Androgen receptor signalling impairs docetaxel efficacy in castration-resistant prostate cancer.

Abstract:

:Androgen receptor (AR) signalling drives neoplastic growth and therapy resistance in prostate cancer. Recent clinical data show that docetaxel combined with androgen deprivation therapy improves outcome in hormone-sensitive disease. We studied whether testosterone and AR signalling interferes with docetaxel treatment efficacy in castration-resistant prostate cancer (CRPC). We found that testosterone supplementation significantly impaired docetaxel tumour accumulation in a CRPC model, resulting in decreased tubulin stabilisation and antitumour activity. Furthermore, testosterone competed with docetaxel for uptake by the drug transporter OATP1B3. Irrespective of docetaxel-induced tubulin stabilisation, AR signalling by testosterone counteracted docetaxel efficacy. AR-pathway activation could also reverse long-term tumour regression by docetaxel treatment in vivo. These results indicate that to optimise docetaxel efficacy, androgen levels and AR signalling need to be suppressed. This study lends evidence for continued maximum suppression of AR signalling by combining targeted therapeutics with docetaxel in CRPC.

journal_name

Br J Cancer

authors

Mout L,Moll JM,Chen M,de Morrée ES,de Ridder CMA,Gibson A,Stuurman D,Aghai A,Erkens-Schulze S,Mathijssen RHJ,Sparreboom A,de Wit R,Lolkema MP,van Weerden WM

doi

10.1038/s41416-020-01105-y

subject

Has Abstract

pub_date

2020-12-01 00:00:00

pages

1715-1719

issue

12

eissn

0007-0920

issn

1532-1827

pii

10.1038/s41416-020-01105-y

journal_volume

123

pub_type

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