Androgen modulation of XBP1 is functionally driving part of the AR transcriptional program.

Abstract:

:Prostate cancer development and progression is largely dependent on androgen receptor (AR) signaling. AR is a hormone-dependent transcription factor, which binds to thousands of sites throughout the human genome to regulate expression of directly responsive genes, including pro-survival genes that enable tumor cells to cope with increased cellular stress. ERN1 and XBP1 - two key players of the unfolded protein response (UPR) - are among such stress-associated genes. Here, we show that XBP1 levels in primary prostate cancer are associated with biochemical recurrence in five independent cohorts. Patients who received AR-targeted therapies had significantly lower XBP1 expression, whereas expression of the active form of XBP1 (XBP1s) was elevated. In vitro results show that AR-induced ERN1 expression led to increased XBP1s mRNA and protein levels. Furthermore, ChIP-seq analysis revealed that XBP1s binds enhancers upon stress stimuli regulating genes involved in UPR processes, eIF2 signaling and protein ubiquitination. We further demonstrate genomic overlap of AR- and XBP1s-binding sites, suggesting genomic conversion of the two signaling cascades. Transcriptomic effects of XBP1 were further studied by knockdown experiments, which lead to decreased expression of androgen-responsive genes and UPR genes. These results suggest a two-step mechanism of gene regulation, which involves androgen-induced expression of ERN1, thereby enhancing XBP1 splicing and transcriptional activity. This signaling cascade may prepare the cells for the increased protein folding, mRNA decay and translation that accompanies AR-regulated tumor cell proliferation.

journal_name

Endocr Relat Cancer

journal_title

Endocrine-related cancer

authors

Stelloo S,Linder S,Nevedomskaya E,Valle-Encinas E,de Rink I,Wessels LFA,van der Poel H,Bergman AM,Zwart W

doi

10.1530/ERC-19-0181

subject

Has Abstract

pub_date

2020-02-01 00:00:00

pages

67-79

issue

2

eissn

1351-0088

issn

1479-6821

pii

ERC-19-0181.R1

journal_volume

27

pub_type

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