Related Experiment Video
Updated: Jun 17, 2026
06:41
Isolation Method for Long-Term and Short-Term Hematopoietic Stem Cells
Published on: May 19, 2023
Mechanisms of hematopoietic stem cell aging
Aysegul V Ergen1, Margaret A Goodell
1Baylor College of Medicine, TX 77030, USA.
Experimental Gerontology
|December 26, 2009
Summary
Aging hematopoietic stem cells (HSCs) show reduced regeneration and altered blood production due to genomic instability and oxidative stress. Understanding HSC aging and niche interactions is key to addressing age-related immune dysfunction.
Area of Science:
- Hematology
- Stem Cell Biology
- Gerontology
Background:
- Hematopoietic stem cells (HSCs) in bone marrow continuously produce blood cells, sustaining life.
- With aging, HSC regenerative potential declines, leading to skewed blood cell production (myelopoiesis over lymphopoiesis).
- The aged HSC pool expands, resulting in sufficient but abnormal blood output.
Purpose of the Study:
- To investigate the molecular mechanisms underlying HSC aging.
- To understand the impact of genomic instability and reactive oxygen species (ROS) on HSC function.
- To explore the role of HSC-niche interactions in age-related blood production abnormalities.
Main Methods:
- Gene expression analysis in aged HSCs.
- Studies on the effects of ROS on HSC aging.
- Examination of aging-related changes in the HSC niche.
Main Results:
- Aging is linked to genomic instability in HSCs.
- ROS contribute to HSC aging and failure.
- Changes in HSC-niche interactions may explain lineage skewing in aged individuals.
Conclusions:
- HSC aging involves genomic instability and ROS-induced damage.
- Altered HSC-niche interactions are implicated in age-related blood disorders.
- Further research into these mechanisms could reveal therapeutic targets for immune dysfunction in aging.
Related Concept Videos
01:01Regulation 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...
01:19Multipotency 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...
01:26Aging
Aging is a complex biological phenomenon influenced by various processes that affect cellular and systemic functions. Several prominent theories attempt to explain its mechanisms, highlighting cellular limitations, oxidative damage, and hormonal changes as central factors in aging.
Cellular Clock Theory
The cellular clock theory posits that the human lifespan is closely tied to the finite capacity of cells to divide, a phenomenon governed by telomeres, which are protective caps at the ends of...
Cellular Clock Theory
The cellular clock theory posits that the human lifespan is closely tied to the finite capacity of cells to divide, a phenomenon governed by telomeres, which are protective caps at the ends of...
01:21Hematopoiesis
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...
01:19The Effect of Aging on Tissues
Several body functions deteriorate with age. The external signs of aging are easily identifiable. For example, the skin becomes dry, less elastic, and thins out, forming wrinkles. The skin of the face begins to appear looser due to a decrease in the levels of elastic and collagen fibers in the connective tissue. Additionally, melanin production in the hair follicle decreases with age, resulting in gray hair. Moreover, the senses of sight and hearing decline, so glasses and hearing aids may...
02:15Replicative Cell Senescence
Replicative cell senescence is a property of cells that allows them to divide a finite number of times throughout the organism's lifespan while preventing excessive proliferation. Replicative senescence is associated with the gradual loss of the telomere — short, repetitive DNA sequences found at the end of the chromosomes. Telomeres are bound by a group of proteins to form a protective cap on the ends of chromosomes. Embryonic stem cells express telomerase — an enzyme that adds the telomeric...