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Related Concept Videos

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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Lineage Commitment01:21

Lineage Commitment

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Commitment is the  process whereby stem cells:
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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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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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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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Retroviral Infection of Murine Embryonic Stem Cell Derived Embryoid Body Cells for Analysis of Hematopoietic Differentiation
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Regulation of HSC development and function by Lin28b.

Grant Cox1, Michihiro Kobayashi2, Brian D Rudd3

  • 1Department of Neurology, University of Washington, Seattle, WA, United States.

Frontiers in Cell and Developmental Biology
|March 27, 2025
PubMed
Summary

The RNA binding protein Lin28b is crucial for hematopoietic stem cell (HSC) development, regulating the switch from fetal to adult HSCs. Understanding Lin28b

Keywords:
HMGA2HSC expansionIGF2BP2LIN28BLet7fetal and adult hematopoietic stem cells

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Area of Science:

  • Developmental biology
  • Hematopoiesis
  • Molecular biology

Background:

  • Hematopoietic stem cells (HSCs) are essential for lifelong blood cell production and self-renewal.
  • Fetal HSCs exhibit distinct characteristics and immune cell production compared to adult HSCs.
  • The transition from fetal to adult HSCs is a critical developmental process.

Purpose of the Study:

  • To review the role of the RNA binding protein Lin28b in regulating HSC expansion and differentiation during early life.
  • To explore how Lin28b influences the developmental switch from fetal to adult HSCs.
  • To provide insights for ex vivo HSC expansion strategies.

Main Methods:

  • Literature review of studies on Lin28b and HSC development.
  • Analysis of gene expression patterns and surface markers of fetal and adult HSCs.
  • Examination of the regulatory mechanisms of Lin28b in hematopoietic stem and progenitor cells (HSPCs).

Main Results:

  • Lin28b is predominantly expressed in fetal HSPCs and drives the developmental trajectory of HSCs.
  • Lin28b regulates the expansion and differentiation of HSCs during early development.
  • Distinctive transcriptomes and surface markers characterize fetal HSCs influenced by Lin28b.

Conclusions:

  • Lin28b is a key regulator of the transition from fetal to adult HSCs.
  • Understanding Lin28b's function is vital for manipulating HSC behavior.
  • Insights into Lin28b's role can inform ex vivo HSC expansion techniques.