Upregulation of colonic luminal polyamines produced by intestinal microbiota delays senescence in mice.
Level 5 - mechanism / opinion, no new human data
Animal experiment with no human data (Oxford CEBM Level 5).
PubMed 24686447 · doi:10.1038/srep04548
What was done
Mice were orally administered arginine alone or in long-term combination with the probiotic bacterium *Bifidobacterium* strain LKM512 to evaluate effects on colonic and circulating polyamine concentrations (putrescine, spermidine, spermine), inflammation, longevity, and age-induced memory impairment.
What was found
Arginine intake increased putrescine concentrations in the colon and elevated spermidine and spermine levels in the blood. Combined long-term administration of arginine and LKM512 suppressed inflammation, improved longevity, and protected mice against age-induced memory impairment. The abstract reports no numerical values, effect sizes, or statistical metrics.
Why it matters
This study demonstrates that microbial upregulation of luminal polyamines via combined probiotic and substrate supplementation can mitigate systemic aging phenotypes and cognitive decline in a mammalian model.
Limits
The study is restricted to mice and provides no human clinical data. The abstract omits sample sizes, control group specifications, exact dosages, treatment duration, and quantitative data for all outcome measures.
Cited by
- supports A Japanese research group published findings showing that specific gut bacteria overproducing polyamines reduce colon cancer development and aging.