A study published in Aging Cell by a team of Japanese researchers delves into the aging of hematopoietic stem cells and its broader implications for the body. The research reveals that hematopoietic aging drives multiple downstream consequences, particularly through processes such as clonal hematopoiesis and chronic inflammation.

Understanding Hematopoietic Aging

Clonal hematopoiesis, characterized by the proliferation of defective blood cells, represents a primary driver of hematopoietic aging. Increased inflammation further exacerbates the proliferation of these dysfunctional, parasitic cells. This phenomenon can lead to severe health consequences as its implications extend to various organ systems and can be linked to age-related diseases such as atherosclerosis.

A Systemic Issue

Researchers emphasize that aging and related diseases manifest as various hallmarks, which can be interconnected across bodily systems. They suggest that hematopoietic aging is influenced by:

  • Metabolic dysregulation
  • Epigenetic changes
  • Genomic instability
  • Inflammaging: a term referring to the chronic low-grade inflammation often observed in aging populations.

Though these factors are partly intrinsic, environmental influences also significantly contribute to the observed inflammaging phenomena (Franck et al., 2025).

Fundamental Causes of Hematopoietic Aging

One significant aspect of hematopoietic aging is oxidative stress, which can damage DNA and limit the self-renewal ability of hematopoietic stem cells. Research indicates that antioxidative treatments might mitigate these effects (Yahata et al., 2011). Other critical underlying mechanisms include:

  1. Mitochondrial dysfunction: A hallmark of aging that increases oxidative stress (Bratic & Larsson, 2013).
  2. Reduced autophagy: The breakdown of defective mitochondria and other organelles decreases, contributing to cellular aging (Warr et al., 2013).

DNA damage, particularly related to specific epigenetic regulator genes such as DNMT3A, TET2, and ASXL1, significantly contributes to the competitive advantage of mutated cells over healthy ones. Notably, older men may experience complete loss of the Y chromosome in their mutant cells, further linking clonal hematopoiesis to age-related diseases (Bruhn-Olszewska et al., 2025).

Bone Marrow Aging Factors

The aging bone marrow displays distinct alterations:

Characteristic Impact
Reduction in blood vessels Decreased nutrient supply to hematopoietic stem cells
Increased bone marrow fat Impaired hematopoiesis and regeneration
Depletion of osteoblasts Reduced bone support for stem cells

The effects of physical stress, such as the stiffening of the extracellular matrix, contribute to the degradation of the stem cell niche. Furthermore, inflammation and its sources—such as dietary microbiota—pose a significant threat, particularly as inflammation can lead to enduring changes within the hematopoietic system (Stucker et al., 2020).

Potential Therapies

To combat hematopoietic aging, various therapeutic strategies have been proposed:

  • Cellular senescence targeting: Senolytics and senomorphics hold promise, though their specific impact within hematopoiesis remains uncertain.
  • Youthful plasma transfusion: Has shown efficacy in some contexts, especially related to the activity of bone marrow stromal cells (Baht et al., 2015).
  • Targeting clonal cells: Direct therapies aiming at mitigating the effects of clonal hematopoiesis may prove beneficial.

Ongoing research is necessary to discern effective strategies that may halt or reverse clonal hematopoiesis and its negative consequences.

Support Independent Journalism

We are a non-profit foundation committed to providing free access to our news and educational content. Your contributions, large or small, help us sustain independent journalism focused on aging research.

References

[1] Franck, M., et al. (2025). Nonuniversality of inflammaging across human populations. Nature Aging.

[2] Jaiswal, S., et al. (2017). Clonal hematopoiesis and risk of atherosclerotic cardiovascular disease. New England Journal of Medicine, 377(2), 111-121.

[3] Yahata, T., et al. (2011). Accumulation of oxidative DNA damage restricts the self-renewal capacity of human hematopoietic stem cells. Blood, 118(11), 2941-2950.

[4] Bratic, A. & Larsson, N. G. (2013). The role of mitochondria in aging. The Journal of Clinical Investigation, 123(3), 951-957.

[5] Warr, M. R., et al. (2013). FOXO3A directs a protective autophagy program in hematopoietic stem cells. Nature, 494(7437), 323-327.

[6] Bruhn-Olszewska, B., et al. (2025). The effects of loss of Y chromosome on male health. Nature Reviews Genetics, 26(5), 320-335.

[7] Hosseini, M., et al. (2025). Metformin reduces the competitive advantage of Dnmt3a R878H HSPCs. Nature.

[8] Totani, H., et al. (2025). Mitochondria-enriched hematopoietic stem cells exhibit elevated self-renewal capabilities. Nature Aging.

[9] Stucker, S., et al. (2020). Bone angiogenesis and vascular niche remodeling in stress, aging, and diseases. Frontiers in Cell and Developmental Biology.

[10] Ambrosi, T. H., et al. (2017). Adipocyte accumulation in the bone marrow during obesity and aging impairs stem cell-based hematopoietic and bone regeneration. Cell Stem Cell.

[11] Morrison, S. J. & Scadden, D. T. (2014). The bone marrow niche for hematopoietic stem cells. Nature, 505(7483), 327-334.

[12] Koh, B. I., et al. (2024). Adult skull bone marrow is an expanding and resilient hematopoietic reservoir. Nature.

[13] Zhang, X., et al. (2023). Harnessing matrix stiffness to engineer a bone marrow niche for hematopoietic stem cell rejuvenation. Cell Stem Cell.

[14] Tuljapurkar, S. R., et al. (2011). Changes in human bone marrow fat content associated with changes in hematopoietic stem cell numbers and cytokine levels with aging. Journal of Anatomy.

[15] Bogeska, R., et al. (2022). Inflammatory exposure drives long-lived impairment of hematopoietic stem cell self-renewal activity and accelerated aging. Cell Stem Cell.

[16] Agarwal, P., et al. (2025). Microbial metabolite drives aging-related clonal hematopoiesis via ALPK1. Nature.

[17] Zeng, X., et al. (2023). Fecal microbiota transplantation from young mice rejuvenates aged hematopoietic stem cells by suppressing inflammation. Blood.

[18] Baht, G. S., et al. (2015). Exposure to a youthful circulation rejuvenates bone repair through modulation of β-catenin. Nature Communications.

About the Author

Josh Conway has been writing and editing articles for the Lifespan Research Institute over the past decade, playing a critical role in the development of daily news content related to aging research. With a background in programming, Josh has a long-standing commitment to advocating for advancements in anti-aging medicine.