May 18th, 2026
Microglia are innate immune cells of the central nervous system, analogous to macrophages elsewhere in the body. Overly reactive and senescent microglia are implicated in the development of neurodegenerative conditions, producing sustained inflammatory signaling while failing in their normal portfolio of tasks related to tissue maintenance and support of neurons. Here, researchers extend this line of thought to the aging of the retina and the progressive blindness of macular degeneration. To what degree are microglia a contributing cause of pathology in retinal degeneration? It is hoped that future strategies developed to address microglial dysfunction in the context of conditions such as Alzheimer's disease may have broader application.
Age-related macular degeneration (AMD) is a leading cause of irreversible central vision loss in older adults. Advanced AMD comprises an atrophic ("dry") form characterized by retinal pigment epithelium (RPE) and photoreceptor degeneration and a neovascular ("wet") form driven by choroidal neovascularization (CNV). Beyond genetic predisposition and environmental stressors, chronic dysregulation of innate immunity is increasingly recognized as a convergent mechanism linking drusen/Bruch's membrane alterations to outer retinal cell death and pathological angiogenesis.
