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Regulation of Hematopoietic Stem Cells

Regulation of Hematopoietic Stem Cells

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...

Lineage Commitment

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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...

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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Hematopoiesis

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Differentiation of Common Myeloid Progenitor Cells

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Common myeloid progenitors (CMPs) are oligopotent cells that can differentiate into granulocytes and macrophages. Granulocytes and macrophages are essential for protecting the body against bacterial, viral, or fungal infections. They migrate from the bone marrow into the circulating blood to reach specific tissue sites where they differentiate and help in immune surveillance. However, they survive only for a few days and must be continuously made available to the organism to maintain a robust...

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Related Experiment Video

Updated: May 20, 2026

Pan-myeloid Differentiation of Human Cord Blood Derived CD34+ Hematopoietic Stem and Progenitor Cells

Pan-myeloid Differentiation of Human Cord Blood Derived CD34⁺ Hematopoietic Stem and Progenitor Cells

Published on: August 9, 2019

PDCD2 controls hematopoietic stem cell differentiation during development.

Joseph Kramer¹, Celine J Granier, Stephani Davis

¹Department of Medicine, University of Medicine and Dentistry of New Jersey-Robert Wood Johnson Medical School, New Brunswick, New Jersey, USA

Stem Cells and Development

|July 18, 2012

Summary

This summary is machine-generated.

Programmed cell death 2 (Pdcd2) is crucial for embryonic hematopoietic development. Loss of Pdcd2 disrupts hematopoietic stem cell emergence and differentiation, impacting blood formation.

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Retroviral Infection of Murine Embryonic Stem Cell Derived Embryoid Body Cells for Analysis of Hematopoietic Differentiation

Retroviral Infection of Murine Embryonic Stem Cell Derived Embryoid Body Cells for Analysis of Hematopoietic Differentiation

Published on: October 20, 2014

Area of Science:

Developmental Biology
Hematopoiesis
Cell Death

Background:

Programmed cell death 2 (Pdcd2) is a conserved protein with unknown functions.
Pdcd2 knockout in mice is embryonic lethal, and its Drosophila ortholog is vital for lymph gland development, suggesting a role in hematopoiesis.

Purpose of the Study:

To investigate the function of pdcd2 in zebrafish hematopoietic development.
To elucidate the molecular mechanisms underlying pdcd2's role in hematopoiesis.

Main Methods:

Genetic and functional studies in zebrafish embryos.
Knockdown of pdcd2 expression.
Analysis of hematopoietic progenitor and stem cell populations.
Investigation of cell-autonomous effects and p53 independence.
Assessment of mitotic defects and apoptosis.
Rescue experiments involving runx1 and Jak/Stat signaling.

Main Results:

Pdcd2 knockdown caused defects in embryonic hematopoietic development, including increased progenitor markers and erythroid progenitor accumulation.
Hematopoietic stem cells (HSCs) failed to emerge and differentiate, with loss of pdcd2 function linked to mitotic defects and apoptosis.
runx1 restoration and Jak/Stat signaling inhibition rescued the observed hematopoietic defects.

Conclusions:

Pdcd2 plays a critical role in regulating the transcriptional hierarchy for hematopoietic lineage determination.
Pdcd2's regulation of mitotic cell death contributes to its function in directing hematopoietic differentiation during development.