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相关概念视频

Overview of Hematopoiesis01:20

Overview of Hematopoiesis

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Hematopoiesis, or blood cell production, is a vital biological process that begins early in embryonic development and continues throughout life. This process generates the various types of cells found in blood, including red blood cells, white blood cells, and platelets from hematopoietic stem cells (HSCs).
Developmental Phases of Hematopoiesis
Initially, HSCs are formed in the embryonic yolk sac, a critical site for early blood cell production. These stem cells subsequently migrate to other...
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Hematopoiesis01:21

Hematopoiesis

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The process of blood cell formation is called hematopoiesis. Hematopoiesis starts early during development, on the seventh day of embryogenesis. This phase of hematopoiesis is called the primitive wave, wherein the extraembryonic yolk sac allows the production of erythroid cells and endothelial cells from a common precursor called hemangioblast. The erythroid cells provide oxygen to support the growth of the rapidly dividing embryo. Hemangioblasts later develop into hematopoietic stem cells or...
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Multipotency of Hematopoietic Stem Cells01:19

Multipotency of Hematopoietic Stem Cells

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The hematopoietic stem cells or HSCs are multipotent, meaning they can differentiate and give rise to all blood and immune cells. HSCs are maintained in the quiescent stage until an external stimulus initiates their differentiation. The multipotent HSCs exist as two heterogeneous populations, long-term repopulating cells (LTRC) and short-term repopulating cells (STRC). The two HSC populations have different surface markers or receptors and are classified based on quiescence and long-term...
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Bone Marrow Sampling and Transplants01:22

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Bone marrow transplant is a potential cure for several diseases, including cancer and specific genetic disorders. Notably, this procedure is applicable for patients suffering from aplastic anemia, certain types of leukemia, severe combined immunodeficiency disease (SCID), Hodgkin's disease, non-Hodgkin's lymphoma, multiple myeloma, thalassemia, sickle-cell disease, and certain cancers.
The transplant begins with high doses of chemotherapy and radiation treatment, which aim to destroy...
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Regulation of Hematopoietic Stem Cells01:01

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All blood and immune cells are produced from the multipotent hematopoietic stem cells (HSCs) by the process of hematopoiesis. However, they all have a limited life span. In addition, many are depleted in immune surveillance or combatting an injury or infection. This makes blood one of the most regenerative tissues. Hematopoiesis helps replenish these blood and immune cells, restoring the body's normal functioning. However, overproduction of blood and immune cells can make them cancerous or...
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Lineage Commitment01:21

Lineage Commitment

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Commitment is the  process whereby stem cells:
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Author Spotlight: Analyzing Bone Marrow Microenvironment in Murine Hematological Malignancies
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骨髓造血导致多发性硬化症的进展

Kaibin Shi1, Handong Li2, Ting Chang3

  • 1Department of Neurology, Institute of Neuroimmunology, Tianjin Medical University General Hospital, Tianjin 300052, China; Center for Neurological Diseases, China National Clinical Research Center for Neurological Diseases, Beijing Tiantan Hospital, Capital Medical University, Beijing 100070, China.

Cell
|June 16, 2022
PubMed
概括

在多发性硬化症 (MS) 中,骨髓干细胞转向髓状细胞的产生,增加进入中枢神经系统 (CNS) 的炎症细胞. 针对骨髓可能为MS提供新的治疗方法.

关键词:
自主反应的T细胞骨髓 骨髓多发性硬化症骨髓形成神经炎症

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科学领域:

  • 免疫学
  • 神经科学
  • 血液学

背景情况:

  • 多发性硬化 (MS) 是一种影响中枢神经系统 (CNS) 的T细胞介导的自身免疫性疾病.
  • 骨髓造血干细胞和前代细胞 (HSPC) 在MS病变发生过程中的作用尚不清楚.
  • 已知HSPCs对免疫激活有反应.

研究的目的:

  • 研究多发性硬化症患者自身反应性T细胞和骨髓HSPC之间的相互作用.
  • 探索导致MS患者骨髓异常形成的机制.
  • 确定向骨髓是否会影响MS中枢神经系统的炎症.

主要方法:

  • 在多发性硬化患者中分析HSPC血统倾斜和T细胞扩张.
  • 在实验性自身免疫脑膜炎 (EAE) 中的谱系追踪,MS的小鼠模型.
  • 在骨髓中研究细胞迁移途径 (例如CXCR4) 和信号轴 (例如CCL5-CCR5).

主要成果:

  • 多发性硬化症患者的骨髓HSPC显示骨髓血统偏差与克隆T细胞扩张.
  • EAE小鼠表现出骨髓骨质形成的增加,产生质细胞和透到中枢神经系统的Ly6Chigh单细胞.
  • 骨髓反应性T细胞通过CXCR4迁移到骨髓,CCL5-CCR5轴驱动骨髓形成,加剧中枢神经系统的炎症和脱髓化.

结论:

  • 由T细胞相互作用驱动的异常骨髓形成,有助于MS中枢神经系统病理.
  • 骨髓在MS的发病过程中起着至关重要的作用.
  • 针对骨髓微环境为MS和其他自身免疫性疾病提供了潜在的治疗策略.