期刊
CANCER RESEARCH
卷 69, 期 1, 页码 137-142出版社
AMER ASSOC CANCER RESEARCH
DOI: 10.1158/0008-5472.CAN-08-3633
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- Ministry of Education, Culture, Sports, Science, and Technology
- Japan Society for the Promotion of Science
- Ministry of Health, Labor, and Welfare
- Promotion and Mutual Aid Corporation for Private Schools of Japan
Androgen receptor (AR) is a critical transcription factor that regulates various target genes and contributes to the pathophysiology of prostate cancer hormone dependently. Here, we identify amyloid precursor protein (APP) as a primary androgen target through chromatin immunoprecipitation (ChIP) combined with genome tiling array analysis (ChIP-chip). ChIP-treated DNA were obtained from prostate cancer LNCaP cells with R1881 or vehicle treatment using AR or acetylated historic H3 antibodies. Ligand-dependent AR binding was further enriched by PCR subtraction. Using chromosome 21/22 arrays, we identified APP as one of the androgen-regulated genes with adjacent functional AR binding sites. APP expression is androgen-inducible in LNCaP cells and APP immunoreactivity was correlated with poor prognosis in patients with prostate cancer. Gain-of-function and loss-of-function studies revealed that APP promotes the tumor growth of prostate cancer. The present study reveals a novel APP-mediated pathway responsible for the androgen-dependent growth of prostate cancer. Our findings will indicate that APP could be a potential molecular target for the diagnosis and treatment of prostate cancer. [Cancer Res 2009;69(1):137-42]
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