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Related Concept Videos

Blood Flow01:29

Blood Flow

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Blood is pumped by the heart into the aorta, the largest artery in the body, and then into increasingly smaller arteries, arterioles, and capillaries. The velocity of blood flow decreases with increased cross-sectional blood vessel area. As blood returns to the heart through venules and veins, its velocity increases. The movement of blood is encouraged by smooth muscle in the vessel walls, the movement of skeletal muscle surrounding the vessels, and one-way valves that prevent backflow.
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Hematopoiesis01:21

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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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Overview of Hematopoiesis01:20

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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).
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Production of Formed Elements01:34

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Hemangioblasts are multipotent stem cells originating from the mesoderm. They give rise to hematopoietic stem cells (HSCs), which undergo hematopoiesis to produce all the formed elements of blood. This process is regulated by a complex network of hematopoietic growth factors, including transcription factors, growth factors, and cytokines. These factors stimulate the HSCs to divide and differentiate, though some HSCs remain undifferentiated to maintain a self-renewing pool.
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Blood is circulated throughout the human body through a network of blood vessels called the circulatory system. This system includes arteries that transport blood from the heart to various body parts. These arterial pathways divide into smaller vessels until they reach the arterioles, which further split into capillaries. It is within these minuscule capillaries that the exchange of nutrients and waste products takes place. After this exchange, the blood is collected by venules, which fuse to...
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The development of the vascular system in a fetus is a complex and intricate process that begins as early as 15 to 16 days post-conception. This process starts outside the embryo, specifically in the mesoderm of the yolk sac, chorion, and connecting stalk. Approximately two days later, the formation of blood vessels occurs within the embryo itself.
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Hematopoietic stem cell development is dependent on blood flow.

Trista E North1, Wolfram Goessling, Marian Peeters

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Blood flow is a conserved regulator of hematopoietic stem cell (HSC) formation during vertebrate embryogenesis. Nitric oxide (NO) acts as a downstream mediator, crucial for HSC development in the aorta-gonads-mesonephros region.

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Area of Science:

  • Developmental Biology
  • Hematopoiesis
  • Vascular Biology

Background:

  • Hematopoietic stem cells (HSCs) are essential for blood formation and originate in the aorta-gonads-mesonephros (AGM) region during vertebrate embryogenesis.
  • The precise regulatory mechanisms governing HSC emergence in the AGM remain an active area of research.

Purpose of the Study:

  • To investigate the role of blood flow as a conserved regulator of HSC formation.
  • To identify downstream signaling pathways involved in flow-mediated HSC development.

Main Methods:

  • Utilized zebrafish models with chemical blood flow modulators and genetic mutations affecting circulation (silent heart mutants).
  • Administered nitric oxide (NO) donors and employed morpholino knockdown of nos1 (nnos/enos) in zebrafish.
  • Examined mouse models with intrauterine NO inhibition and embryonic Nos3 deficiency.

Main Results:

  • Zebrafish embryos with impaired blood flow exhibited significantly reduced HSCs.
  • NO donors rescued HSC development in flow-impaired zebrafish, even when administered before circulation onset.
  • Nos1 knockdown in zebrafish was cell-autonomous, and Nos3 deficiency in mice reduced hematopoietic clusters and transplantable HSCs.

Conclusions:

  • Blood flow is a conserved regulator of HSC development in the AGM region.
  • Nitric oxide (NO) is a key downstream mediator in the blood flow-dependent regulation of HSC formation.
  • This study establishes a direct link between vascular dynamics and the earliest stages of hematopoiesis.