Substrate-mediated collective cell migration in calvarial bone expansion and disease

颅骨扩张和疾病中基质介导的集体细胞迁移

基本信息

批准号：
10427074
负责人：
RADHIKA P ATIT
金额：
$ 57.08万
依托单位：
CASE WESTERN RESERVE UNIVERSITY
依托单位国家：
美国
项目类别：
财政年份：
2021
资助国家：
美国
起止时间：
2021-08-03 至 2024-07-31
项目状态：
已结题

来源：
https://reporter.nih.gov/project-details/10427074
关键词：
Adhesions Affect Animal Disease Models Animal Model Apert syndrome Apical Biological Assay Bone Development Bone Growth Brain Calvaria Cells Cephalic Collection Congenital Abnormality Congenital abnormal Synostosis Coupled Craniosynostosis Cues Data Defect Dependence Development Differentiation and Growth Disease Dysmorphology Dysplasia Embryo Etiology Exhibits Extracellular Matrix Extracellular Protein Fibronectins Gene Expression Genetic Genetic Models Genetic Predisposition to Disease Growth Human Image Laboratories Live Birth Measures Mediating Mesenchyme Modeling Modification Morphogenesis Mus Mutant Strains Mice Operative Surgical Procedures Organ Osteoblasts Osteogenesis Outcome Pathology Pathway interactions Patients Pattern Phenotype Population Positioning Attribute Proteins Regulation Role Sensory Structure of fontanel of skull Substrate Interaction Surgical sutures Testing Variant Vertebrates Zebrafish base bone cell motility clinically relevant coronal suture craniofacial craniofacial disorder cranium differential expression dosage experimental study extracellular human model in vivo in vivo Model live cell imaging migration mouse development mouse genetics mouse model mutant new therapeutic target novel organ growth overexpression progenitor protein expression remediation response stem cells suture fusion targeted treatment therapy development tool treatment strategy

项目摘要

Summary Congenital defects affecting the formation of the skull roof, such as craniosynostosis or persistent fontanelles, occur as a result of abnormal calvarial growth and differentiation. We lack a basic understanding of how calvarial bones grow, which in turn impacts the position, patterning, and fusion of sutures. The Harris and Atit laboratories recently uncovered an unexpected and intriguing role for cellular sensing of graded fibronectin matrix in preferentially regulating apical expansion of calvarial progenitors during mouse development. When cellular lamellipodia are inhibited, mouse calvarial osteoblasts fail to appropriately migrate resembling defects seen when we conditionally delete fibronectin. These findings are bolstered by data that fibronectin is misregulated in patients with craniosynostosis as well as animal models of this disease. We propose that graded fibronectin may act as a substrate for coordinated migration of calvarial osteoblast progenitors over the skull roof. Our central hypothesis is that calvarial growth and suture patency are dependent on fibronectin-directed calvarial progenitor cell expansion. Through three focused mechanistic and translational aims, we will directly test this model and hypothesis of fibronectin substrate-mediated migration underlying a diverse number of suture pathologies. First, we will assess outcomes of altered fibronectin expression in regulation of calvarial growth. Second, using newly established genetic lines in mouse and zebrafish, we will test the dependence on fibronectin adhesion and the role of lamellipodia-dependent cellular sensing of an extracellular gradient in apical expansion of calvaria. Third, we will capitalize on both patient and mouse models of craniosynostosis to assess commonality of fibronectin disruption in clinically relevant dysmorphologies and whether decreasing fibronectin expression rescues craniosynostosis in zebrafish and mouse models in vivo. Our unique genetic tools in both mouse and zebrafish will allow us to define the function of fibronectin guided lamellipodia-based collective cell movement in vivo during calvarial bone expansion and the impact of fibronectin deficiency on suture patency. Results from these studies will help detail the substrate-mediated cell migration of osteoblast progenitors and will lead to new strategies for targeted therapies of calvarial bone defects and craniofacial disorders.

概括影响颅顶形成的先天性缺陷，例如颅缝早闭或持续性囟门，由于颅骨生长和分化异常而发生。我们对颅骨如何形成缺乏基本的了解骨骼生长，进而影响缝合线的位置、图案和融合。哈里斯和阿蒂特实验室最近发现分级纤连蛋白基质的细胞传感具有意想不到的有趣作用在小鼠发育过程中优先调节颅骨祖细胞的顶端扩张。当蜂窝板状伪足受到抑制，小鼠颅骨成骨细胞无法适当迁移，类似于当我们有条件地删除纤连蛋白。这些发现得到了纤连蛋白在颅缝早闭患者以及该疾病的动物模型。我们建议分级纤连蛋白可能作为颅骨成骨细胞祖细胞在颅骨顶部协调迁移的基质。我们的中央假设颅骨生长和缝线通畅取决于纤连蛋白引导的颅骨祖细胞扩增。通过三个重点机械和转化目标，我们将直接测试这一点不同数量缝合线下纤连蛋白底物介导的迁移的模型和假设病理学。首先，我们将评估纤连蛋白表达改变在颅骨生长调节中的结果。其次，使用小鼠和斑马鱼中新建立的遗传系，我们将测试对纤连蛋白的依赖性粘附和片状伪足依赖性细胞传感细胞外梯度在顶端扩张中的作用卡尔瓦里亚。第三，我们将利用患者和小鼠的颅缝早闭模型来评估共性临床相关畸形中纤连蛋白破坏的影响以及是否降低纤连蛋白表达在体内挽救斑马鱼和小鼠模型中的颅缝早闭。我们在小鼠和小鼠中独特的遗传工具斑马鱼将使我们能够定义纤连蛋白引导的基于片状伪足的集体细胞运动的功能颅骨骨扩张过程中的体内情况以及纤连蛋白缺乏对缝合线通畅的影响。结果来自这些研究将有助于详细说明底物介导的成骨细胞祖细胞迁移，并将导致新的发现颅骨骨缺损和颅面疾病的靶向治疗策略。