Cheng Yue, Yu Pan, Duan Xiuzhi, Liu Chunhua, Xu Siqi, Chen Yuhua, Tan Yunnian, Qiang Yun, Shen Junfang, Tao Zhihua
Department of Laboratory Medicine, The Second Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, Zhejiang 310009, P.R. China.
Exp Ther Med. 2015 Jun;9(6):2319-2324. doi: 10.3892/etm.2015.2406. Epub 2015 Apr 3.
The transformation of prostate cancer from an androgen-dependent state to an androgen-independent state is a lethal progression. Alterations in transcriptional programs are the basis of prostate cancer deterioration. The androgen receptor (AR), a member of the nuclear hormone receptor superfamily, mediates prostate cancer progression by functioning primarily through the ligand-activated transcription of target genes. Therefore, a detailed map of AR-regulated genes and AR genomic binding sites is required for hormone-naive and castration-resistant prostate cancer. Through the use of chromatin immunoprecipitation in combination with direct sequencing, 4,143 AR binding sites were defined in the LNCaP androgen-sensitive prostate cancer cell line. Using the same method, 2,380 AR binding regions were identified in the LNCaP-AI long-term androgen-deprived cell line. Approximately 8.5% (354/4,143) of the binding regions were mapped to within 2 kb of the transcription start site (TSS) in the LNCaP cells, while ∼12.6% (299/2,380) were mapped to within 2 kb of the TSS in the LNCaP-AI cells. In total, the study mapped 2,796 genes in LNCaP cells and 1,854 genes in LNCaP-AI cells. The cell lines shared 789 mutual genes. In addition, gene ontology (GO) analysis of the genes revealed that there was a notable overlap between the GO terms in the LNCaP cells and LNCaP-AI cells. However, GO terms within the biological process domain that were only observed in the LNCaP-AI cells included the reproduction process, death, immune system process, multi-organism process, pigmentation and viral reproduction. The major genes in the different GO terms were TNFAIP8, RTN4, APP and SYNE1. Through analyzing the AR binding sites in the two cell types, the present study aimed to map potential AR-regulated genes, identify their associated transcription factors and provide a new perspective on the biological processes in the development of prostate cancer. The results provided a valuable data set that furthered the understanding of the genome-wide analysis of AR binding sites in prostate cancer cells, which may be exploited for the development of novel prostate cancer therapeutic strategies.
前列腺癌从雄激素依赖状态转变为雄激素非依赖状态是一种致命的进展。转录程序的改变是前列腺癌恶化的基础。雄激素受体(AR)是核激素受体超家族的成员,主要通过靶基因的配体激活转录发挥作用,介导前列腺癌的进展。因此,对于激素初治和去势抵抗性前列腺癌,需要一份AR调控基因和AR基因组结合位点的详细图谱。通过将染色质免疫沉淀与直接测序相结合,在LNCaP雄激素敏感前列腺癌细胞系中确定了4143个AR结合位点。使用相同方法,在LNCaP-AI长期雄激素剥夺细胞系中鉴定出2380个AR结合区域。在LNCaP细胞中,约8.5%(354/4143)的结合区域定位在转录起始位点(TSS)的2 kb范围内,而在LNCaP-AI细胞中约12.6%(299/2380)定位在TSS的2 kb范围内。该研究总共在LNCaP细胞中定位了2796个基因,在LNCaP-AI细胞中定位了1854个基因。这两种细胞系共有789个共同基因。此外,对这些基因的基因本体(GO)分析表明,LNCaP细胞和LNCaP-AI细胞中的GO术语之间存在显著重叠。然而,仅在LNCaP-AI细胞中观察到的生物过程域内的GO术语包括生殖过程、死亡、免疫系统过程、多生物体过程、色素沉着和病毒复制。不同GO术语中的主要基因是TNFAIP8、RTN4、APP和SYNE1。通过分析两种细胞类型中的AR结合位点,本研究旨在绘制潜在的AR调控基因图谱,识别其相关转录因子,并为前列腺癌发展中的生物学过程提供新的视角。研究结果提供了一个有价值的数据集,进一步加深了对前列腺癌细胞中AR结合位点全基因组分析的理解,这可能有助于开发新的前列腺癌治疗策略。