Investigation of the role of Mind bomb in epithelial morphogenesis

心灵炸弹在上皮形态发生中作用的研究

• 批准号: 8711843
• 负责人: Miho Matsuda
• 金额: $ 3.52万
• 依托单位: RBHS-NEW JERSEY MEDICAL SCHOOL
• 依托单位国家: 美国
• 财政年份: 2010
• 资助国家: 美国
• 起止时间: 2010-09-01 至 2015-08-31
• 项目状态: 已结题
• 来源: https://reporter.nih.gov/project-details/8711843
• 关键词: Investigation; role; Mind; bomb; epithelial

Project Summary/Abstract Metastasis is a series of process that tumor cells lose their stationary epithelial characteristics and acquire migratory mesenchymal characteristics. Metastatic cancer that spread to multiple organs is a major cause of cancer mortality and morbidity. Thus, new rationally designed therapies are urgently needed to control, cure and prevent invasive cancers. Understanding the molecular mechanisms for the acquisition of highly invasive characteristics will contribute to developing new therapies for preventing and treating cancers. Growing evidence suggests that one of the critical signaling cascades for the acquisition of highly invasive characteristics is Notch signaling. Notch signaling plays a well-characterized role in cell fate specifications, stem cell renewals, and cell differentiation. However, the role in determining invasive cell characteristics remains poorly understood. Our long-term goal is to elucidate the molecular mechanisms by which Notch signaling and its modulators determines the invasive cell characteristics, thus serving as a necessary prerequisite to developing new therapeutic protocols for treating and preventing cancers. The hypothesis of our proposed research is that an essential modulator of Notch signaling, Mind bomb (Mib), plays a critical role in establishing and maintaining epithelial cell morphology not only by promoting Notch signaling but also by directly regulating epithelial cell polarity formation. The zebrafish is an excellent vertebrate model system to visualize the behavior of individual cells. In this study we use the zebrafish sensory organ, the posterior lateral line (pLL), as a model system to demonstrate these dual roles of Mib in epithelial morphogenesis. We based our hypothesis on the following observations that 1)mib mutants show aberrant epithelial morphogenesis, 2)embryos manipulated to loss of Notch activity show morphological defects, but do not completely phenocopy mib mutants, and 3)a Mib interacting protein, Epb4.1l5, regulates epithelial polarity formation. Based on these observations, the specific aims are to 1)define the Notch-dependent and independent function of Mib in pLL morphogenesis, and 2)characterize the molecular mechanism of Notch-independent Mib function in epithelial morphogenesis. More than 500,000 Americans lost their lives to metastatic cancer in 2008. In this proposed study, we use the zebrafish to understand the molecular mechanism of epithelial morphogenesis. The successful completion of our proposed research will be applicable to understanding molecular mechanisms by which stationary epithelial cells acquire the highly invasive cell characteristic in our bodies. It will lead to new therapies that effectively prevent and treat invasive cancers.

项目概要/摘要 转移是肿瘤细胞失去固定上皮的一系列过程 特征并获得迁移间充质特征。转移性癌症 扩散到多个器官是癌症死亡率和发病率的主要原因。因此，新 迫切需要合理设计的疗法来控制、治愈和预防侵袭性 癌症。了解获得高侵袭性的分子机制 这些特性将有助于开发预防和治疗癌症的新疗法。 越来越多的证据表明，获得高度信号的关键信号级联之一 侵入性特征是Notch信号传导。 Notch 信号在细胞中发挥着明确的作用 命运规范、干细胞更新和细胞分化。然而，在决定的作用 侵袭细胞的特征仍然知之甚少。我们的长期目标是阐明 Notch信号及其调节剂决定侵袭细胞的分子机制 特征，从而成为开发新治疗方案的必要先决条件 用于治疗和预防癌症。我们提出的研究的假设是 Notch 信号传导的重要调节剂 Mind Bomb (Mib) 在 建立和维持上皮细胞形态不仅通过促进Notch 信号传导还通过直接调节上皮细胞极性的形成。斑马鱼是一种 优秀的脊椎动物模型系统，可可视化单个细胞的行为。在本研究中我们使用 斑马鱼感觉器官，后侧线（pLL），作为模型系统来演示 Mib 在上皮形态发生中的双重作用。我们的假设基于以下内容 观察到 1)mib 突变体表现出异常的上皮形态发生，2) 胚胎被操纵 Notch活性丧失显示形态缺陷，但不完全表型mib 突变体，3) Mib 相互作用蛋白 Epb4.1l5 调节上皮极性形成。基于 这些观察结果，具体目标是1）定义Notch依赖和独立 Mib 在 pLL 形态发生中的功能，以及 2) 表征其分子机制 上皮形态发生中不依赖缺口的 Mib 功能。超过50万美国人 2008 年，他们死于转移性癌症。在这项拟议的研究中，我们使用斑马鱼 了解上皮形态发生的分子机制。顺利完成 我们提出的研究将适用于理解分子机制 静止的上皮细胞在我们体内获得了高度侵袭性的细胞特征。这将导致 有效预防和治疗侵袭性癌症的新疗法。