Stem cell mix may help explain lower T cell output in aging mice
In lab-grown thymus models, individual mouse stem cells showed little, if any, age-related loss of T cell output within the same stem cell type.
Limit: T cell potential in organoids is a stand-in for production within an aging thymus
Stake: An author founded Pluto Immunotherapeutics.
Edited by Boris Djordjevic · AgingResearch.News
Researchers tested bone marrow stem cells from male and female C57BL/6J mice aged 7–8 weeks or 18–24 months in a lab experiment. They grew individual cells in artificial thymic organoids, lab models of the thymus, the organ where T cells develop.
Stem cells biased toward making lymphocytes, the immune-cell family that includes T cells, had greater T cell potential than those biased toward myeloid cells, another blood-cell family. The latter type predominated in aged bone marrow. Within each type, aging had little, if any, effect on T cell output. Early precursor cells from the thymus also had comparable T cell potential at both ages. The authors concluded that this shift likely contributed to declining T cell production with age, rather than a general loss of potential in individual stem and precursor cells.
Why it matters
T cell production declines throughout life. The study addressed whether that decline reflects changes within blood-forming cells or in the thymus environment that supports their development.
Caveats
The organoid experiments tested cell potential outside the body, not how cells functioned within an aging thymus. They did not establish how much the stem cell mix contributes to declining T cell production in living animals.
The paper
University of California, Los Angeles
Aging Cell, Jun 30, 2026, Open access
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