Inflammation and mortality in a frail mouse model.

Area of Science:

• Gerontology
• Immunology
• Endocrinology

Background:

• Interleukin 10 (IL-10) gene deletion in mice partially models human frailty.
• These mice exhibit midlife skeletal muscle weakness and altered gene expression.
• Further characterization is needed to validate their use as a frailty model.

Purpose of the Study:

• To evaluate inflammatory pathway activation, endocrine changes, and mortality in IL-10 deficient mice.
• To further characterize IL-10 knockout mice as a model for human frailty.
• To assess the longitudinal changes in cytokines and insulin-like growth factor 1 (IGF-1).

Main Methods:

• Serum cytokine analysis (IL-6, IL-1β, TNF-α, IFN-γ, KC, IL-12, IL-10) via electro-chemiluminescent multiplex immunoassay.
• Insulin-like growth factor 1 (IGF-1) measurement using ELISA.
• Longitudinal survival monitoring and necropsy in IL-10 knockout and control mice.

Main Results:

• IL-10 knockout mice showed significantly elevated serum IL-6, IL-1β, TNF-α, IFN-γ, and KC levels across all ages compared to controls.
• Mean serum IGF-1 levels were higher in 48-week-old IL-10 knockout mice, with a different age-related IGF-1 trajectory.
• IL-10 knockout mice exhibited a significantly higher overall mortality rate.

Conclusions:

• The IL-10 deficient mouse model displays heightened low-grade inflammation and altered IGF-1 dynamics.
• These findings support the utility of IL-10 knockout mice for studying frailty.
• The model is valuable for investigating the interplay between inflammation and endocrine factors in aging.