Defining the First Hours of Lung metastasis using Intravital Live-Imaging

使用活体实时成像定义肺转移的最初几个小时

• 批准号: 8464682
• 负责人: MATTHEW F KRUMMEL
• 金额: $ 15.79万
• 依托单位: UNIVERSITY OF CALIFORNIA, SAN FRANCISCO
• 依托单位国家: 美国
• 财政年份: 2012
• 资助国家: 美国
• 起止时间: 2012-05-01 至 2014-04-30
• 项目状态: 已结题
• 来源: https://reporter.nih.gov/project-details/8464682
• 关键词: Accounting; Address; Air; Area; Behavior; Bone Marrow; Cell Communication; Cell Proliferation; Cell Survival; Cells; Cessation of life; Characteristics; Complex; Coupled; Deltastab; Development; Disease; Distal; Environment; Environmental air flow; Excision; Face; Goals; Grant; Hour; Human; Image; Imagery; Immune; Immune system; Immunologic Surveillance; Immunology; Individual; Interleukin-4; Investigation; Kinetics; Knowledge; Label; Lead; Life; Liquid substance; Liver; Lung; Malignant Neoplasms; Metastatic Neoplasm to the Lung; Methodology; Methods; Mus; National Institute of Allergy and Infectious Disease; Nature; Neoplasm Metastasis; Organ; Pathway interactions; Physiological; Population; Primary Neoplasm; Process; Proteins; Recruitment Activity; Relative (related person); Resolution; Risk; Role; Site; Skin; Specificity; Structure of parenchyma of lung; Techniques; Testing; Time; Tissues; base; cell motility; cell type; in vivo; innovation; intravital imaging; intravital microscopy; macrophage; multi-photon; neoplastic cell; novel; repaired; response; spatiotemporal; success; tumor

DESCRIPTION (provided by applicant): It is believed that the lung is a permissive organ for the seeding of certain metastasizing tumors. Recent studies have supported this, finding that distal primary tumors instigate bone marrow-derived cell (BMDC) migration into the lung, forming a pre-metastatic niche (PreMN), and that these cells are crucial for robust and efficient metastasis. These studies have led to a growing recognition of the importance of the immune system and the pulmonary PreMN in lung metastasis, but many important questions remain and have been hitherto inaccessible. Most notably, there has been no direct way of assessing the behavior and fate of DTCs within the lung PreMN versus normal 'less-permissive' lung tissue. Further, the PreMN contains a diverse set of immune cells and the effect of interaction with these populations on DTC survival is unknown. In order to understand and therapeutically target pulmonary metastasis we must first address these crucial questions, in vivo The basis for this R21 exploratory grant is to apply novel real-time intravital imaging approaches to understand how the lung deals with incoming cells. Of particular relevance are to understand why and how metastatic cells survive in the environment and how host-cells 'receive' them and protect them from normal elimination of cells from the vasculature. We hypothesize that normal removal of cells from microvasculature is a repair process which metastatic cells, helped by host cells, extend in duration to achieve successful colonization. The overall success of this project will be defined by our knowledge of the spatiotemporal landscape that metastatic cells face upon their arrival in the lung. Are tumor cells seeded followed by being joined by 'helper' host cells or are successful mets captured directly by these cells? What are the kinetics of the proliferation of incoming metastatic cells relative to the recruitment of macrophages and bone-marrow derived cells? In what way is this process accelerated by ongoing damage repair? Better understanding of this, along with the development of a method to study it, will permit much more rational approaches toward blocking tumor metastasis.

描述（由申请人提供）：据信肺是允许某些转移性肿瘤播种的器官。最近的研究支持了这一点，发现远端原发性肿瘤促使骨髓源性细胞（BMDC）迁移到肺部，形成转移前生态位（PreMN），并且这些细胞对于稳健和有效的转移至关重要。这些研究使人们越来越认识到免疫系统和肺 PreMN 在肺转移中的重要性，但许多重要的问题仍然存在并且迄今为止一直无法解决。最值得注意的是，目前还没有直接的方法来评估 PreMN 肺内 DTC 与正常“不太许可”肺组织的行为和命运。此外，PreMN 包含多种免疫细胞，与这些细胞群的相互作用对 DTC 存活的影响尚不清楚。为了了解并治疗肺转移，我们必须首先解决这些关键问题，在体内 这项 R21 探索性资助的基础是应用新型实时活体成像方法来了解肺部如何处理传入的细胞。特别重要的是了解转移细胞在环境中生存的原因和方式，以及宿主细胞如何“接收”它们并保护它们免遭脉管系统中细胞的正常清除。我们假设从微脉管系统中正常去除细胞是一个修复过程，转移细胞在宿主细胞的帮助下延长持续时间以实现成功定植。 该项目的总体成功将取决于我们对转移细胞到达肺部时所面临的时空景观的了解。肿瘤细胞是在接种后与“辅助”宿主细胞结合还是这些细胞直接捕获成功的mets？相对于巨噬细胞和骨髓来源细胞的募集，传入转移细胞的增殖动力学是什么？持续的损伤修复如何加速这一过程？更好地理解这一点，以及研究它的方法的发展，将允许采取更合理的方法来阻止肿瘤转移。