RNA Binding Proteins in Cancer

癌症中的 RNA 结合蛋白

• 批准号: 8444646
• 负责人: Shrikant Anant
• 金额: $ 28.38万
• 依托单位: UNIVERSITY OF KANSAS MEDICAL CENTER
• 依托单位国家: 美国
• 财政年份: 2009
• 资助国家: 美国
• 起止时间: 2009-04-01 至 2014-01-31
• 项目状态: 已结题
• 来源: https://reporter.nih.gov/project-details/8444646
• 关键词: 3' Untranslated Regions; Affinity; Anchorage-Independent Growth; Apoptosis; Behavior; Binding; Binding Sites; C-terminal; Cancer Model; Cause of Death; Cell Death; Cell Survival; Cells; Colon Carcinoma; Consensus; Deletion Mutation; Disease; Elements; Epidermal Growth Factor; Epithelial Cells; Gene Expression; Gene Expression Regulation; Genetic Translation; Glycine; Goals; Growth; Interleukin-8; Intestines; Lead; Malignant Neoplasms; Manuscripts; Mediating; Messenger RNA; Methods; MicroRNAs; Mitosis; Mitotic; Modification; Mus; Mutagenesis; N-terminal; Normal Cell; Nude Mice; Pathway interactions; Phenotype; Phosphorylation; Post-Transcriptional Regulation; Process; Promoter Regions; Protein Binding; Protein Overexpression; Proteins; Proto-Oncogenes; Publishing; RNA Binding; RNA Recognition Motif; RNA Sequences; RNA Stability; RNA-Binding Proteins; Ribonucleoproteins; Ribosomes; Role; Serine; Signal Pathway; Site; Threonine; Transcript; Transcriptional Activation; Translations; Tyrosine Phosphorylation Site; Ubiquitination; United States; Vascular Endothelial Growth Factors; Work; Xenograft procedure; base; cancer cell; cyclooxygenase 2; deletion analysis; human FRAP1 protein; mRNA Decay; mRNA Stability; mTOR protein; mutant; neoplastic cell; notch protein; novel; overexpression; promoter; research study; tumor; tumor xenograft; tumorigenesis

The broad goal of the project is to understand the mechanisms by which RNA binding protein RBM3 regulates gene expression at the posttranscriptional level of mRNA stability and translation in cancer cells. We have identified that overexpression of the protein causes a normal cell to undergo a transformed phenotype resulting in the cells forming tumors in immunocompromized mice. On the other hand, knockdown of RBM3 expression results in cell death due to mitotic catastrophe. RBM3 interacts with HuR and hnRNP A1, and with AU-RNA sequences to enhance mRNA stability and translation of AU-rich transcripts such as COX-2, VEGF and IL-8. In addition, RBM3 overexpression increases the activation of the mammalian target of rapamycin protein in a Notch dependent mechanism. We have also identified microRNAs regulated upon RBM3 overexpression, including downregulating one that inhibits its own expression. Our studies also suggest that RBM3 is regulated at the posttranslational levels of phosphorylation, ubiquitination and SUMOylation. Based on these observations, we propose three specific aims. In Aim 1, we will determine the mechanism by which RNA binding protein RBM3 regulates gene expression. Here, we will identify the RNA sequences that interact with RBM3. In addition, we will determine the sequenced in COX-2 3'UTR that are required for RBM3-mediated COX-2 mRNA stability and translation. We will also identify the role of HuR and hnRNP-A1 in the process. In Aim 2, we will determine the residues in RBM3 that undergo phosphorylation, ubiquitination and SUMOylation by mutagenesis. We will also determine the effect of the mutants on mRNA stability and translation. In Aim 3, we propose to determine the mechanisms by which RBM3 induces tumorigenesis. We will use an xenograft cancer model to determine the role of mTOR and Notch pathway in RBM3 mediated tumorigenesis. Also, the role of microRNAs in the tumorigenesis will be determined. Completion of these experiments should give us a better understanding of how the RNA binding protein RBM3 functions in normal epithelial cells, and whether changes in the RBM3 expression that is observed in tumor cells is responsible for tumor behavior.

该项目的广泛目标是了解RNA结合的机制 蛋白RBM3调节mRNA转录后水平的基因表达 癌细胞中的稳定性和翻译。我们已经确定了 蛋白质导致正常细胞发生转化的表型，导致细胞 在免疫功能低下的小鼠中形成肿瘤。另一方面，击倒RBM3 表达导致因有丝分裂灾难引起的细胞死亡。 RBM3与Hur和 HNRNP A1，并具有Au-RNA序列，以增强mRNA稳定性和翻译 富含AU的转录本，例如COX-2，VEGF和IL-8。此外，RBM3过表达 增加置口水中雷帕霉素蛋白的哺乳动物靶标的激活 依赖机制。我们还确定了对RBM3调节的microRNA 过表达，包括下调抑制其自身表达的一种。我们的 研究还表明，RBM3受到翻译后水平的调节 磷酸化，泛素化和Sumoylation。基于这些观察，我们 提出三个具体目标。在AIM 1中，我们将确定RNA的机制 结合蛋白RBM3调节基因表达。在这里，我们将确定RNA 与RBM3相互作用的序列。此外，我们将确定测序 RBM3介导的COX-2 mRNA稳定性所需的COX-2 3'UTR和 翻译。我们还将确定HUR和HNRNP-A1在此过程中的作用。在AIM 2中， 我们将确定经历磷酸化，泛素化和 诱变的sumoylation。我们还将确定突变体对 mRNA稳定性和翻译。在AIM 3中，我们建议通过 RBM3诱导肿瘤发生。我们将使用异种移植癌模型 确定MTOR和Notch途径在RBM3介导的肿瘤发生中的作用。还， 将确定microRNA在肿瘤发生中的作用。这些完成 实验应使我们更好地了解RNA结合蛋白 RBM3在正常上皮细胞中起作用，以及RBM3表达的变化 在肿瘤细胞中观察到的是肿瘤行为的原因。