Viscotaxis: Novel cell migration mechanisms regulated by microenvironmental viscosity

Viscotaxis：微环境粘度调节的新型细胞迁移机制

• 批准号: 10379292
• 负责人: Konstantinos Konstantopoulos
• 金额: $ 46.44万
• 依托单位: JOHNS HOPKINS UNIVERSITY
• 依托单位国家: 美国
• 财政年份: 2021
• 资助国家: 美国
• 起止时间: 2021-04-01 至 2026-03-31
• 项目状态: 未结题
• 来源: https://reporter.nih.gov/project-details/10379292
• 关键词: 1-Phosphatidylinositol 3-Kinase; 3-Dimensional; Actins; Actomyosin; Acute; Affect; Anterior; Biological Assay; Biomedical Engineering; Biophysics; Blood; Breast Cancer Cell; Breast Cancer cell line; Breast cancer metastasis; Cancerous; Cations; Cell Volumes; Cell membrane; Cells; Complement; Cytoplasm; Cytoskeleton; Data; Distant; Elements; Epithelial Cells; Equilibrium; Event; Exhibits; Exposure to; Extracellular Matrix; Extracellular Matrix Degradation; Feedback; Fiber; Focal Adhesions; Goals; Growth; Human body; Image; Imaging Device; In Vitro; Injections; Integrins; Intercellular Fluid; Intuition; Ion Channel; Ions; Light; Liquid substance; Lung; Mechanics; Mediating; Memory; Migration Assay; Modeling; Motion; Motor; Mucins; Mus; Neoplasm Metastasis; Neoplasm Transplantation; Nuclear Translocation; Optics; Organ; Organoids; Patients; Pattern; Physiological; Plasma; Primary Neoplasm; Process; Prognostic Marker; Proteins; Publishing; Regulation; Resolution; Role; Signal Transduction; Site; Speed; Stretching; Sum; Survival Analysis; Swelling; Tail; Testing; Tissues; Travel; Veins; Viscosity; Water; Zebrafish; breast cancer survival; cancer cell; cell motility; chloride-cotransporter potassium; confocal imaging; extracellular; in vivo; in vivo Model; interdisciplinary approach; interstitial; macromolecule; malignant breast neoplasm; mammary; mechanotransduction; member; migration; mouse model; multiphoton microscopy; neoplastic cell; new therapeutic target; novel; particle; patient derived xenograft model; preconditioning; receptor; triple-negative invasive breast carcinoma; tumor

Cell motility is a key step in the metastatic cascade of events, as it enables cancerous cells dissociating from a primary tumor to navigate through interstitial tissues and ultimately colonize distant organs. Cell locomotion is governed by cell-matrix interactions, the actomyosin cytoskeleton, and cell volume regulation via the involvement of ion transporters, such as the Na+/H+ exchanger 1 (NHE1). To date, most cell motility assays are performed in medium with a viscosity close to that of water (0.77 cP). However, the viscosity of the interstitial fluid varies up to 2-3 cP, and can be further augmented by the presence of macromolecules secreted not only by resident epithelial cells in various tissues but also by tumor cells. Cancer cell plasticity is a key feature in metastasis, as tumor cells need to adapt to and navigate through diverse tissue microenvironments presenting different stiffness, degrees of confinement, viscosity and extracellular matrix (ECM) composition. It is currently unknown how tumor cells sense and respond to (patho)physiologically relevant levels of viscosity. The overarching goal of this project is to employ a multidisciplinary approach involving state-of-the-art bioengineering and imaging tools, quantitative analysis and in vivo models to elucidate the effects of extracellular viscosity on breast cancer cell migration, invasion and metastasis. This application will test the hypothesis, supported by intriguing preliminary data, that elevated extracellular viscosity (≥3cP) promotes NHE1-dependent cell swelling, which triggers the activation of the mechanosensitive ion channel TRPV4, thereby initiating downstream signaling. In Aim 1a, we will establish that TRPV4 is the key mechanosensor of elevated viscosity, which initiates RhoA activation, and delineate the presence of a potential feedback loop between NHE1-dependent TRPV4 activation and RhoA. In Aim 1b, we will demonstrate that the coordinated action of local isosmotic swelling at the leading edge and shrinkage at the trailing edge mediated by NHE1 and potassium-chloride cotransporter 4, KCC4, respectively, supports confined migration at elevated viscosities. Cells, as active mechanical objects upon sensing elevated extracellular viscosity, respond by balancing forces in the cell cytoplasm with those in the extracellular microenvironment, thus resulting in increased cytoskeletal tension, higher RhoA-dependent cell contractility and actin reorganization, which ultimately precipitate nuclear translocation of YAP (Aim 1c). We will characterize the roles of viscosity-sensing mechanisms in discrete steps of metastatic dissemination in a live zebrafish model that affords the unique advantages of optical transparency and exceptionally high-resolution along with high-speed imaging of transplanted tumor cells (Aim 2a). We will complement these studies with mouse models to characterize the localization patterns and functional roles of TRPV4, NHE1, KCC4 and YAP in cell migration in natural mammary tissue tracks in vivo (Aim 2b) and in breast cancer growth and metastasis (Aim 2c), using triple-negative breast cancer cell lines and patient-derived xenografts (PDXs). In sum, this project will define how cells sense and respond to extracellular viscosity and identify novel targets to reduce metastasis.

细胞运动是一系列转移性事件中的关键步骤，因为它使癌细胞 从原发肿瘤中分离出来，穿过间质组织，最终定居在远处的器官。 细胞运动受细胞-基质相互作用、肌动蛋白细胞骨架和细胞体积调节的控制。 通过离子转运体的参与，如Na+/H+交换器1(NHE1)。迄今为止，大多数细胞的运动性 分析是在粘度接近水(0.77 CP)的介质中进行的。然而，该产品的粘度 间质液体的变化可达2-3cp，并可通过分泌的大分子进一步增加。 不仅存在于各种组织中的上皮细胞，也存在于肿瘤细胞中。癌细胞的可塑性是一个关键特征 在转移中，由于肿瘤细胞需要适应和导航呈现的不同组织微环境 不同的硬度、约束程度、粘度和细胞外基质(ECM)组成。它目前是 未知的肿瘤细胞如何感知和反应(病理)生理相关的粘度水平。这个 该项目的总体目标是采用涉及最先进生物工程的多学科方法。 以及成像工具、定量分析和体内模型来阐明细胞外粘度对 乳腺癌细胞的迁移、侵袭和转移。这个应用程序将测试该假设，支持 耐人寻味的初步数据是，细胞外粘度(≥3cP)的升高促进了依赖NHE1的细胞肿胀， 它触发机械敏感离子通道TRPV4的激活，从而启动下游 发信号。在目标1a中，我们将确定TRPV4是提高粘度的关键机械传感器，它启动了 RhoA激活，并描绘了依赖NHE1的TRPV4之间存在潜在的反馈环 激活和RhoA。在目标1b中，我们将证明局部等渗膨胀的协调作用 NHE1和氯化钾共转运体4介导的前沿和后缘收缩， KCC4分别支持粘度较高时的受限迁移。细胞，作为活动的机械对象 感觉到细胞外粘度的增加，通过平衡细胞质中的力量和细胞内的力量来做出反应 细胞外微环境，从而导致细胞骨架张力增加，细胞对RhoA的依赖性更高 收缩和肌动蛋白重组，最终导致YAP的核转位(目标1c)。我们会 描述黏度感应机制在肝转移扩散离散步骤中的作用 斑马鱼模型，提供独特的光学透明度和极高分辨率优势 以及移植肿瘤细胞的高速成像(目标2a)。我们将对这些研究进行补充 小鼠模型研究TRPV4、NHE1、KCC4和YAP在脑内的定位模式和功能 细胞在体内天然乳腺组织中的迁移(Aim 2b)以及乳腺癌生长和转移中的细胞迁移 (AIM 2c)，使用三阴性乳腺癌细胞系和患者来源的异种移植(PDX)。总而言之，这个项目 将定义细胞如何感知和响应细胞外黏度，并确定减少转移的新靶点。