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Related Concept Videos

Hematopoiesis01:21

Hematopoiesis

8.1K
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

3.1K
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...
3.1K
Regulation of Hematopoietic Stem Cells01:01

Regulation of Hematopoietic Stem Cells

3.4K
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...
3.4K
Source And Potency Of Stem Cells01:27

Source And Potency Of Stem Cells

5.0K
Stem cells are undifferentiated cells with extensive self-renewal properties that help them maintain their population during the fetal and adult stages of life. They can specialize in all cell types of the human body. However, their differential potential may vary and can be classified into five types. Stem cells can be (1) Totipotent, (2) Pluripotent, (3) Multipotent, (4) Oligopotent, and (5) Unipotent. Each stem cell has a specific origin; the fertilized egg or zygote is a totipotent cell and...
5.0K
Overview of Hematopoiesis01:20

Overview of Hematopoiesis

9.8K
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...
9.8K
Production of Formed Elements01:34

Production of Formed Elements

7.5K
Hemangioblasts are multipotent stem cells originating from the mesoderm. They give rise to hematopoietic stem cells (HSCs), which undergo hematopoiesis to produce all the formed elements of blood. This process is regulated by a complex network of hematopoietic growth factors, including transcription factors, growth factors, and cytokines. These factors stimulate the HSCs to divide and differentiate, though some HSCs remain undifferentiated to maintain a self-renewing pool.
Most HSCs commit to...
7.5K

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Related Experiment Video

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Derivation of Hematopoietic Stem Cells from Murine Embryonic Stem Cells
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Derivation of Hematopoietic Stem Cells from Murine Embryonic Stem Cells

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Hematopoietic stem cells.

Robert G Hawley1, Ali Ramezani, Teresa S Hawley

  • 1Department of Anatomy and Cell Biology, The George Washington University Medical Center, Washington, DC, USA.

Methods in Enzymology
|December 5, 2006
PubMed
Summary

Researchers are exploring methods to identify and grow human hematopoietic stem cells (HSCs) in labs. While HSCs can renew themselves and create all blood cells, long-term cultivation remains a challenge.

Area of Science:

  • Hematology
  • Stem Cell Biology
  • Cellular Biology

Background:

  • Hematopoietic stem cells (HSCs) are crucial for blood cell formation, possessing self-renewal and differentiation capabilities.
  • Identifying and isolating human HSCs is vital for regenerative medicine and has been pursued for decades.
  • Current limitations hinder the continuous in vitro propagation of human HSCs, despite advances in enrichment.

Purpose of the Study:

  • To review current methodologies for phenotypically and functionally characterizing human HSCs.
  • To present initial research on establishing permanent human HSC cell lines.
  • To address the ongoing challenge of in vitro HSC expansion.

Main Methods:

  • Phenotypic characterization using cell surface markers.

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Hemogenic Endothelium Differentiation from Human Pluripotent Stem Cells in A Feeder- and Xeno-free Defined Condition
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  • Functional assays to assess HSC self-renewal and differentiation potential.
  • Exploration of conditions for long-term HSC culture and cell line derivation.

    • Main Results:

    • Established protocols for identifying and isolating candidate human HSCs.
    • Demonstrated initial progress in deriving cell lines with HSC characteristics.
    • Highlighted the persistent difficulties in achieving sustained in vitro HSC expansion.

    Conclusions:

    • Accurate characterization of human HSCs is essential for therapeutic applications.
    • Developing methods for continuous in vitro HSC propagation is a critical unmet need.
    • Ongoing research aims to overcome barriers to establishing permanent human HSC lines for research and clinical use.