A geroprotective probiotic and its functional metabolite counteract inflammaging to extend healthspan
核心洞察
A geroprotective probiotic and its functional metabolite have been shown to counteract inflammaging (搜索), the chronic low-grade inflammation associated with aging, thereby extending healthspan.
The study builds on evidence that age-associated gut microbial dysbiosis promotes intestinal permeability, systemic inflammation, and macrophage dysfunction.
Bifidobacterium pseudocatenulatum (搜索) strains, including NCU-08, have previously been reported to ameliorate senescence via modulation of the AMPK (搜索)/Sirt1 (搜索) signaling pathway and gut microbiota in mice.
A geroprotective probiotic and its functional metabolite have been identified as capable of counteracting inflammaging (搜索)—the chronic, low-grade systemic inflammation that accompanies aging—to extend healthspan. The research, published in Nature Aging, positions gut microbiome modulation as a promising strategy for promoting healthy aging.
The work is grounded in a substantial body of evidence linking the gut microbiome to the biology of aging. Age-associated microbial dysbiosis has been shown to promote intestinal permeability, systemic inflammation, and macrophage dysfunction, as reported by Thevaranjan and colleagues in Cell Host Microbe. This dysbiosis-driven inflammatory state, sometimes termed "inflamm-aging," is further supported by findings that gut microbiota-derived lipopolysaccharide accelerates inflamm-aging in mice.
The role of Bifidobacterium pseudocatenulatum
Central to the study is Bifidobacterium pseudocatenulatum (搜索), a bacterial species with an established record of geroprotective activity. Prior work demonstrated that Bifidobacterium pseudocatenulatum NCU-08 ameliorated senescence through modulation of the AMPK (搜索)/Sirt1 (搜索) signaling pathway and gut microbiota in mice. In a related study, L-tryptophan produced by Bifidobacterium pseudocatenulatum NCU-08 was shown to delay aging in SAMP8 mice by activating the Sirt1/P53/P21/Rb signaling pathway.
The species has also been implicated in broader host–microbe interactions. Bifidobacterium pseudocatenulatum (搜索) CECT 7765 reduced obesity-associated inflammation by restoring the lymphocyte–macrophage balance and gut microbiota structure in high-fat diet-fed mice, and ameliorated neuroendocrine alterations associated with exaggerated stress response and anhedonia in obese mice.
Functional metabolite and mechanism
The geroprotective effect is attributed to a functional metabolite produced by the probiotic. The study draws on the concept that microbial metabolites serve as key mediators of host physiology, with short-chain fatty acids and other bacterial products regulating colonic regulatory T cell homeostasis and intestinal barrier function. The identification of a specific functional metabolite underscores the mechanistic link between the probiotic and its anti-inflammatory, healthspan-extending effects.
Significance for healthy aging
The findings contribute to an emerging consensus that the gut microbiome acts as a modulator of healthy aging. Fecal microbiota transplantation from young to aged mice has been shown to reverse hallmarks of the aging gut, eye, and brain, while microbiota from young mice counteracts selective age-associated behavioral deficits. These observations collectively support the view that microbiome-targeted interventions—including geroprotective probiotics—may offer a tractable route to extending healthspan and mitigating age-related inflammatory decline.
The study's emphasis on a defined probiotic strain and its functional metabolite provides a mechanistic foundation for future translational efforts aimed at counteracting inflammaging (搜索) and promoting healthy longevity.