Related Experiment Video
Updated: Oct 14, 2025
07:40
Experimental Autoimmune Uveitis: An Intraocular Inflammatory Mouse Model
Published on: January 12, 2022
5.3K
Aging weakens Th17 cell pathogenicity and ameliorates experimental autoimmune uveitis in mice
1State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat-Sen University, Guangzhou, 510060, China.
Protein & Cell
|November 8, 2021
Summary
Aging dampens immune responses, particularly T helper 17 (Th17) cell activity, leading to milder experimental autoimmune uveitis (EAU) in older mice. This immune modulation impacts lymph node function and autoimmune disease progression.
Area of Science:
- Immunology
- Aging Research
- Autoimmune Diseases
Background:
- Aging significantly impacts immune system function, increasing susceptibility to infections and reducing vaccine efficacy.
- Lymph nodes are critical for immune surveillance, but the effects of aging on their cellular composition and function, especially in autoimmune contexts, require further investigation.
Purpose of the Study:
- To comprehensively characterize the aging-associated changes in immune cell populations within cervical draining lymph nodes (CDLNs).
- To investigate the influence of aging on the development and severity of experimental autoimmune uveitis (EAU).
- To elucidate the mechanisms underlying age-related alterations in T helper 17 (Th17) cell responses during autoimmune challenges.
Main Methods:
- Single-cell RNA sequencing (scRNA-seq) and flow cytometry were employed to analyze CDLNs from young and old mice.
- Mice were subjected to experimental autoimmune uveitis (EAU) induction to assess disease progression in different age groups.
- Quantitative analysis of immune cell populations, cytokine secretion (GM-CSF, IL-23), and receptor expression (IL-23R) was performed.
Main Results:
- Aging induces extensive and complex alterations in the cellular makeup of CDLNs.
- Old mice exhibited milder EAU severity compared to young mice when challenged with autoimmune conditions.
- Pathogenicity of Th17 cells was reduced in old mice, evidenced by decreased GM-CSF secretion, which was linked to reduced IL-23 secretion by antigen-presenting cells (APCs) and lower IL-23R expression in Th17 cells.
Conclusions:
- Aging significantly reshapes immune cell responses, notably by attenuating Th17 cell-mediated immunity.
- The observed dampening of Th17 cell responses in aged individuals contributes to a milder course of experimental autoimmune uveitis.
- These findings provide insights into the immunomodulatory effects of aging and their implications for autoimmune disease pathogenesis.
