

expression can occur without the need for additional factors
in cellular splicing machinery like
Malat1
, due to genomic
duplication in the
AR
locus
[28].
5.
Conclusions
In summary, these results suggest that targeting the
Malat1
/AR-v7 axis
via Malat1
-siRNA or ASC-J9 can be
developed as a new therapy to better suppress the EnzR-
PCa progression.
Author contributions:
Chawnshang Chang had full access to all the data
in the study and takes responsibility for the integrity of the data and the
accuracy of the data analysis.
Study concept and design:
Chang, Sun.
Acquisition of data:
Wang, Lin, Lin, Antonarakis, Luo.
Analysis and interpretation of data:
Sun, Li, Antonarakis, Luo.
Drafting of the manuscript:
Wang, Sun, Chang.
Critical revision of the manuscript for important intellectual content:
Chang.
Statistical analysis:
Luo, Antonarakis.
Obtaining funding:
Chang.
Administrative, technical, or material support:
Niu, Yeh.
Supervision:
None.
Other:
None.
Financial disclosures:
Chawnshang Chang certifies that all conflicts of
interest, including specific financial interests and relationships and
affiliations relevant to the subject matter or materials discussed in the
manuscript (eg, employment/affiliation, grants or funding, consultan-
cies, honoraria, stock ownership or options, expert testimony, royalties,
or patents filed, received, or pending), are the following: ASC-J9 was
patented by the University of Rochester, University of North Carolina,
and AndroScience, and then licensed to AndroScience. All authors
declare there are no potential conflicts of interest related to this
manuscript.
Funding/Support and role of the sponsor:
This work was supported by
NIH Grants (CA127300 and CA156700), Taiwan Department of Health
Clinical Trial and Research Center of Excellence Grant DOH99-TD-B-111-
004 (China Medical University, Taichung, Taiwan).
Appendix A. Supplementary data
Supplementary data associated with this article can be
found, in the online version, at
http://dx.doi.org/10.1016/j. eururo.2016.04.035.
References
[1]
Sun S, Sprenger CC, Vessella RL, et al. Castration resistance in human prostate cancer is conferred by a frequently occurring androgen receptor splice variant. J Clin Invest 2010;120:2715–30.[2]
Heinlein CA, Chang C. Androgen receptor in prostate cancer. Endocr Rev 2004;25:276–308.
[3]
Vogelzang NJ. Enzalutamide—a major advance in the treatment of metastatic prostate cancer. N Engl J Med 2012;367:1256–7.
[4]
Antonarakis ES, Lu C, Wang H, et al. AR-V7 and resistance to enzalutamide and abiraterone in prostate cancer. N Engl J Med 2014;371:1028–38.[5]
Yang L, Lin C, Jin C, et al. lncRNA-dependent mechanisms of andro- gen-receptor-regulated gene activation programs. Nature 2013;500:598–602.[6]
Ren S, Liu Y, Xu W, et al. Long noncoding RNA MALAT-1 is a new potential therapeutic target for castration resistant prostate cancer. J Urol 2013;190:2278–87.
[7]
Tripathi V, Ellis JD, Shen Z, et al. The nuclear-retained noncoding RNA MALAT1 regulates alternative splicing by modulating SR splic- ing factor phosphorylation. Mol Cell 2010;39:925–38.
[8]
Hu R, Lu C, Mostaghel EA, et al. Distinct transcriptional programs mediated by the ligand-dependent full-length androgen receptor and its splice variants in castration-resistant prostate cancer. Can- cer Res 2012;72:3457–62.
[9]
Wang J, Su L, Chen X, et al. MALAT1 promotes cell proliferation in gastric cancer by recruiting SF2/ASF. Biomed Pharmacother 2014;68:557–64.
[10]
Liu LL, Xie N, Sun S, et al. Mechanisms of the androgen receptor splicing in prostate cancer cells. Oncogene 2014;33:3140–50.[11]
Soh SF, Huang CK, Lee SO, et al. Determination of androgen receptor degradation enhancer ASC-J9((R)) in mouse sera and organs with liquid chromatography tandem mass spectrometry. J Pharm Biomed Anal 2014;88:117–22.[12]
Lu T, Lin WJ, Izumi K, et al. Targeting androgen receptor to suppress macrophage-induced EMT and benign prostatic hyperplasia (BPH) development. Mol Endocrinol 2012;26:1707–15.[13]
Yamashita S, Lai KP, Chuang KL, et al. ASC-J9 suppresses castra- tion-resistant prostate cancer growth through degradation of full- length and splice variant androgen receptors. Neoplasia 2012;14:74–83.
[14]
Wu MH, Ma WL, Hsu CL, et al. Androgen receptor promotes hepatitis B virus-induced hepatocarcinogenesis through modula- tion of hepatitis B virus RNA transcription. Sci Transl Med 2010;2:32ra35.[15]
Lai KP, Huang CK, Chang YJ, et al. New therapeutic approach to suppress castration-resistant prostate cancer using ASC-J9 via tar- geting androgen receptor in selective prostate cells. Am J Pathol 2013;182:460–73.[16]
Korpal M, Korn JM, Gao X, et al. An F876L mutation in androgen receptor confers genetic and phenotypic resistance to MDV3100 (enzalutamide). Cancer Discov 2013;3:1030–43.
[17]
Joseph JD, Lu N, Qian J, et al. A clinically relevant androgen receptor mutation confers resistance to second-generation antiandrogens enzalutamide and ARN-509. Cancer Discov 2013;3:1020–9.[18]
Wang R, Lin W, Lin C, et al. ASC-J9((R)) suppresses castration resistant prostate cancer progression via degrading the enzaluta- mide-induced androgen receptor mutant AR-F876L. Cancer Lett 2016;379:154–60.[19]
Arora VK, Schenkein E, Murali R, et al. Glucocorticoid receptor confers resistance to antiandrogens by bypassing androgen recep- tor blockade. Cell 2013;155:1309–22.[20]
Hornberg E, Ylitalo EB, Crnalic S, et al. Expression of androgen receptor splice variants in prostate cancer bone metastases is associated with castration-resistance and short survival. PLoS One 2011;6:e19059.
[21]
Li L, Xie H, Liang L, et al. Increased PrLZ-mediated androgen receptor transactivation promotes prostate cancer growth at cas- tration-resistant stage. Carcinogenesis 2013;34:257–67.
[22]
Zhu ML, Kyprianou N. Androgen receptor and growth factor signal- ing cross-talk in prostate cancer cells. Endocr Relat Cancer 2008;15:841–9.[23]
Dai B, Chen H, Guo S, et al. Compensatory upregulation of tyrosine kinase Etk/BMX in response to androgen deprivation promotes castration-resistant growth of prostate cancer cells. Cancer Res 2010;70:5587–96.
[24]
Culig Z, Bartsch G, Hobisch A. Interleukin-6 regulates androgen receptor activity and prostate cancer cell growth. Mol Cell Endo- crinol 2002;197:231–8.E U R O P E A N U R O L O G Y 7 2 ( 2 0 1 7 ) 8 3 5 – 8 4 4
843