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bioRxiv

Some blood stem cells kept immune-cell potential in aging mice

Mouse experiments identified self-renewing blood stem cells that retained a similar tendency to replenish certain immune cells during aging.

Paper by Yao Ma, Xinying Li, Xialin Li, +8 more authorsFang Dong · Chinese Academy of Medical Sciences & Peking Union Medical College
A large blood stem cell sits among smaller stem cells, lymphocytes, a separate gray cell cluster, and laboratory mice of different sizes.

Our read

Mechanisms
Studied:
Preprint: experiments in mice
What changed:
The stem-cell subset retained a similar preference for rebuilding lymphocyte populations as mice aged
The catch:
Lymphocyte rebuilding was measured rather than overall immune function
Why it’s aging research:
It studies organisms or tissues that aged naturally.

Editor of record: Boris Djordjevic · AgingResearch.News

Paper
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In experiments in mice, researchers identified a subset of blood stem cells that could renew themselves and favored producing lymphocytes, a type of immune cell. In young mice, these cells showed a comparable ability to produce multiple blood cell types to the blood stem cells used for comparison. The subset also retained a similar preference for rebuilding lymphocyte populations during aging. Analyses of gene activity and proteins supported its immune-related characteristics.

The subset and the comparison stem cells rarely gave rise to one another after their first division in the lab or under normal conditions in mice. The authors suggested that the populations were most likely independent and that the subset may provide a backup source for lymphocyte production.

Why it matters

Lymphocyte production declines with age. The authors proposed this subset as a promising target for studying age-related immune decline and developing therapeutic strategies.

Caveats

The experiments involved mice and mouse cells, not treatments for immune decline in people. The report is a preprint and has not been peer-reviewed.

Where the evidence stands

Immune response

Cells, worms or flies, mice and humans: replicated by independent labs.

C, W, M, H: cells, worms or flies, mice, humans. Dark: independent labs found the same change there. Light: one lab or one study. Outline: nothing yet.

Labs are independent when their papers share no last author and no institution.

Against: findings that point the other way from most findings on the same outcome.

Company ties: findings with an author at a company, or from a paper whose competing-interests statement declares ties to one.

Includes the processes named after it and trials of drugs aimed at it.

  • 300 independent labs in 46 countries
  • 30 findings against
  • Funders: National Institutes of Health and others
  • 82 of 543 findings with company ties

Stem cell differentiation

Cells and mice: replicated by independent labs. Worms or flies and humans: a single group.

C, W, M, H: cells, worms or flies, mice, humans. Dark: independent labs found the same change there. Light: one lab or one study. Outline: nothing yet.

Labs are independent when their papers share no last author and no institution.

Against: findings that point the other way from most findings on the same outcome.

Company ties: findings with an author at a company, or from a paper whose competing-interests statement declares ties to one.

Includes the processes named after it and trials of drugs aimed at it.

  • 264 independent labs in 37 countries
  • 18 findings against
  • Funders: National Natural Science Foundation of China and others
  • 34 of 485 findings with company ties

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