Developing new targeting strategy for androgen receptor variants in castration resistant prostate cancer.

Abstract:

:The presence of androgen receptor variant 7 (AR-V7) variants becomes a significant hallmark of castration-resistant prostate cancer (CRPC) relapsed from hormonal therapy and is associated with poor survival of CRPC patients because of lacking a ligand-binding domain. Currently, it still lacks an effective agent to target AR-V7 or AR-Vs in general. Here, we showed that a novel class of agents (thailanstatins, TSTs and spliceostatin A analogs) can significantly suppress the expression of AR-V7 mRNA and protein but in a less extent on the full-length AR expression. Mechanistically, TST-D is able to inhibit AR-V7 gene splicing by interfering the interaction between U2AF65 and SAP155 and preventing them from binding to polypyrimidine tract located between the branch point and the 3' splice site. In vivo, TST-D exhibits a potent tumor inhibitory effect on human CRPC xenografts leading to cell apoptosis. The machinery associated with AR gene splicing in CRPC is a potential target for drugs. Based on their potency in the suppression of AR-V7 responsible for the growth/survival of CRPC, TSTs representing a new class of anti-AR-V agents warrant further development into clinical application.

journal_name

Int J Cancer

authors

Wang B,Lo UG,Wu K,Kapur P,Liu X,Huang J,Chen W,Hernandez E,Santoyo J,Ma SH,Pong RC,He D,Cheng YQ,Hsieh JT

doi

10.1002/ijc.30893

subject

Has Abstract

pub_date

2017-11-15 00:00:00

pages

2121-2130

issue

10

eissn

0020-7136

issn

1097-0215

journal_volume

141

pub_type

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