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相关概念视频

Regulation of Hematopoietic Stem Cells01:01

Regulation of Hematopoietic Stem Cells

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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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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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Role of Hematopoietic Growth Factors01:28

Role of Hematopoietic Growth Factors

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Hematopoietic growth factors are molecules that regulate the differentiation rate of hematopoietic stem cells (HSCs). Erythropoietin (EPO), primarily produced by the kidneys, plays a crucial role in erythrocyte production. When oxygen levels in the blood are low, EPO is released into the bloodstream, reaching the bone marrow, where it stimulates HSCs to differentiate and mature into erythrocytes, which are vital for oxygen transport.
Thrombopoietin (TPO), mainly released by the liver,...
1.2K
Structure and Function of Platelets01:18

Structure and Function of Platelets

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The cell fragments known as platelets are disc-shaped, with an average diameter of about 3 μm and a thickness of roughly 1 μm. They play a crucial role in the body's vascular clotting system, which also involves plasma proteins, blood cells, and blood vessel tissues.
Platelets are continually replenished, circulating in the bloodstream for 9-12 days before being removed by phagocytes, primarily in the spleen. A microliter of circulating blood contains between 150,000 and 450,000...
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Hematopoiesis01:21

Hematopoiesis

5.1K
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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Formation of the Platelet Plug01:22

Formation of the Platelet Plug

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The platelet phase, the second stage of hemostasis, commences around 15-20 seconds after an injury. It follows and overlaps with the vascular phase, during which blood vessels constrict to minimize blood loss.
As the injured blood vessel contracts, endothelial cells undergo contraction, revealing collagen fibers in the basement membrane and underlying connective tissue. Furthermore, the plasma membrane of endothelial cells becomes adhesive, preparing the site for platelet adhesion. Platelets...
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相关实验视频

Updated: Jun 5, 2025

Pan-myeloid Differentiation of Human Cord Blood Derived CD34+ Hematopoietic Stem and Progenitor Cells
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血小板因子4 (PF4) 调节血造干细胞衰老

Sen Zhang, Charles E Ayemoba, Anna M Di Staulo

    bioRxiv : the preprint server for biology
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    概括

    老化的骨髓干细胞 (HSC) 可以通过血小板素因子4 (PF4) 恢复青春. 恢复PF4水平可以逆转与年龄相关的HSC功能障碍,为造血性疾病提供新的治疗途径.

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    科学领域:

    • 血液学 血液学 血液学
    • 干细胞生物学 干细胞生物学
    • 衰老研究研究 衰老研究

    背景情况:

    • 造血干细胞 (HSC) 和它们的骨髓经历与年龄相关的变化.
    • 这些变化会损害免疫功能,增加对血液癌症的易感性.
    • 巨核细胞和血小板因子4 (PF4) 都与HSC衰老有关.

    研究的目的:

    • 调查巨核细胞和PF4在HSC衰老中的作用.
    • 为了确定PF4是否可以逆转与年龄相关的HSC功能障碍.
    • 为了确定介导PF4对HSCs影响的受体.

    主要方法:

    • 研究了缺乏PF4的小鼠,表现出加速的HSC衰老表型.
    • 给老年小鼠和评估的HSC功能进行了再组合PF4的使用.
    • 使用淘汰模式,在HSC上确定了LDLR和CXCR3作为PF4受体.
    • 评估了人类的HSC对PF4信号的反应.

    主要成果:

    • PF4 缺乏模仿了加速的 HSC 衰老,导致淋巴缺血和髓质偏差.
    • 重组PF4恢复了老年HSC到年轻的状态,改善了极性并减少了DNA损伤.
    • PF4增强了HSCs的体内溶解能力和平衡的血统输出.
    • 证实了LDLR和CXCR3是HSC中PF4信号的关键受体.
    • 人类HSC对PF4产生了积极的反应,这表明保持了再生潜力.

    结论:

    • 巨核细胞利基与年龄相关的衰退和PF4是HSC衰老的关键驱动因素.
    • 补充PF4通过通过LDLR和CXCR3进行信号,使老年HSC复苏3.
    • 向PF4为治疗与年龄相关的造血性疾病提供了一个有希望的策略.