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Hyperconvolution of the inner limiting membrane in vitreomaculopathies
D R J Snead1, N Cullen, S James
1Department of Pathology, University Hospitals of Coventry and Warwickshire NHS Trust, CV2 2DX, Coventry, UK. david.snead@uhcw.nhs.uk
Summary
Glial cells are key in epiretinal membrane (ERM) formation across various vitreomaculopathies. Distinctive ILM changes in cellophane maculopathy and macular pucker suggest localized origins for these ERMs.
Area of Science:
- Ophthalmology
- Cell Biology
- Pathology
Background:
- Investigates epiretinal membranes (ERMs) in four distinct vitreomaculopathies.
- Proposes a hypothesis on the origin and role of the predominant cell type in ERM formation.
Purpose of the Study:
- To compare and contrast ERMs in macular pucker (MP), cellophane maculopathy (CM), stage 4 macular hole (MH), and vitreomacular traction syndrome (VMT).
- To elucidate the cellular origins and pathomechanisms of ERMs in these conditions.
Main Methods:
- Surgically removed ERMs from 38 patients underwent light microscopy and immunocytochemistry (ICC).
- Antibodies used included GFAP, type IV collagen, type II collagen, and cytokeratins.
- Specimens were compared to post-mortem control eyes with and without posterior vitreous detachment (PVD).
Main Results:
- All ERM specimens showed GFAP-positive glial cells on the inner limiting membrane (ILM).
- MP and CM exhibited ILM hyperconvolution, increased glial density, and ILM basement membrane duplication.
- Three MP cases contained cytokeratin-positive cells, suggesting retinal pigment epithelium (RPE) origin.
Conclusions:
- Glial cells are fundamentally important in ERM formation across the studied vitreomaculopathies.
- ILM hyperconvolution and duplication in CM and MP indicate a tractional mechanism originating from the ILM.
- ERMs in MP may also involve cytokeratin-positive cells of RPE origin.