Aging remodels skin immune responses to infection and sensitization in mice
Epicutaneous challenges in mice reveal context-dependent shifts in local immune cell recruitment rather than a uniform decline in tissue immunity.
bioRxiv : the preprint server for biology · Severn MM et al. · Paper published 7 Sep 2026
In mouse models of aging, researchers characterized cutaneous immune responses to epicutaneous Staphylococcus aureus infection and ovalbumin-induced sensitization. Bulk RNA sequencing of infected skin tissue showed that transcriptional variation was primarily driven by infection rather than age, indicating that aged tissue retains a broadly inducible response to microbial challenge. However, microneedle patch profiling of skin interstitial fluid uncovered clear age-dependent differences in local cellular dynamics. Older mice displayed altered kinetics and magnitude of immune cell recruitment after S. aureus infection, including an attenuated cutaneous T cell response. Furthermore, ovalbumin sensitization prompted a distinct local immune program that systemic measurements failed to fully reflect. These results demonstrate that aging does not broadly suppress skin immunity, but instead remodels local tissue dynamics depending on the stimulus.
Why it matters
The findings show that aging reshapes local tissue defenses selectively rather than causing a blanket immune deficit. This context-dependent remodeling provides new insight into why susceptibility to cutaneous bacterial and viral infections rises with age.
Caveats
The investigation was conducted exclusively in mouse models, and its findings may not directly translate to human skin. In addition, the study is a preprint and has not yet undergone formal peer review.
Written from the paper’s abstract, and every claim checked against it before publishing. Read the paper for the full methods and data.
The paper
Infection and sensitization reveal stimulus-specific immune remodeling in aged skin
Severn MM, Voigt AY, Dhinakaran AK et al.
bioRxiv : the preprint server for biology · 7 Sep 2026 · Preprint, not yet peer-reviewed
- Relevance
- Relevant
- News value
- Notable
- Evidence
- Animals
- Status
- Preprint
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