Cited by 1,870Protein Degradation and InhibitorsAcute Myeloid Leukemia ResearchChromatin Remodeling and Cancer

RNAi screen identifies Brd4 as a therapeutic target in acute myeloid leukaemia

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Zuber, Johannes, Shi, Junwei, Wang, Eric, Rappaport, Amy R., Herrmann, Harald, Sison, Edward A., Magoon, Daniel, Qi, Jun +12 more·2011·Nature

Abstract

Epigenetic pathways can regulate gene expression by controlling and interpreting chromatin modifications. Cancer cells are characterized by altered epigenetic landscapes, and commonly exploit the chromatin regulatory machinery to enforce oncogenic gene expression programs. Although chromatin alterations are, in principle, reversible and often amenable to drug intervention, the promise of targeting such pathways therapeutically has been limited by an incomplete understanding of cancer-specific dependencies on epigenetic regulators. Here we describe a non-biased approach to probe epigenetic vulnerabilities in acute myeloid leukaemia (AML), an aggressive haematopoietic malignancy that is often associated with aberrant chromatin states. By screening a custom library of small hairpin RNAs (shRNAs) targeting known chromatin regulators in a genetically defined AML mouse model, we identify the protein bromodomain-containing 4 (Brd4) as being critically required for disease maintenance. Suppression of Brd4 using shRNAs or the small-molecule inhibitor JQ1 led to robust antileukaemic effects in vitro and in vivo, accompanied by terminal myeloid differentiation and elimination of leukaemia stem cells. Similar sensitivities were observed in a variety of human AML cell lines and primary patient samples, revealing that JQ1 has broad activity in diverse AML subtypes. The effects of Brd4 suppression are, at least in part, due to its role in sustaining Myc expression to promote aberrant self-renewal, which implicates JQ1 as a pharmacological means to suppress MYC in cancer. Our results establish small-molecule inhibition of Brd4 as a promising therapeutic strategy in AML and, potentially, other cancers, and highlight the utility of RNA interference (RNAi) screening for revealing epigenetic vulnerabilities that can be exploited for direct pharmacological intervention.

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  • TRIM33 was identified as a unique requirement in B-ALL, whereas the majority of other dependencies had been identified in a prior AML screen.

    “The majority of these factors had been identified in a prior screen that evaluated the requirement of chromatin regulators in MLL-AF9/NrasG12D acute myeloid leukemia (AML) (Zuber et al., 2011b), however TRIM33 was identified here as a unique requirement in B-ALL.”

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Authors
Zuber, J., Shi, J., Wang, E., Rappaport, A. R., Herrmann, H., Sison, E. A., Magoon, D., Qi, J., Blatt, K., Wunderlich, M., Taylor, M. J., Johns, C., Chicas, A., Mulloy, J. C., Kogan, S. C., Brown, P., Valent, P., Bradner, J. E., Lowe, S. W., & Vakoc, C. R.
Affiliations
  • Cold Spring Harbor Laboratory (US)
  • Ludwig Boltzmann Institute for Hematology and Oncology (AT)
  • Johns Hopkins University (US)
  • Harvard University (US)
  • Medical University of Vienna (AT)
  • Cincinnati Children's Hospital Medical Center (US)
  • University of California, San Francisco (US)
  • Howard Hughes Medical Institute (US)
Corresponding author
  • Lowe, Scott W.
  • Vakoc, Christopher R.
Venue
Nature
Published
2011-08-03
Volume
478
Issue
7370
Pages
524-528
ISSN
  • 0028-0836 (ISSN-L)
  • 1476-4687
OpenAlex
W2129129812
Cited by
1,870
References
2
Citations by year
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FWCI
59.92
Type
journal article
Language
en
Open access
Locations
  • Nature (publishedVersion)
  • PubMed (publishedVersion)
  • Europe PMC (PubMed Central) (acceptedVersion)
  • PubMed Central (acceptedVersion)
  • Cold Spring Harbor Laboratory Institutional Repository (Cold Spring Harbor Laboratory) (acceptedVersion)
  • RePEc: Research Papers in Economics (submittedVersion)
Funders
  • Howard Hughes Medical Institute
  • National Cancer Institute (K08CA128972)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Protein Degradation and Inhibitors
  • Health Sciences › Medicine › Hematology › Acute Myeloid Leukemia Research
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Chromatin Remodeling and Cancer
Keywords
BRD4, acute myeloid leukemia, JQ1, chromatin regulators, epigenetic vulnerability, c-Myc, histone acetylation, bromodomain, leukemia stem cells, self-renewal, RNAi screen, small molecule inhibitors, therapeutic target
MeSH terms
Bromodomain Containing Proteins, Acetylation, Animals, Azepines, Cell Differentiation, Chromatin, Histones, Humans, Neoplasm Transplantation, Nuclear Proteins, Transcription Factors, Triazoles, Neoplastic Stem Cells, Leukemia, Myeloid, Acute, Gene Expression Regulation, Neoplastic, Genes, myc, Disease Progression, RNA Interference, RNA, Small Interfering, Epigenesis, Genetic, Cell Line, Tumor, Cell Proliferation, Mice

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