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Updated: Aug 26, 2025
Isolation and Culture of Primary Retinal Müller Cells from Sprague-Dawley (SD) Rats
Published on: June 17, 2025
Müller cell degeneration and microglial dysfunction in the Alzheimer's retina
Qinyuan Alis Xu1,2, Pierre Boerkoel1, Veronica Hirsch-Reinshagen3
1MD Undergraduate Program, University of British Columbia, Vancouver, BC, Canada.
Abstract:
Amyloid beta (Aβ) deposits in the retina of the Alzheimer's disease (AD) eye may provide a useful diagnostic biomarker for AD. This study focused on the relationship of Aβ with macroglia and microglia, as these glial cells are hypothesized to play important roles in homeostasis and clearance of Aβ in the AD retina. Significantly higher Aβ load was found in AD compared to controls, and specifically in the mid-peripheral region. AD retina showed significantly less immunoreactivity against glial fibrillary acidic protein (GFAP) and glutamine synthetase (GS) compared to control eyes. Immunoreactivity against ionized calcium binding adapter molecule-1 (IBA-1), a microglial marker, demonstrated a higher level of microgliosis in AD compared to control retina. Within AD retina, more IBA-1 immunoreactivity was present in the mid-peripheral retina, which contained more Aβ than the central AD retina. GFAP co-localized rarely with Aβ, while IBA-1 co-localized with Aβ in more layers of control than AD donor retina. These results suggest that dysfunction of the Müller and microglial cells may be key features of the AD retina.
Insights
Alzheimer's disease (AD) retinal amyloid beta (Aβ) deposits may diagnose AD. AD retinas show altered glial cells (Müller and microglia), suggesting their dysfunction is key in AD.
Area of Science:
- Neuroscience
- Ophthalmology
- Pathology
Background:
- Amyloid beta (Aβ) accumulation in the Alzheimer's disease (AD) retina is a potential diagnostic biomarker.
- Glial cells, including macroglia (Müller cells) and microglia, are implicated in retinal Aβ homeostasis and clearance in AD.
Purpose of the Study:
- To investigate the relationship between Aβ deposits and glial cell markers (GFAP, GS, IBA-1) in the retinas of AD patients and controls.
- To determine the distribution and co-localization of Aβ with glial cells in the AD retina.
Main Methods:
- Immunohistochemical analysis of retinal tissue from AD and control donors.
- Quantification of Aβ load and immunoreactivity for glial fibrillary acidic protein (GFAP), glutamine synthetase (GS), and ionized calcium binding adapter molecule-1 (IBA-1).
- Assessment of co-localization between Aβ and glial markers.
Main Results:
- Significantly higher Aβ load was observed in AD retinas, particularly in the mid-peripheral region, compared to controls.
- AD retinas exhibited reduced GFAP and GS immunoreactivity but increased microgliosis (IBA-1 immunoreactivity) compared to controls.
- Increased IBA-1 immunoreactivity in the AD mid-peripheral retina correlated with higher Aβ load; Aβ co-localization with IBA-1 was reduced in AD retinas.
Conclusions:
- Dysfunctional Müller cells and microglia are characteristic features of the Alzheimer's disease retina.
- Retinal Aβ deposition patterns and associated glial responses may offer insights into AD pathogenesis and diagnostics.
