Stem Cell Exhaustion

Definition

Stem cell exhaustion is the age-related decline in the number, function, or regenerative capacity of tissue stem cells. It can involve reduced self-renewal, impaired differentiation, altered responses to tissue damage, changes in the stem-cell niche, accumulated DNA damage, epigenetic changes, senescence, or inflammatory signals that make tissues less able to maintain and repair themselves. [1] [2] [3]

Why It Matters in Ageing Research

Stem cell exhaustion matters because many tissues rely on resident stem cells to replace damaged or lost cells over time. As stem-cell function declines, tissues can become slower to repair, less resilient after injury, and more vulnerable to age-related dysfunction. It is considered one of the hallmarks of ageing and is relevant to systems such as blood, muscle, skin, intestine, and the nervous system. [1] [4] [5]

Common Confusion

• Stem cell exhaustion does not mean all stem cells disappear; it means their regenerative performance can decline.
• Stem-cell ageing depends on both the stem cells themselves and the surrounding tissue environment.
• Stem cell exhaustion is not the same thing as receiving a stem-cell treatment or transplant.

Related Reading

• Cellular Senescence
• Genomic Instability

References

1. López-Otín, C., et al. (2013). The hallmarks of aging. https://pubmed.ncbi.nlm.nih.gov/23746838/
2. Oh, J., Lee, Y. D., & Wagers, A. J. (2014). Stem cell aging: Mechanisms, regulators and therapeutic opportunities. https://pubmed.ncbi.nlm.nih.gov/24484927/
3. Goodell, M. A., & Rando, T. A. (2015). Stem cells and healthy aging. https://pubmed.ncbi.nlm.nih.gov/25710536/
4. López-Otín, C., et al. (2023). Hallmarks of aging: An expanding universe. https://pubmed.ncbi.nlm.nih.gov/36599349/
5. Brunet, A., & Rando, T. A. (2017). Interaction between epigenetic and metabolism in aging stem cells. https://pubmed.ncbi.nlm.nih.gov/28388419/