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Stem Cell Niche

Stem Cell Niche

The stem cell niche is the dynamic microenvironment where stem cells reside. Inside these niches, the cells may remain undifferentiated, undergo high self-renewal, or become lineage-specific progenitors. Stem cells coexist with other niche cells, such as stromal cells. They also interact closely with the ECM. Cell-cell and cell-matrix communication occur via adhesion molecules or soluble factors that signal the stem cells and determine their fate. Stromal cells also provide survival signals to...

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

Lineage Commitment

Commitment is the process whereby stem cells:

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...

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...

Role of Hematopoietic Growth Factors

Role of Hematopoietic Growth Factors

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.
Thrombopoietin (TPO), mainly released by the liver,...

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Related Experiment Video

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The molecular and cellular hematopoietic stem cell specification niche.

Wilson K Clements¹, Hanane Khoury¹

¹Department of Hematology, St. Jude Children's Research Hospital, Memphis, TN.

Experimental Hematology

|July 15, 2024

Summary

Understanding hematopoietic stem cell (HSC) specification requires further research into the embryonic development and the crucial role of the "specification niche." This niche, comprising specific microenvironments and signaling pathways, is key to HSC emergence and maturation.

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Bioengineering of Humanized Bone Marrow Microenvironments in Mouse and Their Visualization by Live Imaging

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Area of Science:

Developmental biology
Hematopoiesis
Stem cell biology

Background:

Hematopoietic stem cells (HSCs) are vital for lifelong blood regeneration.
Understanding HSC specification during embryonic development is crucial for clinical applications.
Current methods for directed HSC differentiation are limited by incomplete knowledge of developmental processes.

Purpose of the Study:

To review recent advancements in understanding HSC specification niches across vertebrates.
To explore how niche cell origins and phenotypes inform HSC emergence and maturation.
To highlight the complexities in current knowledge of HSC specification.

Main Methods:

Review of recent scientific literature on HSC specification and niche biology.
Comparative analysis of niche spaces across different vertebrate species.
Integration of findings on niche cell origins and molecular phenotypes.

Main Results:

Recent progress has been made in characterizing HSC specification niches in various vertebrate models.
The origin and molecular characteristics of niche cells provide new insights but also complicate existing models.
Knowledge of the complete set of precursor identities and inductive signals for HSCs remains incomplete.

Conclusions:

Further research into the embryonic origin and microenvironment of HSCs is essential.
A deeper understanding of the "specification niche" is critical for advancing HSC biology and regenerative medicine.
Characterizing niche cell populations is key to deciphering the complex signaling required for HSC development.