Life-long microbiome rejuvenation improves intestinal barrier function and inflammaging in mice.
Level 5 - mechanism / opinion, no new human data
Preclinical animal model
PubMed 40176137 · doi:10.1186/s40168-025-02089-8
What was done
Mice received recurrent fecal microbial transfers (FMT) throughout life with microbial material derived either from 8-week-old young mice (yMB) or age-matched controls (isochronic microbiome, iMB). Researchers evaluated motor coordination and strength via rotarod and grip strength tests, intestinal barrier integrity using serum LAL assays, mucosal transcriptional alterations via single-cell RNA sequencing, and fecal microbial composition using 16S rRNA gene profiling and metagenomics.
What was found
No numerical values or effect sizes were reported in the abstract. Colonization with yMB improved motor coordination on the rotarod and reduced intestinal permeability relative to iMB controls. Metagenomically, yMB demonstrated fewer pro-inflammatory factors, altered metabolic pathways favoring oxidative phosphorylation, and more antagonistic bacterial interactions. Single-cell RNA sequencing revealed increased ATP synthesis and mitochondrial pathway activity, decreased age-dependent mesenchymal transcripts in enterocytes and transit-amplifying cells, and reduced inflammatory signaling in macrophages and other immune cells.
Why it matters
This study provides mammalian evidence that lifelong recurrent transfer of young microbiota can attenuate multiple hallmarks of aging, including gut barrier decline and mucosal inflammaging.
Limits
The abstract reports no sample sizes, numerical values, or statistical confidence intervals. The experiment was conducted entirely in mice, so translatability to humans is unknown, and effects on total lifespan were not reported.
Cited by
- supports Transplanting gut microbiota from young mice into aged mice produces rejuvenative effects.