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An electron microscopic study of macrophages in rats with inherited retinal dystrophy
Abstract:
In retinas of rats (RCS) with inherited retinal dystrophy, cells interpreted as macrophages infiltrate the outer nuclear layer and subsequently appear in the interphotoreceptor space, where they accummulate during the course of the disease. The morphology and distribution of these cells and their relations to the pigment epithelial cells were investigated. Macrophages, regardless of their location, possessed morphological features that distinguished them from the pigment epithelial cells. Premelanosomes and melanosomes, typical of pigment epithelial cells, were never observed in macrophages. There was no evidence to indicate that, during the period studied, the pigment epithelial cells had become dedifferentiated or had migrated from Bruch's membrane. Macrophages, like pigment epithelial cells, phagocytized little or no outer segment material. The findings indicate that, at least during the interval studied, the cells that infiltrate the retina and interphotoreceptor space are macrophages rather than pigment epithelial cells.
Insights
In rats with inherited retinal dystrophy, infiltrating cells in the retina are identified as macrophages, not pigment epithelial cells. This finding clarifies cell identity in retinal degeneration research.
Area of Science:
- Ophthalmology
- Cell Biology
- Genetics
Background:
- Inherited retinal dystrophy (RCS) involves retinal degeneration.
- Cellular infiltration of the retina is a characteristic feature of RCS.
Purpose of the Study:
- To investigate the identity and characteristics of cells infiltrating the retina in RCS rats.
- To differentiate between macrophages and pigment epithelial cells in the context of retinal dystrophy.
Main Methods:
- Morphological analysis of infiltrating cells in the outer nuclear layer and interphotoreceptor space.
- Comparison of cellular features with known pigment epithelial cells.
- Investigation of premelanosome and melanosome presence.
Main Results:
- Infiltrating cells exhibited distinct morphological features differentiating them from pigment epithelial cells.
- Premelanosomes and melanosomes were absent in infiltrating cells.
- Pigment epithelial cells did not show dedifferentiation or migration.
Conclusions:
- The cells infiltrating the retina and interphotoreceptor space in RCS rats are macrophages.
- This distinction is crucial for understanding the pathogenesis of inherited retinal dystrophy.