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Related Concept Videos

Regulation of Hematopoietic Stem Cells01:01

Regulation of Hematopoietic Stem Cells

3.5K
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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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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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,...
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Multipotency of Hematopoietic Stem Cells01:19

Multipotency of Hematopoietic Stem Cells

3.5K
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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Lineage Commitment01:21

Lineage Commitment

3.6K
Commitment is the  process whereby stem cells:
3.6K
Overview of Hematopoiesis01:20

Overview of Hematopoiesis

5.7K
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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Related Experiment Video

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Phenotypic Analysis and Isolation of Murine Hematopoietic Stem Cells and Lineage-committed Progenitors
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Dopamine signaling regulates hematopoietic stem and progenitor cell function.

Yang Liu1,2, Qi Chen1,2, Hyun-Woo Jeong1,2

  • 1Department of Tissue Morphogenesis, Max Planck Institute for Molecular Biomedicine, Muenster, Germany.

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Dopamine directly regulates hematopoietic stem and progenitor cell (HSPC) function via D2 receptors. This discovery offers new therapeutic avenues for bone marrow (BM) transplantation and regenerative medicine.

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Phenotypic Analysis and Isolation of Murine Hematopoietic Stem Cells and Lineage-committed Progenitors
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Pan-myeloid Differentiation of Human Cord Blood Derived CD34+ Hematopoietic Stem and Progenitor Cells
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Directed Differentiation of Primitive and Definitive Hematopoietic Progenitors from Human Pluripotent Stem Cells
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Area of Science:

  • Hematology
  • Neuroscience
  • Stem Cell Biology

Background:

  • Bone marrow (BM) hematopoietic stem and progenitor cell (HSPC) function is regulated by complex stroma-derived signals.
  • The precise identity and interaction of these signaling molecules remain largely unknown.

Purpose of the Study:

  • To investigate the direct role of sympathetic nerve-derived dopamine in controlling HSPC behavior.
  • To elucidate the molecular mechanisms underlying dopamine's regulation of HSPCs.

Main Methods:

  • Pharmacological and genetic blockade of dopamine synthesis and D2 subfamily dopamine receptors.
  • Administration of a D2-type receptor agonist.
  • Analysis of HSPC frequency, proliferation, and BM transplantation efficiency.
  • Investigation of Lck expression and MAPK-mediated signaling.

Main Results:

  • Dopamine directly controls HSPC behavior through D2 subfamily dopamine receptors.
  • Inhibition of dopamine synthesis or D2 receptor function reduced HSPC frequency, proliferation, and BM transplantation efficiency.
  • D2-type receptor agonist treatment enhanced BM regeneration and transplantation efficiency.
  • Dopamine regulates Lck expression, impacting stem cell factor-induced MAPK signaling in HSPCs.

Conclusions:

  • Dopamine plays a critical functional role in regulating hematopoietic stem and progenitor cells.
  • This finding reveals a novel neuro-immune-hematopoietic axis.
  • The study suggests potential therapeutic strategies for enhancing bone marrow transplantation and regenerative processes.