Microenvironmental Control of Liver Progenitor Cell Differentiation and Spatial Patterning

肝祖细胞分化和空间模式的微环境控制

• 批准号: 10220587
• 负责人: Gregory H Underhill
• 金额: $ 48.43万
• 依托单位: UNIVERSITY OF ILLINOIS AT URBANA-CHAMPAIGN
• 依托单位国家: 美国
• 财政年份: 2021
• 资助国家: 美国
• 起止时间: 2021-04-15 至 2025-03-31
• 项目状态: 未结题
• 来源: https://reporter.nih.gov/project-details/10220587
• 关键词: 3-Dimensional; Address; Adult; Anatomy; Animal Model; Biliary; Biochemical; Biological; Biological Models; Biomechanics; Cell Communication; Cell Culture System; Cell Culture Techniques; Cell Differentiation process; Cells; Chronic; Communication; Cues; Degenerative Disorder; Development; Developmental Process; Dimensions; Disease; Duct (organ) structure; Embryonic Development; Engineering; Epithelial Cells; Exhibits; Functional disorder; Geometry; Goals; Hepatocyte; Human; Individual; Injury; Intrahepatic bile duct; Investigation; Ligands; Link; Liver; Liver Regeneration; Liver diseases; Malignant Neoplasms; Malignant neoplasm of liver; Maps; Mechanical Stress; Mechanics; Mesenchyme; Modeling; Morphogenesis; Natural regeneration; Nature; Notch Signaling Pathway; Pattern; Play; Portal vein structure; Process; Reaction; Regulation; Research; Research Personnel; Role; Signal Pathway; Signal Transduction; Structure; Technology; Testing; Tissue Engineering; Tissues; Work; bile duct; bile formation; cell fate specification; cholangiocyte; combinatorial; design; differentiation protocol; disease mechanisms study; drug testing; experience; experimental study; in vitro Model; induced pluripotent stem cell; insight; jagged1 protein; liver development; notch protein; novel; novel strategies; novel therapeutics; progenitor; response; single-cell RNA sequencing; stem cell differentiation; stem cell function; stem cells; therapeutic development; tool; two-dimensional

Project Summary The bipotential differentiation of liver progenitor cells to hepatocytes and biliary epithelial cells (cholangiocytes) is integral to liver development, regeneration, and diseases including bile duct paucity and liver cancer. In particular, the most common congenital liver diseases are associated with bile duct dysfunction. In addition to the developmental processes during embryogenesis, duct morphogenesis also occurs in the adult liver in response to severe and chronic injury. These so-called ductular reactions exhibit highly variable differentiation patterns, and although these reactions significantly contribute to the proliferative responses in the liver, they remain poorly characterized. Notably, ductular proliferations in the adult liver are concentrated near the portal vein region, similar to the formation of bile ducts during development. Despite substantial research efforts, the structural complexity and dynamic nature of liver development and regeneration has limited the comprehensive understanding of disease mechanisms as well as the advancement of new therapeutic options. The long-term goal of this project is to develop complementary two-dimensional and three-dimensional engineered tissue platforms that can be applied towards the investigation of liver progenitor cell differentiation mechanisms that are presently inaccessible with current cell culture systems and animal models. Towards this end, we will pursue the following research objectives, which are specifically targeted towards deconstructing the combined influence of biochemical and biomechanical signals in liver progenitor cell fate specification. In Aim 1, we will utilize a cell microarray platform to investigate the influence of spatial gradients of Notch signaling and cell mechanical stresses in progenitor cell differentiation. Our approach will enable the independent control of cell- cell interactions, defined by multicellular geometry, and specific exogenous microenvironmental signals presented within the array platform. In Aim 2, we will develop and utilize a three-dimensional microtissue culture platform to systematically investigate the effects of three-dimensional geometry and determine how distinct multicellular geometries regulate differentiation patterns. These research efforts will establish microscale tissue engineering tools that enable the controlled presentation and systematic perturbation of a range of microenvironmental signals. In Aim 3, we will extend our studies towards the direct analysis of human liver differentiation mechanisms through the integration of human induced pluripotent stem (iPS) cell-derived liver progenitor cells. Collectively, our approach will allow for novel studies into the mechanisms of liver progenitor cell differentiation, including the unique examination of the combinatorial influence of cell mechanical stress gradients and Notch signaling. Further, we envision that these platforms are generalizable, and could be implemented as enabling technologies for fundamental biological investigation and therapeutic development efforts for a broad range of cell and tissue contexts.

项目摘要 肝祖细胞向肝细胞和胆管上皮细胞(胆管细胞)的双向分化 是肝脏发育、再生以及胆管缺乏和肝癌等疾病不可或缺的一部分。在……里面 特别是，最常见的先天性肝病与胆管功能障碍有关。除了……之外 在胚胎发生、导管形态发生的发育过程中，成年大鼠肝脏也发生了这种情况。 对严重和慢性伤害的反应。这些所谓的导管反应表现出高度不同的分化 模式，虽然这些反应对肝脏的增殖反应有很大贡献，但它们 仍然没有很好的特征。值得注意的是，成人肝脏中的管状增殖集中在门脉附近。 静脉区，类似于发育过程中胆管的形成。尽管做了大量的研究工作，但 肝脏发育和再生的结构复杂性和动态性限制了全面的 对疾病机制的理解以及新治疗方案的进步。长期的 该项目的目标是开发互补的二维和三维工程组织 可应用于研究肝祖细胞分化机制的平台 目前用目前的细胞培养系统和动物模型是无法获得的。为此，我们将 追求以下研究目标，这些目标专门针对解构合并的 生化和生物力学信号对肝祖细胞命运的影响。在目标1中，我们将 利用细胞微阵列平台研究Notch信号和细胞的空间梯度的影响 祖细胞分化中的机械应力。我们的方法将使细胞能够独立控制- 由多细胞几何形状和特定的外源微环境信号定义的细胞相互作用 在阵列平台内呈现。在目标2中，我们将开发和利用一种三维微组织 为系统研究三维几何的影响并确定如何 不同的多细胞几何形状调节分化模式。这些研究工作将建立 微尺度组织工程工具，使受控的呈现和系统的扰动 微环境信号的范围。在目标3中，我们将把研究扩展到对人类的直接分析 整合人诱导多能干细胞(IPS)诱导的肝脏分化机制 肝祖细胞。总的来说，我们的方法将使对肝脏机制的新研究成为可能。 祖细胞分化，包括对细胞组合影响的独特检查 机械应力梯度和缺口信号。此外，我们设想这些平台是可推广的， 并可实现为基础生物研究和治疗的使能技术 在广泛的细胞和组织背景下的开发工作。