Cited by 127Histone Deacetylase Inhibitors ResearchGenomics and Chromatin DynamicsEpigenetics and DNA Methylation

HDAC7 regulates histone 3 lysine 27 acetylation and transcriptional activity at super-enhancer-associated genes in breast cancer stem cells

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Caslini, Corrado, Hong, Sunhwa, Ban, Yuguang J., Chen, Xi S., Ince, Tan A.·2019·Oncogene

Abstract

Chromatin regulation through histone modifications plays an essential role in coordinated expression of multiple genes. Alterations in chromatin induced by histone modifiers and readers regulate critical transcriptional programs involved in both normal development and tumor differentiation. Recently, we identified that histone deacetylases HDAC1 and HDAC7 are necessary to maintain cancer stem cells (CSCs) in both breast and ovarian tumors. Here, we sought to investigate the CSC-specific function of HDAC1 and HDAC7 mechanistically by using a stem-like breast cancer (BrCa) cell model BPLER and matched nonstem tumor cell (nsTC)-like HMLER, along with conventional BrCa cell lines with different CSC enrichment levels. We found that HDAC1 and HDAC3 inhibition or knockdown results in HDAC7 downregulation, which is associated with a decrease in histone 3 lysine 27 acetylation (H3K27ac) at transcription start sites (TSS) and super-enhancers (SEs) prominently in stem-like BrCa cells. Importantly, these changes in chromatin landscape also correlate with the repression of many SE-associated oncogenes, including c-MYC, CD44, CDKN1B, SLUG, VDR, SMAD3, VEGFA, and XBP1. In stem-like BrCa cells, HDAC7 binds near TSS and to SEs of these oncogenes where it appears to contribute to both H3K27ac and transcriptional regulation. These results suggest that HDAC7 inactivation, directly or through inhibition of HDAC1 and HDAC3, can result in the inhibition of the CSC phenotype by downregulating multiple SE-associated oncogenes. The CSC selective nature of this mechanism and the prospect of inhibiting multiple oncogenes simultaneously makes development of HDAC7 specific inhibitors a compelling objective.

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Authors
Caslini, C., Hong, S., Ban, Y. J., Chen, X. S., & Ince, T. A.
Affiliations
University of Miami (US)
Corresponding author
  • Caslini, Corrado
  • Ince, Tan A.
Venue
Oncogene
Published
2019-08-02
Volume
38
Issue
39
Pages
6599-6614
ISSN
  • 0950-9232 (ISSN-L)
  • 1476-5594
OpenAlex
W2966048051
Cited by
121
References
45
Citations by year
2026: 9 · 2025: 17 · 2024: 19 · 2023: 25 · 2022: 18 · 2021: 21 · 2020: 11
FWCI
4.22
Type
journal article
Language
en
Open access
Locations
  • Oncogene (publishedVersion, cc-by)
  • PubMed (publishedVersion)
Funders
  • Breast Cancer Research Foundation
  • Florida Breast Cancer Foundation
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Histone Deacetylase Inhibitors Research
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Genomics and Chromatin Dynamics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Epigenetics and DNA Methylation
Keywords
HDAC7, HDAC1, HDAC3, histone deacetylase, super-enhancers, breast cancer stem cells, transcriptional regulation, chromatin regulation, transcription start sites, histone deacetylase inhibitors, breast cancer
MeSH terms
Histone Deacetylase 3, Acetylation, Benzamides, Breast Neoplasms, Enhancer Elements, Genetic, Female, Histone Deacetylases, Histones, Humans, Lysine, Pyridines, Transcription Factors, Transcription, Genetic, Neoplastic Stem Cells, Down-Regulation, Gene Knockdown Techniques, Histone Deacetylase 1, Histone Deacetylase Inhibitors

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