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Localisation of opticin in human proliferative retinal disease
D M Pattwell1, C M Sheridan, M Le Goff
1Unit of Ophthalmology, School of Clinical Sciences, University of Liverpool and St Paul's Eye Unit, Royal Liverpool University Hospital, Liverpool L69 3GA, UK.
Experimental Eye Research
|December 29, 2009
Summary
Opticin, a protein from the ciliary body epithelium, is found in pathological eye tissues like epiretinal membranes. It co-localizes with vitreous collagen, suggesting a role in proliferative retinopathies.
Area of Science:
- Ophthalmology
- Extracellular Matrix Biology
- Retinal Disease Pathogenesis
Background:
- Opticin is an extracellular matrix protein secreted by the non-pigmented ciliary body epithelium (CBE).
- Its distribution in pathological ocular tissues is not well understood.
Purpose of the Study:
- To determine the distribution of opticin in pathological eye tissues from patients with proliferative retinopathies.
- To investigate the relationship between opticin, vitreous collagen, and neovascularization in these conditions.
Main Methods:
- Immunohistochemistry was used to analyze opticin, type II collagen (vitreous marker), and endothelial markers (CD31, CD34) in enucleated eyes and excised membranes.
- Tissues were from patients with proliferative diabetic retinopathy (PDR), central retinal vein occlusion (CRVO), and proliferative vitreoretinopathy (PVR).
Main Results:
- Opticin was detected at the basal surface and within CBE cells of all analyzed globes.
- Opticin co-localized with vitreous type II collagen in some cases.
- Opticin was present in 16 of 19 posterior hyaloid/epiretinal membranes, showing layered, diffuse, or focal patterns.
- Layered opticin co-localized with type II collagen, while other patterns did not.
Conclusions:
- The ciliary body epithelium continues to express and secrete opticin even in advanced proliferative retinal diseases.
- Opticin is co-distributed with vitreous type II collagen and found in pre-retinal membranes.
- Opticin may play a role in the development of proliferative retinopathies.
