Mechanosensitive determinants of podocyte physiology

足细胞生理学的机械敏感决定因素

基本信息

批准号：
10188521
负责人：
Evren U. AZELOGLU
金额：
$ 42.43万
依托单位：
ICAHN SCHOOL OF MEDICINE AT MOUNT SINAI
依托单位国家：
美国
项目类别：
财政年份：
2018
资助国家：
美国
起止时间：
2018-07-01 至 2023-04-30
项目状态：
已结题

来源：
https://reporter.nih.gov/project-details/10188521
关键词：
Ablation Actin-Binding Protein Actins Adhesions Adriamycin PFS Area Binding Biological Process Biology Biomechanics Biophysics Calcium Calcium Signaling Cardiac Cardiac Myocytes Cells Cellular Morphology Computer Models Confocal Microscopy Cytoskeleton Data Databases Diabetic Nephropathy Differential Equation Dilated Cardiomyopathy Disease Disease Progression Disease model Drug Targeting Environment Exhibits Family Filtration Focal Adhesions Focal Segmental Glomerulosclerosis Foot Process Functional disorder Generations Geometry Graph Health Heart Heart Abnormalities Heart Hypertrophy Hypertension Image In Situ In Vitro Injections Injury Kidney Kidney Diseases Knock-out Knockout Mice Lead Link LoxP-flanked allele Maintenance Maps Measures Mechanics Microfilaments Mining Modeling Molecular Morphology Mus Muscle Cells Muscle function Mutation Myocardium NPHS2 protein Neighborhoods Pathway Analysis Pathway interactions Patients Pharmaceutical Preparations Phenotype Physiological Physiology Plasma Play Process Protein Isoforms Proteins Proteinuria Proteomics Puromycin Rattus Resolution Role Scaffolding Protein Scanning Probe Microscopes Signal Transduction Skeletal Muscle Smooth Muscle Myocytes Speed Stimulus Stress Structure Surgical Clips System Testing Therapeutic Tissues base cell motility crosslink elastography experimental study glomerular function improved in silico in vivo knock-down knockout animal live cell imaging live cell microscopy mechanotransduction nebulette nebulin new therapeutic target novel podocyte pressure resilience response screening text searching therapeutic target

项目摘要

Project Summary Kidney podocytes operate under substantial biomechanical stress as part of their physiological function to filter plasma. They have a specialized dynamic actin cytoskeleton structure to reinforce the fragile foot process morphology that is required for their function. Using in vivo proteomic screening and mining of NephroSeq data, we have identified nebulette as a novel scaffolding protein that may play a role in organization and maintenance of the podocyte cytoskeleton and adhesion. Nebulette is an actin-binding protein expressed highly in the heart; mutations on its nebulin repeat domains have been linked to abnormal cardiac biomechanics and dilated cardiac hypertrophy. We hypothesize that nebulette plays a critical role in stability of actin filaments in kidney podocytes, increasing their biomechanical resilience against injury. We will test this hypothesis in vitro and in vivo using cultured primary podocytes and podocyte-specific nebulette knockout mice, respectively. We will use high-content imaging to characterize morphological changes associated with nebulette ablation and live-cell microscopy to determine its effects on cell motility and calcium dynamics. We will also quantitatively characterize cytoskeletal biomechanics using atomic force microscope elastography. We will then use proteomics and network analyses to construct a spatially specific partial differential equations- based dynamical model to quantify contribution of different biphysical components of nebulette in cytoskeletal stability and focal adhesion distribution and function. This in silico process will also identify likely drug targets that may modulate podocyte mechanobiology in a cell-specific manner. We will finally test the contribution of nebulette to in vivo podocyte physiology using two different disease models in podocyte-specific nebulette knockout mice. Through these experiments and computational modeling, we will thoroughly characterize the role of nebulette in glomerular physiology, and potentially identify novel pathways to modify biomechanical resilience of podocytes under healthy and disease conditions.

项目概要肾足细胞在巨大的生物力学压力下运作，作为其过滤生理功能的一部分等离子体。它们具有专门的动态肌动蛋白细胞骨架结构，可以强化脆弱的足突其功能所需的形态。利用体内蛋白质组筛选和 NephroSeq 数据挖掘，我们已经确定星云是一种新型支架蛋白，可能在组织和维持足细胞的细胞骨架和粘附。 Nebulette 是一种表达的肌动蛋白结合蛋白高度在心里；其星云蛋白重复结构域的突变与心脏异常有关生物力学和扩张的心脏肥大。我们假设星云在稳定性中起着至关重要的作用肾足细胞中的肌动蛋白丝，增加其抗损伤的生物力学弹性。我们将测试这个使用培养的原代足细胞和足细胞特异性星云敲除小鼠进行体外和体内假设，分别。我们将使用高内涵成像来表征与相关的形态变化星云消融和活细胞显微镜检查，以确定其对细胞运动和钙动力学的影响。我们还将使用原子力显微镜弹性成像定量表征细胞骨架生物力学。我们然后将使用蛋白质组学和网络分析来构建空间特定的偏微分方程 - 基于动力学模型来量化细胞骨架中星云不同双物理成分的贡献稳定性和粘着斑分布和功能。这种计算机模拟过程还将识别可能的药物靶点可能以细胞特异性方式调节足细胞力学生物学。我们最终将测试的贡献使用足细胞特异性星云中的两种不同疾病模型将星云与体内足细胞生理学联系起来基因敲除小鼠。通过这些实验和计算模型，我们将彻底表征星云在肾小球生理学中的作用，并可能确定改变生物力学的新途径足细胞在健康和疾病条件下的恢复能力。