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The steroid receptor co-activator-1 (SRC-1) potentiates TGF-β/Smad signaling: role of p300/CBP

Oncogene volume 24, pages 1936–1945 (2005)Cite this article

Abstract

The three related 160-kDa proteins, SRC-1, TIF-2 and RAC-3, were initially identified as factors interacting with nuclear receptors. They have also been reported to potentiate the activity of other transcription factors such as AP-1 or NF-κB. The aim of this work was to identify whether SRC-1 interferes with the TGF-β/Smad signaling pathway, and if so, to identify its underlying mechanisms of action. Using transient cell transfection experiments performed in human dermal fibroblasts with the Smad3/4-specific (SBE)4-lux reporter construct, as well as the human PAI-1 promoter, we determined that SRC-1 enhances TGF-β-induced, Smad-mediated, transcription. Likewise, SRC-1 overexpression potentiated TGF-β-induced upregulation of PAI-1 steady-state mRNA levels. Using a mammalian two-hybrid system, we demonstrated that SRC-1 interacts with the transcriptional co-activators p300/CBP, but not with Smad3. Overexpression of the adenovirus E1A oncoprotein, an inhibitor of CBP/p300 activity, prevented the enhancing effect of SRC-1 on Smad3/4-mediated transcription, indicating that p300/CBP may be required for SRC-1 effect. Such hypothesis was validated, as expression of a mutant form of SRC-1 lacking the CBP/p300-binding site failed to upregulate Smad3/4-dependent transcription, while full-length SRC-1 potentiated p300·Smad3 interactions. These results identify SRC-1 as a novel Smad3/4 transcriptional partner, facilitating the functional link between Smad3 and p300/CBP.

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Authors and Affiliations

  1. INSERM U697, Institut de recherche sur la peau, Hôpital Saint-Louis, Paris, France

    Sylviane Dennler, Valérie Pendaries, Charlotte Tacheau, Alain Mauviel & Franck Verrecchia

  2. Deparmento de Cs. Biologicas, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Argentina

    Monica A Costas

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  1. Sylviane Dennler
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Correspondence to Franck Verrecchia.

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Dennler, S., Pendaries, V., Tacheau, C. et al. The steroid receptor co-activator-1 (SRC-1) potentiates TGF-β/Smad signaling: role of p300/CBP. Oncogene 24, 1936–1945 (2005). https://doi.org/10.1038/sj.onc.1208343

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