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Interference with Sin3 function induces epigenetic reprogramming and differentiation in breast cancer cells.

Farias, Eduardo F, Petrie, Kevin, Leibovitch, Boris, Murtagh, Janice, Chornet, Manuel Boix, Schenk, Tino, Zelent, Arthur and Waxman, Samuel (2010) Interference with Sin3 function induces epigenetic reprogramming and differentiation in breast cancer cells. Proceedings of the National Academy of Sciences of the United States of America, 107 (26). pp. 11811-6. ISSN 1091-6490

Item Type: Article

Abstract

Sin3A/B is a master transcriptional scaffold and corepressor that plays an essential role in the regulation of gene transcription and maintenance of chromatin structure, and its inappropriate recruitment has been associated with aberrant gene silencing in cancer. Sin3A/B are highly related, large, multidomian proteins that interact with a wide variety of transcription factors and corepressor components, and we examined whether disruption of the function of a specific domain could lead to epigenetic reprogramming and derepression of specific subsets of genes. To this end, we selected the Sin3A/B-paired amphipathic alpha-helices (PAH2) domain based on its established role in mediating the effects of a relatively small number of transcription factors containing a PAH2-binding motif known as the Sin3 interaction domain (SID). Here, we show that in both human and mouse breast cancer cells, the targeted disruption of Sin3 function by introduction of a SID decoy that interferes with PAH2 binding to SID-containing partner proteins reverted the silencing of genes involved in cell growth and differentiation. In particular, the SID decoy led to epigenetic reprogramming and reexpression of the important breast cancer-associated silenced genes encoding E-cadherin, estrogen receptor alpha, and retinoic acid receptor beta and impaired tumor growth in vivo. Interestingly, the SID decoy was effective in the triple-negative M.D. Anderson-Metastatic Breast-231 (MDA-MB-231) breast cancer cell line, restoring sensitivity to 17beta-estradiol, tamoxifen, and retinoids. Therefore, the development of small molecules that can block interactions between PAH2 and SID-containing proteins offers a targeted epigenetic approach for treating this type of breast cancer that may also have wider therapeutic implications.

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More Information

Depositing User: Kevin Petrie

Identifiers

Item ID: 12433
ISSN: 1091-6490
URI: http://sure.sunderland.ac.uk/id/eprint/12433
Official URL: https://www.pnas.org/content/107/26/11811

Users with ORCIDS

ORCID for Kevin Petrie: ORCID iD orcid.org/0000-0002-9805-9152

Catalogue record

Date Deposited: 18 Aug 2020 17:58
Last Modified: 30 Sep 2020 10:48

Contributors

Author: Kevin Petrie ORCID iD
Author: Eduardo F Farias
Author: Boris Leibovitch
Author: Janice Murtagh
Author: Manuel Boix Chornet
Author: Tino Schenk
Author: Arthur Zelent
Author: Samuel Waxman

University Divisions

Faculty of Health Sciences and Wellbeing > School of Medicine

Subjects

Sciences > Biomedical Sciences
Sciences > Health Sciences

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