Spatial proteomics mapping of aged mouse gut tissue reveals localized accumulation of senescent immune cells near the epithelial barrier, metabolic reprogramming through mTOR upregulation, and compartment-specific immune exhaustion in lymphoid regions. These interconnected molecular alterations indicate progressive dysregulation of intestinal immune homeostasis, with direct implications for age-related loss of mucosal barrier resilience.
Key Points
- Senescent T cells accumulate adjacent to gut epithelium with age
- mTOR signaling and glycolytic reprogramming mark aged mucosal tissue
- T-cell exhaustion patterns differ between Peyer's patches and surrounding mucosa
Longevity Analysis
The gut mucosa functions as both a selective barrier and a specialized immune compartment. Age-related senescence in this tissue reflects a broader pattern of cellular dysfunction that compromises both defense capacity and the ability to discriminate between beneficial and pathogenic signals. The metabolic reprogramming observed here—elevated mTOR signaling and glycolytic activity—suggests that aged mucosal cells are locked into an energy-expensive, inefficient state rather than operating optimally. This has cascading effects on neighboring epithelial cells and the microbial ecosystem. Understanding these spatial, compartment-specific changes moves beyond treating the gut as a single functional unit and recognizes that resilience in aging depends on maintaining appropriate molecular dialogue across distinct microenvironments. Interventions targeting mTOR regulation and senescent cell clearance represent leverage points for restoring mucosal homeostasis.
Original published by Wiley Aging Cell, by Jack Sullivan, Jessica Conway, Sophie J. Hopkin, Myriam Chimen, Niharika A. Duggal .