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Prostate cancer is one of the most commonly diagnosed male malignancies. Genome wide association studies have revealed HNF1b to be a major risk gene for prostate cancer susceptibility. We examined the mechanisms of involvement of HNF1b in prostate cancer development. We integrated data from Gene Expression Omnibus prostate cancer genes from the Dragon Database of Genes Implicated in Prostate Cancer, and used meta-analysis data to generate a panel of HNF1b-associated prostate cancer risk genes. An RT-PCR was used to assess expression levels in DU145, PC3, LNCaP, and RWEP-1 cells. Twelve genes (BAG1, DDR1, ERBB4, ESR1, HSPD1, IGFBP2, IGFBP5, NR4A1, PAWR, PIK3CG, RAP2A, and TPD52) were found to be associated with both HNF1b and prostate cancer risk. Six of them (BAG1, ERBB4, ESR1, HSPD1, NR4A1, and PIK3CG) were mapped to the KEGG pathway, and submitted to further gene expression assessment. HNF1b, NR4A1, and HSPD1 were found to be highly expressed in the LNCaP androgenic hormone-dependent cell line. Compared to expression levels in wild-type prostate cancer cells, NR4A1, HSPD1, ERBB4, and ESR1 expression levels were also found to be significantly increased in the HNF1b-transfected cells. We conclude that the mechanism of action of HNF1b in prostate cancer involves modulation of the association between androgenic hormone and prostate cancer cells. Gene-gene interaction and coordination should be taken into account to determine relationships between specific loci and diseases.

HNF1b is involved in prostate cancer risk via modulating androgenic hormone effects and coordination with other genes