Selection and cloning of poly(rC)-binding protein 2 and Raf kinase inhibitor protein RNA activators of 2',5'-oligoadenylate synthetase from prostate cancer cells.

Selection and cloning of poly(rC)-binding protein 2 and Raf kinase inhibitor protein RNA activators of 2',5'-oligoadenylate synthetase from prostate cancer cells.
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DOI:
10.1093/nar/gkl968
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发表时间:
2006
影响因子:
14.9
通讯作者:
Silverman RH
Silverman RH
中科院分区:
生物学2区
文献类型:
--
作者:
Molinaro RJ;Jha BK;Malathi K;Varambally S;Chinnaiyan AM;Silverman RH

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RNase L 的抗病毒和抗肿瘤功能是通过与变构效应子 5'-磷酸化、2',5'-连接的寡腺苷酸结合来实现的 (2-5A)。 2-5A 由干扰素诱导型 2',5'-寡腺苷酸合成酶 (OAS) 在病毒双链 RNA (dsRNA) 激活后产生。由于 RNase L 突变被认为是前列腺癌的危险因素,因此我们试图确定前列腺癌细胞中是否存在 OAS 激活剂。我们发现,前列腺癌细胞系(PC3、LNCaP 和 DU145)含有能够结合并激活 OAS 的 RNA 片段,而正常前列腺上皮细胞 (PrEC) 则不然。为了鉴定 RNA 激活剂,我们开发了一种基于 RNA 对 OAS 的严格亲和力的 cDNA 克隆策略。因此,我们鉴定了与 OAS 结合并有效激活 OAS 的 Raf 激酶抑制剂蛋白 (RKIP) 和聚 (rC) 结合蛋白 2 (PCBP2) 的 mRNA。此外,PC3 细胞中存在人内源性逆转录病毒 (hERV) 包膜 RNA,可结合并激活 OAS。多项基因表达谱研究的分析表明,PCBP2 RNA 在转移性前列腺癌中持续升高。结果表明,在体内 RKIP 和 PCBP2 的细胞 mRNA 刺激下,前列腺癌细胞中可能发生 OAS 激活。
The antiviral and antitumor functions of RNase L are enabled by binding to the allosteric effectors 5′-phosphorylated, 2′,5′-linked oligoadenylates (2-5A). 2-5A is produced by interferon-inducible 2′,5′-oligoadenylate synthetases (OAS) upon activation by viral double-stranded RNA (dsRNA). Because mutations in RNase L have been implicated as risk factors for prostate cancer, we sought to determine if OAS activators are present in prostate cancer cells. We show that prostate cancer cell lines (PC3, LNCaP and DU145), but not normal prostate epithelial cells (PrEC), contain RNA fractions capable of binding to and activating OAS. To identify the RNA activators, we developed a cDNA cloning strategy based on stringent affinity of RNAs for OAS. We thus identified mRNAs for Raf kinase inhibitor protein (RKIP) and poly(rC)-binding protein 2 (PCBP2) that bind and potently activate OAS. In addition, human endogenous retrovirus (hERV) envelope RNAs were present in PC3 cells that bind and activate OAS. Analysis of several gene expression profiling studies indicated that PCBP2 RNA was consistently elevated in metastatic prostate cancer. Results suggest that OAS activation may occur in prostate cancer cells in vivo stimulated by cellular mRNAs for RKIP and PCBP2.
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