CHARACTERIZATION OF DICER MRNA VARIANTS IN ORAL CANCER

口腔癌 DICER mRNA 变异的特征

• 批准号: 8360488
• 负责人: Andrew George Jakymiw
• 金额: $ 17.58万
• 依托单位: MEDICAL UNIVERSITY OF SOUTH CAROLINA
• 依托单位国家: 美国
• 财政年份: 2011
• 资助国家: 美国
• 起止时间: 2011-06-01 至 2012-09-04
• 项目状态: 已结题
• 来源: https://reporter.nih.gov/project-details/8360488
• 关键词: Address; Apoptosis; Biological; Biological Assay; Cancer Biology; Cell Line; Cell Proliferation; Cells; Centers of Research Excellence; Code; Data; Development; Disease Progression; Enzymes; Eukaryota; Funding; Genes; Grant; Human; Lead; Malignant Epithelial Cell; Messenger RNA; Metric; MicroRNAs; National Center for Research Resources; Oncogenic; Oral; Oral health; Pathway interactions; Pattern; Play; Principal Investigator; Property; RNA Interference; RNA Splicing; Relative (related person); Reporting; Research; Research Infrastructure; Resources; Ribonuclease III; Role; Source; South Carolina; Tissues; United States National Institutes of Health; Variant; cancer cell; cancer type; cell motility; cost; human DICER1 protein; insight; keratinocyte; mRNA Expression; malignant mouth neoplasm; mouth squamous cell carcinoma; overexpression; protein expression

This subproject is one of many research subprojects utilizing the resources provided by a Center grant funded by NIH/NCRR. Primary support for the subproject and the subproject's principal investigator may have been provided by other sources, including other NIH sources. The Total Cost listed for the subproject likely represents the estimated amount of Center infrastructure utilized by the subproject, not direct funding provided by the NCRR grant to the subproject or subproject staff. Dicer is a highly conserved RNase III type enzyme found in almost all eukaryotes that is essential for the RNA interference (RNAi) and microRNA pathways. During the last several years an increasing number of reports have found Dicer to be aberrantly expressed in different types of cancer, including oral squamous cell carcinomas (OSCCs). Recently, the dicer gene has been predicted to produce 11 mRNA splice variants bearing modified coding sequences. Our preliminary data suggests that one of these predicted Dicer mRNA splice variants is expressed in cells and appears to be upregulated in OSCC cell lines. Because the expression and function of the Dicer mRNA splice variants have not been well characterized and it currently remains unclear as to their biological significance, this proposal will explore the role of this particular Dicer mRNA splice variant in relation to oral cancer biology. Therefore, to better assess and correlate the expression patterns of the Dicer mRNA splice variant relative to OSCCs and disease progression this proposal will characterize its mRNA and protein expression levels in both OSCC cell lines and tissues ranging from dysplastic to invasive OSCCs in relation to non-cancerous counterparts. Furthermore, to enhance our understanding of the mechanisms regulating its aberrant expression this study will also analyze whether its aberrant expression in oral cancer cells is due to transcriptional and/or post-transcriptional regulatory mechanisms. Because the significance of the dysregulation of this splice variant in terms of cancer cell properties is not understood, this proposal will further seek to examine the biological effects of reducing the levels of the Dicer mRNA splice variant in oral cancer cells using RNAi knockdown strategies and analyze the effects of overexpressing it in both primary and immortalized human oral keratinocytes. The biological metrics will include cell proliferation, apoptosis, cell migration and invasion, and oncogenic transformation assays. By successfully addressing these specific aims this will lead to a better understanding of oral cancer biology. Furthermore, it will shed new insights into the function of Dicer mRNA splice variants and what roles they play in oral cancer development and progression.

该子项目是利用资源的众多研究子项目之一 由 NIH/NCRR 资助的中心拨款提供。子项目的主要支持 并且子项目的主要研究者可能是由其他来源提供的， 包括其他 NIH 来源。 子项目可能列出的总成本 代表子项目使用的中心基础设施的估计数量， NCRR 赠款不直接向子项目或子项目工作人员提供资金。 Dicer 是一种高度保守的 RNase III 型酶，几乎存在于所有真核生物中，对于 RNA 干扰 (RNAi) 和 microRNA 途径至关重要。 在过去的几年中，越来越多的报告发现 Dicer 在不同类型的癌症中异常表达，包括口腔鳞状细胞癌 (OSCC)。 最近，人们预测 dicer 基因会产生 11 个带有修饰编码序列的 mRNA 剪接变体。 我们的初步数据表明，这些预测的 Dicer mRNA 剪接变体之一在细胞中表达，并且似乎在 OSCC 细胞系中上调。 由于 Dicer mRNA 剪接变体的表达和功能尚未得到很好的表征，并且目前仍不清楚其生物学意义，因此本提案将探讨这种特定 Dicer mRNA 剪接变体在口腔癌生物学中的作用。 因此，为了更好地评估和关联 Dicer mRNA 剪接变体相对于 OSCC 和疾病进展的表达模式，本提案将表征其在 OSCC 细胞系和组织中的 mRNA 和蛋白质表达水平，范围从发育不良到侵袭性 OSCC 与非癌症对应物。 此外，为了增强我们对其异常表达调节机制的理解，本研究还将分析其在口腔癌细胞中的异常表达是否是由于转录和/或转录后调节机制所致。 由于这种剪接变体失调对癌细胞特性的重要性尚不清楚，因此该提案将进一步寻求使用RNAi敲低策略来检查降低口腔癌细胞中Dicer mRNA剪接变体水平的生物学效应，并分析在原代和永生化人类口腔角质形成细胞中过度表达它的影响。 生物学指标将包括细胞增殖、细胞凋亡、细胞迁移和侵袭以及致癌转化测定。 通过成功解决这些具体目标，这将有助于更好地了解口腔癌生物学。 此外，它将为 Dicer mRNA 剪接变体的功能及其在口腔癌发生和进展中发挥的作用提供新的见解。