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The BET-inhibitor PFI-1 Diminishes AR/AR-V7 Signaling in Prostate Cancer Cells

Marie C Hupe, M Raschid Hoda, Friedemann Zengerling, Sven Perner, Axel S Merseburger, Marcus V Cronauer

World J Urol. 2019 Feb;37(2):343-349.

PMID: 29934670

Abstract:

Objective:
The bromodomain and extra-terminal (BET) family of proteins provides a scaffolding platform for the recruitment and tethering of transcription factors to acetylated chromatin, thereby modulating gene expression. In this study, we evaluated the efficacy of the BET-inhibitor PFI-1 to diminish AR/AR-V7 signaling and proliferation in castration-resistant prostate cancer cells.
Methods:
Prostate-specific antigen and androgen receptor (AR) protein were quantified by means of two commercial ELISAs. Transactivation of the AR, AR-V7 and Q641X was determined by reporter gene assays. Cell proliferation was measured using a colorimetric MTT-assay.
Results:
PFI-1 dose-dependently inhibited transactivation of full-length AR (non- mutated, i.e., wild-type or point-mutated/promiscuous forms) without affecting their cellular protein levels. Moreover, PFI-1 was active against C-terminally truncated constitutively active ARs like AR-V7 and Q641X. Prostate cancer cells exhibiting a transcriptionally active AR-signaling complex (LNCaP, 22Rv1) were more susceptible to the growth-inhibitory effects than the AR-negative PC-3 cells.
Conclusion:
The quinazolinone PFI-1 is a highly efficient inhibitor of AR-signaling-competent prostate cancer cells in vitro. PFI-1 could serve as a lead compound for the development of new therapeutics able to block AR/AR-V7 signaling in advanced prostate cancer.

Chemicals Related in the Paper:

Catalog Number Product Name Structure CAS Number Price
AP1403764726 PFI-1 PFI-1 1403764-72-6 Price
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