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The process of subretinal strand formation
M Okada1, N Ogino, M Matsumura
1Department of Ophthalmology, Faculty of Medicine, Kyoto University, Japan.
Abstract:
Surgically resected subretinal proliferative tissue (SRP) in proliferative vitreoretinopathy was examined by morphological and immunohistochemical methods. Membranous and strand-like SRPs were observed. Membranous SRP (4 cases) consisted of retinal pigment epithelial cells (RPEs) and a thin layer of extracellular materials. Strand-like SRP (14 cases) had a core, in which the proliferated cells were embedded among extracellular materials. RPEs and glial cells were found on the surface of the core. Immunohistochemical investigation revealed that the predominant cell components of the strand-like SRPs were RPEs and Müller cells, whereas membranous SRPs were composed mainly of RPEs. It was found that the majority of membranous and strand-like SRPs contained types I, III and IV collagens and fibronectin in the extracellular space. Based on the results of this study, a hypothetical process for the formation of SRP tissues was proposed.
Insights
Subretinal proliferative tissue (SRP) in proliferative vitreoretinopathy differs morphologically. Strand-like SRPs contain RPEs and Müller cells, while membranous SRPs are mainly RPEs, both featuring extracellular matrix components.
Area of Science:
- Ophthalmology
- Cell Biology
- Extracellular Matrix Research
Background:
- Proliferative vitreoretinopathy (PVP) is a severe complication of retinal detachment.
- Subretinal proliferative tissue (SRP) plays a critical role in the pathogenesis of PVP.
- Understanding the cellular and extracellular composition of SRP is crucial for developing targeted therapies.
Purpose of the Study:
- To characterize the morphological and immunohistochemical features of surgically resected subretinal proliferative tissue (SRP) in patients with proliferative vitreoretinopathy.
- To differentiate between membranous and strand-like SRP based on cellular composition and extracellular matrix components.
- To propose a hypothetical process for SRP formation.
Main Methods:
- Morphological examination of surgically resected SRP samples.
- Immunohistochemical analysis to identify cell types (RPEs, glial cells, Müller cells) and extracellular matrix proteins (collagens, fibronectin).
- Comparison of cellular and extracellular components between membranous and strand-like SRP.
Main Results:
- Two distinct forms of SRP were identified: membranous and strand-like.
- Membranous SRP primarily consisted of retinal pigment epithelial cells (RPEs).
- Strand-like SRP contained RPEs and Müller cells within a core of extracellular materials, with glial cells on the surface.
- Both SRP types showed the presence of types I, III, and IV collagens and fibronectin in the extracellular space.
Conclusions:
- SRP in proliferative vitreoretinopathy exhibits distinct morphological subtypes with differential cellular compositions.
- RPEs are a common component, with Müller cells being more prevalent in strand-like SRP.
- The extracellular matrix, rich in collagens and fibronectin, is a significant component of both SRP forms.
- These findings contribute to a hypothetical model of SRP formation in PVP.