 and 7 by cigarette smoke

J. Springer / F.R. Scholz / C. Peiser / D.A. Groneberg / A. Fischer
Published Online: 2005-06-01 | DOI: https://doi.org/10.1515/BC.2004.080


Transforming growth factor-β1 is a potent mediator of fibrosis stimulating the secretion of extracellular matrix proteins and is involved in airway remodeling in chronic obstructive pulmonary disease (COPD). Signals from the TGF superfamily are mediated by the SMAD group of transcription factors. Here, the expression of the regulatory SMAD2, 3, the co-SMAD4 and the inhibitory SMAD6 and 7 was assessed in bronchial biopsies of COPD patients and controls by quantitative RTPCR. While SMAD2 was not expressed and SMAD3 and 4 displayed no change, the inhibitory SMAD6 and 7 were significantly downregulated in COPD. To reveal the molecular basis of tobacco smoke-induced airway remodeling and to test whether it may interfere with intracellular SMAD signaling, the airway epithelial cell line A549 was incubated with cigarette smoke extract (1% and 10%) for 48 hours, which led to down-regulation of SMAD6 and 7 at both concentrations tested. It can be concluded that TGF-β-mediated effects in COPD are influenced by a disturbed intracellular feedback mechanism of inhibitory SMADs. Also, the effects of non-volatile components in tobacco smoke may partly be regulated via a smoke-induced down-regulation of inhibitory SMADs.

About the article

Published Online: 2005-06-01

Published in Print: 2004-07-05

Citation Information: Biological Chemistry, Volume 385, Issue 7, Pages 649–653, ISSN (Online) 1437-4315, ISSN (Print) 1431-6730, DOI: https://doi.org/10.1515/BC.2004.080.

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