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bioRxiv

Gut cell loss and repair wait for oxygen to return in flies

Low oxygen prepared gut cells to die and activated signals in stem cells in adult flies, but cell death and stem-cell division waited until oxygen returned.

Paper by P. Bodkhe, K. Ding, S. S. Grewal · University of Calgary
Fruit fly gut lining with intact gray cells beside shedding cells and dividing stem cells, surrounded by oxygen molecules and a magnified fly.

Our read

Mechanisms
Studied:
Preprint: experiments in adult fruit flies, against flies under low oxygen
What changed:
Gut cell loss and stem-cell multiplication began after oxygen returned, but did not occur during low oxygen
The catch:
Stem-cell proliferation and intestinal length are stand-ins for restored gut function

Editor of record: Boris Djordjevic · AgingResearch.News

Paper
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Adult fruit flies (Drosophila) underwent low oxygen followed by restored oxygen in experiments examining how the intestinal lining responds. Low oxygen activated two parallel responses, mostly in separate groups of enterocytes, the cells lining the gut. One prepared these cells for programmed cell death. The other activated signals in intestinal stem cells, which produce new gut cells.

Neither cell death nor stem-cell multiplication occurred until oxygen returned. Then, gut cell loss and stem-cell multiplication proceeded together. Both were needed for the intestine to regain its length. Repeated episodes of low oxygen followed by oxygen restoration also shortened the flies’ lifespan.

Why it matters

Maintaining the intestinal lining requires coordination between cell removal and replacement. The work addresses how tissues manage that balance when oxygen availability changes.

Caveats

The gut repair results came from experiments in adult fruit flies; whether human intestines respond the same way remains open. This preprint has not been peer-reviewed.

Where the evidence stands

Hypoxia

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

  • 89 independent labs in 26 countries
  • 18 findings against
  • Funders: National Institutes of Health and others
  • 15 of 201 findings with company ties

TP53

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

  • 215 independent labs in 34 countries
  • 21 findings against
  • Funders: National Institutes of Health and others
  • 31 of 450 findings with company ties

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The paper

Parallel enterocyte caspase and cytokine responses couple hypoxia to reoxygenation-dependent intestinal regeneration in Drosophila

P. Bodkhe, K. Ding, S. S. Grewal

University of Calgary

bioRxiv, Nov 13, 2026, Open access, Preprint, not yet peer-reviewed

doi.org/10.64898/2026.11.12.766219

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