ArticleNucleic acids research2024
A bromodomain-independent mechanism of gene regulation by the BET inhibitor JQ1: direct activation of nuclear receptor PXR.
Article in Nucleic acids research, 2024. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 6 papers.
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Who cites it
6 citing papers in PubMed, 6 citations in OpenAlex.
- Epigenetic drugs in cancer therapy: mechanisms, immune modulation, and therapeutic applications.Molecular biomedicine · 2025Review
- PROTAC repurposing uncovers a noncanonical binding surface that mediates chemical degradation of nuclear receptors.Nature communications · 2025Article
- Exploring Phosphatase and Tensin Homologue Deleted on Chromosome Ten (PTEN) as a Potential Therapeutic Target for Cardiac Hypertrophy.ACS pharmacology & translational science · 2025Review
- A two-in-one expression construct for biophysical and structural studies of the human pregnane X receptor ligand-binding domain, a pharmaceutical and environmental target.Acta crystallographica. Section F, Structural biology communications · 2025Article
- PROTAC-mediated activation, rather than degradation, of a nuclear receptor reveals complex ligand-receptor interaction network.Structure (London, England : 1993) · 2024Article
- First-in-Class Small Molecule Degrader of Pregnane X Receptor Enhances Chemotherapy Efficacy.Journal of medicinal chemistry · 2024Article
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Authors and funding
12 authors at 1 institution in 1 country.
Funding
Abstract
Bromodomain and extraterminal (BET) proteins are extensively studied in multiple pathologies, including cancer. BET proteins modulate transcription of various genes, including those synonymous with cancer, such as MYC. Thus, BET inhibitors are a major area of drug development efforts. (+)-JQ1 (JQ1) is the prototype inhibitor and is a common tool to probe BET functions. While showing therapeutic promise, JQ1 is not clinically usable, partly due to metabolic instability. Here, we show that JQ1 and the BET-inactive (-)-JQ1 are agonists of pregnane X receptor (PXR), a nuclear receptor that transcriptionally regulates genes encoding drug-metabolizing enzymes such as CYP3A4, which was previously shown to oxidize JQ1. A PXR-JQ1 co-crystal structure identified JQ1's tert-butyl moiety as a PXR anchor and explains binding by (-)-JQ1. Analogs differing at the tert-butyl lost PXR binding, validating our structural findings. Evaluation in liver cell models revealed both PXR-dependent and PXR-independent modulation of CYP3A4 expression by BET inhibitors. We have characterized a non-BET JQ1 target, a mechanism of physiological JQ1 instability, a biological function of (-)-JQ1, and BET-dependent transcriptional regulation of drug metabolism genes.
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