Abstract
Castration-resistant prostate cancer (CRPC) is the main driving force of mortality in prostate cancer patients. Among the parameters contributing to the progression of CRPC and treatment failure, elevation of the steroidogenic enzyme AKR1C3 and androgen receptor variant 7 (AR-V7) are frequently reported. The AKR1C3/AR-V7 complex has been recognized as a major driver for drug resistance in advanced prostate cancer. Herein we report that the level of AKR1C3 is reciprocally regulated by the full-length androgen receptor (AR-FL) through binding to the distal enhancer region of the AKR1C3 gene. A novel function of PTUPB in AKR1C3 inhibition was discovered and PTUPB showed more effectiveness than indomethacin and celecoxib in suppressing AKR1C3 activity and CRPC cell growth. PTUPB synergizes with enzalutamide treatment in tumor suppression and gene signature regulation. Combination treatments with PTUPB and enzalutamide provide benefits by blocking AR/AR-V7 signaling, which inhibits the growth of castration relapsed VCaP xenograft tumors and patient-derived xenograft organoids. Targeting of the ARK1C3/AR/AR-V7 axis with PTUPB and enzalutamide may overcome drug resistance to AR signaling inhibitors in advanced prostate cancer.
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Data availability
The RNA sequence data in the present study have been deposited in Gene Expression Omnibus (GEO) with the accession number GSE216777. All data are available from the authors upon reasonable request.
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Acknowledgements
We sincerely thank Dr. Bo Chen in the Department of Urologic Surgery, Dr. Justin Siegel and Simon Kit Sang Chu in the Department of Chemistry at UC Davis for their assistance in our study.
Funding
This work was supported in part by grants from NIH/NCI R37CA249108 (Liu), R01CA251253 (Liu), Paul Calabresi Clinical Oncology K12 Program (5K12CA138464-09, Lara and Liu), NIH/NIEHS (RIVER Award) R35ES030443 (Hammock), NIH/NIEHS (Superfund Award) P42 ES004699 (Hammock), and UC Davis Comprehensive Cancer Center Support Grant (CCSG) awarded by the NCI (NCI P30CA093373). The maintenance and characterization of the LuCaP PDX models were supported by the Pacific Northwest Prostate Cancer SPORE (P50CA97186), the Department of Defense Prostate Cancer Biorepository Network (W81XWH-14-2-0183), and NCI P01-CA163227.
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JCY, BDH and CL conceived the project and designed the experiments. JCY, PX, HA, MG, and CL developed the methodology. JCY, PX, LJW, SN, and HA performed the experiments and acquired the data. MG, CPE, EC, ACG, PL, SHH, CM, and BDH provided technical and material support. SN and CL performed the bioinformatics analysis. JCY, CPE, SHH, BDH, and CL interpreted and analyzed the data. JCY and CL wrote the manuscript. LJW, SHH, CPE, and BDH edited the manuscript. CL supervised the study.
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PTUPB is covered under a University of California Patent with SHH and BDH. Other authors declare no conflict of interest, financial or otherwise.
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Yang, J.C., Xu, P., Ning, S. et al. Novel inhibition of AKR1C3 and androgen receptor axis by PTUPB synergizes enzalutamide treatment in advanced prostate cancer. Oncogene 42, 693–707 (2023). https://doi.org/10.1038/s41388-022-02566-6
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DOI: https://doi.org/10.1038/s41388-022-02566-6