Abstract
Background
It is imperative to develop novel therapeutics to overcome chemoresistance, a significant obstacle in the clinical management of prostate cancer (PCa) and other cancers.
Methods
A phenotypic screen was performed to identify novel inhibitors of chemoresistant PCa cells. The mechanism of action of potential candidate(s) was investigated using in silico docking, and molecular and cellular assays in chemoresistant PCa cells. The in vivo efficacy was evaluated in mouse xenograft models of chemoresistant PCa.
Results
Nicardipine exhibited high selectivity and potency against chemoresistant PCa cells via inducing apoptosis and cell cycle arrest. Computational, molecular, and cellular studies identified nicardipine as a putative inhibitor of embryonic ectoderm development (EED) protein, and the results are consistent with a proposed mechanism of action that nicardipine destabilised enhancer of zeste homologue 2 (EZH2) and inhibited key components of noncanonical EZH2 signalling, including transducer and activator of transcription 3, S-phase kinase-associated protein 2, ATP binding cassette B1, and survivin. As a monotherapy, nicardipine effectively inhibited the skeletal growth of chemoresistant C4-2B-TaxR tumours. As a combination regimen, nicardipine synergistically enhanced the in vivo efficacy of docetaxel against C4-2 xenografts.
Conclusion
Our findings provided the first preclinical evidence supporting nicardipine as a novel EED inhibitor that has the potential to be promptly tested in PCa patients to overcome chemoresistance and improve clinical outcomes.
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Data availability
All raw data supporting the findings of this study are available from the corresponding author upon reasonable request.
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Acknowledgements
We thank Dr Rhea-Beth Markowitz at Georgia Cancer Center, Augusta University, for editorial assistance.
Funding
This work was supported by the National Cancer Institute grants R01CA256058 and R42CA217491, National Institute on Minority Health and Health Disparities Research Center in Minority Institution grant U54MD007590, Department of Education Title III Program at Clark Atlanta University, Georgia Research Alliance VentureLab grant, and Emory University Biological Discovery through Chemical Innovation Initiative Seed Grant (DW).
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Conceptualisation: YD, HF, OK, DW. Methodology and investigation: XL, YC, YY, LB, RZ, YW, Z-RX, JMW, NJB, AD, NC, DL, MQ, YD. Data curation: XL, Z-RX, NJB, YD, DW. Formal analysis: XL, Z-RX, YD, DW. Funding acquisition: DW. Manuscript preparation: XL, YW, Z-RX, NJB, YD, HF, AOO, OK, DW.
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The Institutional Animal Care and Use Committee (IACUC) at Augusta University approved all animal protocols used in this study. All animal procedures were subjected to National Institutes of Health guidelines.
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Li, X., Chen, Y., Bai, L. et al. Nicardipine is a putative EED inhibitor and has high selectivity and potency against chemoresistant prostate cancer in preclinical models. Br J Cancer 129, 884–894 (2023). https://doi.org/10.1038/s41416-023-02359-y
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DOI: https://doi.org/10.1038/s41416-023-02359-y
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