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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...

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...

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

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,...

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...

Overview of Hematopoiesis

Overview of Hematopoiesis

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...

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Related Experiment Video

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Isolation Method for Long-Term and Short-Term Hematopoietic Stem Cells

Isolation Method for Long-Term and Short-Term Hematopoietic Stem Cells

Published on: May 19, 2023

Microenvironmental contributions to hematopoietic stem cell aging.

Ya-Hsuan Ho^1,2, Simón Méndez-Ferrer^3,2

¹Wellcome Trust-Medical Research Council Cambridge Stem Cell Institute and Department of Haematology, University of Cambridge, Cambridge yhh29@medschl.cam.ac.uk.

|December 7, 2019

Summary

Hematopoietic stem cell (HSC) aging is influenced by the bone marrow microenvironment. Aging HSCs and their niche interact, leading to myeloid-biased blood cell production and immune deficiency.

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

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

Published on: August 1, 2017

Area of Science:

Hematology
Stem Cell Biology
Aging Research

Background:

Hematopoietic stem cell (HSC) aging was initially considered intrinsic to HSCs.
Recent research highlights the significant role of the HSC niche in HSC aging.
The HSC niche is a complex network of cells and signaling molecules.

Purpose of the Study:

To review the contribution of the HSC niche to HSC aging.
To explore the cellular and molecular changes within the aging HSC niche.
To understand the consequences of HSC niche aging on hematopoietic stem cells and progeny.

Main Methods:

Review of existing literature on HSC niche aging.
Analysis of cellular interactions within the bone marrow microenvironment.
Examination of molecular signaling pathways involved in aging.

Main Results:

Microenvironmental aging, including senescence and inflammation, impairs HSC function.
Changes in mesenchymal stromal cells, vasculature, and signaling impact HSC fate.
Aged HSCs and their progeny remodel the niche, promoting myeloid expansion.
This leads to lymphoid deficiency and myeloid skewing.

Conclusions:

The crosstalk between HSCs and their microenvironment is crucial for hematopoietic system aging.
Targeting the HSC niche offers potential therapeutic strategies for age-related blood disorders.