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Isolation Method for Long-Term and Short-Term Hematopoietic Stem Cells
Published on: May 19, 2023
Hematopoietic stem cell aging: wrinkles in stem cell potential.
1Center for Cell and Gene Therapy, Baylor College of Medicine, One Baylor Plaza, N1030, Houston, TX 77030, USA.
Stem Cell Reviews
|October 6, 2007
Summary
Aging hematopoietic stem cells (HSCs) increase in number but decline in function, contributing to immune system decline and inflammation. This review details age-related HSC changes and their impact on health.
Area of Science:
- Hematology
- Immunology
- Gerontology
Background:
- Hematopoietic stem cells (HSCs) are crucial for lifelong blood and immune system replenishment.
- Contrary to previous beliefs, aging significantly alters HSC function and phenotype.
- Understanding these changes is vital for addressing age-related immune dysfunction.
Purpose of the Study:
- To review the age-related changes in the hematopoietic system, with a focus on HSCs.
- To compile recent findings on HSC aging, including gene expression profiling.
- To explore the role of HSCs in immunosenescence.
Main Methods:
- Analysis of HSC concentration and marker expression in aged murine bone marrow.
- Hematopoietic stem cell transplantation studies.
- Gene expression profiling of aged HSCs.
Main Results:
- Aged HSCs increase in number and homogeneity within bone marrow.
- Despite increased numbers, aged HSCs show reduced hematopoietic output per cell.
- Gene expression analysis reveals factors contributing to inflammation, stress, and genomic instability in aged HSCs.
Conclusions:
- Aging hematopoietic stem cells exhibit a paradoxical increase in number alongside functional decline.
- Altered HSC function contributes to an imbalance in blood cell production, favoring myeloid over lymphoid cells.
- These age-associated HSC changes are implicated in immunosenescence and increased inflammation.
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