Abstract:
:Castration-resistant prostate cancer (CRPC) continues to be a major clinical problem and the mechanisms behind it remain unclear. Thioredoxin domain-containing protein 5 (TXNDC5) is involved in protein folding and chaperone activity, and its overexpression has been reported in multiple malignancies. In the current study, we demonstrated that TXNDC5 is up-regulated following long-term androgen-deprivation treatment (ADT) and is highly overexpressed in CRPC tumors compared with hormone-naive prostate cancer (PCa) cases. Functionally, in vitro and in vivo studies demonstrated that TXNDC5 overexpression promotes the growth of both androgen-dependent and castration-resistant PCa xenografts. Mechanistically, TXNDC5 directly interacts with the AR protein to increase its stability and thus enhances its transcriptional activity. TXDNC5-mediated CRPC growth can be fully abolished by AR inhibition, suggesting TXDNC5 up-regulation as an escape pathway for aberrant AR re-activation and CRPC growth in the milieu of low androgen. Indeed, we found that TXNDC5 is increased by ADT-induced hypoxia through HIF-1α in an miR-200b-dependent manner. Overall, we defined an important role of TXNDC5 in CRPC and further investigations are needed to screen TXNDC5 antagonists as a novel therapeutic approaches to treat PCa patients with CRPC.
journal_name
Oncogenejournal_title
Oncogeneauthors
Wang L,Song G,Chang X,Tan W,Pan J,Zhu X,Liu Z,Qi M,Yu J,Han Bdoi
10.1038/onc.2014.401subject
Has Abstractpub_date
2015-09-03 00:00:00pages
4735-45issue
36eissn
0950-9232issn
1476-5594pii
onc2014401journal_volume
34pub_type
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