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Updated: Jun 6, 2026
05:27
Stromal Cell Isolation From Hematopoietic Organs
Published on: January 26, 2024
Declining lymphoid progenitor fitness promotes aging-associated leukemogenesis
Curtis J Henry1, Andriy Marusyk, Vadym Zaberezhnyy
1Department of Biochemistry and Molecular Genetics and Pediatrics, School of Medicine, University of Colorado Denver, Aurora, CO 80045, USA.
Summary
Aging increases cancer risk by reducing stem cell fitness, promoting the selection of mutations that restore function and drive leukemia development. This study reveals a new link between aging and cancer initiation.
Area of Science:
- Gerontology and Cancer Biology
- Hematopoiesis and Leukemia Pathogenesis
Background:
- Aging is linked to increased cancer risk, with age being a primary prognostic factor for many cancers.
- Current theories suggest cancer develops due to accumulated mutations over time.
- Aging causes functional decline in cells and tissues, potentially impacting stem cell fitness.
Purpose of the Study:
- To investigate if age-related functional decline in stem cells promotes cancer initiation.
- To explore the role of altered signaling pathways in age-associated cancer development.
- To test the hypothesis that reduced stem cell fitness enhances selection for oncogenic mutations.
Main Methods:
- Utilized mouse hematopoietic models to study aging and cancer.
- Analyzed B-lymphopoiesis fitness and receptor-associated kinase signaling in aged versus young progenitors.
- Introduced Bcr-Abl oncogene to assess its competitive advantage in different age groups and manipulated IL-7 signaling.
Main Results:
- Aged B-lymphoid progenitors showed reduced fitness and altered kinase signaling.
- Bcr-Abl conferred a greater competitive advantage to aged progenitors, restoring kinase signaling and promoting leukemia.
- Impaired IL-7 signaling accelerated the selection of Bcr-Abl-expressing progenitors.
Conclusions:
- Aging-dependent alterations in stem cell fitness landscape drive the selection of oncogenic mutations.
- Reduced stem cell fitness, not just mutation accumulation, is a key factor in age-related cancer initiation.
- This study establishes a causative link between aging and cancer through enhanced selection of oncogenic mutations.
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