Liver Sinusoidal Endothelial Cell Progenitor Cells (sprocs) and Chronic Liver Disease

肝窦内皮细胞祖细胞 (sprocs) 与慢性肝病

• 批准号: 9884512
• 负责人: LAURIE D DELEVE
• 金额: $ 37.13万
• 依托单位: UNIVERSITY OF SOUTHERN CALIFORNIA
• 依托单位国家: 美国
• 财政年份: 2014
• 资助国家: 美国
• 起止时间: 2014-08-01 至 2023-12-31
• 项目状态: 已结题
• 来源: https://reporter.nih.gov/project-details/9884512
• 关键词: Acute; Advanced Glycosylation End Products; Blood; Blood Circulation; Bone Marrow; Cardiovascular Diseases; Cell Differentiation process; Cell Maturation; Cells; Cerebrovascular Disorders; Cirrhosis; Confocal Microscopy; Cytometry; Data; Development; Diabetes Mellitus; Differentiation Antigens; Elements; Endothelial Cells; Exposure to; Expression Profiling; Fatty Liver; Fibrosis; Fluorescence; Future; Goals; Hepatic Stellate Cell; Hepatocyte; Hyperlipidemia; Immunohistochemistry; Impairment; In Situ Hybridization; In Vitro; Injury; Intervention; Lead; Ligands; Lipids; Liver; Liver Regeneration; Liver diseases; Location; Metabolic syndrome; Minor; Modeling; Molecular; Normal Cell; Obesity; Partial Hepatectomy; Pathologic Processes; Pathway interactions; Patients; Phenotype; Physiological; Physiology; Play; Population; Proteins; Proteomics; Rattus; Risk; Role; Serum; Signal Pathway; Signal Transduction; Source; Stream; Therapeutic; Thioacetamide; Tissues; cardiovascular risk factor; cell type; cerebrovascular; chronic liver disease; chronic liver injury; endothelial stem cell; functional disability; in vivo; intrahepatic; liver injury; liver repair; mortality; non-alcoholic fatty liver disease; novel; novel strategies; novel therapeutic intervention; oxidized low density lipoprotein; prevent; progenitor; receptor mediated endocytosis; recruit; repaired; self-renewal; single-cell RNA sequencing; stem cell niche; stem cells; uptake

PROJECT SUMMARY The hypothesis for aim 1 is that resident sprocs are the source of liver sinusoidal endothelial cells (LSECs) during normal turnover and that resident sprocs reside in a stem cell niche that promotes their quiescence. Aim 1 will use lineage-tracing to determine whether LSECs are derived from resident sprocs, will characterize LSECs and resident sprocs in-depth to identify cell differentiation markers and lineage markers to determine whether LSECs share common origins with other liver cells, will identify signaling pathways known to respond to known stem cell niche ligands, and will characterize the various ligands and cellular elements that compose the stem cell niche for sprocs. The hypothesis for aim 2 is that changes particular to the metabolic syndrome suppress the NO pathway in LSECs and induce capillarization. This aim will characterize the signaling in NAFLD in isolated LSECs in vitro and in LSECs isolated from NAFLD ex vivo. The hypothesis for aim 3 is that the impaired endocytotic function of BM-derived (“capillarized”) LSECs contributes to aberrant clearance of lipids in NAFLD. Aim 3 will examine uptake of lipids in LSECs taken from rats with NAFLD and will use intravital multiphoton fluorescence confocal microscopy to examine lipid uptake in vivo in rats with NAFLD. Interventions will be used to induce maturation of BM-derived LSECs and studies will examine the effect of this on in vitro and in vivo uptake of lipid. Finally the effect of inducing maturation of BM- derived LSECs on serum lipid level will be compared with the effect of a statin. Collectively, these aims will provide a major advance in our understanding of the role of resident sprocs in liver physiology, which will be critical for future approaches to elicit a greater contribution from resident sprocs to the repair of liver injury and to drive liver regeneration. These studies also have the potential to uncover the mechanisms leading to capillarization in NAFLD as a prelude to providing therapeutic strategies to prevent two consequences of capillarization: the contribution of capillarization to hyperlipidemia and the loss of the ability to suppress hepatic stellate cell activation. Finally, these studies should uncover an important mechanism that contributes to elevated lipid levels in NAFLD with its attendant increased risk of cardiovascular mortality and that may lead to novel approaches to treat this aspect of hyperlipidemia.

项目摘要 目标1的假设是居民Sproc是肝脏正弦内皮细胞（LSEC）的来源。 在正常的周转率和居民sproc的过程中，位于促进其静止的干细胞生态位。目的 1将使用谱系追踪来确定LSEC是否来自居民，将表征 LSEC和居民深入识别细胞分化标记和谱系标记以确定 LSEC是否与其他肝细胞共同起源，将识别已知可以响应的信号通路 与已知的干细胞小裂配体，并将表征组成的各种配体和细胞元素 Sprocs的干细胞生态位。 AIM 2的假设是，代谢综合征的特殊变化抑制了NO途径 LSEC并诱导毛细管化。这个目标将表征NAFLD中孤立的LSEC在体外中的信号传导 并在从nafld ex vivo中分离出来的LSEC中。 目标3的假设是BM衍生（“毛细管”）LSEC的内吞作用受损 导致NAFLD中脂质的异常清除。 AIM 3将检查LSEC中脂质的摄取 带有NAFLD的大鼠，将使用插入式多光子荧光共聚焦显微镜检查脂质摄取 带有Nafld的大鼠体内。干预措施将用于诱导BM衍生的LSEC的成熟，研究将 检查它对体外和体内脂质摄取的影响。最后，BM-诱导成熟的影响 将在血清脂质水平上衍生的LSEC与他汀类药物的作用进行比较。 总的来说，这些目标将在我们理解居民在肝脏中的作用方面有一个重大进步 生理学，这对于将来的方法至关重要 修复肝损伤并驱动肝脏再生。这些研究也有可能发现 导致NAFLD毛细管化的机制，作为提供治疗策略的序幕，以防止两种 毛细管的后果：毛细血管对高脂血症的贡献以及失去能力 抑制肝星状细胞活化。最后，这些研究应该发现一个重要的机制 NAFLD的脂质水平升高，其随之而来的是增加心血管死亡率的风险 这可能会导致治疗高脂血症这一方面的新方法。