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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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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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Autophagy is a self-digesting process by which a cell protects itself from threats both within and outside the cell, ranging from abnormal proteins to invading bacteria. In this process, obsolete components of the cell and invading microbes are degraded by hydrolytic enzymes active in an acidic environment of the lysosomal lumen.
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Eukaryotic cells use different mechanisms to eliminate toxic waste obsolete and worn-out substances. Lysosomes play a pivotal role in this, and hence, these substances are carried to the lysosome from other parts of the cell and extracellular space through different pathways. The most elaborately studied pathways to the lysosome are the endocytic pathways.
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The Spindle Assembly Checkpoint02:19

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The spindle assembly checkpoint is a molecular surveillance mechanism ensuring the fidelity of chromosome segregation during anaphase. The checkpoint monitors the completion of all the prerequisite steps before chromosome segregation to determine whether the segregation process should proceed or be delayed.
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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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Updated: Nov 21, 2025

A Culture Method to Maintain Quiescent Human Hematopoietic Stem Cells
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Chaperone-mediated autophagy sustains haematopoietic stem-cell function.

Shuxian Dong1,2, Qian Wang1,2,3, Yun-Ruei Kao3

  • 1Department of Development and Molecular Biology, Albert Einstein College of Medicine, New York, NY, USA.

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Chaperone-mediated autophagy (CMA) sustains hematopoietic stem cell (HSC) function by maintaining protein quality and metabolism. Activating CMA can restore function in aged HSCs, suggesting therapeutic potential.

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Area of Science:

  • Hematology
  • Cellular Biology
  • Molecular Biology

Background:

  • Hematopoietic stem cells (HSCs) must activate from quiescence for lifelong blood cell production.
  • The molecular mechanisms governing HSC activation, reprogramming, and return to quiescence are not fully understood.
  • Stem cell function is critical for maintaining health and can decline with age.

Purpose of the Study:

  • To investigate the role of chaperone-mediated autophagy (CMA) in maintaining hematopoietic stem cell (HSC) function.
  • To determine if CMA is involved in protein quality control and metabolic adaptation during HSC activation.
  • To explore the potential of CMA modulation as a therapeutic strategy for age-related HSC dysfunction.

Main Methods:

  • Studied chaperone-mediated autophagy (CMA) in adult mouse hematopoietic stem cells (HSCs).
  • Assessed the impact of CMA on protein quality control and fatty acid metabolism upon HSC activation.
  • Investigated CMA activity in aged HSCs and tested genetic or pharmacological activation strategies.

Main Results:

  • Chaperone-mediated autophagy (CMA) is essential for sustaining hematopoietic stem cell (HSC) function in adult mice.
  • CMA facilitates protein quality control and upregulates fatty acid metabolism during HSC activation.
  • CMA activity declines with age, but its activation can restore function in aged mouse and human HSCs.

Conclusions:

  • Chaperone-mediated autophagy (CMA) plays a crucial role in maintaining long-term HSC function through quality control and energy metabolism.
  • CMA activation holds promise as a therapeutic target for improving HSC function in aging and stem cell transplantation contexts.