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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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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,...
4.1K
Multipotency of Hematopoietic Stem Cells01:19

Multipotency of Hematopoietic Stem Cells

4.0K
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...
4.0K
Hematopoiesis01:21

Hematopoiesis

9.3K
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...
9.3K
M-Cdk Drives Transition Into Mitosis02:15

M-Cdk Drives Transition Into Mitosis

6.7K
Checkpoints throughout the cell cycle serve as safeguards and gatekeepers, allowing the cell cycle to progress in favorable conditions and slow or halt it in problematic ones. This regulation is known as the cell cycle control system.
Cyclin-dependent kinases, or Cdks, work in concert with cyclins to control cell cycle transitions. M-Cdk, a complex of Cdk1 bound to M cyclin, is a well-known example of this coordinated control that drives the transition from the G2 to the M phase.
M cyclin...
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Inhibition of Cdk Activity02:34

Inhibition of Cdk Activity

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The orderly progression of the cell cycle depends on the activation of Cdk protein by binding to its cyclin partner. However, the cell cycle must be restricted when undergoing abnormal changes. Most cancers correlate to the deregulated cell cycle, and since Cdks are a central component of the cell cycle, Cdk inhibitors are extensively studied to develop anticancer agents. For instance, cyclin D associates with several Cdks, such as Cdk 4/6, to form an active complex. The cyclin D-Cdk4/6 complex...
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PDK1 plays a vital role on hematopoietic stem cell function.

Tianyuan Hu1,2, Cong Li1,3, Le Wang1

  • 1State Key Laboratory of Experimental Hematology, Institute of Hematology and Blood Diseases Hospital, and Center for Stem Cell Medicine, Chinese Academy of Medical Sciences and Peking Union Medical College, Tianjin, China.

Scientific Reports
|July 12, 2017
PubMed
Summary

3-Phosphoinositide-dependent protein kinase 1 (PDK1) is crucial for hematopoietic stem cell (HSC) function and development. Loss of PDK1 impairs HSCs, highlighting its dominant role in regulating HSCs, partly through reactive oxygen species (ROS) levels.

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Phenotypic Analysis and Isolation of Murine Hematopoietic Stem Cells and Lineage-committed Progenitors
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Area of Science:

  • Hematology
  • Molecular Biology
  • Cell Signaling

Background:

  • 3-Phosphoinositide-dependent protein kinase 1 (PDK1) is a key regulator of the PI3K-Akt pathway.
  • PDK1 influences B and T cell development but its role in hematopoietic stem cells (HSCs) is unclear.

Purpose of the Study:

  • To investigate the specific role of PDK1 in HSC function and hematopoiesis.
  • To determine PDK1's contribution to HSC lineage commitment and self-renewal.

Main Methods:

  • Genetic deletion of the PDK1 gene in the hematopoietic system of mice.
  • Analysis of HSC function, lineage commitment, quiescence, and reconstitution potential.
  • Assessment of reactive oxygen species (ROS) levels and their modulation.

Main Results:

  • PDK1-deficient HSCs showed impaired function, defective lineage commitment, and reduced quiescence.
  • Loss of PDK1 led to an increase in phenotypic HSCs but a decrease in progenitors, with failed hematopoietic reconstitution.
  • HSC function was more dependent on PDK1 than mTORC2, indicating PDK1's dominant role in Akt-mediated regulation.
  • PDK1 deficiency reduced ROS levels; L-butathioninesulfoximine treatment restored ROS and promoted colony formation.

Conclusions:

  • PDK1 is essential for maintaining HSC function, self-renewal, and proper lineage commitment.
  • PDK1 plays a dominant role in Akt-mediated HSC regulation, surpassing mTORC2's influence.
  • PDK1 contributes to HSC function, in part, by regulating intracellular ROS levels.