Cited by 526TGF-β signaling in diseasesBone Metabolism and DiseasesDevelopmental Biology and Gene Regulation

TGF‐β‐induced repression of CBFA1 by Smad3 decreases cbfa1 and osteocalcin expression and inhibits osteoblast differentiation

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Alliston, Tamara, Choy, Lisa, Ducy, Patricia, Karsenty, Gérard, Derynck, Rik·2001·The EMBO Journal

Abstract

Transforming growth factor-beta (TGF-beta), a secreted factor present at high levels in bone, inhibits osteoblast differentiation in culture; yet, the mechanism of this inhibition remains unclear. We studied the effects of TGF-beta and its effectors, the Smads, on the expression and function of the osteoblast transcription factor CBFA1. TGF-beta inhibited the expression of the cbfa1 and osteocalcin genes, whose expression is controlled by CBFA1 in osteoblast-like cell lines. This inhibition was mediated by Smad3, which interacts physically with CBFA1 and represses its transcriptional activity at the CBFA1-binding OSE2 promoter sequence. The repression of CBFA1 function by Smad3 contrasts with previous observations that Smads function as transcription activators. This repression occurred in mesenchymal but not epithelial cells, and depended on the promoter sequence. Smad3-mediated repression of CBFA1 provides a central regulatory mechanism for the inhibition of osteoblast differentiation by TGF-beta, since it inhibits both cbfa1 transcription and transcriptional activation of osteoblast differentiation genes by CBFA1. Altering Smad3 signaling influenced osteoblast differentiation in the presence or absence of TGF-beta, implicating Smad3/TGF-beta-mediated repression in autocrine regulation of osteoblast differentiation.

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  1. Ausubel,F.M., Brent,R., Kingston,R.E., Moore,D.D., Seidman,J.G., Smith,J.A. and Struhl,K. (1994) Current Protocols in Molecular Biology. John Wiley & Sons, New York, NY.

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Authors
Alliston, T., Choy, L., Ducy, P., Karsenty, G., & Derynck, R.
Affiliations
  • University of California, San Francisco (US)
  • Baylor College of Medicine (US)
Corresponding author
Derynck, Rik
Venue
The EMBO Journal
Published
2001-05-01
Volume
20
Issue
9
Pages
2254-2272
ISSN
  • 0261-4189 (ISSN-L)
  • 1460-2075
OpenAlex
W2042839797
Cited by
526
References
92
Citations by year
2026: 9 · 2025: 10 · 2024: 14 · 2023: 15 · 2022: 11 · 2021: 17 · 2020: 18 · 2019: 13 · 2018: 26 · 2017: 19 · 2016: 25 · 2015: 19 · 2014: 20 · 2013: 29 · 2012: 31
FWCI
9.28
Type
journal article
Language
en
Open access
Locations
  • The EMBO Journal (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • American Heart Association
  • Arthritis Foundation
  • National Institutes of Health
  • National Cancer Institute (R01CA063101)
  • National Institute of Arthritis and Musculoskeletal and Skin Diseases (AR 45548, R01AR045548)
  • National Institute of Dental and Craniofacial Research (P60DE013058)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › TGF-β signaling in diseases
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Bone Metabolism and Diseases
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Developmental Biology and Gene Regulation
Keywords
TGF-beta, Smad3, Runx2, osteocalcin, osteogenic differentiation, transcriptional repression, autocrine regulation, mesenchymal cells, transcription factor interaction
MeSH terms
Animals, Cell Differentiation, Cells, Cultured, DNA, DNA-Binding Proteins, Epithelial Cells, Humans, Mesoderm, Neoplasm Proteins, Osteoblasts, Promoter Regions, Genetic, Protein Binding, Transcription Factors, Transcription, Genetic, Transcriptional Activation, Trans-Activators, Osteocalcin, Gene Expression, Transforming Growth Factor beta, Core Binding Factor Alpha 1 Subunit, Mice, Rats, Smad2 Protein, Smad3 Protein

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