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Adaptive immune crosstalk and complement dysregulation in the aging retina
Ting-Yi Lin1,2, Ching-Yun Wang3, Lawrence Chen4
1Doctoral Degree Program of Translational Medicine, National Yang Ming Chiao Tung University and Academia Sinica, Taipei, Taiwan.
Tzu Chi Medical Journal
|May 14, 2026
Summary
Aging eyes shift from immune protection to chronic inflammation, driving retinal diseases like age-related macular degeneration (AMD). This involves T-cells, complement system activation, and altered retinal cell functions, leading to vision loss.
Area of Science:
- Ophthalmology
- Immunology
- Neuroscience
Background:
- The eye, once considered immune-privileged, is now understood as a complex immunological site.
- Aging and retinal diseases like age-related macular degeneration (AMD) involve a breakdown of immune balance, leading to chronic inflammation.
- Adaptive immunity plays a significant role in AMD pathogenesis.
Purpose of the Study:
- To elucidate the intricate interplay between innate and adaptive immunity in the aging eye.
- To understand the mechanisms driving chronic inflammation in age-related retinal degeneration.
- To identify key molecular players and cellular components involved in retinal immune dysregulation.
Main Methods:
- Analysis of adaptive immune cell changes, including CD8+ T-cell aging and autoantibody production.
- Investigation of complement system activation pathways (e.g., C5a, C1q, C3, CFH) and their role in retinal pathology.
- Examination of retinal cell plasticity, including retinal pigment epithelial (RPE) cells and myeloid populations (microglia, macrophages).
Main Results:
- Chronic inflammation, driven by adaptive immunity and complement activation, replaces immune quiescence in aging retinas.
- Proinflammatory cytokines (IL-17, IL-22) secreted by T-cells contribute to retinal injury.
- Dysfunctional complement regulation, particularly involving apolipoprotein E (APOE) ε4, exacerbates pathology.
- Heterogeneous myeloid populations and sex-specific immune aging further modify disease progression.
Conclusions:
- Adaptive immunity transitions from protective surveillance to pathological inflammation in age-related retinal degeneration.
- The complement system and immune cell plasticity are critical drivers of retinal disease progression.
- Understanding these immune shifts offers potential therapeutic targets for AMD and other age-related retinal conditions.
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