Defining key differences in mouse fibroblasts during digit regeneration and fibrosis

定义小鼠成纤维细胞在手指再生和纤维化过程中的关键差异

• 批准号: 10602674
• 负责人: Vivian Jou
• 金额: $ 3.72万
• 依托单位: HARVARD UNIVERSITY
• 依托单位国家: 美国
• 财政年份: 2023
• 资助国家: 美国
• 起止时间: 2023-07-01 至 2025-06-30
• 项目状态: 未结题
• 来源: https://reporter.nih.gov/project-details/10602674
• 关键词: Address; Alleles; Amputation; Automobile Driving; Bar Codes; Behavior; Biological Assay; Biological Models; Biological Process; Candidate Disease Gene; Cell Lineage; Cells; Cellular Structures; Chromosome Mapping; Clinical Treatment; Clustered Regularly Interspaced Short Palindromic Repeats; Complex; DNA; Data; Digit structure; Distal; Doxycycline; Electroporation; Fibroblasts; Fibrosis; Gene Delivery; Gene Expression; Genes; Genetic; Genetically Engineered Mouse; Homeostasis; Human; Hydrogels; Knowledge; Mammals; Modeling; Molecular; Mus; Nail plate; Natural regeneration; Persons; Plasmids; Play; Population; Population Dynamics; Population Heterogeneity; Process; Protein Secretion; Research; Resolution; Role; Sepharose; Source; Survival Rate; System; Techniques; Testing; Tissues; blastema; cell type; design; differential expression; digit regeneration; driving force; effective therapy; experimental study; high throughput screening; improved; in vivo; insight; knock-down; limb amputation; overexpression; regenerative; repaired; response; single-cell RNA sequencing; small hairpin RNA; tissue regeneration; tool; transcriptomics; wound; wound healing

PROJECT SUMMARY Composite tissue regeneration is very limited in mammals; however, humans and mice can fully regenerate the distal tips of the digits following amputation. This process involves the formation of a blastema, a cellular structure that is the source of the regenerated tissue and is integral to successful regeneration. Proximal amputations beyond the nail do not form a blastema and result in fibrotic wound-healing. This differential behavior makes the mouse digit tip an ideal model system to investigate the cellular and molecular factors driving each wound-healing response and why complex regeneration is so limited in mammals. Specifically, this project will focus on fibroblast subtypes and their role in fibrosis versus regeneration. Fibroblasts are a major contributor to the blastema and play an integral part in fibrosis; thus, they may be a cell population that drives the decision between fibrosis and regeneration. Our single cell transcriptomic (scRNA-seq) analysis of the regenerating blastema revealed an extremely heterogenous fibroblast population and that the subpopulations had distinct population dynamics and lineage trajectories during blastema formation and maturation. I hypothesize that there are specific fibroblast subtypes that promote regeneration, inhibit fibrosis, or both. However, no studies have performed direct lineage contributions by tracing fibroblast subpopulations in regeneration and fibrosis. Additionally, the in vivo functional roles and importance of our computationally defined candidate pro-regenerative genes have not been established. This project will utilize single-cell CRISPR based DNA barcoding for lineage tracing fibroblasts at the subtype resolution (Aim 1) and plasmid electroporation for gene delivery to functionally assess candidate pro-regenerative genes (Aim 2). Together, my two aims will provide important insight into how the fibrotic and regenerative processes are determined in the mouse digit tip and will open additional avenues for more effective clinical treatments for large wounds or amputations in humans.

项目摘要 哺乳动物的复合组织再生非常有限。但是，人类和小鼠可以完全再生 截肢后数字的远端尖端。此过程涉及形成Blastema，一个细胞 结构是再生组织的来源，是成功再生不可或缺的一部分。近端 指甲以外的截肢不会形成胚芽，并导致纤维化伤口愈合。这种差异 行为使小鼠数字尖端成为研究细胞和分子因子的理想模型系统 驱动每种伤口治疗反应，以及为什么复杂的再生在哺乳动物中如此受到限制。具体来说， 该项目将集中于成纤维细胞亚型及其在纤维化与再生中的作用。成纤维细胞为a 玻璃体的主要贡献者并在纤维化中起着不可或缺的作用；因此，它们可能是细胞人群 这推动了纤维化和再生之间的决定。我们的单细胞转录组（SCRNA-SEQ） 对再生胚乳的分析显示，具有极为异质的成纤维细胞群体，并且 亚群在胚芽形成期间具有不同的种群动态和谱系轨迹 成熟。我假设有特定的成纤维细胞亚型可以促进再生，抑制 纤维化，或两者兼而有之。但是，没有通过追踪成纤维细胞进行直接谱系贡献 再生和纤维化的亚群。此外，我们的体内功能角色和我们的重要性 尚未建立计算定义的候选促进基因。这个项目将利用 基于单细胞CRISPR的DNA条形码，用于在亚型分辨率下谱系跟踪成纤维细胞（AIM 1） 和用于基因递送的质粒电穿孔，以在功能上评估候选促进基因（AIM 2）。共同，我的两个目标将为纤维化和再生过程如何提供重要的见解 在小鼠数字尖端确定，将开放其他途径，以进行更有效的临床治疗 人类的大伤口或截肢。