October 1993
Volume 34, Issue 11
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Articles  |   October 1993
Structural changes of the interphotoreceptor matrix in an inherited retinal degeneration: a lectin cytochemical study of progressive rod-cone degeneration.
Author Affiliations
  • K Mieziewska
    Section of Medical Genetics, School of Veterinary Medicine, University of Pennsylvania, Philadelphia.
  • T van Veen
    Section of Medical Genetics, School of Veterinary Medicine, University of Pennsylvania, Philadelphia.
  • G D Aguirre
    Section of Medical Genetics, School of Veterinary Medicine, University of Pennsylvania, Philadelphia.
Investigative Ophthalmology & Visual Science October 1993, Vol.34, 3056-3067. doi:
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    • Get Citation

      K Mieziewska, T van Veen, G D Aguirre; Structural changes of the interphotoreceptor matrix in an inherited retinal degeneration: a lectin cytochemical study of progressive rod-cone degeneration.. Invest. Ophthalmol. Vis. Sci. 1993;34(11):3056-3067.

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      © ARVO (1962-2015); The Authors (2016-present)

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Abstract

PURPOSE: In the retinal disorder progressive rod-cone degeneration (prcd) in miniature poodle dogs, the photoreceptor layer degenerates slowly in the course of 5 to 7 years. Components of the interphotoreceptor matrix form a continuous extracellular lattice around photoreceptors. The purpose was to study the photoreceptor cell-matrix interactions during the disease and degeneration phases. Because degeneration rate was slower in cones, the authors also wanted to investigate whether there was a link between the degeneration and the photoreceptor-specific interphotoreceptor matrix domains. METHODS: Rod- and cone-specific interphotoreceptor matrix domains were examined during two periods: before morphological signs of disease had appeared and during the degenerative stages. Two lectin probes were used; wheat germ agglutinin and peanut agglutinin. By their affinity for terminal carbohydrates, the lectins visually separated the two photoreceptor-specific domains and allowed follow-up of the fate of the rod and cone matrices separately. RESULTS: Before and during the course of disease, the lectin distribution in rod and cone domains remained normal, however, in the degenerative phase of the disease, there were structural changes in the matrix domains. The matrix connections between the individual domains was disrupted and single domains were formed. Cone domains and, to a lesser degree rod domains, were thickened around the inner and outer segments. CONCLUSIONS: The changes occurring in the photoreceptor-specific domains were indicative of structural adaptation to cell death and to degenerative conditions. There was no evidence of an active involvement of the interphotoreceptor matrix components studied in the disease process.

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