| Literature DB >> 30537514 |
Amanda Balboni Iniguez1, Gabriela Alexe2, Emily Jue Wang1, Giovanni Roti3, Sarvagna Patel4, Liying Chen1, Samuel Kitara1, Amy Conway5, Amanda L Robichaud5, Björn Stolte6, Pratiti Bandopadhayay1, Amy Goodale7, Sasha Pantel7, Yenarae Lee7, Dorian M Cheff8, Matthew D Hall8, Rajarshi Guha8, Mindy I Davis8, Marie Menard9, Nicole Nasholm9, William A Weiss9, Jun Qi10, Rameen Beroukhim11, Federica Piccioni7, Cory Johannessen7, Kimberly Stegmaier12.
Abstract
Drug resistance represents a major challenge to achieving durable responses to cancer therapeutics. Resistance mechanisms to epigenetically targeted drugs remain largely unexplored. We used bromodomain and extra-terminal domain (BET) inhibition in neuroblastoma as a prototype to model resistance to chromatin modulatory therapeutics. Genome-scale, pooled lentiviral open reading frame (ORF) and CRISPR knockout rescue screens nominated the phosphatidylinositol 3-kinase (PI3K) pathway as promoting resistance to BET inhibition. Transcriptomic and chromatin profiling of resistant cells revealed that global enhancer remodeling is associated with upregulation of receptor tyrosine kinases (RTKs), activation of PI3K signaling, and vulnerability to RTK/PI3K inhibition. Large-scale combinatorial screening with BET inhibitors identified PI3K inhibitors among the most synergistic upfront combinations. These studies provide a roadmap to elucidate resistance to epigenetic-targeted therapeutics and inform efficacious combination therapies.Entities:
Keywords: BET inhibition; MYCN; PI3K signaling; drug resistance; enhancer remodeling; neuroblastoma
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Year: 2018 PMID: 30537514 PMCID: PMC6352909 DOI: 10.1016/j.ccell.2018.11.005
Source DB: PubMed Journal: Cancer Cell ISSN: 1535-6108 Impact factor: 31.743