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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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Stem Cell Culture01:17

Stem Cell Culture

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Stem cell research aims to find ways to use stem cells to regenerate and repair cellular damage. Over time, most adult cells undergo the wear and tear of aging and lose their ability to divide and repair themselves. Stem cells do not display a particular morphology or function. Adult stem cells, which exist as a small subset of cells in most tissues, keep dividing and can differentiate into a number of specialized cells generally formed by that tissue. These cells enable the body to renew and...
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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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Bone Marrow Sampling and Transplants01:22

Bone Marrow Sampling and Transplants

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Bone marrow transplant is a potential cure for several diseases, including cancer and specific genetic disorders. Notably, this procedure is applicable for patients suffering from aplastic anemia, certain types of leukemia, severe combined immunodeficiency disease (SCID), Hodgkin's disease, non-Hodgkin's lymphoma, multiple myeloma, thalassemia, sickle-cell disease, and certain cancers.
The transplant begins with high doses of chemotherapy and radiation treatment, which aim to destroy...
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Stem Cell Therapy for Tissue Regeneration01:21

Stem Cell Therapy for Tissue Regeneration

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Stem cell therapy is a method used in regenerative medicine to repair and restore function to damaged tissues and organs. Stem cells have the potential to proliferate and differentiate into various tissue types, making them ideal candidates for tissue regeneration. For example, hematopoietic stem cell transplants are commonly used in blood cancer treatment to replenish damaged bone marrow and restore healthy blood cells.
Types of Stem Cells used in Stem Cell Therapy
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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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Updated: Oct 31, 2025

Competitive Transplants to Evaluate Hematopoietic Stem Cell Fitness
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Hematopoietic Stem Cells: Uncomfortable Considerations.

P Quesenberry1, L Goldberg1, M Dooner2

  • 1Brown University/Rhode Island Hospital One Hoppin Street, Coro West 5, Providence, RI 02903, 401-444-4830.

Current Molecular Biology Reports
|July 1, 2021
PubMed
Summary
This summary is machine-generated.

Hematopoietic stem cells are dynamic and change phenotype, challenging current purification methods. This suggests distinct "emergency" and "baseline" modes of stem cell function in hematopoiesis.

Keywords:
Baseline Stem Cell BiologyHematopoietic NichesTransplant Stem Cell Biology

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Area of Science:

  • Hematology
  • Stem Cell Biology

Background:

  • Hematopoietic stem cells (HSCs) are crucial for blood cell production.
  • Current understanding of HSC biology may be limited by purification methods.

Purpose of the Study:

  • To redefine concepts of hematopoietic stem cell biology.
  • To investigate the dynamic nature of HSCs.

Main Methods:

  • Utilized three distinct experimental approaches.
  • Analyzed HSC phenotype and cell cycling.

Main Results:

  • Long-term repopulating HSCs are actively cycling and exhibit reversible phenotype changes.
  • Current epitope selection methods discard a significant portion of functional HSCs.
  • Studies on purified HSCs may not accurately reflect in vivo niche interactions.
  • Identified two distinct HSC functional modes: emergency and baseline.

Conclusions:

  • HSCs are not static and cannot be purified by current methods.
  • Baseline hematopoiesis relies on numerous short-lived clones.
  • The study proposes a new paradigm for HSC biology with two distinct modes.