Towards Understanding Molecular Mechanisms of Human Hematopoietic Stem Cells' Quiescence

理解人类造血干细胞静止的分子机制

• 批准号: 10570203
• 负责人: SAGHI GHAFFARI
• 金额: $ 33.8万
• 依托单位: ICAHN SCHOOL OF MEDICINE AT MOUNT SINAI
• 依托单位国家: 美国
• 财政年份: 2022
• 资助国家: 美国
• 起止时间: 2022-02-15 至 2025-01-31
• 项目状态: 未结题
• 来源: https://reporter.nih.gov/project-details/10570203
• 关键词: Age; Autophagocytosis; Blood; Cell Cycle; Cell Surface Receptors; Cell Therapy; Cells; Clinic; Communication; Disease; Foundations; Generations; Genomics; Goals; Health; Hematopoietic Stem Cell Transplantation; Hematopoietic Stem Cell subsets; Hematopoietic stem cells; Homeostasis; Human; Image; Injury; Intervention; Life; Link; Longevity; Lysosomes; Maintenance; Malignant Neoplasms; Mediating; Membrane Potentials; Metabolic stress; Mitochondria; Molecular; Mus; Organelles; Output; Pathway interactions; Phenotype; Pluripotent Stem Cells; Process; Property; Recycling; Regulation; Surface; Testing; Time; Tissues; Translations; Transplantation; Work; adult stem cell; design; hematopoietic stem cell fate; hematopoietic stem cell quiescence; improved; in vivo; mitochondrial membrane; novel; novel strategies; programs; repaired; response; self-renewal; stem cell engraftment; stem cell function; stem cell therapy; stem cells; stem-like cell; success; therapy resistant

SUMMARY/ABSTRACT Hematopoietic stem cells (HSCs) produce all blood lineages and replenish blood in response to loss or injury throughout life. HSCs like most adult stem cells, are mainly quiescent. Quiescence is proposed to protect HSCs from replicative and metabolic stress that would otherwise impact health and longevity, thereby enabling them to maintain tissue homeostasis and allowing for the repair of defective/damaged tissue during their lifetime. Progress in HSC-based therapies is partly hindered by lack of reliable approaches to modulate HSC quiescence and activity. Thus, understanding the core molecular mechanisms of HSC quiescence is fundamental for improving HSC health and longevity and has major translational implications for the clinic. By applying a new approach based on mitochondrial membrane potential (MMP), we identified the most dormant subsets of both human and mouse HSCs. Using this approach, we recently discovered that lysosomal activity is pivotal for the maintenance of mouse HSC quiescence. Our findings suggest that lysosomes dynamically regulate the hematopoietic stem cell switch between quiescent and active states. Here, we propose to investigate lysosomal function and the effects of modulation of lysosomal activity on the potency of human HSCs. These studies are likely to provide means towards extending the availability of human HSCs. Overall, translation of our findings to human HSCs will build the foundation towards advancing cell therapy.

摘要/摘要 造血干细胞（HSC）产生所有血统，并以损失或损伤的响应来补充血液 一生。与大多数成年干细胞一样，HSC主要是静止的。提出静止以保护 复制和代谢压力的HSC，否则会影响健康和寿命 使它们能够维持组织稳态，并允许修复有缺陷/受损的组织 他们的一生。基于HSC的疗法的进展部分受到缺乏可靠的调制方法的阻碍 HSC静止和活动。因此，了解HSC静止的核心分子机制是 改善HSC健康和寿命的基础，并对诊所具有重大的翻译意义。 通过采用基于线粒体膜电位（MMP）的新方法，我们确定了最多的方法 人类和小鼠HSC的休眠子集。使用这种方法，我们最近发现 溶酶体活性是维持小鼠HSC静止的关键。我们的发现表明 溶酶体在静态状态和活性状态之间动态调节造血干细胞开关。 在这里，我们建议研究溶酶体功能以及调节溶酶体活性对 人类HSC的效力。这些研究可能提供了扩展可用性的手段 人类HSC。总体而言，将我们的发现转化为人类HSC将为前进的基础奠定基础 细胞疗法。