Multikingdom gut microbiome and immune aging: a host–microbial signaling perspective
This abstract-based perspective argues that age-related gut microbiome changes are not one uniform 'aged microbiome' and not a single upstream cause of immune aging. Evidence is strongest for selected bacterial mechanisms in experimental models; the relationship is described as reciprocal and potentially modifiable. [1]
Automatic summary · not editorially reviewed
The key findings
The authors state that microbiome changes do not define a single 'aged microbiome' and vary with health, frailty, diet, medication exposure and environment. [1]
Age-associated changes in microbial metabolites and immunostimulatory products can influence the epithelial barrier, inflammatory signaling, immunometabolism, blood-cell formation and immune-cell states. [1]
Causal support is most developed for selected bacterial mechanisms in experimental models, while aging-specific evidence for fungi, viruses and archaea remains comparatively limited. [1]
The source at a glance
- Study type / format
- Perspective article (abstract only)
- Population / context
- Not specified in the abstract; the perspective concerns immune aging and the gut microbiome in general, without a defined study population.
- Summary based on
- Study abstract
- Original publication
- October 14, 2026
Why one 'aged microbiome' is questioned
Immune aging involves varied changes in blood-cell production, immune-cell function, inflammatory regulation and tissue-specific immune states. In parallel, the gut microbiome changes across bacteria, fungi, viruses and archaea. The authors stress that these changes do not define a single 'aged microbiome' and vary with health, frailty, diet, medication exposure and environment. They ask how these microbial changes intersect with different trajectories of immune aging.
Supporting source [1]
Four processes linking microbes and immune aging
Instead of treating dysbiosis as a uniform upstream cause of immunosenescence, the authors organize evidence around four interconnected processes: microbial signal generation, tissue access and compartmentalization, host sensing, and cell-specific interpretation. Age-associated changes in microbial metabolites and immunostimulatory products can influence the epithelial barrier, inflammatory signaling, immunometabolism, blood-cell formation, and lymphoid and myeloid cell states.
Supporting source [1]
Reciprocal link, uneven evidence across kingdoms
Evidence strength varies substantially across pathways and microbial kingdoms. Causal support is most developed for selected bacterial mechanisms in experimental models, while aging-specific mechanistic evidence for fungi, viruses and archaea remains comparatively limited. The relationship is described as reciprocal: intrinsic immune and tissue aging can also reshape microbial ecology and function. The authors therefore view the gut microbiome as a dynamic, potentially modifiable component of immune aging rather than an autonomous driver, and suggest targeting microbiome-associated functions and host-response pathways linked to specific immune-aging phenotypes.
Supporting source [1]
How to interpret this
Abstract only; the full text was not reviewed. This is a perspective, not a new study, and reports no sample, follow-up or outcome data. Evidence strength is described as varying across pathways and microbial kingdoms, with causal support mainly for selected bacterial mechanisms in experimental models.
Based on the study abstract; the full paper, tables and supplementary data were not reviewed.
Source & supporting passages
Jiang B, Liu T, Duan W, Xue Y. · europepmc.org · October 14, 2026