Related Experiment Video
Updated: Feb 9, 2026
22:06
Derivation of Hematopoietic Stem Cells from Murine Embryonic Stem Cells
Published on: February 25, 2007
14.0K
Aged murine hematopoietic stem cells drive aging-associated immune remodeling
Hanna Leins1,2, Medhanie Mulaw3, Karina Eiwen2
1Department of Internal Medicine I, University Hospital of Ulm, Ulm, Germany.
Blood
|June 13, 2018
Summary
Aging hematopoietic stem cells (HSCs) drive immune system decline. Rejuvenating aged HSCs with CASIN restores immune function and response to vaccination, highlighting HSCs
Area of Science:
- Immunology
- Hematology
- Gerontology
Background:
- Immune system aging leads to functional decline, increasing elderly morbidity and mortality.
- Aging hematopoietic stem cells (HSCs) are implicated in immune system remodeling.
- Elevated Cdc42 activity in aged HSCs contributes to their aging process.
Purpose of the Study:
- To investigate the role of HSC aging in immune system remodeling.
- To assess the potential of rejuvenating aged HSCs to restore immune function.
Main Methods:
- Established a HSC transplantation model in RAG1-/- mice (T- and B-cell deficient).
- Transplanted young and aged HSCs, and aged HSCs treated with CASIN (Cdc42 inhibitor).
- Analyzed reconstituted immune system phenotypes and functions, including response to vaccination.
Main Results:
- Immune system aging is primarily driven by HSC functional changes, largely independent of the thymus.
- Aged HSCs reconstituted aged-like immune systems, while young HSCs reconstituted young-like systems.
- CASIN treatment rejuvenated aged HSCs, restoring a young-like immune system and vaccination response.
Conclusions:
- HSC aging is a key driver of age-associated immune dysfunction.
- Targeting Cdc42 activity in HSCs can reverse immune aging.
- Epigenetic imprints in aged HSCs dictate the function of their progeny.
Related Concept Videos
01:26Aging
719
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...
719
01:19The Effect of Aging on Tissues
3.6K
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...
3.6K
01:09Changes in the Appendicular Skeleton with Age
3.6K
The upper and lower limb initially develops as a small bulge called a limb bud, which appears on the lateral side of the early embryo. The upper limb bud appears near the end of the fourth week of development, with the lower limb bud appearing shortly after.
Initially, the limb buds consist of a core of mesenchyme covered by a layer of ectoderm. The ectoderm at the end of the limb bud thickens to form a narrow crest called the apical ectodermal ridge. This ridge stimulates the underlying...
Initially, the limb buds consist of a core of mesenchyme covered by a layer of ectoderm. The ectoderm at the end of the limb bud thickens to form a narrow crest called the apical ectodermal ridge. This ridge stimulates the underlying...
3.6K
01:19Multipotency of Hematopoietic Stem Cells
3.9K
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...
3.9K
01:01Regulation of Hematopoietic Stem Cells
4.1K
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...
4.1K
01:27Pharmacodynamics in Geriatric Patients: Effects of Age
240
Age-related pharmacokinetic changes are extensively documented, but understanding age-related pharmacodynamic alterations is relatively limited. This knowledge gap can be partly attributed to the complexity of developing appropriate measures of drug responses compared to bioanalytical methods for determining drug concentrations.Most information regarding age-related differences in human pharmacodynamics originates from cross-sectional studies. However, these studies assume that observed mean...
240