Androgen receptor coregulators NOCR1, TIF2, and ARA70 may account for the hydroxyflutamide insensitivity of prostate cancer cells.

Abstract:

INTRODUCTION:Prostate cancer cells can switch from an androgen-dependent state to an androgen-independent state after a continuous androgen ablation therapy. However, the molecular mechanisms underlying this switch are still unclear. Therefore, we explored the change in androgen receptor (AR)-related gene expression during this transition in a novel cell model. MATERIAL AND METHODS:Prostate cancer cells were continuously treated with competitive androgen receptor inhibitor hydroxyflutamide for 1.5 years, which yielded an flutamide-insensitive LNCaP subline, LNCaP-flu, as confirmed by MTT assays, flow cytometry, and electron microscopy. We analyzed the differences in gene expression in LNCaP-flu cells and LNCaP cells using gene chips and follow-up RT-PCR. RESULTS:Over 2,428 genes were differentially expressed between these cell lines: 1,194 were down-regulated and 1,234 were up-regulated. Three genes in particular were considered related to the androgen-dependent transition: NCOR1, TIF2 (NCOA2), and ARA70 (NCOA4). There were no apparent changes in expression of the androgen receptor or prostate-specific antigen. CONCLUSION:ARs and associated coregulators play a central role in the flutamide-insensitive transition of prostate cancer cells. Although AR expression does not change during this transition, the change in AR coregulators may be a critical factor in the development of antiandrogen insensitivity.

journal_name

Ir J Med Sci

authors

Wang Y,Li JQ,Shao C,Shi CH,Liu F,Yang ZY,Qiu JX,Li YM,Fu Q,Zhang W,Xue W,Lei YH,Gao JY,Wang JY,Gao XP,Yuan JL,Bao TY,Zhang YT

doi

10.1007/s11845-011-0714-4

subject

Has Abstract

pub_date

2011-12-01 00:00:00

pages

865-72

issue

4

eissn

0021-1265

issn

1863-4362

journal_volume

180

pub_type

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