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bioRxiv

Exercise countered age-linked gene control changes in mice

Aging increased the involvement of gene-regulating proteins at more than 100,000 DNA sites in mouse hearts; endurance exercise opposed most increases.

Paper by Jack Clarke, Fujian Wu, Vaibhao Janbandhu, +16 more authorsEmily S. W. Wong · Victor Chang Cardiac Research Institute
Heart muscle nuclei contain dense protein clusters beside a resting mouse and sparse clusters beside a mouse running in a wheel.

Our read

Interventions
Studied:
Preprint: experiments in mice
What changed:
Exercise countered most age-related increases in gene-regulating protein engagement at DNA sites in mouse hearts
The catch:
The molecular findings describe gene regulation, not benefits for heart function or lifespan
In the record:
One of 138 papers on endurance exercise on record: 48 with results in people, 32 in animals.
Why it’s aging research:
An intervention with evidence on lifespan or healthspan.

Editor of record: Boris Djordjevic · AgingResearch.News

Paper
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Mouse hearts were examined in an animal experiment using measurements from individual cells and endurance exercise to investigate age-related changes in gene control. The researchers studied enhancers, stretches of DNA that help control gene activity.

Aging increased engagement of AP-1, a protein complex that regulates gene activity, at more than 100,000 DNA sites across heart cell types. Exercise opposed most of these increases. Tests of enhancer sequences revealed substantial hidden potential to drive gene activity. The authors proposed that aging activates existing, cell-type-specific enhancers and that ongoing signaling keeps them active. This acquired activity remained responsive to changes in signaling even in old age.

Why it matters

Changes in gene control are part of aging. The work supports investigating how ongoing signals sustain those changes late in life.

Caveats

These molecular findings in mouse hearts do not establish benefits for heart function or lifespan in people. The work is a preprint and has not been peer-reviewed.

Where the evidence stands

Endurance exercise

Mice and humans: replicated by independent labs. Worms or flies: a single group. Cells: nothing yet.

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.

  • 38 independent labs in 18 countries
  • 5 findings against
  • Funders: National Natural Science Foundation of China and others
  • 6 of 142 findings with company ties

AP-1

Cells: a single group. Worms or flies, mice and humans: nothing yet.

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.

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.

  • 1 lab in 1 country
  • Funders: Agence Nationale de la Recherche and 4 more
  • 1 of 1 finding with company ties

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