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Multipotency of Hematopoietic Stem Cells

Multipotency of Hematopoietic Stem Cells

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...

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...

Hematopoiesis

Hematopoiesis

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...

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.
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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).
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Stem Cell Therapy for Tissue Regeneration

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Related Experiment Video

Updated: May 19, 2026

Ex Vivo Expansion of Hematopoietic Stem Cells from Human Umbilical Cord Blood-derived CD34+ Cells Using Valproic Acid

Ex Vivo Expansion of Hematopoietic Stem Cells from Human Umbilical Cord Blood-derived CD34⁺ Cells Using Valproic Acid

Published on: April 11, 2019

Hematopoietic stem cell expansion: challenges and opportunities.

Marta A Walasek¹, Ronald van Os, Gerald de Haan

¹Department of Biology of Aging, Section Stem Cell Biology, European Research Institute for the Biology of Aging, University Medical Center Groningen, University of Groningen, Groningen, the Netherlands.

Annals of the New York Academy of Sciences

|August 21, 2012

Summary

Improving hematopoietic stem and progenitor cell (HSPC) expansion ex vivo is challenging. Recent research explores novel factors to control HSPC fate and enhance stem cell amplification for better reconstitution potential.

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Ex Vivo Expansion of Hematopoietic Stem Cells from Human Umbilical Cord Blood-derived CD34+ Cells Using Valproic Acid

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Published on: April 11, 2019

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Ex Vivo Expansion and Genetic Manipulation of Mouse Hematopoietic Stem Cells in Polyvinyl Alcohol-Based Cultures

Ex Vivo Expansion and Genetic Manipulation of Mouse Hematopoietic Stem Cells in Polyvinyl Alcohol-Based Cultures

Published on: February 10, 2023

Area of Science:

Hematology
Stem Cell Biology
Cell Culture

Background:

Ex vivo expansion of hematopoietic stem and progenitor cells (HSPCs) for improved engraftment has faced challenges.
Key limitations include insufficient stem cell numbers and excessive differentiation during culture.
Current cytokine-based protocols struggle to maintain the self-renewal of immature stem cells.

Purpose of the Study:

To review the difficulties in ex vivo HSPC expansion.
To highlight recent advancements in controlling HSPC fate in vitro.
To discuss novel factors influencing stem cell self-renewal and amplification.

Main Methods:

Review of early and recent scientific literature on ex vivo stem cell expansion.
Analysis of factors affecting hematopoietic stem cell (HSC) self-renewal and differentiation.
Examination of extrinsic control mechanisms for HSPC fate in vitro.

Main Results:

Traditional cytokine-based methods are insufficient for amplifying immature stem cells.
Novel developmental factors and chemical compounds show promise in enhancing HSC self-renewal.
Progress has been made in understanding extrinsic control of HSPC fate.

Conclusions:

Effective ex vivo expansion requires novel strategies beyond standard cytokines.
Identifying and utilizing extrinsic factors is crucial for successful stem cell amplification.
Further research into these factors may lead to improved cell therapies.