May 1994
Volume 35, Issue 6
Free
Articles  |   May 1994
Apoptosis leads to photoreceptor degeneration in inherited retinal dystrophy of RCS rats.
Author Affiliations
  • M O Tso
    Department of Ophthalmology and Visual Sciences, UIC Eye Center, University of Illinois at Chicago College of Medicine 60612.
  • C Zhang
    Department of Ophthalmology and Visual Sciences, UIC Eye Center, University of Illinois at Chicago College of Medicine 60612.
  • A S Abler
    Department of Ophthalmology and Visual Sciences, UIC Eye Center, University of Illinois at Chicago College of Medicine 60612.
  • C J Chang
    Department of Ophthalmology and Visual Sciences, UIC Eye Center, University of Illinois at Chicago College of Medicine 60612.
  • F Wong
    Department of Ophthalmology and Visual Sciences, UIC Eye Center, University of Illinois at Chicago College of Medicine 60612.
  • G Q Chang
    Department of Ophthalmology and Visual Sciences, UIC Eye Center, University of Illinois at Chicago College of Medicine 60612.
  • T T Lam
    Department of Ophthalmology and Visual Sciences, UIC Eye Center, University of Illinois at Chicago College of Medicine 60612.
Investigative Ophthalmology & Visual Science May 1994, Vol.35, 2693-2699. doi:
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    • Get Citation

      M O Tso, C Zhang, A S Abler, C J Chang, F Wong, G Q Chang, T T Lam; Apoptosis leads to photoreceptor degeneration in inherited retinal dystrophy of RCS rats.. Invest. Ophthalmol. Vis. Sci. 1994;35(6):2693-2699.

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

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Abstract

PURPOSE: To determine the pathogenetic mechanism of photoreceptor cell degeneration in the inherited retinal dystrophy in Royal College of Surgeons (RCS) rats. METHODS: The dystrophic retinas of the pink-eyed RCS (RCS-rdy-p) rats were examined for DNA fragmentation by agarose gel electrophoresis of retinal DNA and by TdT-mediated biotin-dUDP nick-end labeling (TUNEL) in paraffin sections. Rats ranging in age from 3 to 60 days were examined. RESULTS: Agarose gel electrophoresis of retinal DNA isolated from animals 25, 30, 35, and 40 days old showed a ladder pattern of degradation with bands corresponding to multiples of 180 to 200 base pair subunits. TUNEL study showed increasing labeling of photoreceptor cells with progression of the retinal dystrophy of the RCS rats. CONCLUSIONS: Apoptosis is the dominant mechanism of photoreceptor degeneration in the RCS rat, which has a genetic defect in the phagocytic activity of retinal pigment epithelium. The onset of the degeneration appeared to vary between rod cells in the different regions of the eye.

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